import android.animation.ValueAnimator;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.view.animation.AccelerateInterpolator;

public class AnimatedColorDrawable extends ColorDrawable {

    private int animationDuration;
    private int colorCurrent;
    private int colorOrigin;
    private ValueAnimator animator;

    public AnimatedColorDrawable(int colorOrigin, int animationDuration) {
        this.colorOrigin = colorOrigin;
        this.colorCurrent = colorOrigin;
        this.animationDuration = animationDuration;
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.drawColor(colorCurrent);
    }

    public void setColorAnimated(int colorFinal) {
        setColorAnimated(colorFinal, 0);
    }

    public void setColorAnimated(final int colorFinal, int startDelay) {
        this.colorOrigin = colorCurrent;
        if (colorOrigin != colorFinal) {
            if (animator != null) {
                animator.cancel();
            }

            final int rOrigin = Color.red(colorOrigin);
            final int gOrigin = Color.green(colorOrigin);
            final int bOrigin = Color.blue(colorOrigin);
            final int rFinal = Color.red(colorFinal);
            final int gFinal = Color.green(colorFinal);
            final int bFinal = Color.blue(colorFinal);

            animator = ValueAnimator.ofFloat(0f, 1.0f);
            animator.setDuration(animationDuration);
            animator.setStartDelay(startDelay);
            animator.setInterpolator(new AccelerateInterpolator());
            animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    float progress = (float) animation.getAnimatedValue();
                    colorCurrent = Color.rgb((int) (rOrigin + (rFinal - rOrigin) * progress), (int) (gOrigin + (gFinal - gOrigin) * progress), (int) (bOrigin + (bFinal - bOrigin) * progress));
                    invalidateSelf();
                }
            });
            animator.start();
        }
    }

}