Android的片段旋轉導致崩潰

Question

我有一個非常溫情的android應用程序，我正在努力。

我有一個導航抽屜，根據用戶選擇的內容交換片段。

然而，當屏幕被旋轉的應用程序崩潰，此錯誤：

java.lang.RuntimeException: Unable to destroy activity {MainActivity}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState 

我的片段的所有擴展的基類「BaseFragment」：

public class BaseFragment extends Fragment{ 
    protected FragmentManager fragmentManager; 

    public void setFragmentManager(FragmentManager fragmentManager){ 
     this.fragmentManager=fragmentManager; 
    } 
    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
    } 
    @Override 
    public void onDestroyView() { 
     super.onDestroyView(); 
     Fragment f = (Fragment) fragmentManager 
       .findFragmentById(R.id.container); 
     if (f != null) 
      fragmentManager.beginTransaction().remove(f).commit(); 
    } 

} 

我的默認片段「NewsFeedFragment」長相像這樣：

public class NewsFeedFragment extends BaseFragment{ 

    /** 
    * Returns a new instance of this fragment for the given section 
    * number. 
    */ 
    public static NewsFeedFragment newInstance(int sectionNumber) { 
     NewsFeedFragment fragment = new NewsFeedFragment(); 
     return fragment; 
    } 

    public NewsFeedFragment() { 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     setFragmentManager(getFragmentManager()); 
     View rootView = inflater.inflate(R.layout.fragment_news_feed, container, false);; 
     return rootView; 
    } 
} 

我的主要活動如下所示：

public class MainActivity extends BaseActivity { 

    /** 
    * Fragment managing the behaviors, interactions and presentation of the navigation drawer. 
    */ 
    private NavigationDrawerFragment mNavigationDrawerFragment; 

    /** 
    * Used to store the last screen title. For use in {@link #restoreActionBar()}. 
    */ 
    private CharSequence mTitle; 

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

     //getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.titlebar); 
     ActionBar actionBar=getActionBar(); 

     mNavigationDrawerFragment = (NavigationDrawerFragment) 
       getFragmentManager().findFragmentById(R.id.navigation_drawer); 
     mTitle = getTitle(); 

     // Set up the drawer. 
     mNavigationDrawerFragment.setUp(
       R.id.navigation_drawer, 
       (DrawerLayout) findViewById(R.id.drawer_layout)); 

    } 



    public void onSectionAttached(int number) { 
     switch (number) { 
      case 1: 
       mTitle = getString(R.string.news_feed_activity); 
       break; 
      case 2: 
       mTitle = getString(R.string.friends_activity); 
       break; 
      case 3: 
       mTitle = getString(R.string.events_activity); 
       break; 
      case 4: 
       mTitle = getString(R.string.locations_activity); 
       break; 
      case 5: 
       mTitle = getString(R.string.settings_activity); 
       break; 
     } 
    } 

    public void restoreActionBar() { 
     ActionBar actionBar = getActionBar(); 
     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); 
     actionBar.setDisplayShowTitleEnabled(true); 
     actionBar.setTitle(""); 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     if (!mNavigationDrawerFragment.isDrawerOpen()) { 
      // Only show items in the action bar relevant to this screen 
      // if the drawer is not showing. Otherwise, let the drawer 
      // decide what to show in the action bar. 
      getMenuInflater().inflate(R.menu.news_feed, menu); 
      restoreActionBar(); 
      return true; 
     } 
     return super.onCreateOptionsMenu(menu); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     //if (id == R.id.action_settings) { 
     // return true; 
     //} 
     return super.onOptionsItemSelected(item); 
    } 


} 

正如我所說的這個錯誤只發生在旋轉。

以下是完整的錯誤輸出流：

EXCEPTION: main 
    Process: APP ID, PID: 8399 
    java.lang.RuntimeException: Unable to destroy activity {MainActivity}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState 
      at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3497) 
      at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515) 
      at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3715) 
      at android.app.ActivityThread.access$900(ActivityThread.java:135) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:136) 
      at android.app.ActivityThread.main(ActivityThread.java:5017) 
      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:779) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState 
      at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1323) 
      at android.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1341) 
      at android.app.BackStackRecord.commitInternal(BackStackRecord.java:597) 
      at android.app.BackStackRecord.commit(BackStackRecord.java:575) 
      at uk.co.stephen_robinson.uni.lufelf.NewsFeedFragment.onDestroyView(NewsFeedFragment.java:43) 
      at android.app.Fragment.performDestroyView(Fragment.java:1898) 
      at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:954) 
      at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062) 
      at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1044) 
      at android.app.FragmentManagerImpl.dispatchDestroy(FragmentManager.java:1881) 
      at android.app.Activity.performDestroy(Activity.java:5402) 
      at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1117) 
      at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3484) 
            at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515) 
            at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3715) 
            at android.app.ActivityThread.access$900(ActivityThread.java:135) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:136) 
            at android.app.ActivityThread.main(ActivityThread.java:5017) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:515) 

我真的很感激一些這方面的幫助。

在此先感謝，

詹姆斯。

Answer 1

你得到你的錯誤，因爲你不能做到這一點...

@Override 
    public void onDestroyView() { 
     super.onDestroyView(); 
     Fragment f = (Fragment) fragmentManager 
       .findFragmentById(R.id.container); 
     if (f != null) 
      fragmentManager.beginTransaction().remove(f).commit(); 
    } 

...在onDestroyView()功能。相反，您應該刪除活動類的onPause()方法中的片段。同樣，您應該在活動的onResume()方法中添加片段。