snapshot of https://github.com/flutter/samples.git (main, 2026-09-16; blobs > 131072B omitted)

platform_design/.gitignore

@@ -0,0 +1,71 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# Visual Studio Code related
+.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/Flutter/flutter_export_environment.sh
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

platform_design/.metadata

@@ -0,0 +1,36 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "db7ef5bf9f59442b0e200a90587e8fa5e0c6336a"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+    - platform: android
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+    - platform: ios
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+    - platform: web
+      create_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+      base_revision: db7ef5bf9f59442b0e200a90587e8fa5e0c6336a
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

platform_design/README.md

@@ -0,0 +1,104 @@
+# Platform Design
+
+Instead of transliterating widgets one by one between Cupertino and Material,
+Android and iOS apps often follow different information architecture patterns
+that require some design decisions.
+
+This sample project shows a Flutter app that maximizes application code reuse
+while adhering to different design patterns on Android and iOS. On
+Android, it uses Material's [lateral navigation](https://material.io/design/navigation/understanding-navigation.html#types-of-navigation)
+based on a drawer and on iOS, it adheres to Apple Human Interface Guideline's
+[flat navigation](https://developer.apple.com/design/human-interface-guidelines/ios/app-architecture/navigation/)
+by using a bottom tab bar.
+
+Visually, the app presents platform-agnostic content surrounded by
+platform-specific 'chrome'.
+
+# Preview
+
+![App's platform toggling preview](adaptive-overview.gif)
+
+See https://youtu.be/svhbbFZg1IA for a longer non-gif format.
+
+# Features
+
+## Home
+
+Defines the top level navigation structure of the app and shows the contents
+of the songs tab on launch.
+
+### Android
+
+* Uses the drawer paradigm on the root page.
+
+### iOS
+
+* Uses bottom tab bars with parallel navigation stacks.
+
+## Songs feed tab
+
+Shows platform-agnostic cards that is tappable and that performs a hero
+transition on top of the platform native page transitions.
+
+Both platforms also show a button in their app/nav bar to toggle the platform.
+
+### Android
+
+* Android uses a static pull-to-refresh pattern with an additional refresh
+button in the app bar.
+* The song details page must be popped in order to change tabs on Android.
+
+### iOS
+
+* The iOS songs tab uses a scrollable iOS 11 large title style navigation bar.
+* iOS uses an overscrolling pull-to-refresh pattern.
+* On iOS, parallel tabs are always accessible and the songs tab's navigation
+stack is preserved when changing tabs.
+
+## News Tab
+
+Shows platform-agnostic news boxes.
+
+### Android
+
+* The news tab always appears on top of the songs tab when summoned from the
+drawer.
+
+### iOS
+
+* The news tab appears instead of the songs tab on iOS when switching tabs from
+the tab bar.
+
+## Profile Tab
+
+Shows a number of user preferences.
+
+### Android
+
+* The profile tab appears on top of the songs tab on Android.
+* Has tappable preference cards which shows a multiple-choice dialog on Android.
+* The log out button shows a 2 button dialog on Android.
+
+### iOS
+
+* The profile tab appears instead of the songs tab on iOS.
+* Has tappable preference cards which shows a picker on iOS.
+* The log out button shows a 3 choice action sheet on iOS.
+
+## Settings Tab
+
+Shows a number of app settings via Material switches which auto adapt to the
+platform.
+
+### Android
+
+* The settings is directly available in the drawer on Android since a Material
+Design drawer can fit many tabs.
+
+### iOS
+
+* The settings is accessible from a button inside the profile tab's nav bar on
+iOS. This is a common pattern since there are conventionally more items in the
+drawer than there are tabs.
+* On iOS, the settings page is shown as a full screen dialog instead of a tab
+in the tab scaffold.

platform_design/analysis_options.yaml

@@ -0,0 +1 @@
+include: ../analysis_options.yaml

platform_design/android/.gitignore

@@ -0,0 +1,13 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks

platform_design/android/app/build.gradle

@@ -0,0 +1,67 @@
+plugins {
+    id "com.android.application"
+    id "kotlin-android"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+android {
+    namespace "dev.flutter.platform_design"
+    compileSdkVersion flutter.compileSdkVersion
+    ndkVersion flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "dev.flutter.platform_design"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {}

platform_design/android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

platform_design/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,33 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:label="platform_design"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

platform_design/android/app/src/main/kotlin/dev/flutter/platform_design/MainActivity.kt

@@ -0,0 +1,6 @@
+package dev.flutter.platform_design
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+}

platform_design/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

platform_design/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

platform_design/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

platform_design/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

platform_design/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

platform_design/android/build.gradle

@@ -0,0 +1,30 @@
+buildscript {
+    ext.kotlin_version = '1.7.10'
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+tasks.register("clean", Delete) {
+    delete rootProject.buildDir
+}

platform_design/android/gradle.properties

@@ -0,0 +1,3 @@
+org.gradle.jvmargs=-Xmx4G
+android.useAndroidX=true
+android.enableJetifier=true

platform_design/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip

platform_design/android/settings.gradle

@@ -0,0 +1,29 @@
+pluginManagement {
+    def flutterSdkPath = {
+        def properties = new Properties()
+        file("local.properties").withInputStream { properties.load(it) }
+        def flutterSdkPath = properties.getProperty("flutter.sdk")
+        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+        return flutterSdkPath
+    }
+    settings.ext.flutterSdkPath = flutterSdkPath()
+
+    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+
+    plugins {
+        id "dev.flutter.flutter-gradle-plugin" version "1.0.0" apply false
+    }
+}
+
+plugins {
+    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+    id "com.android.application" version "7.3.0" apply false
+}
+
+include ":app"

platform_design/codelab_rebuild.yaml

@@ -0,0 +1,29 @@
+# Run with tooling from https://github.com/flutter/codelabs/tree/main/tooling/codelab_rebuild
+name: Platform Design rebuild script
+steps:
+  - name: Remove runner
+    rmdirs:
+      - android
+      - ios
+      - web
+  - name: Flutter recreate runner
+    flutter: create --platform android,ios,web --org dev.flutter .
+  - name: Patch web/manifest.json
+    path: web/manifest.json
+    patch-u: |
+      --- b/platform_design/web/manifest.json
+      +++ a/platform_design/web/manifest.json
+      @@ -5,7 +5,7 @@
+           "display": "standalone",
+           "background_color": "#0175C2",
+           "theme_color": "#0175C2",
+      -    "description": "A new Flutter project.",
+      +    "description": "A project showcasing a Flutter app following different platform IA conventions.",
+           "orientation": "portrait-primary",
+           "prefer_related_applications": false,
+           "icons": [
+  - name: Update dependencies
+    flutter: pub upgrade --major-versions
+  - name: Build for iOS
+    platforms: [ macos ]
+    flutter: build ios --simulator

