To check screen is on

 

public static boolean On(Context context) {
    DisplayManager dm = (DisplayManager) context.getSystemService(Context.DISPLAY_SERVICE);
    boolean screenOn = false;
    for (Display display : dm.getDisplays()) {
        if (display.getState() != Display.STATE_OFF) {
            screenOn = true;
        }
    }
    return screenOn;
}