The code here let's me believe, that there should be a setOverscan method inside the IWindowManager$Stub but there isn't. Am I doing something wrong or is it just not possible to do what I want to do the way I try to do it?
Calling getMethod won't work in this case. See the following code to get and invoke the setOverscan method:
kotlin
object WindowManagerHackery {
@SuppressLint("PrivateApi")
@Throws(OverscanInvocationError::class)
fun setOverscan(displayId: Int = Display.DEFAULT_DISPLAY, left: Int = 0, top: Int = 0, right: Int = 0, bottom: Int = 0) {
try {
val ServiceManager = Class.forName("android.os.ServiceManager")
val service = ServiceManager.getMethod("getService", String::class.java)
val binder = service.invoke(null, "window") as IBinder
val windowManagerStub = Class.forName("android.view.IWindowManager").classes[0]
val serviceObj = windowManagerStub.getMethod("asInterface", IBinder::class.java).invoke(null, binder)
windowManagerStub.methods.first { it.name == "setOverscan" }
.invoke(serviceObj, displayId, left, top, right, bottom)
} catch (e: Exception) {
throw OverscanInvocationError(e)
}
}
class OverscanInvocationError(e: Exception) : Exception(e)
}Usage:
java
WindowManagerHackery.setOverscan(bottom = overscanOffset)You will need android.permission.WRITE_SECURE_SETTINGS. I would also check out https://github.com/tiann/FreeReflection for support on API 28 but I'm not sure if Google Play has a policy against including this library in an APK if you plan on publishing on the market.