開關選項卡onNewIntent導致IllegalStateException

Question

如果我嘗試切換onNewIntent方法中的導航選項卡，My FragmentActivity（singleTop）給我IllegalStateException。

更具體地說，我的應用程序使用SherlockActionBar有三個選項卡，一個選項卡在接收到推送通知（和意圖被調用）時更新，如果應用程序暫停在另一個選項卡上，當我收到意圖時onNewIntent）我用bar.setSelectedNavigationItem（）將選項卡（以及片段）更改爲第三個選項卡，這導致了我的問題。如果應用在第三個標籤上暫停，則不會發生異常。

代碼：

@Override 
    public void onNewIntent(Intent intent) { 
     super.onNewIntent(intent); 
     Bundle bundle = intent.getExtras(); 
     if (bundle != null) { 
      bar.setSelectedNavigationItem(Utils.ORDER_STATUS_TAB_ID); 
     } else { 
     } 
    } 

推送通知意圖：

Intent notificationIntent = new Intent(context, 
      MainActivity.class); 
    notificationIntent.putExtra("orderUpdate", 
      new Gson().toJson(orderUpdate)); 
    notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK 
      | Intent.FLAG_ACTIVITY_SINGLE_TOP); 
    PendingIntent contentIntent = PendingIntent.getActivity(context, 0, 
      notificationIntent, 0); 

    notification.contentIntent = contentIntent; 

的TabListener方法（具有在堆棧跟蹤在管線56中的評論）

@Override 
    public void onTabSelected(Tab tab, FragmentTransaction ft) { 
     ft = activity.getSupportFragmentManager().beginTransaction(); 
     ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE); 
     if (mFragment == null) { 
      mFragment = Fragment 
        .instantiate(activity, mClass.getName(), mArgs); 
      ft.add(android.R.id.content, mFragment, tag); 
      ft.commit(); 
     } else { 
      ft.attach(mFragment); 
      ft.commit(); // line 56 
     } 

的詳細的異常：

07-12 20:06:40.959: E/AndroidRuntime(8639): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState 
07-12 20:06:40.959: E/AndroidRuntime(8639):  at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1299) 
07-12 20:06:40.959: E/AndroidRuntime(8639):  at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1310) 
07-12 20:06:40.959: E/AndroidRuntime(8639):  at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:541) 
07-12 20:06:40.959: E/AndroidRuntime(8639):  at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:525) 
07-12 20:06:40.959: E/AndroidRuntime(8639):  at com.wizche.ui.MyTabListener.onTabSelected(MyTabListener.java:56) 
07-12 20:06:40.959: E/AndroidRuntime(8639):  at com.actionbarsherlock.internal.app.ActionBarImpl.selectTab(ActionBarImpl.java:526) 
07-12 20:06:40.959: E/AndroidRuntime(8639):  at com.actionbarsherlock.internal.app.ActionBarImpl.setSelectedNavigationItem(ActionBarImpl.java:317) 
07-12 20:06:40.959: E/AndroidRuntime(8639):  at com.wizche.MainActivity.onNewIntent(MainActivity.java:205) 

Answer 1

我發現了一個這樣的修復，不管怎樣都很醜。我只是切換選項卡中的onResume而不是onNewIntent：

@Override 
    public void onResume() { 
     super.onResume(); 
     if(switchToTab){ 
      bar.setSelectedNavigationItem(Utils.ORDER_STATUS_TAB_ID); 
      switchToTab = false; 
     } 
    } 

而在onNewIntent（）我剛纔設置的switchToTab =真。我希望有人會有更好的解決方案。

Answer 2

我想你不應該在onTabSelected方法中調用commit。它已經由框架完成了。

哦，並使用您收到的交易，不要創建一個新的。

public void onTabSelected(Tab tab, FragmentTransaction ft) { 
    //remove the first line 
    //ft = activity.getSupportFragmentManager().beginTransaction(); 
    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE); 
    if (mFragment == null) { 
     mFragment = Fragment 
       .instantiate(activity, mClass.getName(), mArgs); 
     ft.add(android.R.id.content, mFragment, tag); 
     //not sure about this one 
     ft.commit(); 
    } else { 
     ft.attach(mFragment); 
     //not sure about this one neither 
     ft.commit(); // line 56 
    }