React Native App Icon Changer

react-native-app-icon-changer is a powerful and easy-to-use library that allows you to dynamically manage app icons in your React Native projects. It supports both iOS and Android platforms, enabling seamless switching between multiple app icons without requiring manual intervention or complex configuration. Whether you want to personalize your app's appearance or highlight special events, this library simplifies the entire process.

With react-native-app-icon-changer, you can dynamically change your app's icon during runtime. The package handles all necessary platform-specific configurations, ensuring a smooth integration process. Its primary use cases include event-based icon changes, seasonal themes, or user-specific customizations, providing enhanced user engagement and experience.

Key Features

• Dynamic App Icon Management: Easily change your app icon at runtime for both iOS and Android.
• Cross-Platform Support: Fully supports both iOS and Android devices, providing a consistent experience across platforms.
• No Manual Configuration: Avoid manual changes to native code, making it simpler to use across different versions of React Native.
• Event-based Icon Switching: Change app icons based on specific events or conditions in your app (e.g., holidays, promotions, or user preferences).

Compatibility

• React Native Old Architecture: The library is fully compatible with the traditional React Native architecture (using the older bridging mechanism).
• React Native New Architecture: It also supports the new React Native architecture (Fabric and TurboModules), ensuring smooth integration with the latest versions of React Native.

1. Install the react-native-app-icon-changer Package

Ensure you have the package installed in your project:

npm install react-native-app-icon-changer

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2. iOS Directory Structure

Ensure your project contains the following directory structure within the ios folder:

Images.xcassets
├── AppIcon.appiconset
├── AlternativeIcon.appiconset
    ├── 16.png
    ├── 20.png
    ├── 29.png
    ├── 32.png
    ├── 40.png
    ├── 48.png
    ├── 50.png
    ├── 55.png
    ├── 57.png
    ├── 58.png
    ├── 60.png
    ├── 64.png
    ├── 66.png
    ├── 72.png
    ├── 76.png
    ├── 80.png
    ├── 87.png
    ├── 88.png
    ├── 92.png
    ├── 100.png
    ├── 102.png
    ├── 108.png
    ├── 114.png
    ├── 120.png
    ├── 128.png
    ├── 144.png
    ├── 152.png
    ├── 167.png
    ├── 172.png
    ├── 180.png
    ├── 196.png
    ├── 216.png
    ├── 234.png
    ├── 256.png
    ├── 258.png
    ├── 512.png
    ├── 1024.png
    └── Contents.json

Ensure each icon is correctly sized and available in AppIcon.appiconset (primary icon) and AlternativeIcon.appiconset (alternative icon).

---

3. Contents.json Example

Ensure both AppIcon.appiconset and AlternativeIcon.appiconset include a Contents.json file. Below is an example:

{
  "images": [
    {
      "size": "20x20",
      "idiom": "iphone",
      "filename": "20.png",
      "scale": "2x"
    },
    {
      "size": "20x20",
      "idiom": "iphone",
      "filename": "40.png",
      "scale": "3x"
    },
    {
      "size": "1024x1024",
      "idiom": "ios-marketing",
      "filename": "1024.png",
      "scale": "1x"
    }
  ],
  "info": {
    "version": 1,
    "author": "xcode"
  }
}

Update this file to reflect the correct filenames for all required sizes.

---

4. Update Info.plist

At the bottom of your Info.plist, insert the following configuration to define your app icons:

Step 4.1: Add CFBundleIcons

Add the following key for CFBundleIcons:

<key>CFBundleIcons</key>
<dict>
  <key>CFBundlePrimaryIcon</key>
  <dict>
    <key>CFBundleIconFiles</key>
    <array>
      <string>AppIcon</string>
    </array>
  </dict>
  <key>CFBundleAlternateIcons</key>
  <dict>
    <key>AlternativeIcon</key>
    <dict>
      <key>CFBundleIconFiles</key>
      <array>
        <string>AlternativeIcon</string>
      </array>
    </dict>
  </dict>
</dict>

• Primary Icon: Set the first array item to the name of the .appiconset you created for the primary icon (e.g., AppIcon).
• Alternative Icons: Add keys for each alternative icon, referencing the names of the .appiconset files (e.g., AlternativeIcon).

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5. Configure Xcode Settings

In Xcode, configure the following:

1. Navigate to your app's General settings.
2. Under the App Icons and Launch Screen section:
   • Set App Icon to your default icon (e.g., AppIcon).
   • Check the box for Include all app icon assets.

Primary Icon:

Alternative Icon:

---

6. Android Setup

You don’t need to manually link or configure anything beyond placing the icons in the correct mipmap/ folders and modifying the AndroidManifest.xml file. Simply install the app and follow the instructions below, and everything will be set up automatically.

Upload Icons

Use Android Studio's Asset Studio: Android Studio provides an easy way to generate different icon sizes. You can use the Image Asset Studio (found under File > New > Image Asset) to generate all the necessary icon sizes for different screen densities.

