从意图处理程序提交片段事务时出错

我试图写一个简单的音乐播放器，并面对这样的问题。在我的UI中，我有几个片段，分别用于显示歌曲的不同模式（例如，所有音乐，选定文件夹中的音乐，播放列表中的音乐等）。我也有播放音乐的服务。

当用户关闭处于播放状态的播放器时，我想保存UI状态（即当前显示的片段），并在再次打开播放器后恢复该状态（如果用户关闭处于暂停状态的播放器，则不需要）。

为了保存状态，我使用Service上述的my 。在onDestroy()我的活动方法中，我将恢复所需的所有数据放入了intent和call中startService(intent)。服务将此数据保存到局部变量。在onCreate()我的活动方法中，我startService故意调用，其中包含保存状态的请求。在使用中，我将保存的数据用于意图并将其发送到Activity使用LocalBroadcastManager.getInstance(this).sendBroadcast(intent)方法。在BroadcastListener我的内部课堂中，我Activity收到了这个意图并提取了数据。看来还可以。

但是问题开始于当我尝试还原Fragments用户关闭播放器时显示的内容时。应用程序崩溃与unhandled exception.这里是堆栈：

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
        at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1377)
        at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1395)
        at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:637)
        at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:616)
        at com.borune.test.MainActivity.switchFragments(MainActivity.java:58)
        at com.borune.test.MainActivity$MyServiceListener.onReceive(MainActivity.java:102)
        at android.support.v4.content.LocalBroadcastManager.executePendingBroadcasts(LocalBroadcastManager.java:297)
        at android.support.v4.content.LocalBroadcastManager.access$000(LocalBroadcastManager.java:46)
        at android.support.v4.content.LocalBroadcastManager$1.handleMessage(LocalBroadcastManager.java:116)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5032)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
        at dalvik.system.NativeStart.main(Native Method)

我已经搜寻了这个例外，但是所有提议的解决方案都无法解决我的问题。我写了一个简单的项目重复描述的问题。这是代码：

MainActivity.java：

public class MainActivity extends ActionBarActivity {

private int current_fragment;
private FragmentA fragmentA = null;
private FragmentB fragmentB = null;
private MyServiceListener myServiceListener;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    current_fragment = 1;
    switchFragments(null);
    myServiceListener = new MyServiceListener();

    LocalBroadcastManager.getInstance(this).registerReceiver(myServiceListener,new IntentFilter(MyService.RESPONSE_RESTORE));

    requestState();
}

public void switchFragments(View view) {
    switch(current_fragment) {
        case 1 : {
            if(fragmentA == null) {
                fragmentA = FragmentA.newInstance();
            }

            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            transaction.replace(R.id.container, fragmentA);
            current_fragment = 1;
            transaction.commit();

            current_fragment = 2;

            break;
        }
        case 2 : {
            if(fragmentB == null) {
                fragmentB = FragmentB.newInstance();
            }

            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            transaction.replace(R.id.container, fragmentB);
            current_fragment = 1;
            transaction.commit();

            current_fragment = 1;

            break;
        }

    }
}

protected void onDestroy(){
    super.onDestroy();

    Log.d("log", "onDestroy() called, saving fragment number");
    Intent intent = new Intent(this,MyService.class);
    intent.setAction(MyService.SAVE_STATE);
    intent.putExtra(MyService.FRAGMENT_NUMBER,current_fragment);
    startService(intent);
}


private class MyServiceListener extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();

        if(action.equals(MyService.RESPONSE_RESTORE)) {
            current_fragment = intent.getIntExtra(MyService.FRAGMENT_NUMBER,-1);
            Log.d("log", "received fragment number, restoring now");
            switchFragments(null);
        }
    }
}

private void requestState() {
    Intent intent = new Intent(this,MyService.class);
    intent.setAction(MyService.REQUEST_RESTORE);
    startService(intent);
 }
 }

MyService.java

public class MyService extends Service {

public static final String REQUEST_RESTORE = "action.REQUEST_RESTORE";
public static final String RESPONSE_RESTORE = "action.RESPONSE_RESTORE";
public static final String SAVE_STATE = "action.SAVE_STATE";
public static final String FRAGMENT_NUMBER = "FRAGMENT_NUMBER";

private int fragment_number = -1;

public MyService() {
}

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    String action = intent.getAction();
    if(action.equals(REQUEST_RESTORE)) {
        if(fragment_number != -1)
            sendState();
    } else if (action.equals(SAVE_STATE)) {
        fragment_number = intent.getIntExtra(FRAGMENT_NUMBER,-1);
    }
    return START_NOT_STICKY;
}

private void sendState() {
    Intent intent = new Intent(RESPONSE_RESTORE);
    intent.putExtra(FRAGMENT_NUMBER,fragment_number);
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
 }
 }

在这个程序我有容器和布局Button有android:onClick="switchFragments"。关闭应用程序并再次打开后，我收到相同的异常。

谁能解释我，为什么会出现此错误以及如何解决呢？