android 手势左右滑动

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继承SimpleOnGestureListener 类，判断左右滑动并处理事件：

class MyGestureDetector extends SimpleOnGestureListener {
  private static final int SWIPE_MIN_DISTANCE = 120;
  private static final int SWIPE_MAX_OFF_PATH = 250;
  private static final int SWIPE_THRESHOLD_VELOCITY = 200;

  @Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
    float velocityY) {
   try {
    if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
     return false;
    // right to left swipe
    if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
      && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
     if(CommonUtil.DEBUG)Log.i("test ", "left");

    } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
      && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
     if(CommonUtil.DEBUG)Log.i("test ", "right");

      }
   } catch (Exception e) {
    Log.e(TAG, "onFling error", e);
   }
   return false;
  }
}

在activity中定义GestureDetector 变量

private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;

在oncreate（）中赋值：

  gestureDetector = new GestureDetector(new MyGestureDetector());
  gestureListener = new View.OnTouchListener() {
   @Override
   public boolean onTouch(View v, MotionEvent event) {
    // TODO Auto-generated method stub
    if (gestureDetector.onTouchEvent(event)) {
     return true;
    }
    return false;
   }
  };

重写dispatchTouchEvent(MotionEvent event)方法

@Override
public boolean dispatchTouchEvent(MotionEvent event) {

  if (gestureDetector.onTouchEvent(event)) {
   event.setAction(MotionEvent.ACTION_CANCEL);
  }
  return super.dispatchTouchEvent(event);

}