一、onTouch
onTouch是View中OnTouchListener接口中的方法，处理View及其子类被touch是的事件处理。当然，前提是touch时间能够传递到指定的view。Q1：为什么会传递不到呢？
1: /**
2: * Interface definition for a callback to be invoked when a touch event is
3: * dispatched to this view. The callback will be invoked before the touch
4: * event is given to the view.
5: */
6: public interface OnTouchListener {
7: /**
8: * Called when a touch event is dispatched to a view. This allows listeners to
9: * get a chance to respond before the target view.
10: *
11: * @param v The view the touch event has been dispatched to.
12: * @param event The MotionEvent object containing full information about
13: * the event.
14: * @return True if the listener has consumed the event, false otherwise.
15: */
16: boolean onTouch(View v, MotionEvent event);
17: }
二、onTouchEvent
onTouchEvent同样也是在view中定义的一个方法。处理传递到view 的手势事件。手势事件类型包括ACTION_DOWN,ACTION_MOVE,ACTION_UP,ACTION_CANCEL四种事件。
1: /**
2: * Implement this method to handle touch screen motion events.
3: *
4: * @param event The motion event.
5: * @return True if the event was handled, false otherwise.
6: */
7: public boolean onTouchEvent(MotionEvent event) {
8: ……
9: ……
10: }
一旦onTouchEvent方法被调用，并返回true则这个手势事件就结束了，并不会向下传递到子控件。Q2：onTouchEvent什么时候被调用呢？
三、onInterceptTouchEvent
onInterceptTouchEvent是在ViewGroup里面定义的。Android中的layout布局类一般都是继承此类的。onInterceptTouchEvent是用于拦截手势事件的，每个手势事件都会先调用onInterceptTouchEvent。
1: public boolean onInterceptTouchEvent(MotionEvent ev) {
2: return false;
3: }
此方法返回false，则手势事件会向子控件传递；返回true，则调用onTouchEvent方法。
以上纯属个人见解，如有不同看法欢迎交流。
-----------------EOF----------------