If the tokens don’t match, the window manager rejects the request and throws a BadTokenException. The window manager protects against this by requiring applications to pass their application’s window token as part of each request to add or remove a window. Window tokens are important for security reasons because they make it impossible for malicious applications to draw on top of the windows of other applications.

06-19 22:18:06.485 27339-27339/ E/AndroidRuntime: FATAL EXCEPTION: main Process:, PID: 27339 : Unable to start service with Intent : $BadTokenException: Unable to add window - permission denied for window type 2006 at (ActivityThread.java:3556) at .-wrap20(Unknown Source:0) at $H.handleMessage(ActivityThread.java:1698) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164) at (ActivityThread.java:6541) at .invoke(Native Method) at .Zygote$n(Zygote.java:240) at .ZygoteInit.main(ZygoteInit.java:767) Caused by: $BadTokenException: Unable to add window - permission denied for window type 2006 at (ViewRootImpl.java:788) at (WindowManagerGlobal.java:356) at (WindowManagerImpl.java:92) at (HiddenCameraService.java:125) at (HiddenCameraService.java:82) at .(CameraService.java:100) at (ActivityThread.java:3539) at .-wrap20(Unknown Source:0) at $H.handleMessage(ActivityThread.java:1698) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164) at (ActivityThread.java:6541) at .invoke(Native Method) at .Zygote$n(Zygote.java:240) at .ZygoteInit.main(ZygoteInit.WindowManagerService (WMS) is a system service that manages the windows on Android.Īs the name suggest, a window token is a special type of Binder token used by window manager to uniquely identify a window in the system.

Android java windowmanager permission