使用onbackpressed（）時使用片段包含地圖片段

Question

我正在一個項目中有很多片段連接到一個片段管理器。我想在我的片段活動中實現onbackpressed方法，以便我可以回到以前的片段。

的onbackpressedcode如下所示：

public void onBackPressed() { 

       int count = getSupportFragmentManager().getBackStackEntryCount(); 

       if (count == 0) { 
        super.onBackPressed(); 
        //additional code 
       } else { 


        getSupportFragmentManager().popBackStackImmediate(); 
       } 

      } 

的問題是，有在fragment.There之一supportmapfragment在該片段列表視圖。當我需要我的列表視圖中單擊某個項到包含details.When另一個片段我按回到我得到一個IllegalStateException如下圖所示：

10-27 13:31:26.039: E/AndroidRuntime(15458): FATAL EXCEPTION: main 
10-27 13:31:26.039: E/AndroidRuntime(15458): android.view.InflateException: Binary XML file line #8: Error inflating class fragment 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:587) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.view.LayoutInflater.rInflate(LayoutInflater.java:623) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.view.LayoutInflater.inflate(LayoutInflater.java:408) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.view.LayoutInflater.inflate(LayoutInflater.java:320) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at com.igloo.fragments.ViewjobsFragment.onCreateView(ViewjobsFragment.java:123) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.support.v4.app.BackStackRecord.popFromBackStack(BackStackRecord.java:764) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.support.v4.app.FragmentManagerImpl.popBackStackState(FragmentManager.java:1527) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.support.v4.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:494) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at com.igloo.marinaretail.UserMain.onBackPressed(UserMain.java:476) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.app.Activity.onKeyUp(Activity.java:1898) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.view.KeyEvent.dispatch(KeyEvent.java:1280) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.app.Activity.dispatchKeyEvent(Activity.java:2078) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1705) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2626) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2601) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.view.ViewRoot.handleMessage(ViewRoot.java:1873) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.os.Handler.dispatchMessage(Handler.java:99) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.os.Looper.loop(Looper.java:130) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.app.ActivityThread.main(ActivityThread.java:3689) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at java.lang.reflect.Method.invokeNative(Native Method) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at java.lang.reflect.Method.invoke(Method.java:507) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at dalvik.system.NativeStart.main(Native Method) 
10-27 13:31:26.039: E/AndroidRuntime(15458): Caused by: java.lang.IllegalArgumentException: Binary XML file line #8: Duplicate id 0x7f06005e, tag null, or parent id 0x0 with another fragment for com.google.android.gms.maps.SupportMapFragment 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:296) 
10-27 13:31:26.039: E/AndroidRuntime(15458): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563) 
10-27 13:31:26.039: E/AndroidRuntime(15458): ... 26 more 

如何防止上述問題的緊迫回來。

此外，在包含地圖，我有下面的代碼片段的方法的OnDestroy：

@Override 
    public void onDestroy() { 

     SupportMapFragment f = (SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.map); 
     if (f.isResumed()){ 
      getActivity().getSupportFragmentManager().beginTransaction().remove(f).commit(); 
     } 

     super.onDestroy(); 
    } 

如何解決回壓問題？

有沒有辦法檢查堆棧中的前一個片段是否是包含supportmap的片段？

Answer 1

嘗試按照包含片段類代碼地圖：

public void onDestroyView() 
{ 
    super.onDestroyView(); 
    Fragment fragment = (getSupportFragmentManager().findFragmentById(R.id.map)); 
    FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction(); 
    ft.remove(fragment); 
    ft.commit(); 
} 

，我看到你的評論，我認爲你只是初始化GoogleMap的只是時間，它是空，您有類似下面的代碼，

if (googleMap == null) 
{ 

    // initialize Map 
} 

刪除如果部分並初始化您的地圖。