老师，这是我的代码。我启动模拟器以后，发现第一次旋转结束以后，拨杆能够回到正确位置；可是，第二次旋转结束以后，拨杆就不动了，相当于没有执行mBarOut函授，求解

package com.My_Music.Music_Guess.ui;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.animation.Animation;

import android.view.animation.Animation.AnimationListener;

import android.view.animation.AnimationUtils;

import android.view.animation.LinearInterpolator;

import android.widget.ImageButton;

import android.widget.ImageView;

public class MainActivity extends Activity {

//唱片旋转动画定义

private Animation mPanAnim;    //圆盘动画

private LinearInterpolator mPanLin;

private Animation mBarInAnim;    //拨杆（开启唱片旋转）

private LinearInterpolator mBarInLin;

private Animation mBarOutAnim;   //拨杆（结束唱片旋转）

private LinearInterpolator mBarOutLin;

    //唱片旋转动画定义结束

private ImageButton mStarPlay;  //唱片开启按钮

private ImageView mViewPan;  //盘片

private ImageView mViewBar;  //拨杆

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

 //盘片部分

        // 初始化圆盘动画

        mPanAnim=AnimationUtils.loadAnimation(this,R.anim.pan_rotate);

        mPanLin=new LinearInterpolator();

        mPanAnim.setInterpolator(mPanLin);

        mPanAnim.setFillAfter(true);

        mPanAnim.setAnimationListener(new AnimationListener(){

@Override

public void onAnimationEnd(Animation arg0) {

// TODO Auto-generated method stub

mViewBar.startAnimation(mBarOutAnim);

}

@Override

public void onAnimationRepeat(Animation arg0) {

// TODO Auto-generated method stub

}

@Override

public void onAnimationStart(Animation arg0) {

// TODO Auto-generated method stub

}});

        //初始化拨杆（开始）动画

        mBarInAnim=AnimationUtils.loadAnimation(this,R.anim.bar_in);

        mBarInLin=new LinearInterpolator();

        mBarInAnim.setInterpolator(mBarInLin);

        mBarInAnim.setFillAfter(true);

        mBarInAnim.setAnimationListener(new AnimationListener(){

@Override

public void onAnimationEnd(Animation arg0) {

// TODO Auto-generated method stub

mViewPan.setAnimation(mPanAnim);

}

@Override

public void onAnimationRepeat(Animation arg0) {

// TODO Auto-generated method stub

}

@Override

public void onAnimationStart(Animation arg0) {

// TODO Auto-generated method stub

}});

        //初始化拨杆（结束）动画

        mBarOutAnim=AnimationUtils.loadAnimation(this, R.anim.bar_out);

        mBarOutLin=new LinearInterpolator();

        mBarOutAnim.setInterpolator(mBarOutLin);

        mBarOutAnim.setFillAfter(true);

        mBarOutAnim.setAnimationListener(new AnimationListener(){

@Override

public void onAnimationEnd(Animation arg0) {

// TODO Auto-generated method stub

}

@Override

public void onAnimationRepeat(Animation arg0) {

// TODO Auto-generated method stub

}

@Override

public void onAnimationStart(Animation arg0) {

// TODO Auto-generated method stub

}});

       mStarPlay=(ImageButton)findViewById(R.id.pan_play);

       mViewPan=(ImageView)findViewById(R.id.imageView2);

       mViewBar=(ImageView)findViewById(R.id.imageView5);

       mStarPlay.setOnClickListener(new OnClickListener(){ //当点击

@Override

public void onClick(View arg0) {

StartPlayButton();

}});

    }

    private void StartPlayButton()

    {

    mViewBar.startAnimation(mBarInAnim);

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }

}