SupportMapFragment 第二次展示答案

【问题标题】：SupportMapFragment show for second timeSupportMapFragment 第二次展示
【发布时间】：2014-08-09 02:16:32
【问题描述】：

我在自己的 Fragment 中有 SupportMapFragment。当我第二次显示此片段时，它崩溃了。

起初我尝试在 XML 中添加 SupportMapFragment，但遇到了与 here 描述的相同的问题。

所以我尝试以编程方式添加它：

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.map_fragment, container, false);
        isGooglePlay=isGooglePlay();
        if(isGooglePlay){
            mMapFragment = SupportMapFragment.newInstance();
            FragmentTransaction fragmentTransaction =
                         getChildFragmentManager().beginTransaction();
            fragmentTransaction.add(R.id.map_fragment_mapRoot, mMapFragment);
            fragmentTransaction.commit(); 
            map = mMapFragment.getMap();
            if (map != null){
                map.animateCamera(CameraUpdateFactory.zoomTo(100F));
            }
        }
        return view;
    }

它在提交事务的行崩溃。

  FATAL EXCEPTION: main
  Process: com.sabatsoft.sgs14remote, PID: 23914
  java.lang.IllegalStateException: Activity has been destroyed
    at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1365)
    at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
    at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)
    at com.sabatsoft.sgs14remote.fragment.FlightMapFragment.onCreateView(FlightMapFragment.java:45)
    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5001)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)

【问题讨论】：

标签： android supportmapfragment

【解决方案1】：

有一个类似的已知问题，看here

这是嵌套片段中的错误。基本上，子 FragmentManager 在与活动分离时最终会出现内部状态损坏。

短期解决方法是在您的片段中添加以下代码。

@Override
public void onDetach() {
super.onDetach();

try {
     Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager");
     childFragmentManager.setAccessible(true);
     childFragmentManager.set(this, null);
     } catch (NoSuchFieldException e) {
        throw new RuntimeException(e);
     } catch (IllegalAccessException e) {
        throw new RuntimeException(e);
    }
}

【讨论】：