prevent audio recording while screen recording in Android apps

Question

I'm developing an secure application where i'm restricting another application to record the moment of my application (like videos).

The think is i had restricted the screen capture (both screenshot and video recording) of my application as stated here , but i cant able to restrict the audio of my application's video.

   @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
    setContentView(R.layout.activity_main);
    playVideo();
    //callAPI();
}

After screen capturing i can't able to see the video (shows black screen) but i can hear the audio.

Please help me to get out of this.

Thanks in advance

Answer 1

Use SECURE FLAG in the Activity. Secure Flag Prevents Screen Recording Capture etc.

super.onCreate(savedInstanceState); 
getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE,WindowManager.LayoutParams.FLAG_SECURE);

Answer 2

you must detect first that a recording is started

you can achieve this by register display listener

 val displayManager = getSystemService(Context.DISPLAY_SERVICE) as? DisplayManager
        displayManager?.registerDisplayListener(listener, null)
       

    val listener = object : DisplayManager.DisplayListener {
        override fun onDisplayChanged(displayId: Int) {
            
        }

        override fun onDisplayAdded(displayId: Int) {
            
            // here stop video player 
        }

        override fun onDisplayRemoved(displayId: Int) {
          
        }
    }

FLAG_SECURE will make screen recording record a blank screen

Hint : this way only work if recording starts while activity is in foreground

UPDATE 1

The next workaround will work with most of third party recording apps before android 10:

by using AudioManager to mute mic, as these apps use mic