platform_design/ios/.gitignore

@@ -0,0 +1,34 @@
+**/dgph
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

platform_design/ios/Flutter/AppFrameworkInfo.plist

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>11.0</string>
+</dict>
+</plist>

platform_design/ios/Flutter/Debug.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

platform_design/ios/Flutter/Release.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

platform_design/ios/Runner.xcodeproj/project.pbxproj

@@ -0,0 +1,614 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 54;
+	objects = {
+
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+/* End PBXBuildFile section */
+
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+			containerPortal = 97C146E61CF9000F007C117D /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 97C146ED1CF9000F007C117D;
+			remoteInfo = Runner;
+		};
+/* End PBXContainerItemProxy section */
+
+/* Begin PBXCopyFilesBuildPhase section */
+		9705A1C41CF9048500538489 /* Embed Frameworks */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+			);
+			name = "Embed Frameworks";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
+		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
+		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
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+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		97C147061CF9000F007C117D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 9740EEB21CF90195004384FC /* Debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.platformDesign;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Debug;
+		};
+		97C147071CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.platformDesign;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		331C8087294A63A400263BE5 /* Build configuration list for PBXNativeTarget "RunnerTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				331C8088294A63A400263BE5 /* Debug */,
+				331C8089294A63A400263BE5 /* Release */,
+				331C808A294A63A400263BE5 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147031CF9000F007C117D /* Debug */,
+				97C147041CF9000F007C117D /* Release */,
+				249021D3217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147061CF9000F007C117D /* Debug */,
+				97C147071CF9000F007C117D /* Release */,
+				249021D4217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 97C146E61CF9000F007C117D /* Project object */;
+}

platform_design/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

platform_design/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

platform_design/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

platform_design/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -0,0 +1,98 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1430"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "331C8080294A63A400263BE5"
+               BuildableName = "RunnerTests.xctest"
+               BlueprintName = "RunnerTests"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

platform_design/ios/Runner.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

platform_design/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

platform_design/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

platform_design/ios/Runner/AppDelegate.swift

@@ -0,0 +1,13 @@
+import UIKit
+import Flutter
+
+@UIApplicationMain
+@objc class AppDelegate: FlutterAppDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    GeneratedPluginRegistrant.register(with: self)
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+}

platform_design/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,122 @@
+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

platform_design/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

platform_design/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

@@ -0,0 +1,5 @@
+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.

platform_design/ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

platform_design/ios/Runner/Base.lproj/Main.storyboard

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

platform_design/ios/Runner/Info.plist

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>Platform Design</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>platform_design</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+</dict>
+</plist>

platform_design/ios/Runner/Runner-Bridging-Header.h

@@ -0,0 +1 @@
+#import "GeneratedPluginRegistrant.h"

platform_design/ios/RunnerTests/RunnerTests.swift

@@ -0,0 +1,12 @@
+import Flutter
+import UIKit
+import XCTest
+
+class RunnerTests: XCTestCase {
+
+  func testExample() {
+    // If you add code to the Runner application, consider adding tests here.
+    // See https://developer.apple.com/documentation/xctest for more information about using XCTest.
+  }
+
+}

platform_design/lib/main.dart

@@ -0,0 +1,202 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+import 'news_tab.dart';
+import 'profile_tab.dart';
+import 'settings_tab.dart';
+import 'songs_tab.dart';
+import 'widgets.dart';
+
+void main() => runApp(const MyAdaptingApp());
+
+class MyAdaptingApp extends StatelessWidget {
+  const MyAdaptingApp({super.key});
+
+  @override
+  Widget build(context) {
+    // Either Material or Cupertino widgets work in either Material or Cupertino
+    // Apps.
+    return MaterialApp(
+      title: 'Adaptive Music App',
+      theme: ThemeData(
+        // Use the green theme for Material widgets.
+        primarySwatch: Colors.green,
+      ),
+      darkTheme: ThemeData.dark(),
+      builder: (context, child) {
+        return CupertinoTheme(
+          // Instead of letting Cupertino widgets auto-adapt to the Material
+          // theme (which is green), this app will use a different theme
+          // for Cupertino (which is blue by default).
+          data: const CupertinoThemeData(),
+          child: Material(child: child),
+        );
+      },
+      home: const PlatformAdaptingHomePage(),
+    );
+  }
+}
+
+// Shows a different type of scaffold depending on the platform.
+//
+// This file has the most amount of non-sharable code since it behaves the most
+// differently between the platforms.
+//
+// These differences are also subjective and have more than one 'right' answer
+// depending on the app and content.
+class PlatformAdaptingHomePage extends StatefulWidget {
+  const PlatformAdaptingHomePage({super.key});
+
+  @override
+  State<PlatformAdaptingHomePage> createState() =>
+      _PlatformAdaptingHomePageState();
+}
+
+class _PlatformAdaptingHomePageState extends State<PlatformAdaptingHomePage> {
+  // This app keeps a global key for the songs tab because it owns a bunch of
+  // data. Since changing platform re-parents those tabs into different
+  // scaffolds, keeping a global key to it lets this app keep that tab's data as
+  // the platform toggles.
+  //
+  // This isn't needed for apps that doesn't toggle platforms while running.
+  final songsTabKey = GlobalKey();
+
+  // In Material, this app uses the hamburger menu paradigm and flatly lists
+  // all 4 possible tabs. This drawer is injected into the songs tab which is
+  // actually building the scaffold around the drawer.
+  Widget _buildAndroidHomePage(BuildContext context) {
+    return SongsTab(key: songsTabKey, androidDrawer: _AndroidDrawer());
+  }
+
+  // On iOS, the app uses a bottom tab paradigm. Here, each tab view sits inside
+  // a tab in the tab scaffold. The tab scaffold also positions the tab bar
+  // in a row at the bottom.
+  //
+  // An important thing to note is that while a Material Drawer can display a
+  // large number of items, a tab bar cannot. To illustrate one way of adjusting
+  // for this, the app folds its fourth tab (the settings page) into the
+  // third tab. This is a common pattern on iOS.
+  Widget _buildIosHomePage(BuildContext context) {
+    return CupertinoTabScaffold(
+      tabBar: CupertinoTabBar(
+        items: const [
+          BottomNavigationBarItem(
+            label: SongsTab.title,
+            icon: SongsTab.iosIcon,
+          ),
+          BottomNavigationBarItem(
+            label: NewsTab.title,
+            icon: NewsTab.iosIcon,
+          ),
+          BottomNavigationBarItem(
+            label: ProfileTab.title,
+            icon: ProfileTab.iosIcon,
+          ),
+        ],
+      ),
+      tabBuilder: (context, index) {
+        assert(index <= 2 && index >= 0, 'Unexpected tab index: $index');
+        return switch (index) {
+          0 => CupertinoTabView(
+            defaultTitle: SongsTab.title,
+            builder: (context) => SongsTab(key: songsTabKey),
+          ),
+          1 => CupertinoTabView(
+            defaultTitle: NewsTab.title,
+            builder: (context) => const NewsTab(),
+          ),
+          2 => CupertinoTabView(
+            defaultTitle: ProfileTab.title,
+            builder: (context) => const ProfileTab(),
+          ),
+          _ => const SizedBox.shrink(),
+        };
+      },
+    );
+  }
+
+  @override
+  Widget build(context) {
+    return PlatformWidget(
+      androidBuilder: _buildAndroidHomePage,
+      iosBuilder: _buildIosHomePage,
+    );
+  }
+}
+
+class _AndroidDrawer extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Drawer(
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          DrawerHeader(
+            decoration: const BoxDecoration(color: Colors.green),
+            child: Padding(
+              padding: const EdgeInsets.only(bottom: 20),
+              child: Icon(
+                Icons.account_circle,
+                color: Colors.green.shade800,
+                size: 96,
+              ),
+            ),
+          ),
+          ListTile(
+            leading: SongsTab.androidIcon,
+            title: const Text(SongsTab.title),
+            onTap: () {
+              Navigator.pop(context);
+            },
+          ),
+          ListTile(
+            leading: NewsTab.androidIcon,
+            title: const Text(NewsTab.title),
+            onTap: () {
+              Navigator.pop(context);
+              Navigator.push<void>(
+                context,
+                MaterialPageRoute(builder: (context) => const NewsTab()),
+              );
+            },
+          ),
+          ListTile(
+            leading: ProfileTab.androidIcon,
+            title: const Text(ProfileTab.title),
+            onTap: () {
+              Navigator.pop(context);
+              Navigator.push<void>(
+                context,
+                MaterialPageRoute(
+                  builder: (context) => const ProfileTab(),
+                ),
+              );
+            },
+          ),
+          // Long drawer contents are often segmented.
+          const Padding(
+            padding: EdgeInsets.symmetric(horizontal: 16),
+            child: Divider(),
+          ),
+          ListTile(
+            leading: SettingsTab.androidIcon,
+            title: const Text(SettingsTab.title),
+            onTap: () {
+              Navigator.pop(context);
+              Navigator.push<void>(
+                context,
+                MaterialPageRoute(
+                  builder: (context) => const SettingsTab(),
+                ),
+              );
+            },
+          ),
+        ],
+      ),
+    );
+  }
+}

