Android 两张照片相互淡出

<?xml version="1.0" encoding="UTF-8"?>
<transition xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/badtz1"/>
<item android:drawable="@drawable/badtz2"/>
</transition>

public class Draw01Activity extends Activity {
/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Resources res = getResources();
TransitionDrawable transition = (TransitionDrawable) res.getDrawable(R.drawable.stylr);
ImageView mImageView = (ImageView) findViewById(R.id.imageView1);
mImageView.setImageDrawable(transition);
//2秒开始转换
transition.startTransition(2000);
}