change back arrow image in Actionbar with appcompat-v7

Question

I have an Actionbar from android.support.v7.widget.Toolbar. It has hamburger image with animation to back arrow, I want to change back arrow from &

Answer 1

There are at least half a dozen ways to do this, but probably the simplest and shortest is to use reflection to grab the ActionBarDrawerToggle's Drawable, and flip its direction.

This example wraps that functionality in a subclass, and should work no matter your ActionBar/Activity setup (provided the original class worked there in the first place).

public class FlippedDrawerToggle extends ActionBarDrawerToggle {
    public FlippedDrawerToggle(Activity activity, DrawerLayout drawerLayout,
        int openDrawerContentDescRes, int closeDrawerContentDescRes) {

        this(activity, drawerLayout, null,
            openDrawerContentDescRes, closeDrawerContentDescRes);
    }

    public FlippedDrawerToggle(Activity activity, DrawerLayout drawerLayout,
        Toolbar toolbar, int openDrawerContentDescRes, int closeDrawerContentDescRes) {

        super(activity, drawerLayout, toolbar,
             openDrawerContentDescRes, closeDrawerContentDescRes);

        try {
            Field sliderField = ActionBarDrawerToggle.class.getDeclaredField("mSlider");
            sliderField.setAccessible(true);
            DrawerArrowDrawable arrow = (DrawerArrowDrawable) sliderField.get(this);
            arrow.setDirection(DrawerArrowDrawable.ARROW_DIRECTION_RIGHT);
        }
        catch (NoSuchFieldException | IllegalAccessException e) {
            // Fail silently
        }
    }
}

This will only change the direction of the toggle's image. If you actually want the whole ActionBar/Toolbar to be flipped, you should instead change the layout's direction accordingly.