检测类中的事件

Question

  

可能重复：
  What is the right way to communicate from a custom View to the Activity in which it resides?

我还是Java新手。

我想制作一个滑块类。我希望这个类可以处理所有滑动机制，并且可以抽象出滑块内完成的操作。

主要代码：

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentLayout(R.layout.slider_page);
    slide = (Slider) findViewById(R.id.slider);
    slide.addSlide(R.drawable.slide_blue);
    slide.addSlide(R.drawable.slide_green);

    /* I want to implement the following three functions */
        slide.touched () {
            text.setText("Slider touched")
            // Do stuff
        }

        slide.onSwipeRight() {
            text.setText("Swipe right detected");
            // do more stuff
        }

        slide.touchReleased() {
            text.setText("Slider released");
            // more stuff
        }

}

Slider.java：

public class Slider extends ViewFlipper implements OnTouchListener {
private int SWIPE_MIN_DISTANCE = 100;
private int DOWNTIME_MAX = 300;
private int SWIPETIME_MAX = 870;
private Context mContext;
private float xDownPos;

public Slider(Context context, AttributeSet attrs) {
    super(context, attrs);
    mContext = context;
    this.setOnTouchListener((OnTouchListener) mContext);
}

public void addSlide (int resId) {
    ImageView iv = new ImageView(mContext);
    iv.setImageResource(resId);
    this.addView(iv);
}

public boolean onTouch(View v, MotionEvent event) {
    switch (event.getAction())
    {
        case MotionEvent.ACTION_DOWN:
        {
            // store the X value when the user's finger was pressed down
            xDownPos = event.getX();
            /* How do I get this to return to touched () in the main code? */
            break;
        }

        case MotionEvent.ACTION_UP:
        {
            // Get the X value when the user released his/her finger
            float currentX = event.getX();
            float horizontalMovement = currentX - xDownPos;
            long timePressed = event.getEventTime() - event.getDownTime();

            // Left to Right
            if (horizontalMovement > SWIPE_MIN_DISTANCE && timePressed < SWIPETIME_MAX)
            {
                /* How do I return this to onSwipeRight() in main code? */
            }

            /* How do I return this to touchReleased() in main code? */

            break;
        }
    }
}

所以，基本上，我想在main中实现touch（），onSwipeRight（）和touchReleased（）段的代码，并尝试让Slider.java向main发送某种信号。这样做。