flutter_dynamic_icon

A flutter plugin for dynamically changing app icon in mobile platform. Supports iOS and Android (IOS with version > 10.3).

Known issues

• Each android version will have different behavior, with Android 8 it may take a few seconds before we can notice the change
• Caution: Using this feature on some android versions will cause your app to crash (it will crash the first time you change the icon, next time it won't), it's a bad user experience that you have to crash the app to change the app icon, you can read more about this issue here
• Due to Splash screen problems of newest Android versions, please consider to remove the below code in your activivy and activity-alias tags:

  <meta-data
                android:name="io.flutter.embedding.android.SplashScreenDrawable"
                android:resource="@drawable/launch_background"
                />

• Add this code to your MainActivity.kt, in onCreate function:

	 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
            // Disable the Android splash screen fade out animation to avoid
            // a flicker before the similar frame is drawn in Flutter.
            splashScreen.setOnExitAnimationListener { splashScreenView -> splashScreenView.remove() }
        }

Android Integration

1. Add the latest version of the plugin to your pubpsec.yaml under dependencies section
2. Run flutter pub get
3. Update android/src/main/AndroidManifest.xml as follows:

   <application ...>
   
       <activity
           android:name=".MainActivity"
           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"
           android:enabled="true">
   			
           <meta-data
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
               />
   
           <meta-data
               android:name="io.flutter.embedding.android.SplashScreenDrawable"
               android:resource="@drawable/launch_background"
               />
   
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>
   
       <!-- The activity-alias are your alternatives icons and name of your app, the default one must be enabled (and the others disabled) and the name must be ".DEFAULT". All the names of your activity-alias' name must begin with a dot. -->
   
       <!-- FOR NOW USE "icon_1" AS ALTERNATIVE ICON NAME -->
   
       <activity-alias
           android:label="Your app"
           android:icon="@mipmap/ic_launcher_1"
           android:name=".icon_1"
           android:enabled="false"
           android:targetActivity=".MainActivity">
   
           <meta-data
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
               />
   
           <meta-data
               android:name="io.flutter.embedding.android.SplashScreenDrawable"
               android:resource="@drawable/launch_background"
               />
   
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
   
       </activity-alias>
   </application>

4. You can have multiple app icon, in your app you can now use:
   • The name you pass in the method must be in the AndroidManifest.xml and for each icon, you must declare an activity-alias in AndroidManifest.xml like above
   • Declare an list of string (your available app icons)
   • Dont forget to add MainActivity to your list

   const List<String> list = ["icon_1", "icon_2", "icon_n", "MainActivity"]
   DynamicIconFlutter.setIcon(icon: 'icon_1', listAvailableIcon: list);

iOS Integration

Index

• 2x - 120px x 120px
• 3x - 180px x 180px

To integrate your plugin into the iOS part of your app, follow these steps

1. First let us put a few images for app icons, they are

   • [email protected], [email protected]
   • [email protected], [email protected],
   • [email protected], [email protected],

2. These icons shouldn't be kept in Assets.xcassets folder, but outside

3. Next, we need to setup the Info.plist

   1. Add Icon files (iOS 5) to the Information Property List
   2. Add CFBundleAlternateIcons as a dictionary, it is used for alternative icons
   3. Set 3 dictionaries under CFBundleAlternateIcons, they are correspond to teamfortress, photos, and chills
   4. For each dictionary, two properties — UIPrerenderedIcon and CFBundleIconFiles need to be configured

Note that if you need it work for iPads, You need to add these icon declarations in CFBundleIcons~ipad as well. See here for more details.

Here is Info.plist after adding Alternate Icons

Screenshot

Raw

<?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>$(EXECUTABLE_NAME)</string>
	<key>CFBundleIcons</key>
	<dict>
		<key>CFBundleAlternateIcons</key>
		<dict>
			<key>chills</key>
			<dict>
				<key>CFBundleIconFiles</key>
				<array>
					<string>chills</string>
				</array>
				<key>UIPrerenderedIcon</key>
				<false/>
			</dict>
			<key>photos</key>
			<dict>
				<key>CFBundleIconFiles</key>
				<array>
					<string>photos</string>
				</array>
				<key>UIPrerenderedIcon</key>
				<false/>
			</dict>
			<key>teamfortress</key>
			<dict>
				<key>CFBundleIconFiles</key>
				<array>
					<string>teamfortress</string>
				</array>
				<key>UIPrerenderedIcon</key>
				<false/>
			</dict>
		</dict>
		<key>CFBundlePrimaryIcon</key>
		<dict>
			<key>CFBundleIconFiles</key>
			<array>
				<string>chills</string>
			</array>
			<key>UIPrerenderedIcon</key>
			<false/>
		</dict>
	</dict>
	<key>CFBundleIdentifier</key>
	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
	<key>CFBundleInfoDictionaryVersion</key>
	<string>6.0</string>
	<key>CFBundleName</key>
	<string>flutter_dynamic_icon_example</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>UIViewControllerBasedStatusBarAppearance</key>
	<false/>
</dict>
</plist>

Now, you can call DynamicIconFlutter.setAlternateIconName with the CFBundleAlternateIcons key as the argument to set that icon.

Dart/Flutter Integration

From your Dart code, you need to import the plugin and use it's static methods:

import 'package:dynamic_icon_flutter/dynamic_icon_flutter.dart';

try {
  if (await DynamicIconFlutter.supportsAlternateIcons) {
    await DynamicIconFlutter.setAlternateIconName("photos");
    print("App icon change successful");
    return;
  }
} on PlatformException catch (e) {
    if (await DynamicIconFlutter.supportsAlternateIcons) {
        await DynamicIconFlutter.setAlternateIconName(null);
        print("Change app icon back to default");
        return;
  } else {
      print("Failed to change app icon");
  }
}