platform_design/lib/news_tab.dart

@@ -0,0 +1,127 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_lorem/flutter_lorem.dart';
+
+import 'utils.dart';
+import 'widgets.dart';
+
+class NewsTab extends StatefulWidget {
+  static const title = 'News';
+  static const androidIcon = Icon(Icons.library_books);
+  static const iosIcon = Icon(CupertinoIcons.news);
+
+  const NewsTab({super.key});
+
+  @override
+  State<NewsTab> createState() => _NewsTabState();
+}
+
+class _NewsTabState extends State<NewsTab> {
+  static const _itemsLength = 20;
+
+  late final List<Color> colors;
+  late final List<String> titles;
+  late final List<String> contents;
+
+  @override
+  void initState() {
+    colors = getRandomColors(_itemsLength);
+    titles = List.generate(
+      _itemsLength,
+      (index) => generateRandomHeadline(),
+    );
+    contents = List.generate(
+      _itemsLength,
+      (index) => lorem(paragraphs: 1, words: 24),
+    );
+    super.initState();
+  }
+
+  Widget _listBuilder(BuildContext context, int index) {
+    return SafeArea(
+      top: false,
+      bottom: false,
+      child: Card(
+        elevation: 1.5,
+        margin: const EdgeInsets.fromLTRB(6, 12, 6, 0),
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(4),
+        ),
+        child: InkWell(
+          // Make it splash on Android. It would happen automatically if this
+          // was a real card but this is just a demo. Skip the splash on iOS.
+          onTap: defaultTargetPlatform == TargetPlatform.iOS ? null : () {},
+          child: Padding(
+            padding: const EdgeInsets.all(12.0),
+            child: Row(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                CircleAvatar(
+                  backgroundColor: colors[index],
+                  child: Text(
+                    titles[index].substring(0, 1),
+                    style: const TextStyle(color: Colors.white),
+                  ),
+                ),
+                const Padding(padding: EdgeInsets.only(left: 16)),
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        titles[index],
+                        style: const TextStyle(
+                          fontSize: 15,
+                          fontWeight: FontWeight.w500,
+                        ),
+                      ),
+                      const Padding(padding: EdgeInsets.only(top: 8)),
+                      Text(contents[index]),
+                    ],
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  // ===========================================================================
+  // Non-shared code below because this tab uses different scaffolds.
+  // ===========================================================================
+
+  Widget _buildAndroid(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text(NewsTab.title)),
+      body: ListView.builder(
+        itemCount: _itemsLength,
+        itemBuilder: _listBuilder,
+      ),
+    );
+  }
+
+  Widget _buildIos(BuildContext context) {
+    return CupertinoPageScaffold(
+      navigationBar: const CupertinoNavigationBar(),
+      child: ListView.builder(
+        itemCount: _itemsLength,
+        itemBuilder: _listBuilder,
+      ),
+    );
+  }
+
+  @override
+  Widget build(context) {
+    return PlatformWidget(
+      androidBuilder: _buildAndroid,
+      iosBuilder: _buildIos,
+    );
+  }
+}

