为什么我的Android动画不能调用onAnimationEnd?

我的动画工作,当线程结束时,下一个屏幕的意图激发,但它不会从动画结束时激发。我把所有的 AnimationListener's

public class PromoActivity extends Activity implements AnimationListener {
    protected boolean _active = true;
    protected int _splashTime = 5000; // time to display the splash screen in ms

    private static final float ROTATE_FROM = 0.0f;
    private static final float ROTATE_TO = -10.0f * 360.0f;// 3.141592654f * 32.0f;
    private static final String TAG = "PromoActivity";

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Thread promoThread = new Thread() {
            @Override
            public void run() {
                try {
                    ImageView favicon = (ImageView) findViewById(R.id.favicon);

                    RotateAnimation r; // = new RotateAnimation(ROTATE_FROM, ROTATE_TO);
                    r = new RotateAnimation(ROTATE_FROM, ROTATE_TO, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
                    r.setDuration((long) 2*1500);
                    favicon.startAnimation(r);

                    RotateAnimation q;
                    q = new RotateAnimation(ROTATE_FROM, -ROTATE_TO, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
                    q.setDuration((long) 2*1500);
                    q.setRepeatCount(0);
                    TextView mobiText = (TextView) findViewById(R.id.logotext_mobi);
                    mobiText.startAnimation(q);

                    TextView dawgText = (TextView) findViewById(R.id.logotext_bob);
                    dawgText.startAnimation(q);

                    int waited = 0;
                    while (_active && (waited < _splashTime)) {
                        sleep(100);
                        if (_active) {
                            waited += 100;
                        }
                    }
                } catch (InterruptedException ex) {

                } finally {
                    finish();
                    startActivity(new Intent("com.mobibob.promo.AboutActivity"));
                    stop();
                }
            }
        };
        promoThread.start();

    }

    @Override
    public void onAnimationEnd(Animation animation) {
        Log.d(TAG, "onAnimationEnd");
        startActivity(new Intent("com.mobibob.promo.AboutActivity"));
    }
}