How to resume and pause ObjectAnimator in Android for API Levels below 19?

elizabetht picture elizabetht · Aug 10, 2014 · Viewed 9.7k times · Source

I am aware that API level 19 supports pause() and resume() on ObjectAnimators. But in my project at API level 14, I have an ObjectAnimator which is applied to an Image view to rotate it. I want to pause the animation provided by the ObjectAnimator on touch and resume it from the place where the image view was (before touch down).

So I attempted to save the current play time and cancel the object animator on my stopAnimation() function.

private void stopAnimation(){
        currentTime = mGlobeAnimator.getCurrentPlayTime();
        mGlobeAnimator.cancel();
    }

In the startAnimation() function, I recreate the animator, set its target to the image view, set the saved play time and start it.

private void startAnimation(Context context, View view, float startAngle) {
        ObjectAnimator globeAnimatorClone = (ObjectAnimator)AnimatorInflater.loadAnimator(context, R.animator.rotate_globe);
        globeAnimatorClone.setTarget(mImageView);
        globeAnimatorClone.setCurrentPlayTime(currentTime);
        globeAnimatorClone.start();
}

This does not work. Would anybody help please with any pointers to pause and resume animation provided by animator for API level before 19?

Answer

elizabetht picture elizabetht · Aug 11, 2014

I think I got it working by starting the animator and then setting the currentPlayTime(). The documentation clearly tells (which I just stumbled upon) that if the animation has not been started, the currentPlayTime set using this method will not advance the forward!

Sets the position of the animation to the specified point in time. This time should be between 0 and the total duration of the animation, including any repetition. If the animation has not yet been started, then it will not advance forward after it is set to this time; it will simply set the time to this value and perform any appropriate actions based on that time. If the animation is already running, then setCurrentPlayTime() will set the current playing time to this value and continue playing from that point. http://developer.android.com/reference/android/animation/ValueAnimator.html#setCurrentPlayTime(long)

private void stopAnimation(){
    mCurrentPlayTime = mRotateAntiClockwiseAnimator.getCurrentPlayTime();
    mRotateAntiClockwiseAnimator.cancel();
}

private void startAnimation() {
        mRotateAntiClockwiseAnimator.start();
        mRotateAntiClockwiseAnimator.setCurrentPlayTime(mCurrentPlayTime);
}