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Changing the language of the android application doesn't work properly after selecting another language

January 27, 2023

My application that the user can change the language of the application.
Currently, my application supports 5 languages.
But when the user chooses another language, the language of the app will still be English.

Resources res = context.getResources();
DisplayMetrics dm = res.getDisplayMetrics();
android.content.res.Configuration conf = res.getConfiguration();
conf.setLocale(new Locale(language_code.toLowerCase()));

Each time the application is launched, the selected language is set first.
However, there is no change in the language!
Of course, if i change the language before using Context.getString(R.string.name) every time, the selected language will be changed successfully!!.

>Solution :

You must make these changes to the attachBaseContext function when you run each Activity.

public Context createConfiguration(Context context, String lan) {
    Locale locale = new Locale(lan);
    Configuration configuration = new Configuration(context.getResources().getConfiguration());
    configuration.setLocale(locale);
    return context.createConfigurationContext(configuration);
}

@Override
protected void attachBaseContext(Context newBase) {
    super.attachBaseContext(createConfiguration(newBase, "en"/*LANGUAGE_SELECTED*/)));
}