在onCreate方法加入这些代码，布局xml定义了Id为image的ImageButton。
显示效果就只有icon_avi.png这张图片，第二种图片icon_file_document.png没播放到，为什么？
ImageButton imageButton =
(ImageButton)findViewById(R.id.image);
AnimationDrawable imageButtonAnimation = new
AnimationDrawable();
imageButtonAnimation.addFrame(getResources().getDrawable(R.drawable.icon_avi),
300);
imageButtonAnimation.addFrame(getResources().getDrawable(R.drawable.icon_file_document),
300);
imageButton.setImageDrawable(imageButtonAnimation);
imageButtonAnimation.setVisible(true, false);
imageButtonAnimation.start();
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