platform_design/lib/profile_tab.dart

@@ -0,0 +1,254 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+import 'settings_tab.dart';
+import 'widgets.dart';
+
+class ProfileTab extends StatelessWidget {
+  static const title = 'Profile';
+  static const androidIcon = Icon(Icons.person);
+  static const iosIcon = Icon(CupertinoIcons.profile_circled);
+
+  const ProfileTab({super.key});
+
+  Widget _buildBody(BuildContext context) {
+    return SafeArea(
+      child: Padding(
+        padding: const EdgeInsets.all(24.0),
+        child: Column(
+          children: [
+            const Padding(
+              padding: EdgeInsets.all(8),
+              child: Center(
+                child: Text(
+                  '😼',
+                  style: TextStyle(
+                    fontSize: 80,
+                    decoration: TextDecoration.none,
+                  ),
+                ),
+              ),
+            ),
+            const PreferenceCard(
+              header: 'MY INTENSITY PREFERENCE',
+              content: '🔥',
+              preferenceChoices: [
+                'Super heavy',
+                'Dial it to 11',
+                "Head bangin'",
+                '1000W',
+                'My neighbor hates me',
+              ],
+            ),
+            const PreferenceCard(
+              header: 'CURRENT MOOD',
+              content: '🤘🏾🚀',
+              preferenceChoices: [
+                'Over the moon',
+                'Basking in sunlight',
+                'Hello fellow Martians',
+                'Into the darkness',
+              ],
+            ),
+            Expanded(child: Container()),
+            const LogOutButton(),
+          ],
+        ),
+      ),
+    );
+  }
+
+  // ===========================================================================
+  // Non-shared code below because on iOS, the settings tab is nested inside of
+  // the profile tab as a button in the nav bar.
+  // ===========================================================================
+
+  Widget _buildAndroid(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text(title)),
+      body: _buildBody(context),
+    );
+  }
+
+  Widget _buildIos(BuildContext context) {
+    return CupertinoPageScaffold(
+      navigationBar: CupertinoNavigationBar(
+        trailing: CupertinoButton(
+          padding: EdgeInsets.zero,
+          child: SettingsTab.iosIcon,
+          onPressed: () {
+            // This pushes the settings page as a full page modal dialog on top
+            // of the tab bar and everything.
+            Navigator.of(context, rootNavigator: true).push<void>(
+              CupertinoPageRoute(
+                title: SettingsTab.title,
+                fullscreenDialog: true,
+                builder: (context) => const SettingsTab(),
+              ),
+            );
+          },
+        ),
+      ),
+      child: _buildBody(context),
+    );
+  }
+
+  @override
+  Widget build(context) {
+    return PlatformWidget(
+      androidBuilder: _buildAndroid,
+      iosBuilder: _buildIos,
+    );
+  }
+}
+
+class PreferenceCard extends StatelessWidget {
+  const PreferenceCard({
+    required this.header,
+    required this.content,
+    required this.preferenceChoices,
+    super.key,
+  });
+
+  final String header;
+  final String content;
+  final List<String> preferenceChoices;
+
+  @override
+  Widget build(context) {
+    return PressableCard(
+      color: Colors.green,
+      flattenAnimation: const AlwaysStoppedAnimation(0),
+      child: Stack(
+        children: [
+          SizedBox(
+            height: 120,
+            width: 250,
+            child: Padding(
+              padding: const EdgeInsets.only(top: 40),
+              child: Center(
+                child: Text(content, style: const TextStyle(fontSize: 48)),
+              ),
+            ),
+          ),
+          Positioned(
+            top: 0,
+            left: 0,
+            right: 0,
+            child: Container(
+              color: Colors.black12,
+              height: 40,
+              padding: const EdgeInsets.only(left: 12),
+              alignment: Alignment.centerLeft,
+              child: Text(
+                header,
+                style: const TextStyle(
+                  color: Colors.white,
+                  fontSize: 14,
+                  fontWeight: FontWeight.w600,
+                ),
+              ),
+            ),
+          ),
+        ],
+      ),
+      onPressed: () {
+        showChoices(context, preferenceChoices);
+      },
+    );
+  }
+}
+
+class LogOutButton extends StatelessWidget {
+  static const _logoutMessage = Text(
+    "You can't actually log out! This is just a demo of how alerts work.",
+  );
+
+  const LogOutButton({super.key});
+
+  // ===========================================================================
+  // Non-shared code below because this tab shows different interfaces. On
+  // Android, it's showing an alert dialog with 2 buttons and on iOS,
+  // it's showing an action sheet with 3 choices.
+  //
+  // This is a design choice and you may want to do something different in your
+  // app.
+  // ===========================================================================
+
+  Widget _buildAndroid(BuildContext context) {
+    return ElevatedButton(
+      child: const Text('LOG OUT', style: TextStyle(color: Colors.red)),
+      onPressed: () {
+        // You should do something with the result of the dialog prompt in a
+        // real app but this is just a demo.
+        showDialog<void>(
+          context: context,
+          builder: (context) {
+            return AlertDialog(
+              title: const Text('Log out?'),
+              content: _logoutMessage,
+              actions: [
+                TextButton(
+                  child: const Text('Got it'),
+                  onPressed: () => Navigator.pop(context),
+                ),
+                TextButton(
+                  child: const Text('Cancel'),
+                  onPressed: () => Navigator.pop(context),
+                ),
+              ],
+            );
+          },
+        );
+      },
+    );
+  }
+
+  Widget _buildIos(BuildContext context) {
+    return CupertinoButton(
+      color: CupertinoColors.destructiveRed,
+      child: const Text('Log out'),
+      onPressed: () {
+        // You should do something with the result of the action sheet prompt
+        // in a real app but this is just a demo.
+        showCupertinoModalPopup<void>(
+          context: context,
+          builder: (context) {
+            return CupertinoActionSheet(
+              title: const Text('Log out?'),
+              message: _logoutMessage,
+              actions: [
+                CupertinoActionSheetAction(
+                  isDestructiveAction: true,
+                  onPressed: () => Navigator.pop(context),
+                  child: const Text('Reprogram the night man'),
+                ),
+                CupertinoActionSheetAction(
+                  child: const Text('Got it'),
+                  onPressed: () => Navigator.pop(context),
+                ),
+              ],
+              cancelButton: CupertinoActionSheetAction(
+                isDefaultAction: true,
+                onPressed: () => Navigator.pop(context),
+                child: const Text('Cancel'),
+              ),
+            );
+          },
+        );
+      },
+    );
+  }
+
+  @override
+  Widget build(context) {
+    return PlatformWidget(
+      androidBuilder: _buildAndroid,
+      iosBuilder: _buildIos,
+    );
+  }
+}

