Android 旋转动画

public class XuanzhuandonghuaActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);//       Animation anim = AnimationUtils.loadAnimation(this, R.anim.a);//       LinearInterpolator lir = new LinearInterpolator();//       anim.setInterpolator(lir);//       findViewById(R.id.imageView1).startAnimation(anim);        //设置为匀速          LinearInterpolator lin = new LinearInterpolator();          Animation am = new RotateAnimation ( 0, +360,          Animation.RELATIVE_TO_SELF, 0.5f,          Animation.RELATIVE_TO_SELF, 0.5f );              // 动画开始到结束的执行时间(1000 = 1 秒)              am. setDuration ( 1000 );              // 动画重复次数(-1 表示一直重复)              am. setRepeatCount ( -1 );              am.setRepeatCount(Animation.INFINITE);              am.setInterpolator(lin);              // 图片配置动画 //           progressImage. setAnimation (am); //           am. startNow ();             findViewById(R.id.imageView1).startAnimation(am);    }}