Android 滑动手势简单使用方法

用法:首先让指定的Activity实现Android.view.OnGestureListener,然后在你需要调用GestureDetector的View上,添加onTouchListener,之后setLongClickable(true)即可.

如:

customView.setOnTouchListner(xxxListener);

customView.setLongClickable(true);

之后就可以在onFling方法中设置你想要的手势.

onFling方法参数解释:

onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY)

官方解释:

Notified of a fling event when it occurs with the initial on down

MotionEvent

and the matching up

MotionEvent

. The calculated velocity is supplied along the x and y axis in pixels per second.

Specified by: onFling(...) in
OnGestureListener
Parameters:e1 The first down motion event that started the fling.e2 The move motion event that triggered the current onFling.velocityX The velocity of this fling measured in pixels per second along the x axis.velocityY The velocity of this fling measured in pixels per second along the y axis.Returns:true if the event is consumed, else false
大致意思:
e1代表手指按下的瞬间触发的事件,

e2代表手指未弹起,移动时触发的事件

剩下两个参数大致意思是每秒钟在x,y方向上移动的像素点数.

所以,通过e1和e2即可创造出手势的判断条件.

简单左右滑动手势代码:

@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {
		// TODO Auto-generated method stubto
		if (e1.getX() > e2.getX()) {
			Log.i("msg", "<<<<<<<<<");
		} else {
			Log.i("msg", ">>>>>>>>>");
		}
		Toast.makeText(this, "Fling", 0).show();
		return false;
	}