Android 创建片段时出现DalvikVM异常

我需要为一个选项卡创建一个片段，我的程序崩溃了。我想这是我犯的一个简单的错误。必须与我的

fragTab1

这就是我得到的：

Pick [Android Application]  
<terminated>Pick [Android Application]  
<disconnected>DalvikVM [localhost:8600] 
Pick [Android Application]  
DalvikVM [localhost:8600] (may be out of synch) 
    Thread [<1> main] (Suspended (exception RuntimeException))  
        <VM does not provide monitor information>   
        ActivityThread.performLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 2295    
        ActivityThread.handleLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 2349 
        ActivityThread.access$700(ActivityThread, ActivityThread$ActivityClientRecord, Intent) line: 159    
        ActivityThread$H.handleMessage(Message) line: 1316  
        ActivityThread$H(Handler).dispatchMessage(Message) line: 99 
        Looper.loop() line: 137 
        ActivityThread.main(String[]) line: 5419    
        Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
        Method.invoke(Object, Object...) line: 525  
        ZygoteInit$MethodAndArgsCaller.run() line: 1187 
        ZygoteInit.main(String[]) line: 1003    
        NativeStart.main(String[]) line: not available [native method]  
    Thread [<10> Binder_2] (Running) (may be out of synch)  
    Thread [<9> Binder_1] (Running) (may be out of synch)   

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你能上传有问题的错误日志吗？我上传了，对不起，我来晚了：-）请发布一个更完整的堆栈跟踪。您的活动可能无法访问ActionBar，但我无法从单个错误行判断。您应该上传完整的错误日志。有时，一行错误并没有多大帮助。完成！它突出显示了这一行，这就是我复制这一行的原因

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_app_launch);

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment())
                .commit();
    }

    ActionBar actionbar = getSupportActionBar();
    actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    actionbar.setTitle(R.string.app_name);

    ActionBar.Tab fragTab1 = actionbar.newTab().setText(R.string.tabBar_1);
    Fragment fragmentQuiz = new Fragment();
    fragmentQuiz.getLayoutInflater(savedInstanceState).inflate(R.layout.fragment_app_launch, null);
    fragTab1.setTabListener(new TabListener(fragmentQuiz));
    actionbar.addTab(fragTab1);

    ActionBar.Tab fragTab2 = actionbar.newTab().setText(R.string.tabBar_2);
    Fragment fragmentStatistics = new FragmentStatistics();
    fragTab2.setTabListener(new TabListener(fragmentStatistics));
    actionbar.addTab(fragTab2);

    /*ActionBar.Tab fragTab3 = actionbar.newTab().setText(R.string.tabBar_3);
    Fragment fragmentProVersion = new FragmentProVersion();
    fragTab3.setTabListener(new TabListener(fragmentProVersion));
    actionbar.addTab(fragTab3);*/

 }