Android，setVisibility / animation问题

Question

I have a linearLayout that disappears when I hit a button, it comes back when I press the button again. But it does it so fast, it doesn't look nice. I do this via:

disappearView.setVisibility(View.GONE);

I would like to add some animation... If I just set visibity to invisible the space where the layout was is still there. So I tried this:

if (disappearView.getVisibility() == View.VISIBLE){
            Animation out = AnimationUtils.makeOutAnimation(this, true);
            disappearView.startAnimation(out);
            disappearView.setVisibility(View.INVISIBLE);
            disappearView.setVisibility(View.GONE);

        }
        else {
            Animation in = AnimationUtils.loadAnimation(this, android.R.anim.fade_in);
            disappearView.startAnimation(in);
            disappearView.setVisibility(View.VISIBLE);      
        }

This does the animation too fast and disappears. You can't see it at all. Do I need to use a thread to start gone after invisible is set...or a delay? Or is there a better way of doing all this?

Answer 1

I'm not sure exactly what you're trying to accomplish...do you want the LinearLayout to fade out over a little bit of time rather than instantly disappear? And then once it fades out be removed from the parent via View.GONE?

If so, you can use an AlphaAnimation for the fade out and then attach a listener like EvZ posted:

AlphaAnimation fadeOutAnimation = new AlphaAnimation(1, 0); // start alpha, end alpha
fadeOutAnimation.setDuration(1000); // time for animation in milliseconds
fadeOutAnimation.setFillAfter(true); // make the transformation persist
fadeOutAnimation.setAnimationListener(new AnimationListener() {         
    @Override
    public void onAnimationEnd(Animation animation) {
        linearLayout.setVisibility(View.GONE);
    }

    @Override
    public void onAnimationRepeat(Animation animation) { }

    @Override
    public void onAnimationStart(Animation animation) { }
});

linearLayout.setAnimation(fadeOutAnimation);

Answer 2

您可以尝试使用onAnimationEnd ： Animation.AnimationListener