This answer is useful to set the navigation be open from right to left, but it has no solution to set its icon to be right side. This code can fix it. If you give it the drawer as its first param and ViewCompat.LAYOUT_DIRECTION_RTL as its second param, the entier layout will be set to RTL. It is a quick and simple solution, but I don't think it can be a correct solution for who that want to only set the menu to be opened from right to left and set its icon to be on right side. (Although, it's depended to your purpose.) However, I suggest giving the toolbar instead of the drawer. In this way just the toolbar has become RTL. So I think the combination of these 2 answers can exactly do what you want.
According to these descriptions, your code should be like this:
(Add these lines to onCreate method)
final DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); // Set it final to fix the error that will be mention below.
ViewCompat.setLayoutDirection(toolbar, ViewCompat.LAYOUT_DIRECTION_RTL);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (drawer.isDrawerOpen(Gravity.RIGHT))
drawer.closeDrawer(Gravity.RIGHT);
else
drawer.openDrawer(Gravity.RIGHT);
}
});
Notice that you should make drawer final, otherwise you will get this error:
Variable 'drawer' is accessed from within inner class, needs to be declared final
And don't forget to use end instead of start in onNavigationItemSelected method:
drawer.closeDrawer(GravityCompat.END);
and in your activity_main.xml
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
tools:openDrawer="end">
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_gravity="end"/>
</android.support.v4.widget.DrawerLayout>