初始化PopupWindow Caused by: android.view.WindowManager$BadTokenException:

在Android开发中遇到PopupWindow在onCreate()方法初始化时抛出`android.view.WindowManager$BadTokenException`异常。错误原因在于Activity未完全启动时尝试显示PopupWindow。解决方案是通过Handler延迟调用来确保在正确的时间显示PopupWindow,从而避免该异常。

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如题,完整的错误提示信息是
Caused by: android.view.WindowManager$BadTokenException: Unable to add window – token null is not valid; is your activity running?
这个有很多中个情况会导致android.view.WindowManager$BadTokenException
我是在Activity的onCreate()方法中去创建并初始化PopupWindow的时候遇到这个问题,刚开始一脸懵逼,不知道什么原因,如下图提示的错误:这里写图片描述
错误的提示指向了280行:
popupWindow.showAsDropDown(view);
仔细分析错误提示,当你的Activity在运行的时候,不能添加到窗口,token是空的无效的。想到我们以往的popupWindow创建都是在onClick()事件方法中被初始化然后弹出来的,现在的话,因项目的需要,直接放到了onCreate()中进行了初始化,没有经过事件也没用经过线程去调用初始化popupWindow。
那么,PopupWindow必须在某个事件中显示或者是开启一个新线程去调用,不能直在onCreate()方法中显示一个PopupWindow
于是乎,我们既然需要直接的调用popupWindow显示,那么我就通过开启一个handler来进行调用,具体的方法是在最外面顶一个showPopWindowHandler的Handler线程:
private Handler showPopWindowHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 0:
showPopupWindow();//你自己定义的显示PopupWindow的方法
break;
}
}
};

然后我们在onCreate()方法中去使用showPopWindowHandler,调用他的延迟加载方法:
·showPopWindowHandler .sendEmptyMessageDelayed(0, 10); ·//第二个参数任意
这样当进入到当前的这个activity当中的时候,延迟去调用并初始化PopupWindow,避免BadTokenException。
希望帮到你,欢迎交流!

07-20 19:57:40.672 5131 5131 D AndroidRuntime: Shutting down VM --------- beginning of crash 07-20 19:57:40.673 5131 5131 E AndroidRuntime: FATAL EXCEPTION: main 07-20 19:57:40.673 5131 5131 E AndroidRuntime: Process: com.adayo.aaop_deviceservice, PID: 5131 07-20 19:57:40.673 5131 5131 E AndroidRuntime: java.lang.RuntimeException: Unable to create service com.adayo.aaop_deviceservice.service.BurialPointService: android.view.WindowManager$InvalidDisplayException: Unable to add window android.view.ViewRootImpl$W@e6477e5 -- the specified display can not be found 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.app.ActivityThread.handleCreateService(ActivityThread.java:4221) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.app.ActivityThread.access$1600(ActivityThread.java:238) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1955) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:106) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.os.Looper.loop(Looper.java:223) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7731) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: Caused by: android.view.WindowManager$InvalidDisplayException: Unable to add window android.view.ViewRootImpl$W@e6477e5 -- the specified display can not be found 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.view.ViewRootImpl.setView(ViewRootImpl.java:1099) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:409) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:109) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.app.Dialog.show(Dialog.java:342) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.app.Presentation.show(Presentation.java:257) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at com.adayo.aaop_deviceservice.service.BurialPointService.x(Unknown Source:77) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at com.adayo.aaop_deviceservice.service.BurialPointService.A(Unknown Source:50) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at com.adayo.aaop_deviceservice.service.BurialPointService.onCreate(Unknown Source:10) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: at android.app.ActivityThread.handleCreateService(ActivityThread.java:4209) 07-20 19:57:40.673 5131 5131 E AndroidRuntime: ... 8 more 07-20 19:57:40.676 5131 5131 I Process : Sending signal. PID: 5131 SIG: 9 private void createBackgroundToQnx() { DisplayManager displayManager = (DisplayManager)this.getSystemService(Context.DISPLAY_SERVICE); Display[] displays = displayManager.getDisplays(); Log.i(TAG, "createBackgroundToQnx displays = " + Arrays.toString(displays)); for (Display display : displayManager.getDisplays()) { if (display.getDisplayId() == 1) { Presentation presentation = new Presentation(this, displayManager.getDisplay(1)); View view = new View(this); view.setBackgroundColor(Color.BLACK); presentation.setContentView(view); presentation.show(); } } }
最新发布
08-07
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