Incorrect resolution in Qt Quick application

[Ali.Golbin]

I run a simple app using Mediaplayer and VideoOutput to showing a HD video on Android TV.
I use Screen.width and Screen.height for my Window object. But detected screen is 1280x720.

My main.qml is:

import QtQuick
import QtQuick.Window
import QtMultimedia

Window {
    id: mainWindow
    width: Screen.width
    height: Screen.height
    visible: true

    Rectangle {
        id: mw
        anchors.fill: parent
        color: "red"
        focus: true

        VideoOutput {
            id: videoOutput
            anchors.fill: parent
        }

        MediaPlayer {
            id: item_id
            audioOutput: AudioOutput {}
            videoOutput: videoOutput
        }

        Keys.onReturnPressed: {
            if (item_id.playbackState == MediaPlayer.PlayingState) {
                item_id.pause()
                console.log("Qt Player: "+videoOutput.width);
                console.log("Qt Player: "+videoOutput.height);
            } else if (item_id.playbackState == MediaPlayer.PausedState) {
                item_id.play()
            } else {
                item_id.source = "file:///storage/emulated/0/download/371.mp4"
                item_id.play();
                console.log("Starting ...")
                console.log("Qt Scene: "+mainWindow.width);
                console.log("Qt Scene: "+mainWindow.height);
            }
        }
        Keys.onLeftPressed: item_id.setPosition(item_id.position-3000)
        Keys.onRightPressed: item_id.setPosition(item_id.position+3000)

    }


    Component.onCompleted: {
//        showFullScreen()
        show()
    }

}

I tested my Android TV with a simple app with the same structure written in Android Studio and detected resolution is 1920x1080.

My Mainactivity.java is:

public class MainActivity extends Activity {

    public static VideoView videoView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Native Player
        MainActivity.videoView = (VideoView) findViewById(R.id.videoView);
        String videoURL = "file:///storage/emulated/0/download/371.mp4";
        Uri uri = Uri.parse(videoURL);
        MainActivity.videoView.setVideoURI(uri);
        MainActivity.videoView.start();

        MainActivity.videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                Log.e("> ", "Media is prepared. Playing ...");
                Log.e("> ", "W: "+MainActivity.videoView.getWidth());
                Log.e("> ", "H: "+MainActivity.videoView.getHeight());
            }
        });

    }
}

What is the problem?