PopupWindow $BadTokenException：无法添加窗口 - 令牌 null 无效

显示 PopupWindow 时出现以下错误。 错误由以下行触发：

checkInPopup.showAtLocation((ViewGroup) mapView.getParent(), Gravity.CENTER_HORIZONTAL, 0, 0);

mapView 是一个 MapView，没有任何内容为 null。 堆栈跟踪：

01-08 18:00:09.402: E/AndroidRuntime(27768): Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.view.ViewRootImpl.setView(ViewRootImpl.java:513)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:301)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.view.Window$LocalWindowManager.addView(Window.java:537)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.widget.PopupWindow.invokePopup(PopupWindow.java:988)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.widget.PopupWindow.showAtLocation(PopupWindow.java:845)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.widget.PopupWindow.showAtLocation(PopupWindow.java:809)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at com.geoloc.ActivityCheckIn.onCreate(ActivityCheckIn.java:50)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.app.Activity.performCreate(Activity.java:4465)
01-08 18:00:09.402: E/AndroidRuntime(27768):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)

这是我的活动中的代码（扩展了 MapActivity）

    protected void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.checkin);
    mapView = (MapView) findViewById(R.id.mapview);

    LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    checkInPopup = new PopupWindow(inflater.inflate(CHECK_IN_POPUP_LAYOUT, null, false));
    checkInPopup.setOutsideTouchable(true);
    checkInPopup.setHeight(100);
    checkInPopup.setWidth(200);
    checkInPopup.showAtLocation((ViewGroup) mapView.getParent(), Gravity.CENTER_HORIZONTAL, 0, 0);
}

感谢您分享您的想法

当我尝试在活动中显示弹出菜单时，我也遇到了同样的问题。

我也遇到了同样的异常，但我遇到了问题并通过提供正确的上下文解决了它。

// at this line
Dialog dialog = new Dialog(getApplicationContext());

Use

YourActivityName.this代替getApplicationContext()

是的，它对我有用，也许它会对其他人有所帮助。