platform_design/lib/settings_tab.dart

@@ -0,0 +1,113 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+import 'widgets.dart';
+
+class SettingsTab extends StatefulWidget {
+  static const title = 'Settings';
+  static const androidIcon = Icon(Icons.settings);
+  static const iosIcon = Icon(CupertinoIcons.gear);
+
+  const SettingsTab({super.key});
+
+  @override
+  State<SettingsTab> createState() => _SettingsTabState();
+}
+
+class _SettingsTabState extends State<SettingsTab> {
+  var switch1 = false;
+  var switch2 = true;
+  var switch3 = true;
+  var switch4 = true;
+  var switch5 = true;
+  var switch6 = false;
+  var switch7 = true;
+
+  Widget _buildList() {
+    return ListView(
+      children: [
+        const Padding(padding: EdgeInsets.only(top: 24)),
+        ListTile(
+          title: const Text('Send me marketing emails'),
+          // The Material switch has a platform adaptive constructor.
+          trailing: Switch.adaptive(
+            value: switch1,
+            onChanged: (value) => setState(() => switch1 = value),
+          ),
+        ),
+        ListTile(
+          title: const Text('Enable notifications'),
+          trailing: Switch.adaptive(
+            value: switch2,
+            onChanged: (value) => setState(() => switch2 = value),
+          ),
+        ),
+        ListTile(
+          title: const Text('Remind me to rate this app'),
+          trailing: Switch.adaptive(
+            value: switch3,
+            onChanged: (value) => setState(() => switch3 = value),
+          ),
+        ),
+        ListTile(
+          title: const Text('Background song refresh'),
+          trailing: Switch.adaptive(
+            value: switch4,
+            onChanged: (value) => setState(() => switch4 = value),
+          ),
+        ),
+        ListTile(
+          title: const Text('Recommend me songs based on my location'),
+          trailing: Switch.adaptive(
+            value: switch5,
+            onChanged: (value) => setState(() => switch5 = value),
+          ),
+        ),
+        ListTile(
+          title: const Text('Auto-transition playback to cast devices'),
+          trailing: Switch.adaptive(
+            value: switch6,
+            onChanged: (value) => setState(() => switch6 = value),
+          ),
+        ),
+        ListTile(
+          title: const Text('Find friends from my contact list'),
+          trailing: Switch.adaptive(
+            value: switch7,
+            onChanged: (value) => setState(() => switch7 = value),
+          ),
+        ),
+      ],
+    );
+  }
+
+  // ===========================================================================
+  // Non-shared code below because this tab uses different scaffolds.
+  // ===========================================================================
+
+  Widget _buildAndroid(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text(SettingsTab.title)),
+      body: _buildList(),
+    );
+  }
+
+  Widget _buildIos(BuildContext context) {
+    return CupertinoPageScaffold(
+      navigationBar: const CupertinoNavigationBar(),
+      child: _buildList(),
+    );
+  }
+
+  @override
+  Widget build(context) {
+    return PlatformWidget(
+      androidBuilder: _buildAndroid,
+      iosBuilder: _buildIos,
+    );
+  }
+}

platform_design/lib/song_detail_tab.dart

@@ -0,0 +1,112 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+import 'widgets.dart';
+
+/// Page shown when a card in the songs tab is tapped.
+///
+/// On Android, this page sits at the top of your app. On iOS, this page is on
+/// top of the songs tab's content but is below the tab bar itself.
+class SongDetailTab extends StatelessWidget {
+  const SongDetailTab({
+    required this.id,
+    required this.song,
+    required this.color,
+    super.key,
+  });
+
+  final int id;
+  final String song;
+  final Color color;
+
+  Widget _buildBody() {
+    return SafeArea(
+      bottom: false,
+      left: false,
+      right: false,
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Hero(
+            tag: id,
+            child: HeroAnimatingSongCard(
+              song: song,
+              color: color,
+              heroAnimation: const AlwaysStoppedAnimation(1),
+            ),
+            // This app uses a flightShuttleBuilder to specify the exact widget
+            // to build while the hero transition is mid-flight.
+            //
+            // It could either be specified here or in SongsTab.
+            flightShuttleBuilder:
+                (
+                  context,
+                  animation,
+                  flightDirection,
+                  fromHeroContext,
+                  toHeroContext,
+                ) {
+                  return HeroAnimatingSongCard(
+                    song: song,
+                    color: color,
+                    heroAnimation: animation,
+                  );
+                },
+          ),
+          const Divider(height: 0, color: Colors.grey),
+          Expanded(
+            child: ListView.builder(
+              itemCount: 10,
+              itemBuilder: (context, index) => switch (index) {
+                0 => const Padding(
+                  padding: EdgeInsets.only(left: 15, top: 16, bottom: 8),
+                  child: Text(
+                    'You might also like:',
+                    style: TextStyle(
+                      fontSize: 16,
+                      fontWeight: FontWeight.w500,
+                    ),
+                  ),
+                ),
+                _ => const SongPlaceholderTile(),
+              },
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  // ===========================================================================
+  // Non-shared code below because we're using different scaffolds.
+  // ===========================================================================
+
+  Widget _buildAndroid(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Text(song)),
+      body: _buildBody(),
+    );
+  }
+
+  Widget _buildIos(BuildContext context) {
+    return CupertinoPageScaffold(
+      navigationBar: CupertinoNavigationBar(
+        middle: Text(song),
+        previousPageTitle: 'Songs',
+      ),
+      child: _buildBody(),
+    );
+  }
+
+  @override
+  Widget build(context) {
+    return PlatformWidget(
+      androidBuilder: _buildAndroid,
+      iosBuilder: _buildIos,
+    );
+  }
+}

