You can't get a window in a Service. But you can use WindowManager to add a view(root) as you did already.
And You can also update view through updateViewLayout, you can change your window's status(window type, flag, x, y, w, h, gravity, etc...) like below codes.
private WindowManager mWindowManager;
private WindowManager.LayoutParams mLayoutParams;
..........
//let's assume that an event occurred
if(mConfiguration.orientation==Configuration.ORIENTATION_LANDSCAPE){
mLayoutParams.screenOrientation=Configuration.ORIENTATION_PORTRAIT;
}
mLayoutParams.softInputMode=WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN;
mLayoutParams.gravity = Gravity.TOP|Gravity.CENTER;
int flag=0
|WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN
|WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
|WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM
;
mLayoutParams.flags=flag;
mWindowManager.updateViewLayout(mRootView, mLayoutParams);
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