HDMISwitch

public static boolean isHdmiSwitchSet() {
        // The file '/sys/devices/virtual/switch/hdmi/state' holds an int -- if it's 1 then an HDMI device is connected.
        // An alternative file to check is '/sys/class/switch/hdmi/state' which exists instead on certain devices.
        File switchFile = new File("/sys/devices/virtual/switch/hdmi/state");
        if (!switchFile.exists()) {
            switchFile = new File("/sys/class/switch/hdmi/state");
        }
        try {
            Scanner switchFileScanner = new Scanner(switchFile);
            int switchValue = switchFileScanner.nextInt();
            switchFileScanner.close();
            return switchValue >= 0;
        } catch (Exception e) {
            return false;// always return false in STB Android 6.0.1
        }
    }