platform_design/lib/songs_tab.dart

@@ -0,0 +1,173 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+import 'song_detail_tab.dart';
+import 'utils.dart';
+import 'widgets.dart';
+
+class SongsTab extends StatefulWidget {
+  static const title = 'Songs';
+  static const androidIcon = Icon(Icons.music_note);
+  static const iosIcon = Icon(CupertinoIcons.music_note);
+
+  const SongsTab({super.key, this.androidDrawer});
+
+  final Widget? androidDrawer;
+
+  @override
+  State<SongsTab> createState() => _SongsTabState();
+}
+
+class _SongsTabState extends State<SongsTab> {
+  static const _itemsLength = 50;
+
+  final _androidRefreshKey = GlobalKey<RefreshIndicatorState>();
+
+  late List<MaterialColor> colors;
+  late List<String> songNames;
+
+  @override
+  void initState() {
+    _setData();
+    super.initState();
+  }
+
+  void _setData() {
+    colors = getRandomColors(_itemsLength);
+    songNames = getRandomNames(_itemsLength);
+  }
+
+  Future<void> _refreshData() {
+    return Future.delayed(
+      // This is just an arbitrary delay that simulates some network activity.
+      const Duration(seconds: 2),
+      () => setState(() => _setData()),
+    );
+  }
+
+  Widget _listBuilder(BuildContext context, int index) {
+    if (index >= _itemsLength) return Container();
+
+    // Show a slightly different color palette. Show poppy-ier colors on iOS
+    // due to lighter contrasting bars and tone it down on Android.
+    final color = defaultTargetPlatform == TargetPlatform.iOS
+        ? colors[index]
+        : colors[index].shade400;
+
+    return SafeArea(
+      top: false,
+      bottom: false,
+      child: Hero(
+        tag: index,
+        child: HeroAnimatingSongCard(
+          song: songNames[index],
+          color: color,
+          heroAnimation: const AlwaysStoppedAnimation(0),
+          onPressed: () => Navigator.of(context).push<void>(
+            MaterialPageRoute(
+              builder: (context) => SongDetailTab(
+                id: index,
+                song: songNames[index],
+                color: color,
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  void _togglePlatform() {
+    if (defaultTargetPlatform == TargetPlatform.iOS) {
+      debugDefaultTargetPlatformOverride = TargetPlatform.android;
+    } else {
+      debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+    }
+
+    // This rebuilds the application. This should obviously never be
+    // done in a real app but it's done here since this app
+    // unrealistically toggles the current platform for demonstration
+    // purposes.
+    WidgetsBinding.instance.reassembleApplication();
+  }
+
+  // ===========================================================================
+  // Non-shared code below because:
+  // - Android and iOS have different scaffolds
+  // - There are different items in the app bar / nav bar
+  // - Android has a hamburger drawer, iOS has bottom tabs
+  // - The iOS nav bar is scrollable, Android is not
+  // - Pull-to-refresh works differently, and Android has a button to trigger it too
+  //
+  // And these are all design time choices that doesn't have a single 'right'
+  // answer.
+  // ===========================================================================
+  Widget _buildAndroid(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text(SongsTab.title),
+        actions: [
+          IconButton(
+            icon: const Icon(Icons.refresh),
+            onPressed: () async =>
+                await _androidRefreshKey.currentState!.show(),
+          ),
+          IconButton(
+            icon: const Icon(Icons.shuffle),
+            onPressed: _togglePlatform,
+          ),
+        ],
+      ),
+      drawer: widget.androidDrawer,
+      body: RefreshIndicator(
+        key: _androidRefreshKey,
+        onRefresh: _refreshData,
+        child: ListView.builder(
+          padding: const EdgeInsets.symmetric(vertical: 12),
+          itemCount: _itemsLength,
+          itemBuilder: _listBuilder,
+        ),
+      ),
+    );
+  }
+
+  Widget _buildIos(BuildContext context) {
+    return CustomScrollView(
+      slivers: [
+        CupertinoSliverNavigationBar(
+          trailing: CupertinoButton(
+            padding: EdgeInsets.zero,
+            onPressed: _togglePlatform,
+            child: const Icon(CupertinoIcons.shuffle),
+          ),
+        ),
+        CupertinoSliverRefreshControl(onRefresh: _refreshData),
+        SliverSafeArea(
+          top: false,
+          sliver: SliverPadding(
+            padding: const EdgeInsets.symmetric(vertical: 12),
+            sliver: SliverList(
+              delegate: SliverChildBuilderDelegate(
+                _listBuilder,
+                childCount: _itemsLength,
+              ),
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+
+  @override
+  Widget build(context) {
+    return PlatformWidget(
+      androidBuilder: _buildAndroid,
+      iosBuilder: _buildIos,
+    );
+  }
+}

platform_design/lib/utils.dart

@@ -0,0 +1,76 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:math';
+
+import 'package:english_words/english_words.dart';
+// ignore: implementation_imports
+import 'package:flutter/material.dart';
+
+// This file has a number of platform-agnostic non-Widget utility functions.
+
+const _myListOfRandomColors = [
+  Colors.red,
+  Colors.blue,
+  Colors.teal,
+  Colors.yellow,
+  Colors.amber,
+  Colors.deepOrange,
+  Colors.green,
+  Colors.indigo,
+  Colors.lime,
+  Colors.pink,
+  Colors.orange,
+];
+
+final _random = Random();
+
+// Avoid customizing the word generator, which can be slow.
+// https://github.com/filiph/english_words/issues/9
+final wordPairIterator = generateWordPairs();
+
+String generateRandomHeadline() {
+  final artist = capitalizePair(wordPairIterator.first);
+
+  return switch (_random.nextInt(10)) {
+    0 => '$artist says ${nouns[_random.nextInt(nouns.length)]}',
+    1 => '$artist arrested due to ${wordPairIterator.first.join(' ')}',
+    2 => '$artist releases ${capitalizePair(wordPairIterator.first)}',
+    3 => '$artist talks about his ${nouns[_random.nextInt(nouns.length)]}',
+    4 => '$artist talks about her ${nouns[_random.nextInt(nouns.length)]}',
+    5 => '$artist talks about their ${nouns[_random.nextInt(nouns.length)]}',
+    6 =>
+      '$artist says their music is inspired by ${wordPairIterator.first.join(' ')}',
+    7 =>
+      '$artist says the world needs more ${nouns[_random.nextInt(nouns.length)]}',
+    8 =>
+      '$artist calls their band ${adjectives[_random.nextInt(adjectives.length)]}',
+    9 =>
+      '$artist finally ready to talk about ${nouns[_random.nextInt(nouns.length)]}',
+    _ => 'Failed to generate news headline',
+  };
+}
+
+List<MaterialColor> getRandomColors(int amount) {
+  return List<MaterialColor>.generate(amount, (index) {
+    return _myListOfRandomColors[_random.nextInt(
+      _myListOfRandomColors.length,
+    )];
+  });
+}
+
+List<String> getRandomNames(int amount) {
+  return wordPairIterator
+      .take(amount)
+      .map((pair) => capitalizePair(pair))
+      .toList();
+}
+
+String capitalize(String word) {
+  return '${word[0].toUpperCase()}${word.substring(1).toLowerCase()}';
+}
+
+String capitalizePair(WordPair pair) {
+  return '${capitalize(pair.first)} ${capitalize(pair.second)}';
+}

