I have this error in just android 5.1
Unable to add window android.view.ViewRootImpl$W@1df76e3 -- the specified window type is not valid
this is the code :
wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
params = new WindowManager.LayoutParams(
RelativeLayout.LayoutParams.MATCH_PARENT,
RelativeLayout.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.TRANSPARENT);
...
wm.addView(relativeLayout, params);