Android setOnTouchListener识别滑动手势

 setOnTouchListener(new OnTouchListener() {
             private float startX, startY, offsetX, offsetY;

             @Override
             public boolean onTouch(View v, MotionEvent event) {
                 switch (event.getAction()) {
                 case MotionEvent.ACTION_DOWN:
                     startX = event.getX();
                     startY = event.getY();
                     break;
                 case MotionEvent.ACTION_UP:
                     offsetX = event.getX() - startX;
                     offsetY = event.getY() - startY;
                     if (Math.abs(offsetX) > Math.abs(offsetY)) {
                         if (offsetX < -5) { // left
                             swipeLeft();
                         } else if (offsetX > 5) { // right
                             swipeRight();
                         }
                     } else {
                         if (offsetY < -5) { // up
                             swipeUp();
                         } else if (offsetY > 5) { // down
                             swipeDown();
                         }
                     }
                     break;
                 default:
                     break;
                 }
                 return true;
             }
         });