android – 从Fragment添加项目到操作栏的选项菜单然后更改方向后崩溃

我正在使用 ActionBarSherlockViewPagerIndicator将片段显示为选项卡.其中一个片段将项添加到ActionBar:

private String[] mapNames;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
    // init an String array `mapNames` which is used when populating submenu
    // ...
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {

    inflater.inflate(R.menu.fragment_maps, menu);

    SubMenu mapNamesMenu = menu.findItem(R.id.map_names).getSubMenu();
    mapNamesMenu.clear();
    for (int i=0; i<mapNames.length; i++) {
        mapNamesMenu.add(1, i, Menu.NONE, mapNames[i]);
    }

    super.onCreateOptionsMenu(menu, inflater);
}

在res / menu / fragment_maps.xml中我有

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/map_names"
        android:title="Maps"
        android:icon="@drawable/maps_32"
        android:showAsAction="always|withText">
        <menu>
            <item android:id="@+id/placeholder_maps" />
        </menu>
    </item>
</menu>

在旋转手机之前一切正常.方向更改后,此菜单变得不可访问(单击图标时没有任何反应).然后,如果我再次旋转手机,我会收到此错误:

FATAL EXCEPTION: main
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
at android.view.ViewRoot.setView(ViewRoot.java:532)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
at android.view.Window$LocalWindowManager.addView(Window.java:424)
at android.widget.PopupWindow.invokePopup(PopupWindow.java:912)
at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:824)
at com.actionbarsherlock.internal.widget.IcsListPopupWindow.show(IcsListPopupWindow.java:226)
at com.actionbarsherlock.internal.view.menu.MenuPopupHelper.tryShow(MenuPopupHelper.java:129)
at com.actionbarsherlock.internal.view.menu.MenuPopupHelper.show(MenuPopupHelper.java:102)
at com.actionbarsherlock.internal.view.menu.ActionMenuPresenter.onSubMenuSelected(ActionMenuPresenter.java:273)
at com.actionbarsherlock.internal.view.menu.MenuBuilder.dispatchSubMenuSelected(MenuBuilder.java:263)
at com.actionbarsherlock.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:892)
at com.actionbarsherlock.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:510)
at com.actionbarsherlock.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:145)
at android.view.View.performClick(View.java:2494)
at android.view.View$PerformClick.run(View.java:9122)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3806)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)

任何想法如何解决?我使用的是Android 2.3.6

编辑:见test repository

我想,这是一个上下文问题.这就是BadTokenException正在发生的原因.

这个例外背后有很多可能性:

1)您可能正在某个地方使用“this”作为上下文引用,它实际上需要YourActivity.this或父活动的上下文.

要么

2)从我猜测的log-cat中,你试图显示一个弹出窗口.

问题可能是,您过早地显示弹出窗口(即在活动生命周期完成之前).
所以等到活动生命周期结束.

要推迟显示弹出窗口,可以参考此link.

总之,这个问题是由于以下用例:

An activity’s reference is passed to the some component (i.e. like
Toast, alert dialog, pop-up etc), and activity destroyed but
that component is still alive or trying to use destroyed activity’s
context.

所以要确保没有这样的情况.

希望你能给你一些解决问题的暗示.

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