Per-App-Language-Change

Change app language using following steps

Step-1

In Manifest, add a service

<!--Must add this service for android 12 or lower && 'autoStoreLocales' means to save value in Shared Preference-->
    <service
        android:name="androidx.appcompat.app.AppLocalesMetadataHolderService"
        android:enabled="false"
        android:exported="false">
        <meta-data
            android:name="autoStoreLocales"
            android:value="true" />
    </service>

Step-2

In Gradle (app), add following

  a)
    /* Must update compile SDK & target SDK to 33 for Appcompat 1.6.0-beta01 or higher. */
    compileSdk 33
    targetSdk 33
    
  b)
    /* Must update dependency Appcompat 1.6.0-beta01 or higher. */
    implementation 'androidx.appcompat:appcompat:1.6.0-beta01'

Step-3

In Gradle (app), add following code to prevent string.xml files from being spliting in release bundle.

bundle {
    language {
        // Specifies that the app bundle should not support
        // configuration APKs for language resources. These
        // resources are instead packaged with each base and
        // dynamic feature APK.
        enableSplit = false
    }
}

Step-4

Add string.xml for your desired languages

Step-6

//Pass language code to following function to update app locale e.g. "en" for english
  
val appLocale: LocaleListCompat = LocaleListCompat.forLanguageTags("en")
AppCompatDelegate.setApplicationLocales(appLocale)

Happy Coding!