Android AnimationDrawable运行的几种方式

1.注意事项

2.第一种：在事件监听中start AnimationDrawable 下面一个例子举例 当一个视图树将要绘制时产生事件

AnimationDrawable ad；
ImageView iv = (ImageView) findViewById(R.id.animation_view);
iv.setBackgroundResource(R.drawable.animation);
ad = (AnimationDrawable) iv.getBackground();
iv.getViewTreeObserver().addOnPreDrawListener(opdl);

OnPreDrawListener opdl=new OnPreDrawListener(){
@Override
public boolean onPreDraw() {
ad.start();
return true; //注意此行返回的值
}

};

3.第二种方式启动动画：（在Activity启动时会自动运行动画）

ImageView image = (ImageView) findViewById(R.id.animation_view);
image.setBackgroundResource(R.anim.oldsheep_wait);
animationDrawable = (AnimationDrawable) image.getBackground();
RunAnim runAnim=new RunAnim();
runAnim.execute("");

class RunAnim extends AsyncTask<String, String, String>
{
@Override
protected String doInBackground(String... params)
{
if (!animationDrawable.isRunning())
{
animationDrawable.stop();
animationDrawable.start();
}
return "";
}
}

4.第三种方式启动动画：（在Activity启动时会自动运行动画）

ImageView image = (ImageView) findViewById(R.id.animation_view);
image.setBackgroundResource(R.anim.oldsheep_wait);
animationDrawable = (AnimationDrawable) image.getBackground();
image.post(new Runnable()
{
@Override
public void run()
{
animationDrawable.start();
}
});

5.第四种方式启动动画：（在Activity启动时会自动运行动画）

ImageView image = (ImageView) findViewById(R.id.animation_view);
image.setBackgroundResource(R.anim.oldsheep_wait);
animationDrawable = (AnimationDrawable) image.getBackground();

@Override
public void onWindowFocusChanged(boolean hasFocus)
{
animationDrawable.start();
super.onWindowFocusChanged(hasFocus);
}