How to Change Language of App When User Selects Language

How to change language of app when user selects language?

It's excerpt for the webpage: http://android.programmerguru.com/android-localization-at-runtime/

It's simple to change the language of your app upon user selects it from list of languages. Have a method like below which accepts the locale as String (like 'en' for English, 'hi' for hindi), configure the locale for your App and refresh your current activity to reflect the change in language. The locale you applied will not be changed until you manually change it again.

public void setLocale(String lang) { 
    Locale myLocale = new Locale(lang); 
    Resources res = getResources(); 
    DisplayMetrics dm = res.getDisplayMetrics(); 
    Configuration conf = res.getConfiguration(); 
    conf.locale = myLocale; 
    res.updateConfiguration(conf, dm); 
    Intent refresh = new Intent(this, AndroidLocalize.class); 
    finish();
    startActivity(refresh); 
} 

Make sure you imported following packages:

import java.util.Locale; 
import android.os.Bundle; 
import android.app.Activity; 
import android.content.Intent; 
import android.content.res.Configuration; 
import android.content.res.Resources; 
import android.util.DisplayMetrics; 

add in manifest to activity android:configChanges="locale|orientation"

How to change the language of the app when THE USER selects the language?

I would suggest to pass the language name as an intent extra in the first activity and get it in the second activity and update the language accordingly. Consider the following

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // findViewbyId here for button
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, OtherActivity.class);
                intent.putExtra("lang", "fr");
                startActivity(intent);
            }
        });
    }
}

and in the other activity

public class OtherActivity extends AppCompatActivity {

    @Override
    private void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        String lang = getIntent().getStringExtra("lang") == null ? getIntent().getStringExtra("lang") : "en";

        // assuming this is the method you have to call to change the language
        changeLang(en);
    } 
}

Hope this helps.

How to change the application language by user choice?

Although its not recommended to use separate language for your app other than the Android system's . But you can still change it .

Below is the code :

private void setLocale (String localeCode , Bundle b ){
    Log.d(TAG+"set location function: "+localeCode);
    locale = new Locale(localeCode);
    Locale.setDefault(locale);
    Configuration config = new Configuration();
    config.locale = locale;
    getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
    getApplicationContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
    UserDetail.this.getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
    onCreate(null);
}

Use this method call on some user trigger:

setLocale("en-us",savedInstanceStat); // for english
setLocale("ar",savedInstanceStat); // for arabic

To learn more about android locals:
http://www.icanlocalize.com/site/tutorials/android-application-localization-tutorial/

Language switching inside app android

You can extend Application class (you have to declare it in the manifest as well) and put something like this in it.

Whenever you want to change language you can then call

((App)getApplicationContext()).changeLang(lang);

from within your activity.
R.string.locale_lang is just a key which is stored in strings.xml for shared preferences

public class App extends Application {

    private Locale locale = null;

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        if (locale != null) {
            Locale.setDefault(locale);
            Configuration config = new Configuration(newConfig);
            config.locale = locale;
            getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
        }
    }

    @Override
    public void onCreate() {
        super.onCreate();
        SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
        String lang = settings.getString(getString(R.string.locale_lang), "");
        changeLang(lang); 
    }

    public void changeLang(String lang) {
        Configuration config = getBaseContext().getResources().getConfiguration();
        if (!"".equals(lang) && !config.locale.getLanguage().equals(lang)) {

            Editor ed = PreferenceManager.getDefaultSharedPreferences(this).edit();
            ed.putString(getString(R.string.locale_lang), lang);
            ed.commit();

            locale = new Locale(lang);
            Locale.setDefault(locale);
            Configuration conf = new Configuration(config);
            conf.locale = locale;
            getBaseContext().getResources().updateConfiguration(conf, getBaseContext().getResources().getDisplayMetrics());
        }
    }

    public String getLang(){
        return PreferenceManager.getDefaultSharedPreferences(this).getString(this.getString(R.string.locale_lang), "");
    }



}

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