how to make the default language for android app is Arabic not English and make
support RTL is the default? note : i add android:supportsRtl="true" in mainfast but that does not work
you need to add android:layoutDirection="rtl"
to all of your layouts to make them RTL by default.
Also, you should run Android Studio > Refactor > Add RTL support where possible
to make your layouts RTL friendly.