android - Animate ActionBarDrawerToggle icon programmatically

Question

I want to animate the drawer icon from a burger to an arrow and vice versa manually, not only when drawer is being dragged, is it possible? I'm using support library appcompat-v7:21.

Also I can't find the source code of android.support.v7.app.ActionBarDrawerToggle which would helpful.

Answer 1

I found a way to animate the icon with a simple ValueAnimator and .onDrawerSlide method.

    ValueAnimator anim = ValueAnimator.ofFloat(start, end);
    anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator valueAnimator) {
            float slideOffset = (Float) valueAnimator.getAnimatedValue();
            drawerToggle.onDrawerSlide(drawerLayout, slideOffset);
        }
    });
    anim.setInterpolator(new DecelerateInterpolator());
    anim.setDuration(300);
    anim.start();

But maybe there is a better solution.