我可以从以下方式获得触摸的坐标:

event.getX();
event.getY();


但我想从0,0的原点开始。

因此,我可以触摸屏幕上的任何位置,当我向上拖动手指时,它将以1的增量增加Y,当我向右拖动手指时,X将以1的增量增加。将X减小-1,向下移动将Y减小-1。

有没有一种数学方法可以做到这一点,或者有更好的类或函数?

任何指导将不胜感激!谢谢!

最佳答案

只需使用:

event.getRawX();
event.getRawY();


产生屏幕坐标,
0,0开始(左上角)
width,height(右下角)
取决于设备,但我认为这对您来说并不新鲜;)

-更新-
我想我误会了你,对不起。

然后试试这个:

int saved_x = -1;
int saved_y = -1;

@Override
public boolean onTouchEvent(MotionEvent event)
{
    final int action = event.getAction();
    final int pointer_index = (action & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
    int pid = event.getPointerId(pointer_index);

    int x = (int)event.getX();
    int y = (int)event.getY();

    switch (action & MotionEvent.ACTION_MASK)
    {
        case MotionEvent.ACTION_DOWN:
            saved_x = x;
            saved_y = y;
            break;

        case MotionEvent.ACTION_MOVE:
            int relative_x = x - saved_x;
            int relative_y = y - saved_y;

            //move right --> relative_x increases by 'm' pixels of movement
            //move left  --> relative_x decreases by 'm' pixels of movement
            //move down  --> relative_y increases by 'm' pixels of movement
            //move up    --> relative_y decreases by 'm' pixels of movement

            //use it :D
            break;

        case MotionEvent.ACTION_UP:
            saved_x = -1; //-1 indicates "no finger on screen" -- just a feature :)
            saved_y = -1; //-1 indicates "no finger on screen" -- just a feature :)
            break;
    }

    return true;
}


我希望这就是您想要的:)

10-08 15:11