Question

我有这个切换按钮，当它打开时，调用一个设置几个元素可见的动画方法。但是当我关闭它时，元素仍然可见，尽管相反的指令。如何让它们以同样的逻辑消失？我是否必须创建另一种方法？谢谢，这是代码：

 drum.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                key1.setVisibility(View.VISIBLE);
                key1.startAnimation(fadeInAnimation());

                key2.setVisibility(View.VISIBLE);
                key2.startAnimation(fadeInAnimation());

                key3.setVisibility(View.VISIBLE);
                key3.startAnimation(fadeInAnimation());


                rocking.setLooping(true);
                rocking.start();

                Toast.makeText(getApplicationContext(), "Rock and Rolling!", Toast.LENGTH_SHORT).show();
            } else {
                rocking.setLooping(false);
                key1.setVisibility(View.INVISIBLE);// These instrucions are ignored...
                key2.setVisibility(View.INVISIBLE);
                key3.setVisibility(View.INVISIBLE);

                Toast.makeText(getApplicationContext(), "Can't keep up? Try the tamborine!", Toast.LENGTH_SHORT).show();

            }
        }
    });

动画方法：

private Animation fadeInAnimation() {
Animation animation = new AlphaAnimation(0f, 1.0f);
animation.setDuration(1000); 
animation.setFillEnabled(true);
animation.setFillAfter(true);
return animation;
}

Answer 1

更改fadeInAnimation并传递一个布尔参数，如果为true则执行淡入淡出动画，否则淡出动画。代码示例如下。用法fadeInnimation（true）表示fadeIn动画，fadeAnimation（false）表示fadeOut动画。希望这会有所帮助。

private Animation fadeAnimation(boolean fadeIn) {

 Animation animation = null;
 if(fadeIn)
    animation = new AlphaAnimation(0f, 1.0f);
 else
    animation = new AlphaAnimation(1.0f, 0f);
 animation.setDuration(1000); 
 animation.setFillEnabled(true);
 animation.setFillAfter(true);
 return animation;

}

Answer 2

结帐以下代码

viewObject.animate()
            .alpha(0.0f)
            .setStartDelay(10000)
            .setDuration(2000)
            .setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    super.onAnimationEnd(animation);
                    // do your stuff if any, after animation ends
                }
            }).start();

Answer 3

View.setVisibility(View.INVISIBLE) does not work for animated view可能重复。只要即使取消动画也执行动画，也不会尊重可见性

如何用动画设置元素不可见？

3 个答案: