libGDX InputAdapter.touchDragged（）未调用

Question

我正在开发Macbook专业版。 这是我的InputAdapter基本代码：

public class PlayScreenInputAdapter extends InputAdapter {
    public boolean touchDown(int screenX, int screenY, int pointer, int button) {
        Gdx.app.log("PlayScreenInputAdapter", "touch down");
        return true;
    }

    public boolean touchUp(int screenX, int screenY, int pointer, int button) {
        Gdx.app.log("PlayScreenInputAdapter", "touch up");
        return true;
    }

    public boolean touchDragged(int screenX, int screenY, int pointer, int button) {
        Gdx.app.log("PlayScreenInputAdapter", "touch dragged");
        return true;
    }

    public boolean mouseMoved(InputEvent event, float x, float y) {
        Gdx.app.log("PlayScreenInputAdapter", "mouse moved");
        return true;
    }

}

不会调用touchDragged和mouseMoved方法，但是会调用其他方法。 我真的只需要touchDragged方法，但是我只是注意到也没有调用mouseMoved方法。