platform_design/lib/widgets.dart

@@ -0,0 +1,373 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+/// A simple widget that builds different things on different platforms.
+class PlatformWidget extends StatelessWidget {
+  const PlatformWidget({
+    super.key,
+    required this.androidBuilder,
+    required this.iosBuilder,
+  });
+
+  final WidgetBuilder androidBuilder;
+  final WidgetBuilder iosBuilder;
+
+  @override
+  Widget build(context) {
+    assert(
+      defaultTargetPlatform == TargetPlatform.android ||
+          defaultTargetPlatform == TargetPlatform.iOS,
+      'Unexpected platform $defaultTargetPlatform',
+    );
+    return switch (defaultTargetPlatform) {
+      TargetPlatform.android => androidBuilder(context),
+      TargetPlatform.iOS => iosBuilder(context),
+      _ => const SizedBox.shrink(),
+    };
+  }
+}
+
+/// A platform-agnostic card with a high elevation that reacts when tapped.
+///
+/// This is an example of a custom widget that an app developer might create for
+/// use on both iOS and Android as part of their brand's unique design.
+class PressableCard extends StatefulWidget {
+  const PressableCard({
+    this.onPressed,
+    required this.color,
+    required this.flattenAnimation,
+    this.child,
+    super.key,
+  });
+
+  final VoidCallback? onPressed;
+  final Color color;
+  final Animation<double> flattenAnimation;
+  final Widget? child;
+
+  @override
+  State<StatefulWidget> createState() => _PressableCardState();
+}
+
+class _PressableCardState extends State<PressableCard>
+    with SingleTickerProviderStateMixin {
+  bool pressed = false;
+  late final AnimationController controller;
+  late final Animation<double> elevationAnimation;
+
+  @override
+  void initState() {
+    controller = AnimationController(
+      vsync: this,
+      duration: const Duration(milliseconds: 40),
+    );
+    elevationAnimation = controller.drive(
+      CurveTween(curve: Curves.easeInOutCubic),
+    );
+    super.initState();
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+
+  double get flatten => 1 - widget.flattenAnimation.value;
+
+  @override
+  Widget build(context) {
+    return Listener(
+      onPointerDown: (details) {
+        if (widget.onPressed != null) {
+          controller.forward();
+        }
+      },
+      onPointerUp: (details) {
+        controller.reverse();
+      },
+      child: GestureDetector(
+        behavior: HitTestBehavior.opaque,
+        onTap: () {
+          widget.onPressed?.call();
+        },
+        // This widget both internally drives an animation when pressed and
+        // responds to an external animation to flatten the card when in a
+        // hero animation. You likely want to modularize them more in your own
+        // app.
+        child: AnimatedBuilder(
+          animation: Listenable.merge([
+            elevationAnimation,
+            widget.flattenAnimation,
+          ]),
+          child: widget.child,
+          builder: (context, child) {
+            return Transform.scale(
+              // This is just a sample. You likely want to keep the math cleaner
+              // in your own app.
+              scale: 1 - elevationAnimation.value * 0.03,
+              child: Padding(
+                padding:
+                    const EdgeInsets.symmetric(
+                      vertical: 16,
+                      horizontal: 16,
+                    ) *
+                    flatten,
+                child: PhysicalModel(
+                  elevation:
+                      ((1 - elevationAnimation.value) * 10 + 10) * flatten,
+                  borderRadius: BorderRadius.circular(12 * flatten),
+                  clipBehavior: Clip.antiAlias,
+                  color: widget.color,
+                  child: child,
+                ),
+              ),
+            );
+          },
+        ),
+      ),
+    );
+  }
+}
+
+/// A platform-agnostic card representing a song which can be in a card state,
+/// a flat state or anything in between.
+///
+/// When it's in a card state, it's pressable.
+///
+/// This is an example of a custom widget that an app developer might create for
+/// use on both iOS and Android as part of their brand's unique design.
+class HeroAnimatingSongCard extends StatelessWidget {
+  const HeroAnimatingSongCard({
+    required this.song,
+    required this.color,
+    required this.heroAnimation,
+    this.onPressed,
+    super.key,
+  });
+
+  final String song;
+  final Color color;
+  final Animation<double> heroAnimation;
+  final VoidCallback? onPressed;
+
+  double get playButtonSize => 50 + 50 * heroAnimation.value;
+
+  @override
+  Widget build(context) {
+    // This is an inefficient usage of AnimatedBuilder since it's rebuilding
+    // the entire subtree instead of passing in a non-changing child and
+    // building a transition widget in between.
+    //
+    // Left simple in this demo because this card doesn't have any real inner
+    // content so this just rebuilds everything while animating.
+    return AnimatedBuilder(
+      animation: heroAnimation,
+      builder: (context, child) {
+        return PressableCard(
+          onPressed: heroAnimation.value == 0 ? onPressed : null,
+          color: color,
+          flattenAnimation: heroAnimation,
+          child: SizedBox(
+            height: 250,
+            child: Stack(
+              alignment: Alignment.center,
+              children: [
+                // The song title banner slides off in the hero animation.
+                Positioned(
+                  bottom: -80 * heroAnimation.value,
+                  left: 0,
+                  right: 0,
+                  child: Container(
+                    height: 80,
+                    color: Colors.black12,
+                    alignment: Alignment.centerLeft,
+                    padding: const EdgeInsets.symmetric(horizontal: 12),
+                    child: Text(
+                      song,
+                      style: const TextStyle(
+                        fontSize: 21,
+                        fontWeight: FontWeight.w500,
+                      ),
+                    ),
+                  ),
+                ),
+                // The play button grows in the hero animation.
+                Padding(
+                  padding:
+                      const EdgeInsets.only(bottom: 45) *
+                      (1 - heroAnimation.value),
+                  child: Container(
+                    height: playButtonSize,
+                    width: playButtonSize,
+                    decoration: const BoxDecoration(
+                      shape: BoxShape.circle,
+                      color: Colors.black12,
+                    ),
+                    alignment: Alignment.center,
+                    child: Icon(
+                      Icons.play_arrow,
+                      size: playButtonSize,
+                      color: Colors.black38,
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        );
+      },
+    );
+  }
+}
+
+/// A loading song tile's silhouette.
+///
+/// This is an example of a custom widget that an app developer might create for
+/// use on both iOS and Android as part of their brand's unique design.
+class SongPlaceholderTile extends StatelessWidget {
+  const SongPlaceholderTile({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return SizedBox(
+      height: 95,
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 15, vertical: 8),
+        child: Row(
+          children: [
+            Container(
+              color: Theme.of(context).textTheme.bodyMedium!.color,
+              width: 130,
+            ),
+            const Padding(padding: EdgeInsets.only(left: 12)),
+            Expanded(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Container(
+                    height: 9,
+                    margin: const EdgeInsets.only(right: 60),
+                    color: Theme.of(context).textTheme.bodyMedium!.color,
+                  ),
+                  Container(
+                    height: 9,
+                    margin: const EdgeInsets.only(right: 20, top: 8),
+                    color: Theme.of(context).textTheme.bodyMedium!.color,
+                  ),
+                  Container(
+                    height: 9,
+                    margin: const EdgeInsets.only(right: 40, top: 8),
+                    color: Theme.of(context).textTheme.bodyMedium!.color,
+                  ),
+                  Container(
+                    height: 9,
+                    margin: const EdgeInsets.only(right: 80, top: 8),
+                    color: Theme.of(context).textTheme.bodyMedium!.color,
+                  ),
+                  Container(
+                    height: 9,
+                    margin: const EdgeInsets.only(right: 50, top: 8),
+                    color: Theme.of(context).textTheme.bodyMedium!.color,
+                  ),
+                ],
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+// ===========================================================================
+// Non-shared code below because different interfaces are shown to prompt
+// for a multiple-choice answer.
+//
+// This is a design choice and you may want to do something different in your
+// app.
+// ===========================================================================
+/// This uses a platform-appropriate mechanism to show users multiple choices.
+///
+/// On Android, it uses a dialog with radio buttons. On iOS, it uses a picker.
+void showChoices(BuildContext context, List<String> choices) {
+  switch (defaultTargetPlatform) {
+    case TargetPlatform.android:
+      showDialog<void>(
+        context: context,
+        builder: (context) {
+          int? selectedRadio = 1;
+          return AlertDialog(
+            contentPadding: const EdgeInsets.only(top: 12),
+            content: StatefulBuilder(
+              builder: (context, setState) {
+                return RadioGroup(
+                  groupValue: selectedRadio,
+                  onChanged: (value) {
+                    setState(() => selectedRadio = value);
+                  },
+                  child: Column(
+                    mainAxisSize: MainAxisSize.min,
+                    children: List<Widget>.generate(choices.length, (
+                      index,
+                    ) {
+                      return RadioListTile<int?>(
+                        title: Text(choices[index]),
+                        value: index,
+                      );
+                    }),
+                  ),
+                );
+              },
+            ),
+            actions: [
+              TextButton(
+                child: const Text('OK'),
+                onPressed: () => Navigator.of(context).pop(),
+              ),
+              TextButton(
+                child: const Text('CANCEL'),
+                onPressed: () => Navigator.of(context).pop(),
+              ),
+            ],
+          );
+        },
+      );
+      return;
+    case TargetPlatform.iOS:
+      showCupertinoModalPopup<void>(
+        context: context,
+        builder: (context) {
+          return SizedBox(
+            height: 250,
+            child: CupertinoPicker(
+              backgroundColor: Theme.of(context).canvasColor,
+              useMagnifier: true,
+              magnification: 1.1,
+              itemExtent: 40,
+              scrollController: FixedExtentScrollController(
+                initialItem: 1,
+              ),
+              children: List<Widget>.generate(choices.length, (index) {
+                return Center(
+                  child: Text(
+                    choices[index],
+                    style: const TextStyle(fontSize: 21),
+                  ),
+                );
+              }),
+              onSelectedItemChanged: (value) {},
+            ),
+          );
+        },
+      );
+      return;
+    default:
+      assert(false, 'Unexpected platform $defaultTargetPlatform');
+  }
+}

