Reversing an Animation

Question

I have an ImageView that gets animated when it is added to a layout. When it is removed, I want to reverse the same animation.

Is there a way to reverse an animation

Answer 1

Based on pcans idea, you can reverse any interpolator, not just linear.

class ReverseInterpolator implements Interpolator{
    private final Interpolator delegate;

    public ReverseInterpolator(Interpolator delegate){
        this.delegate = delegate;
    }

    public ReverseInterpolator(){
        this(new LinearInterpolator());
    }

    @Override
    public float getInterpolation(float input) {
        return 1 - delegate.getInterpolation(input);
    }
}

Usage

ReverseInterpolator reverseInterpolator = new ReverseInterpolator(new AccelerateInterpolator())
myAnimation.setInterpolator(reverseInterpolator);