Fullscreen Activity in Android?

Question

How do I make an activity full screen? I mean without the notification bar. Any ideas?

Answer 1

On Android 10, none worked for me.

But I that worked perfectly fine (1st line in oncreate):

    View decorView = getWindow().getDecorView();
    int uiOptions = View.SYSTEM_UI_FLAG_IMMERSIVE;
    decorView.setSystemUiVisibility(uiOptions);

    setContentView(....);

    if (getSupportActionBar() != null) {
        getSupportActionBar().hide();
    }

enjoy :)