After the screen rotation, the language of my application will be changed

Question

I have created a bilingual (having two languages) android application. I have inserted my resource strings in two files:

For Persian language (default)
values/strings_locale.xml‬

For English language 
values-en/strings_locale.xml‬

I my first launching Activity I have inserted the following code:

Configuration c = new Configuration(this.getResources().getConfiguration());
c.locale = new Locale("fa_IR");

this.getResources().updateConfiguration(c, this.getResources().getDisplayMetrics());

So after this code, my default language will be Persian and all of strings in all of Activities are shown in Persian language correctly.

But the problem is when the screen of the device is rotated, all of the strings are shown in English and it also happens for all other Activities! And I have to close and reopen my application.

Why this happens and how I can solve this problem?

Answer 1

You can make class which extends Application. There you can override one method which gets called everytime you change configuration (example when screen orientation gets changed).

Something like:

public class MyApplication extends Application {
    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        setLocale();
    }

    private void setLocale() {
        Locale locale = new Locale("fa_IR");
        Locale.setDefault(locale);
        Configuration config = new Configuration();
        config.locale = locale;
        getBaseContext().getResources().updateConfiguration(config,
              getBaseContext().getResources().getDisplayMetrics());
    }
}

And dont forget to declare it in the manifest: example of Application class

In AndroidManifest.xml:

<application
    android:name="com.blaablaa.bumbam.MyApplication"
    ...