Naming Icons Consistently: Ensure all icon images have consistent names (e.g., ic_launcher.png, ic_launcher_round.png), so they are easily referenced across your project.

Make sure you correctly reference the image name in your AndroidManifest.xml file. The icon file name should match exactly the name of the image you placed in the mipmap/ folder

<project-root>/
└── app/
    └── src/
        └── main/
            └── res/
                ├── mipmap-hdpi/
                │   └── ic_launcher_default.png
                │   └── ic_launcher_alternative.png
                │   └── ic_launcher_round_default.png
                │   └── ic_launcher_round_alternative.png
                ├── mipmap-mdpi/
                │   └── ic_launcher_default.png
                │   └── ic_launcher_alternative.png
                │   └── ic_launcher_round_default.png
                │   └── ic_launcher_round_alternative.png
                ├── mipmap-xhdpi/
                │   └── ic_launcher_default.png
                │   └── ic_launcher_alternative.png
                │   └── ic_launcher_round_default.png
                │   └── ic_launcher_round_alternative.png
                ├── mipmap-xxhdpi/
                │   └── ic_launcher_default.png
                │   └── ic_launcher_alternative.png
                │   └── ic_launcher_round_default.png
                │   └── ic_launcher_round_alternative.png
                ├── mipmap-xxxhdpi/
                │   └── ic_launcher_default.png
                │   └── ic_launcher_alternative.png
                │   └── ic_launcher_round_default.png
                │   └── ic_launcher_round_alternative.png
                ├── mipmap/
                │   └── ic_launcher_default.png
                │   └── ic_launcher_alternative.png
                │   └── ic_launcher_round_default.png
                │   └── ic_launcher_round_alternative.png
                └── ...

AndroidManifest File Setup

<project-root>/
└── app/
    └── src/
        └── main/
            └── AndroidManifest.xml

This configuration illustrates how to set up activity-alias elements and icon sets in the AndroidManifest.xml file. All activity aliases are initially disabled (android:enabled="false"), and default icons are used. The aliases are based on the ${applicationId} placeholder and use .MainActivity as the base activity.

<application
  android:name=".MainApplication"
  android:label="@string/app_name"
  android:icon="@mipmap/ic_launcher_default"
  android:roundIcon="@mipmap/ic_launcher_default_round"
  android:allowBackup="false"
  android:theme="@style/AppTheme"
  android:supportsRtl="true">
  <activity
    android:name=".MainActivity"
    android:label="@string/app_name"
    android:configChanges="keyboard|keyboardHidden|orientation"
    android:launchMode="singleTask"
    android:windowSoftInputMode="adjustResize"
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
  </activity>
  <activity-alias
        android:name="${applicationId}.MainActivityDefault"
        android:targetActivity=".MainActivity"
        android:icon="@mipmap/ic_launcher_default"
        android:roundIcon="@mipmap/ic_launcher_round_default"
        android:label="@string/app_name"
        android:enabled="false"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
  </activity-alias>
  <activity-alias
        android:name="${applicationId}.MainActivityAlternativeIcon"
        android:targetActivity=".MainActivity"
        android:icon="@mipmap/ic_launcher_alternative"
        android:roundIcon="@mipmap/ic_launcher_round_alternative"
        android:label="@string/app_name"
        android:enabled="false"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity-alias>
</application>

Permission

This permission is required if your app needs to enable or disable components dynamically, such as enabling/disabling activities, services, or receivers (e.g., using activity-alias in the manifest).

<uses-permission android:name="android.permission.CHANGE_COMPONENT_ENABLED_STATE" />

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7. Using react-native-app-icon-changer Functions

The react-native-app-icon-changer package provides the following functions:

import {
  getActiveIcon,
  setIcon,
  getAllAlternativeIcons,
  resetIcon,
} from 'react-native-app-icon-changer';

7.1 setIcon(iconName: string | null)

This function sets the app icon to the specified icon name.

• Parameters:
  • iconName: The name of the alternative icon to set.
• Example:

setIcon('AlternativeIcon');
setIcon('Default'); // Revert to default icon

7.2 getActiveIcon(): Promise<string | null>

This function retrieves the name of the currently active icon.

• Returns:
  • A promise resolving to the name of the active icon or null if the primary icon is active.
• Example:

getActiveIcon().then((activeIcon) =>
  console.log('Current active icon:', activeIcon)
);

7.3 getAllAlternativeIcons(): Promise<string[]>

This function retrieves a list of all alternative icons defined in the project.

• Returns:
  • A promise resolving to an array of alternative icon names.
• Example:

getAllAlternativeIcons().then((icons) =>
  console.log('Available alternative icons:', icons)
);

7.4 resetIcon(): Promise<void>

This function resets the app icon to the primary icon.

• Example:

resetIcon().then(() => console.log('Icon reset to primary successfully!'));