Android chathead is killed when I open game - android

I'm using https://github.com/recruit-lifestyle/FloatingView
to create chathead like messenger on android.
But when I open a game, the chathead get killed.
Is there any way to display the chathead above the game?
Please help, thanks
Config of WindowManager in the lib:
mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
mParams = new WindowManager.LayoutParams();
mMetrics = new DisplayMetrics();
mWindowManager.getDefaultDisplay().getMetrics(mMetrics);
mParams.width = ViewGroup.LayoutParams.WRAP_CONTENT;
mParams.height = ViewGroup.LayoutParams.WRAP_CONTENT;
mParams.type = WindowManager.LayoutParams.TYPE_PRIORITY_PHONE;
mParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS |
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
mParams.format = PixelFormat.TRANSLUCENT;
mParams.gravity = Gravity.LEFT | Gravity.BOTTOM;

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This works for me in android 4.4.4 and 5.0.
WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
int statusBarHeight = (int) Math.ceil(25 * getResources().getDisplayMetrics().density);
TextView textView = new TextView(this);
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How to build a window on the top of all others window on Android

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I found this code:
bt = new Button(getApplicationContext());
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<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
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Change
wmgr = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
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