Android 获取触摸点坐标，判断滑动方向，滑动距离，滑动速度，缩放手势

原创已于 2023-06-02 15:43:05 修改 · 2w 阅读

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文章标签：

#触摸 #坐标 #手指滑动方向 #滑动速度 #缩放手势

于 2018-07-20 15:28:21 首次发布

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本文介绍如何在Android中使用View.OnTouchListener接口处理触摸事件，包括按下、移动、抬起等操作，并演示了如何实现滑动方向判断及缩放手势检测。

activity 或 fragment 实现接口 View.OnTouchListener

如：public class MyFragment extends Fragment implements View.OnTouchListener{

重写实现方法

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        //继承了Activity的onTouchEvent方法，直接监听点击事件
        if(event.getAction() == MotionEvent.ACTION_DOWN) {
            //当手指按下的时候
            x1 = event.getX();
            y1 = event.getY();
        }
        if(event.getAction() == MotionEvent.ACTION_MOVE) {
            //当手指移动的时候
            x2 = event.getX();
            y2 = event.getY();
            if(y1 - y2 > 50) {
                Toast.makeText(MyServiceTestActivity.this, "向上滑", Toast.LENGTH_SHORT).show();
            } else if(y2 - y1 > 50) {
                Toast.makeText(MyServiceTestActivity.this, "向下滑", Toast.LENGTH_SHORT).show();
            } else if(x1 - x2 > 50) {
                Toast.makeText(MyServiceTestActivity.this, "向左滑", Toast.LENGTH_SHORT).show();
            } else if(x2 - x1 > 50) {
                Toast.makeText(MyServiceTestActivity.this, "向右滑", Toast.LENGTH_SHORT).show();
            }
        }
        if (event.getAction()==MotionEvent.ACTION_UP){
            Log.i("Lgq","sssssssll离开了lllll==");
//            updview(nowpersion);
        }
        return super.onTouchEvent(event);
//        return false;
    }

view设置监听

slv = (ScrollListenerView)findViewById(R.id.slv);

slv.setOnTouchListener(this);

分发二：重写方法

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    if (ev.getAction()==MotionEvent.ACTION_UP){
        LgqLogutil.e("动啦啦啦啦");
    }
    return super.dispatchTouchEvent(ev);
}

滑动速度：放在MotionEvent.ACTION_MOVE里

VelocityTracker mVelocityTracker = VelocityTracker.obtain();

mVelocityTracker.addMovement(ev);

mVelocityTracker.computeCurrentVelocity(1000);

float xVelocity = mVelocityTracker.getXVelocity();//速度
xVelocity = Math.abs(xVelocity);//去绝对值。向左滑，值为负数

获取最多速度

float  sudu;

if (sudu < xVelocity) {
    sudu = xVelocity;
}

缩放手势获取

double nLenStart = 0;

@Override
public boolean onTouchEvent(MotionEvent event) {

    int nCnt = event.getPointerCount();

    if ((event.getAction() & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_POINTER_DOWN && 2 == nCnt)//<span style="color:#ff0000;">2表示两个手指</span>
    {

        for (int i = 0; i < nCnt; i++) {
            float x = event.getX(i);
            float y = event.getY(i);

            Point pt = new Point((int) x, (int) y);

        }

        int xlen = Math.abs((int) event.getX(0) - (int) event.getX(1));
        int ylen = Math.abs((int) event.getY(0) - (int) event.getY(1));

        nLenStart = Math.sqrt((double) xlen * xlen + (double) ylen * ylen);


    } else if ((event.getAction() & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_POINTER_UP && 2 == nCnt) {

        for (int i = 0; i < nCnt; i++) {
            float x = event.getX(i);
            float y = event.getY(i);

            Point pt = new Point((int) x, (int) y);

        }

        int xlen = Math.abs((int) event.getX(0) - (int) event.getX(1));
        int ylen = Math.abs((int) event.getY(0) - (int) event.getY(1));

        double nLenEnd = Math.sqrt((double) xlen * xlen + (double) ylen * ylen);

        if (nLenEnd > nLenStart)//通过两个手指开始距离和结束距离，来判断放大缩小
        {
            LgqLogPlus.e("放大");
            setZoom();
        } else {
            LgqLogPlus.e("缩小");
            setZoomjian();
        }
    }
    return super.onTouchEvent(event);
}