Change language programmatically (Android N 7.0 - API 24)

Question

I\'m using the following code to set specific language in my app. Language is saved into SharedPreferences within the app. And it works perfectly up to

Answer 1

 This approach will work on all api level device, Make sure to recreate activity on changing language programatically.

1.Use Base Activity for attachBaseContext to set the locale language And extend this activity for all activities

open class  BaseAppCompactActivity() : AppCompatActivity() {

    override fun attachBaseContext(newBase: Context) {
        super.attachBaseContext(LocaleHelper.onAttach(newBase))

    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

    }

}



2. Use Application attachBaseContext and onConfigurationChanged to set the locale language

 public class MyApplication extends Application {
private static MyApplication application;

    @Override
    public void onCreate() {
        super.onCreate();
    }

    public static MyApplication getApplication() {
        return application;
    }

    /**
     * overide to change local sothat language can be chnaged from android device  nogaut and above
     */
    @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(LocaleHelper.INSTANCE.onAttach(base));
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {

/*** also handle chnage language if device language chnaged **/

        super.onConfigurationChanged(newConfig);

    }



3. Use Locale Helper  for handling language changes ,this approch work on all device 

object LocaleHelper {


    fun onAttach(context: Context, defaultLanguage: String): Context {
        return setLocale(context, defaultLanguage)
    }



    fun setLocale(context: Context, language: String): Context {
        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            updateResources(context, language)
        } else updateResourcesLegacy(context, language)

    }


    @TargetApi(Build.VERSION_CODES.N)
    private fun updateResources(context: Context, language: String): Context {
        val locale = Locale(language)
        Locale.setDefault(locale)

        val configuration = context.getResources().getConfiguration()
        configuration.setLocale(locale)
        configuration.setLayoutDirection(locale)

        return context.createConfigurationContext(configuration)
    }

    private fun updateResourcesLegacy(context: Context, language: String): Context {
        val locale = Locale(language)
        Locale.setDefault(locale)

        val resources = context.getResources()

        val configuration = resources.getConfiguration()
        configuration.locale = locale
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            configuration.setLayoutDirection(locale)
        }
        resources.updateConfiguration(configuration, resources.getDisplayMetrics())
        return context
    }
}