Android监测手指上下左右滑动屏幕

在开发android程序时，有时会需要监测手指滑动屏幕，当手指朝上下左右不同方向滑动时做出不同的响应，那怎么去实现呢？

利用Android提供的手势监测器就可以很方便的实现，直接上代码（已测试通过）

public class CbMainActivity extends Activity implements  android.view.GestureDetector.OnGestureListener
{
	//定义手势检测器实例
	GestureDetector detector;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.cb_main);
        //创建手势检测器
        detector = new GestureDetector(this,this);
    }

    //将该activity上的触碰事件交给GestureDetector处理
    public boolean onTouchEvent(MotionEvent me){
    	return detector.onTouchEvent(me);
    }

	@Override
	public boolean onDown(MotionEvent arg0) {
		return false;
	}

	/**
	 * 滑屏监测
	 *
	 */
	@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {
		float minMove = 120;         //最小滑动距离
		float minVelocity = 0;      //最小滑动速度
		float beginX = e1.getX();
		float endX = e2.getX();
		float beginY = e1.getY();
		float endY = e2.getY();

		if(beginX-endX>minMove&&Math.abs(velocityX)>minVelocity){   //左滑
			Toast.makeText(this,velocityX+"左滑",Toast.LENGTH_SHORT).show();
		}else if(endX-beginX>minMove&&Math.abs(velocityX)>minVelocity){   //右滑
			Toast.makeText(this,velocityX+"右滑",Toast.LENGTH_SHORT).show();
		}else if(beginY-endY>minMove&&Math.abs(velocityY)>minVelocity){   //上滑
			Toast.makeText(this,velocityX+"上滑",Toast.LENGTH_SHORT).show();
		}else if(endY-beginY>minMove&&Math.abs(velocityY)>minVelocity){   //下滑
			Toast.makeText(this,velocityX+"下滑",Toast.LENGTH_SHORT).show();
		}

		return false;
	}

	@Override
	public void onShowPress(MotionEvent arg0) {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean onSingleTapUp(MotionEvent arg0) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public void onLongPress(MotionEvent arg0) {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean onScroll(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {

		return false;
	}

}