Android基础知识之frame动画效果

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
 android:oneshot="false"><!-- true表示只播放一次，false表示无限循环播放 -->
 <item android:drawable="@drawable/girl_1" android:duration="100" />
 <item android:drawable="@drawable/girl_2" android:duration="100" />
 <item android:drawable="@drawable/girl_3" android:duration="100" />
 <item android:drawable="@drawable/girl_4" android:duration="100" />
 <item android:drawable="@drawable/girl_5" android:duration="100" />
 <item android:drawable="@drawable/girl_6" android:duration="300" />
 <item android:drawable="@drawable/girl_7" android:duration="400" />
 <item android:drawable="@drawable/girl_8" android:duration="300" />
 <item android:drawable="@drawable/girl_9" android:duration="100" />
 <item android:drawable="@drawable/girl_10" android:duration="100" />
 <item android:drawable="@drawable/girl_11" android:duration="100" />
</animation-list>

public class MainActivity extends Activity {

 private ImageView iv;
 private AnimationDrawable ad;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  iv = (ImageView) this.findViewById(R.id.iv);
//  iv.setBackgroundResource(R.anim.frame);
//  ad = (AnimationDrawable) iv.getBackground();
  //上面两句，可以用下面两句代替，效果是一样的
  iv.setImageResource(R.anim.frame);
  ad = (AnimationDrawable) iv.getDrawable();
 }
 public void start(View v){
  //如果ad正在运行，就先让它停止下来
  if(ad.isRunning())
   ad.stop();
  ad.start();
 }
}