Android : Change entire app layout directions programmatically

Question

How can I change entire app layout direction to RTL? I am writing an app that user must select it's language in first launch and the layout should change based on user selection to RTL or remains LTR. I used to add android:supportsRtl="true" to the AndroidManifest and android:layoutDirection="rtl" for each layout but this approach have some problems like below :

One problem is when I change the direction to RTL the ActionBar home icon or navigation button (when home as up is enabled) remains LRT and just move to the right.

I also tried to change direction programmatically and the result was the same :

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1){
            getWindows().getDecorView().setLayoutDirection(View.LAYOUT_DIRECTION_RTL);
        }

Is there any way to force all activities to become RTL at once or we should set direction in each activity separately?

Answer 1

You can use this piece of code while your application's minSdk >= 17.

I used fa for Farsi, you can use other rtl language.

Configuration configuration = getResources().getConfiguration();
configuration.setLayoutDirection(new Locale("fa"));
getResources().updateConfiguration(configuration, getResources().getDisplayMetrics());