Android 手势初步

GestureDetector用来监听手势，并且提供了两个监听器接口，OnGestureListener处理单击类消息，OnDoubleTapListener处理双击类消息

处理手势时，构造一个GestureDetector对象，并传入一个OnGestureListener对象作为构造参数。

OnGestureListener的几种回调方法：

onDown(MotionEvent e) 按下时触发
onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) 在手指滑动后并且离开屏幕时触发。
onLongPress(MotionEvent e) 长按，在onShowPress后执行
onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) 滑动时触发
onShowPress(MotionEvent e) 按下，还没移动或者松开，在onDown后执行
onSingleTapUp(MotionEvent e) 轻按屏幕并松开

可以写个小例子测试下

public class MainActivity extends Activity {GestureDetector gues;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);    gues = new GestureDetector(this, new GestureListener());}@Overridepublic boolean onTouchEvent(MotionEvent event) {return gues.onTouchEvent(event);}private class GestureListener implements OnGestureListener {@Overridepublic boolean onDown(MotionEvent e) {Log.v("test", "onDown");return false;}@Overridepublic void onShowPress(MotionEvent e) {Log.v("test", "onShowPress");}@Overridepublic boolean onSingleTapUp(MotionEvent e) {Log.v("test", "onSingleTapUp");return false;}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2,float distanceX, float distanceY) {Log.v("test", "onScroll");return false;}@Overridepublic void onLongPress(MotionEvent e) {Log.v("test", "onLongPress");}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {Log.v("test", "onFling");Log.v("test", "x speed:" + velocityX);Log.v("test", "y speed:" + velocityY);return false;}}}