如何获取多个纬度和经度值并在地图上用标记进行标记

Question

我想在服务器上调出经纬度，在google map上用记号笔做标记，怎么办？

stopMapActivity



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_stop_map);
        nextBtn = findViewById(R.id.addRouteButton);

        FragmentManager fragmentManager = getFragmentManager();
        MapFragment mapFragment = (MapFragment) fragmentManager
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);


        ssm = new ServerSideMethods(this,false);
        stop_list = new ArrayList<stop_list_item>();

        new Thread(new Runnable(){
            @Override
            public void run() {
                Message msg = new Message();
                msg.what = 0;
                try{
                    stop_list = ssm.getCarStopList(17900);
                    msg.what = 1;
                    for (int i = 0; i < stop_list.size(); i++) {
                        MarkerOptions makerOptions = new MarkerOptions();
                        makerOptions
                                .position(new LatLng(stopListArray.get(i).get("x"), stopListArray.get(i).get("y")))
                                .title(stopListArray.get(i).get("stop_name"));

                        mGoogleMap.addMarker(makerOptions);
                    }
                }catch (Exception e){
                    Log.e("[HB]"+this.getClass().getName(),"Error:"+e.toString());
                    msg.what = 0;
                }
            }
        }).start();


    }

错误：不兼容的类型：字符串无法转换为双精度 (.position(new LatLng(stopListArray.get(i).get("x"), stopListArray.get(i).get("y"))))此行）serveridemethod 中的代码太长，无法仅发布所需的部分，而 mapactivity 是整个代码。

此代码将生成此错误 是否有可能得到一些帮助？

Answer 1

您的问题在您的 for 循环中，您试图将字符串作为 List 的 get() 函数传递：

 for (int i = 0; i < stop_list.size(); i++) {
                    MarkerOptions makerOptions = new MarkerOptions();
                    makerOptions
                            .position(new LatLng(stopListArray.get("x"), stopListArray.get("y")))
                            .title(stopListArray.get(i).get("stop_name")); 

                    mGoogleMap.addMarker(makerOptions);
                }

应该是：

 for (int i = 0; i < stop_list.size(); i++) {
                    MarkerOptions makerOptions = new MarkerOptions();
                    makerOptions
                            .position(new LatLng(Double.parseDouble(stopListArray.get(i).get("x")), Double.parseDouble(stopListArray.get(i).get("y"))))
                            .title(stopListArray.get(i).get("stop_name")); 

                    mGoogleMap.addMarker(makerOptions);
                }