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1. #Windowmanager$badtokenexception unable to add window how to
2. #Windowmanager$badtokenexception unable to add window android
3. #Windowmanager$badtokenexception unable to add window code

So now, after all, my research and analysis on BadTokenException, what I noticed about all the crashes there on Crashltyics:

#Windowmanager$badtokenexception unable to add window android

If returned the WindowManagerGlobal.ADD_BAD_APP_TOKEN, the exception occurs when the WMS.addWindow () function is called to check whether the window to be added is not in violation of the policy according to the android window policy. Return WindowManagerGlobal.ADD_BAD_APP_TOKEN

#Windowmanager$badtokenexception unable to add window code

This ensures secure interaction between the application and the window manager (by making it impossible to add windows on top of other applications), and also makes it easy for the activity manager to make direct requests to the window manager.Īnd the code that throws “BadTokenException” : The activity manager gives this token to both the (*application) and the window manager, and it sends the token to the window manager each time it wants to add a new window to the screen. When an application starts up for the first time, the ActivityManagerService creates a special kind of window token called an application window token, which uniquely identifies the application’s top-level container window. Without window tokens, this necessary identification step wouldn’t be possible and the window manager wouldn’t be able to protect itself from malicious applications. 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. Window Tokens: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. RootView.findViewById(R.id.content_button).WindowManagerService (WMS) is a system service that manages the windows on Android. Here it goes: private val windowParams = WindowManager.LayoutParams(

In the short source code sample above, we called addView with the second parameter being windowParams of type WindowManager.LayoutParams. WindowManager.addView(rootView, windowParams) Val windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager Fortunately, it allows us to add and remove views directly, and if we add them with correct parameters, we have our floating windows! // Obtain WindowManager

WindowManager is an interface that the app can use for communication with the window manager.Īnd the window manager on Android handles everything you can see on the screen.

#Windowmanager$badtokenexception unable to add window how to

In this article, I will teach you how to show the actual floating window over other apps. I received feedback from tens of thousands of users and see various issues on different phones with different Android versions.īefore reading this article, it’s recommended to go through Floating Windows on Android 3: Permissions. It’s sometimes tricky, and I spent months reading documentation and Android source code and experimenting.

After 6 years of the development of the app, I know a bit about it. I’m the author of Floating Apps the first app of its kind on Google Play and the most popular one with over 8 million downloads. Have you ever wondered how to make those floating windows used by Facebook Heads and other apps? Have you ever wanted to use the same technology in your app? It’s easy, and I will guide you through the whole process.