In the handleUserInput method, we pass the code of the key pushed by D-Pad or gamepad - https://github.com/bitmovin/bitmovin-player-android-samples/

AndroidTV-ActivityControlsSnippet_2.java

//https://github.com/bitmovin/bitmovin-player-android-samples/blob/5f0719f954e4ce8faee1bb290bed715a7ae1b935/BasicPlaybackTV/src/main/java/com/bitmovin/samples/tv/playback/basic/MainActivity.java#L134-L167
    private boolean handleUserInput(int keycode)
    {
        Log.d(TAG, "Keycode " + keycode);
        switch (keycode)
        {
            case KeyEvent.KEYCODE_DPAD_CENTER:
            case KeyEvent.KEYCODE_ENTER:
            case KeyEvent.KEYCODE_NUMPAD_ENTER:
            case KeyEvent.KEYCODE_SPACE:
            case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
                this.togglePlay();
                return true;
            case KeyEvent.KEYCODE_MEDIA_PLAY:
                this.bitmovinPlayer.play();
                return true;
            case KeyEvent.KEYCODE_MEDIA_PAUSE:
                this.bitmovinPlayer.pause();
                return true;
            case KeyEvent.KEYCODE_MEDIA_STOP:
                this.stopPlayback();
                return true;
            case KeyEvent.KEYCODE_DPAD_RIGHT:
            case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
                this.seekForward();
                break;
            case KeyEvent.KEYCODE_DPAD_LEFT:
            case KeyEvent.KEYCODE_MEDIA_REWIND:
                this.seekBackward();
                break;
            default:
        }

        return false;
    }