Resolves an issue where alertdialog (dialog box) cannot be added (android.view.windowmanager$badtokenexception) in Broadcastreceiver (broadcast recipient)

In Broadcastreceiver, when we create a alertdialog and show out, the following error occurs:

12-24 14:10:57.025:e/androidruntime (17600): java.lang.RuntimeException:Unable to start receiver com.ustc.broadcastreceiver.forceofflinereceiver:android.view.windowmanager$badtokenexception:unable to add window --Token null is a application

The following methods can be resolved:

The first step:

Before calling the Show method, set the following properties:

Dialog.getwindow (). SetType (WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);

Run again, the Discovery program hangs again:

12-24 14:15:22.793:e/androidruntime (17979): java.lang.RuntimeException:Unable to start receiver com.ustc.broadcastreceiver.forceofflinereceiver:android.view.windowmanager$badtokenexception:unable to add window [Email protected]--Permission denied for this window type

This is a look to know, permission denied, need to add permissions:

Step Two:

To add permissions in the manifest file:

<uses-permission android:name= "Android.permission.SYSTEM_ALERT_WINDOW"/>

This runs OK, and my code is as follows:

Package Com.ustc.broadcastreceiver;import Android.app.alertdialog;import Android.app.alertdialog.builder;import Android.content.broadcastreceiver;import Android.content.context;import Android.content.dialoginterface;import Android.content.dialoginterface.onclicklistener;import Android.content.intent;import Android.view.WindowManager; public class Forceofflinereceiver extends Broadcastreceiver {@Overridepublic void OnReceive (Final context context, Intent Intent) {alertdialog.builder builder = new Builder (context); Builder.settitle ("hint"); Builder.setmessage ("Forced downline") ; builder.setcancelable (false); Builder.setpositivebutton ("OK", new Onclicklistener () {@Overridepublic void OnClick ( Dialoginterface dialog, int which) {activitycollector.finishall (); Intent Intent = new Intent (context, Loginactivity.class); Intent.addflags (Intent.flag_activity_new_task); context.startactivity (intent);}}); Alertdialog dialog = Builder.create ();d Ialog.getwindow (). SetType (WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); DialoG.show ();}} 

Resolves an issue where alertdialog (dialog box) cannot be added (android.view.windowmanager$badtokenexception) in Broadcastreceiver (broadcast recipient)