[原创] 如何在android中实现swipe的手势功能及页面拖动动画

tv.setOnTouchListener(new OnTouchListener() {
			float x_down = -1;
			float x_up = -1;
			float f_down = -1;
			float f_up = -1;

			public boolean onTouch(View v, MotionEvent event) {

				if (event.getAction() == MotionEvent.ACTION_DOWN) {
					x_down = event.getRawX();
					if (x_down != -1) {
						f_down = x_down;
					}
				}
				if (event.getAction() == MotionEvent.ACTION_UP) {
					x_up = event.getRawX();
					if (x_up != -1) {
						f_up = x_up;
					}
				}
				if (x_up != -1 && x_down != -1) {
					
					System.out.println(f_down + "     " + f_up);

					if (f_down - f_up > 50) {
						System.out.println("上一页");
					} else if (f_down - f_up < -50) {
						System.out.println("下一页");
					}
					f_down = -1;
					f_up = -1;
					x_down = -1;
					x_up = -1;
				}
				return true;
			}
		});