Strange screen flash on first animation (ObjectAnimator)

Question

Strange screen flash on first animation (ObjectAnimator)

I have a little annoying behavior on my sliding animation.

I made a video and posted it on YouTube . I couldn't find any app that can make on-screen video from a non-rooted phone, so I had to do it like this :)

NOTE : take a close look at the first animation, starting at 00:07 you will notice a small flash ... this only happens the first time, I start the animation ...

Then, in the video, I run the animation multiple times and there is no flash and everything runs smoothly.

Here is the code I'm using:

private void slideDown(){

    // Here I calculate the height of a header and the ListView (That is not populated in the video, therefore - white and empty), as it will be different for different screen sizes
    float headerHeight = header.getHeight();
    float topicNameHeight = topHeader.getHeight()+1;
    float totalHeight = headerHeight+topicNameHeight;
    float listSize = listView.getHeight();

    int theSizeIWant = (int) (listSize+totalHeight);


    //slide down
    if (counter==0){
        listView.setPivotY(0);
        ObjectAnimator slideAnimation = ObjectAnimator.ofFloat(listView, "y",topicNameHeight);
        ObjectAnimator rotateAnimation = ObjectAnimator.ofFloat(btn_slider, "rotation",0f,180f);
        listView.setLayoutParams(new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, theSizeIWant));

        rotateAnimation.setDuration(800);
        slideAnimation.setDuration(800);

        slideAnimation.start();
        rotateAnimation.start();
        counter=1;
    }
    //slide up
    else{
        ObjectAnimator slideAnimation = ObjectAnimator.ofFloat(listView, "y",totalHeight);
        ObjectAnimator rotateAnimation = ObjectAnimator.ofFloat(btn_slider, "rotation",180f,360f);
        listView.setLayoutParams(new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (int)listSize));

        rotateAnimation.setDuration(800);
        slideAnimation.setDuration(800);

        slideAnimation.start();
        rotateAnimation.start();

        counter=0;
    }

}