platform_design/pubspec.yaml

@@ -0,0 +1,22 @@
+name: platform_design
+description: A project showcasing a Flutter app following different platform IA conventions.
+version: 1.0.0+1
+resolution: workspace
+
+environment:
+  sdk: ^3.9.0-0
+
+dependencies:
+  english_words: ^4.0.0
+  flutter_lorem: ^2.0.0
+  flutter:
+    sdk: flutter
+  cupertino_icons: ^1.0.2
+
+dev_dependencies:
+  analysis_defaults:
+    path: ../analysis_defaults
+  flutter_test:
+    sdk: flutter
+flutter:
+  uses-material-design: true

platform_design/test/widget_test.dart

@@ -0,0 +1,42 @@
+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:platform_design/main.dart';
+
+void main() {
+  group('Platform tests', () {
+    testWidgets('Builds for Android correctly', (tester) async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.android;
+      await tester.pumpWidget(const MyAdaptingApp());
+
+      // The test should be able to find the drawer button.
+      expect(find.byIcon(Icons.menu), findsOneWidget);
+      // There should be a refresh button.
+      expect(find.byIcon(Icons.refresh), findsOneWidget);
+
+      // Since this is a static, undo any change made in the test.
+      debugDefaultTargetPlatformOverride = null;
+    });
+
+    testWidgets('Builds for iOS correctly', (tester) async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+      await tester.pumpWidget(const MyAdaptingApp());
+
+      // There should now be a large title style nav bar.
+      expect(find.byType(CupertinoSliverNavigationBar), findsOneWidget);
+      // There's a tab button for the first tab.
+      expect(find.byIcon(CupertinoIcons.music_note), findsOneWidget);
+      // The hamburger button isn't there anymore.
+      expect(find.byIcon(Icons.menu), findsNothing);
+
+      // Since this is a static, undo any change made in the test.
+      debugDefaultTargetPlatformOverride = null;
+    });
+  });
+}

platform_design/web/index.html

@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <!--
+    If you are serving your web app in a path other than the root, change the
+    href value below to reflect the base path you are serving from.
+
+    The path provided below has to start and end with a slash "/" in order for
+    it to work correctly.
+
+    For more details:
+    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
+
+    This is a placeholder for base href that will be replaced by the value of
+    the `--base-href` argument provided to `flutter build`.
+  -->
+  <base href="$FLUTTER_BASE_HREF">
+
+  <meta charset="UTF-8">
+  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
+  <meta name="description" content="A new Flutter project.">
+
+  <!-- iOS meta tags & icons -->
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="black">
+  <meta name="apple-mobile-web-app-title" content="platform_design">
+  <link rel="apple-touch-icon" href="icons/Icon-192.png">
+
+  <!-- Favicon -->
+  <link rel="icon" type="image/png" href="favicon.png"/>
+
+  <title>platform_design</title>
+  <link rel="manifest" href="manifest.json">
+</head>
+<body>
+  <script src="flutter_bootstrap.js" async></script>
+</body>
+</html>

platform_design/web/manifest.json

@@ -0,0 +1,35 @@
+{
+    "name": "platform_design",
+    "short_name": "platform_design",
+    "start_url": ".",
+    "display": "standalone",
+    "background_color": "#0175C2",
+    "theme_color": "#0175C2",
+    "description": "A project showcasing a Flutter app following different platform IA conventions.",
+    "orientation": "portrait-primary",
+    "prefer_related_applications": false,
+    "icons": [
+        {
+            "src": "icons/Icon-192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "icons/Icon-512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        },
+        {
+            "src": "icons/Icon-maskable-192.png",
+            "sizes": "192x192",
+            "type": "image/png",
+            "purpose": "maskable"
+        },
+        {
+            "src": "icons/Icon-maskable-512.png",
+            "sizes": "512x512",
+            "type": "image/png",
+            "purpose": "maskable"
+        }
+    ]
+}