Android context.getResources.updateConfiguration() deprecated

Question

Just recently context.getResources().updateConfiguration() has been deprecated in Android API 25 and it is advised to use context.createConfigurationContext() instead.

Answer 1

Inspired by Calligraphy & Mourjan & myself, i created this.

first you must create a subclass of Application:

public class MyApplication extends Application {
    private Locale locale = null;

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

        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);

        Configuration config = getBaseContext().getResources().getConfiguration();

        String lang = preferences.getString(getString(R.string.pref_locale), "en");
        String systemLocale = getSystemLocale(config).getLanguage();
        if (!"".equals(lang) && !systemLocale.equals(lang)) {
            locale = new Locale(lang);
            Locale.setDefault(locale);
            setSystemLocale(config, locale);
            updateConfiguration(config);
        }
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        if (locale != null) {
            setSystemLocale(newConfig, locale);
            Locale.setDefault(locale);
            updateConfiguration(newConfig);
        }
    }

    @SuppressWarnings("deprecation")
    private static Locale getSystemLocale(Configuration config) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            return config.getLocales().get(0);
        } else {
            return config.locale;
        }
    }

    @SuppressWarnings("deprecation")
    private static void setSystemLocale(Configuration config, Locale locale) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            config.setLocale(locale);
        } else {
            config.locale = locale;
        }
    }

    @SuppressWarnings("deprecation")
    private void updateConfiguration(Configuration config) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            getBaseContext().createConfigurationContext(config);
        } else {
            getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
        }
    }
}

then you need set this to your AndroidManifest.xml application tag:

and add this to your AndroidManifest.xml activity tag.

note that pref_locale is a string resource like this:

fa

and hardcode "en" is default lang if pref_locale is not setted