建议Android Studios项目需要！我似乎无法使用循环将我创建的MarkerOptions列表添加到地图中，我如何解决此问题？

我已经尝试了很长一段时间，终于到了我的大脑不知道该做什么的地步。我成功地从数据库中读取了数据，并尝试使用Queries将其添加到地图中，然而，这并没有奏效。我现在所做的是将数据排序到一个数组列表中，我可以在其中循环，然后添加它——也许这种方法会奏效，但仍然没有成功。如果有人能帮助我或提供不同的解决方案，我将非常感激！

我在onCreate函数中调用QueryDatabase（）函数。

我创建了ArrayList。第一个是我将其他人加入的主要价值观，第二个是我需要的价值观。几乎就像它被打包到一个数组中。

private static ArrayList<MarkerOptions> MarkerArray = new ArrayList<MarkerOptions>();
private static ArrayList<ArrayList<String>> PackagedMarkerData = new ArrayList<>();

在这个函数中，我从一个名为“getDataArray”的数组中获取所需的数据，并将其放入局部变量中（这个函数的第1部分）

    private void QueryDatabase(){
        int lengthOfArray = DebugLog.getDataArray.size();
        try {
            for (int i = 0; i < DebugLog.getDataArray.size(); i += 6) {
                System.out.println("Crime: " + DebugLog.getDataArray.get(i));
                System.out.println("Location: " + DebugLog.getDataArray.get(i + 1));
                System.out.println("Longitude: " + DebugLog.getDataArray.get(i + 2));
                System.out.println("Latitude: " + DebugLog.getDataArray.get(i + 3));
                System.out.println("Outcome: " + DebugLog.getDataArray.get(i + 4));

                try {
                    String Crime = DebugLog.getDataArray.get(i);
                    String Location = DebugLog.getDataArray.get(i + 1);
                    String Longitude = DebugLog.getDataArray.get(i + 2);
                    String Latitdude = DebugLog.getDataArray.get(i + 3);

//                    LatLng LocationMarker = new LatLng(Latitdude, Longitude);
                    addMarker(Latitdude, Longitude, Crime, Location);
                } catch (Exception e){
                    Toast.makeText(getApplicationContext(),"UnExpected Error", Toast.LENGTH_LONG).show();
                }
            }
        } catch (Exception e) {
            Toast.makeText(getApplicationContext(),"UnExpected Error", Toast.LENGTH_LONG).show();
        }
    ...

本地变量（犯罪、位置、经度…）被解析到下一个函数，该函数将数据打包到本地ArrayList中，然后将其添加到主ArrayList（在顶部声明）

private void addMarker(String Lat, String Long, String title, String Location) {
    ArrayList<String> PackData = new ArrayList<String>();
    PackData.add(title);
    PackData.add(Location);
    PackData.add(Long);
    PackData.add(Lat);
    PackagedMarkerData.add(PackData);
    System.out.println(PackagedMarkerData.size());
}

数据在ArrayList中（成为2D阵列）后，Im循环通过它并添加到地图（mMap）。我已经执行了system.out.println命令来检查数组是否已填充，并且它们已填充，主要问题是它没有添加到映射中，这是我希望解决的问题。下面的代码是上面函数的第2部分。

...
for (int counter = 0; counter < PackagedMarkerData.size(); counter ++){
    try{
        for (int dataCounter = 0; dataCounter < 50; dataCounter++){
            MarkerOptions markerOptions = new MarkerOptions();
            LatLng LocationData = new LatLng(Double.parseDouble(PackagedMarkerData.get(counter).get(3)),
                    Double.parseDouble(PackagedMarkerData.get(counter).get(2)));
            markerOptions
                    .title(PackagedMarkerData.get(counter).get(0))
                    .snippet(PackagedMarkerData.get(counter).get(1))
                    .position(LocationData);
            mMap.addMarker(markerOptions);
        }
    } catch (Exception e){
        Toast.makeText(getApplicationContext(),"UnExpected Error", Toast.LENGTH_LONG).show();
    }
}

这是完整的代码。我希望有人能帮忙解决这个问题！

private static ArrayList<MarkerOptions> MarkerArray = new ArrayList<MarkerOptions>();
private static ArrayList<ArrayList<String>> PackagedMarkerData = new ArrayList<>();

    private void QueryDatabase(){
        int lengthOfArray = DebugLog.getDataArray.size();
        try {
            for (int i = 0; i < DebugLog.getDataArray.size(); i += 6) {
                System.out.println("Crime: " + DebugLog.getDataArray.get(i));
                System.out.println("Location: " + DebugLog.getDataArray.get(i + 1));
                System.out.println("Longitude: " + DebugLog.getDataArray.get(i + 2));
                System.out.println("Latitude: " + DebugLog.getDataArray.get(i + 3));
                System.out.println("Outcome: " + DebugLog.getDataArray.get(i + 4));

                try {
                    String Crime = DebugLog.getDataArray.get(i);
                    String Location = DebugLog.getDataArray.get(i + 1);
                    String Longitude = DebugLog.getDataArray.get(i + 2);
                    String Latitdude = DebugLog.getDataArray.get(i + 3);

//                    LatLng LocationMarker = new LatLng(Latitdude, Longitude);
                    addMarker(Latitdude, Longitude, Crime, Location);
                } catch (Exception e){
                    Toast.makeText(getApplicationContext(),"UnExpected Error", Toast.LENGTH_LONG).show();
                }
            }
        } catch (Exception e) {
            Toast.makeText(getApplicationContext(),"UnExpected Error", Toast.LENGTH_LONG).show();
        }

        for (int counter = 0; counter < PackagedMarkerData.size(); counter ++){
            try{
                for (int dataCounter = 0; dataCounter < 50; dataCounter++){
                    MarkerOptions markerOptions = new MarkerOptions();
                    LatLng LocationData = new LatLng(Double.parseDouble(PackagedMarkerData.get(counter).get(3)),
                            Double.parseDouble(PackagedMarkerData.get(counter).get(2)));
                    markerOptions
                            .title(PackagedMarkerData.get(counter).get(0))
                            .snippet(PackagedMarkerData.get(counter).get(1))
                            .position(LocationData);
                    mMap.addMarker(markerOptions);
                }
            } catch (Exception e){
                Toast.makeText(getApplicationContext(),"UnExpected Error", Toast.LENGTH_LONG).show();
            }
        }
    }

    private void addMarker(String Lat, String Long, String title, String Location) {
        ArrayList<String> PackData = new ArrayList<String>();
        PackData.add(title);
        PackData.add(Location);
        PackData.add(Long);
        PackData.add(Lat);
        PackagedMarkerData.add(PackData);
        System.out.println(PackagedMarkerData.size());
    }