如何处理错误：java.lang.IllegalStateException：内容视图尚未创建 [英] How to handle Error: java.lang.IllegalStateException: Content view not yet created

问题描述

InboxFragment是MainActivity的片段。
在MainActivity（在动作条这三个点）的操作栏菜单中，我增加了一个选项刷新收件箱中，通过创建InboxFragment的对象调用一个函数retrieveMessages（）。
retrieveMessages是InboxFragment一个成员功能​​（它早些时候片段onCreateView功能是获取消息，然后我重构它来提取code重用它MainActivity）。

InboxFragment is a fragment of MainActivity. In action bar menu of the MainActivity (those three dots on the ActionBar), I added an option Refresh Inbox, which calls a function retrieveMessages() by creating an object of InboxFragment. retrieveMessages is a 'member' function in InboxFragment (which was earlier in onCreateView function of the fragment to retrieve messages, then I refactored it to extract code to reuse it in MainActivity).

我以这个意图使用重新创建MainActivity试过，MainActivity.class作为意向的参数，但是这是一种丑陋的刷新。如何处理上述错误？

I have tried using intent to re-create MainActivity by using this, MainActivity.class as parameters of the Intent but that is kind of an ugly refresh. How to handle the above error?

下面是需要code片：
在MainActivity：

Here are the required pieces of code: In MainActivity:

 @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            int itemId = item.getItemId();

switch(itemId) {

//pieces of code we're not concerned with

    case R.id.action_refresh_inbox:
    InboxFragment inboxFragment = new InboxFragment();
    inboxFragment.retrieveMessages();
    break;
    }
}

在InboxFragment.java -

In InboxFragment.java -

public class InboxFragment extends ListFragment {
@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_inbox, container, false);

            return rootView;
    }
 @Override
    public void onResume() {
        super.onResume();

        retrieveMessages();
    }

    public void retrieveMessages() {
//code that was earlier running in onResume(){};
}

下面是logcat的：

Here is the logcat:

01-11 01:35:44.515  21968-21968/com.ghostriley.sgt.ghostchat E/ViewRootImpl﹕ sendUserActionEvent() mView == null
01-11 01:35:44.535  21968-22032/com.ghostriley.sgt.ghostchat D/mali_winsys﹕ new_window_surface returns 0x3000,  [227x88]-format:1
01-11 01:35:44.945  21968-21968/com.ghostriley.sgt.ghostchat D/AndroidRuntime﹕ Shutting down VM
01-11 01:35:44.945  21968-21968/com.ghostriley.sgt.ghostchat E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.ghostriley.sgt.ghostchat, PID: 21968
    java.lang.IllegalStateException: Content view not yet created
            at android.support.v4.app.ListFragment.ensureList(ListFragment.java:328)
            at android.support.v4.app.ListFragment.getListView(ListFragment.java:222)
            at com.ghostriley.sgt.ghostchat.UI.InboxFragment$1.done(InboxFragment.java:67)
            at com.ghostriley.sgt.ghostchat.UI.InboxFragment$1.done(InboxFragment.java:55)
            at com.parse.ParseTaskUtils$2$1.run(ParseTaskUtils.java:115)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5930)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)

有什么办法CAL InboxFragment.onResume（）？

Is there any way to cal InboxFragment.onResume() ?

推荐答案

您还没有连接你的片段你的活动。你需要的线沿线的东西：

You haven't attached your Fragment to your Activity. You'll need something along the lines of:

getFragmentManager()
    .beginTransaction()
    .add(android.R.id.content, inboxFragment)
    .commit();

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