ListFragment 中的 Android ListView 标头在按下后退按钮时崩溃

Question

我有一个 ListFragment 类：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    inflater.inflate(R.layout.fragment_information, container);
    listAdapter = new ArrayAdapter<String>(inflater.getContext(),
            android.R.layout.simple_list_item_1, new String[] {
                    "See the Demo!", "Read More!" });
    header = inflater.inflate(R.layout.information_headerview, null);
    return super.onCreateView(inflater, container, savedInstanceState);
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    TextView tv = (TextView) header.findViewById(R.id.information_header_textview);
    tv.setText(Model.Information);
    getListView().addHeaderView(header);
    setListAdapter(listAdapter);
}

当我第一次创建片段时，这很好用。然后，当我在按下后退按钮时导航回此片段时，在 Android main](Suspended(exception IllegalStateException)) 和 public void addHeaderView(View v, Object dad, boolean isSelectable) 上面的文档中的一个中断：

/**
 * Add a fixed view to appear at the top of the list. If this method is
 * called more than once, the views will appear in the order they were
 * added. Views added using this call can take focus if they want.
 * <p>
 * Note: When first introduced, this method could only be called before
 * setting the adapter with {@link #setAdapter(ListAdapter)}. Starting with
 * {@link android.os.Build.VERSION_CODES#KITKAT}, this method may be
 * called at any time. If the ListView's adapter does not extend
 * {@link HeaderViewListAdapter}, it will be wrapped with a supporting
 * instance of {@link WrapperListAdapter}.
 *
 * @param v The view to add.
 * @param data Data to associate with this view
 * @param isSelectable whether the item is selectable
 */

当然，我在 KitKat 中没有问题，但其他任何东西都会崩溃。

帮助？

编辑：logcat：

07-09 03:46:45.000: E/AndroidRuntime(716): FATAL EXCEPTION: main
07-09 03:46:45.000: E/AndroidRuntime(716): java.lang.IllegalStateException: Cannot add     header view to list -- setAdapter has already been called.
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.widget.ListView.addHeaderView(ListView.java:255)
07-09 03:46:45.000: E/AndroidRuntime(716):  at fragments.InformationFragment.onViewCreated(InformationFragment.java:53)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:842)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1032)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.app.BackStackRecord.popFromBackStack(BackStackRecord.java:697)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.app.FragmentManagerImpl.popBackStackState(FragmentManager.java:1431)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:453)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.app.Activity.onBackPressed(Activity.java:2121)
07-09 03:46:45.000: E/AndroidRuntime(716):  at com.allgoodpeopleus.evolutionp.MainActivity.onBackPressed(MainActivity.java:82)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.app.Activity.onKeyUp(Activity.java:2099)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.view.KeyEvent.dispatch(KeyEvent.java:2575)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.app.Activity.dispatchKeyEvent(Activity.java:2329)
07-09 03:46:45.000: E/AndroidRuntime(716):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1806)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3327)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.view.ViewRootImpl.handleFinishedEvent(ViewRootImpl.java:3300)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2460)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.os.Looper.loop(Looper.java:137)
07-09 03:46:45.000: E/AndroidRuntime(716):  at android.app.ActivityThread.main(ActivityThread.java:4424)
07-09 03:46:45.000: E/AndroidRuntime(716):  at java.lang.reflect.Method.invokeNative(Native Method)
07-09 03:46:45.000: E/AndroidRuntime(716):  at java.lang.reflect.Method.invoke(Method.java:511)
07-09 03:46:45.000: E/AndroidRuntime(716):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-09 03:46:45.000: E/AndroidRuntime(716):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-09 03:46:45.000: E/AndroidRuntime(716):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

所以我找到了问题的答案：http://code.neenbedankt.com/note-to-self-listfragment-and-header-views/

当我离开时，ListView 似乎永远不会被破坏。所以我不得不这样称呼：

@Override
public void onDestroyView() {
    super.onDestroyView();
    setListAdapter(null);
}

当我按下后退按钮时摆脱适配器并重新创建它。这符合文档中关于

Answer 2

您是在模拟器还是真实设备中尝试。 我在使用某种不同类型的代码时遇到了同样的问题，并且 logcat 没有显示相关信息，这对我有用：- Window > Preferences > Android > Logcat > (Monitor Logcat Messages from applications in workspace) 将其更改为 VERBOSE。