Java 需要从索引号获取我的arraylist中的点的坐标，并存储在新的arraylist中

我目前有一个程序，告诉用户当他们点击屏幕时，我的arraylist中最接近的点。当前，将显示一个toast，告诉他们在arraylist中最接近的点的索引号。 我需要能够得到该索引处的值，即要放入新arraylist的点的坐标。mPoints是具有点（100100）、（400100）、（100400）和（400400）的阵列列表。我尝试将NPCords设置为索引的值，但这不起作用

   float Cox = event.getX();
              float Coy = event.getY();

              double CoX = (double) Cox;
              double CoY = (double) Coy;
              //the euclid method only accepts double numbers therefore the coordinates of the
              //points the user is clicking on need to be converted from float to double


              Double NearestDistance = 1000.12; //this is hardcoded for the sake of declaring the variable.
              int NearestPoint = -1; //this is hardcoded for the sake of declaring the variable.

              int NPCords = 0;
              for (int i = 0; i < mPoints.size(); i++) {
                  double xi;
                  double yi;
                  double dis;
                  xi = mPoints.get(i).x;
                  yi = mPoints.get(i).y;

                  dis = Euclid(CoX, CoY, xi, yi);
                  if (dis < NearestDistance) {
                      NearestPoint = i;
                      NearestDistance = dis;
                  }
                 // NPCords = Array.getInt(mPoints, NearestPoint);


              }

              String text = "the closest point to where you clicked is: " + NearestPoint + " and the coordinates are: " + NPCords;
              Toast.makeText(mContext, text, LENGTH_SHORT).show();

float-Cox=event.getX（）；
float Coy=event.getY（）；
双环氧化酶=（双）环氧化酶；
双CoY=（双）CoY；
//欧几里德方法只接受双精度数，因此
//用户单击的点需要从浮点转换为双精度
双最近距离=1000.12//这是为了声明变量而硬编码的。
int最近点=-1//这是为了声明变量而硬编码的。
int=0；
对于（int i=0；i

试试这个

String text = "the closest point to where you clicked is: " + NearestPoint + " and the coordinates are: (" + mPoints.get(NearestPoint).x + ", " + mPoints.get(NearestPoint).y + ")";

尝试以下操作（我假设mPoints是一个点列表）

我已经更改了一些变量名以匹配Java代码约定

        double cox = (double)event.getX();
        double coy = (double)event.getY();

        Double nearestDistance = 1000.12; // this is hardcoded for the sake
                                            // of declaring the variable.
        Point nearestPoint = null;

        for (int i = 0; i < mPoints.size(); i++) {
            Point current = mPoints.get(i);
            double xi = current.x;
            double yi = current.y;

            double dis = Euclid(cox, coy, xi, yi);
            if (dis < nearestDistance) {
                nearestDistance = dis;
                nearestPoint = current;
            }
        }

        String text = "the closest point to where you clicked is: "
                + nearestPoint + " and the coordinates are: "
                + nearestPoint.x + ", " + nearestPoint.y;
        Toast.makeText(mContext, text, LENGTH_SHORT).show();

double-cox=（double）event.getX（）；
double coy=（double）event.getY（）；
双最近距离=1000.12；//为了安全起见，这是硬编码的
//声明变量的方法。
最近点=空；
对于（int i=0；i

---

请注意，您必须检查空值，因为最近点可以为空

谢谢！就在我看到你的答案之前，我找到了一种方法，但这比我的解决方案更干净。