我正在使用
ActionBarSherlock和
ViewPagerIndicator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
解决方法
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.
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-upetc),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.
