removeAllViews（）错误保留片段实例时 [英] removeAllViews() error when retaining fragment instance
本文介绍了removeAllViews（）错误保留片段实例时的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想保留在方向改变我的片段实例。我用的是低于code在我的片段。
I am trying to retain my fragment instance on orientation change. I use the below code in my fragment.
private View fragmentLayoutView;
private ListView myListView;
@Override
public void onCreate(Bundle savedInstanceState) {
...
setRetainInstance(true);
...
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
if(fragmentLayoutView == null){
fragmentLayoutView = inflater.inflate(R.layout.myfragmentLayout,container,false);
}
else{
((ViewGroup) myListView.getParent()).removeAllViews();
}
return fragmentLayoutView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
myListView = (ListView) getActivity().findViewById(R.id.listview1);
myCustomCursorAdaptor = new MyCustomCursorAdaptor(getActivity());
myListView.setAdapter(myCustomCursorAdaptor);
...
}
但我得到后 onCreateView错误（）返回。在 removeAllViews（）行似乎被创造的问题。
But i get an error after onCreateView() has returned. The removeAllViews() line seems to be creating the problem.
logcat的：
06-17 23:57:08.631: E/AndroidRuntime(1149): FATAL EXCEPTION: main
06-17 23:57:08.631: E/AndroidRuntime(1149): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp.www/com.mypackage.myActionBarActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2308)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2362)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3895)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.ActivityThread.access$800(ActivityThread.java:168)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1335)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.os.Handler.dispatchMessage(Handler.java:99)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.os.Looper.loop(Looper.java:137)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.ActivityThread.main(ActivityThread.java:5493)
06-17 23:57:08.631: E/AndroidRuntime(1149): at java.lang.reflect.Method.invokeNative(Native Method)
06-17 23:57:08.631: E/AndroidRuntime(1149): at java.lang.reflect.Method.invoke(Method.java:525)
06-17 23:57:08.631: E/AndroidRuntime(1149): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1209)
06-17 23:57:08.631: E/AndroidRuntime(1149): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1025)
06-17 23:57:08.631: E/AndroidRuntime(1149): at dalvik.system.NativeStart.main(Native Method)
06-17 23:57:08.631: E/AndroidRuntime(1149): Caused by: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:719)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
06-17 23:57:08.631: E/AndroidRuntime(1149): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:361)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.Activity.setContentView(Activity.java:1956)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.support.v7.app.ActionBarActivity.superSetContentView(ActionBarActivity.java:216)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.support.v7.app.ActionBarActivityDelegateICS.setContentView(ActionBarActivityDelegateICS.java:110)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:76)
06-17 23:57:08.631: E/AndroidRuntime(1149): at com.mypackage.myActionBarActivity.onCreate(myActionBarActivity.java:20)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.Activity.performCreate(Activity.java:5372)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
06-17 23:57:08.631: E/AndroidRuntime(1149): ... 12 more
06-17 23:57:08.631: E/AndroidRuntime(1149): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.ViewGroup.addViewInner(ViewGroup.java:3739)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.ViewGroup.addView(ViewGroup.java:3610)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.ViewGroup.addView(ViewGroup.java:3555)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.ViewGroup.addView(ViewGroup.java:3531)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:915)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1093)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:310)
06-17 23:57:08.631: E/AndroidRuntime(1149): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:691)
06-17 23:57:08.631: E/AndroidRuntime(1149): ... 25 more
有没有错误，但在ListView从布局上消失，如果我尝试下面的选项：
There is no error, but the listView disappears from the layout if i try the below options :
- 删除的if-else，只是每次充气时间
- 做的getParent的片段布局，而不是在列表视图 -
（（ViewGroup中）fragmentLayoutView.getParent（））removeAllViews（）;，
- remove the if-else and simply inflate every time
- do a getParent on the fragment layout instead of on the listView -
((ViewGroup) fragmentLayoutView.getParent()).removeAllViews();,
我究竟做错了什么？
推荐答案
我不得不删除片段布局的父的所有观点：
I had to remove all the views of the fragment layout's parent :
((ViewGroup) fragmentLayoutView.getParent()).removeAllViews();
然后检查适配器是初始化适配器和ListView前空：
Then check if the adaptor is null before initializing the adaptor and listview :
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if(myCustomCursorAdaptor == null){
myListView = (ListView) getActivity().findViewById(R.id.listview1);
myCustomCursorAdaptor = new MyCustomCursorAdaptor(getActivity());
myListView.setAdapter(myCustomCursorAdaptor);
}
...
}
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