libgdx获得触摸事件的压力

Question

I am developing a pressure sensitive game on android. (Or with other words the game is finished) But know i want to start using a game engine and i decided to use Libgdx. However the GestureDetector.GestureListener and the InputProcessor Interface do not provide the pressure parameter from the android internal MotionEvent. I tried to manually set the Game as a View.OnTouchListener but that is interfering with the threading model ...

any suggestions for a work around?

Answer 1

There is only one option so far i know ie getPressure() from MotionEvent class. the function will give you the value between 0 to 1 in float. docs

Note : Device without pressure sensor simulate pressure by the size of touch point.

More pressure means more area of screen covered by finger .

setOnTouchListener can give you MotionEvent object from which you can get the pressure value like.

someView.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        float pressure = event.getPressure();
    }
});

Answer 2

Here is part of my code for adding the pressure to a game object

final MyGdxGame game = new MyGdxGame();

    View view = initializeForView(game, config);
    view.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            getInput().onTouch(v, event);
            game.setPressure(event.getPressure());
            Log.v("log", "hooked " + event.getPressure());
            return true;
        }
    });

The trick is that I have to call initializeForView in order to overwrite the onTouchListener and forward the MotionEvent to the Input Handler of Libgdx .