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android maps显示了多个标记(来自sqlite的LatLng)

android-maps google-maps-markers sqlite android

-1

ghasem deh · 技术社区 · 7 年前

我在android应用程序中使用谷歌地图和get(用户)设备位置(GPS位置),并将其插入数据库(SQLite)经纬度和地址!

现在我想显示多个位置与LatLng读取从数据库…没有问题,在创建标记,但在标记信息(国家,城市…)只显示最后插入的所有标记的位置!

这是我的代码:

private void displayMultiplePoint() {
        if (LOCATION_TABLE.size() > 0) {
            for (int i = 0; LOCATION_TABLE.size() > i; i++) {
                int id = LOCATION_TABLE.get(i).getId();
                lat = LOCATION_TABLE.get(i).getLatitude();
                lng = LOCATION_TABLE.get(i).getLongitude();
                place = LOCATION_TABLE.get(i).getPlace();
                rate = LOCATION_TABLE.get(i).getRate();
                drawMarker(new LatLng(lat, lng), "city", place, rate);
                displayToast(id + "" + place);
            }
        }
    }

    private void drawMarker(final LatLng point, final String city, final String place, final float rate) {
        mMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
            @Override
            public View getInfoWindow(Marker arg0) {
                return null;
            }

            @Override
            public View getInfoContents(Marker arg0) {
                View v = null;
                try {
                    v = getLayoutInflater().inflate(R.layout.custom_info_contents, null);
                    ImageView map_image = (ImageView) v.findViewById(R.id.maps_image);
                    map_image.setImageResource(R.drawable.runhd);
                    TextView city_txt = (TextView) v.findViewById(R.id.maps_city);
                    city_txt.setText(city);
                    TextView place_txt = (TextView) v.findViewById(R.id.maps_place);
                    place_txt.setText(place);
                    RatingBar rate_bar = (RatingBar) v.findViewById(R.id.exercise_display_rate);
                    rate_bar.setRating(rate);
                } catch (Exception ev) {
                    System.out.print(ev.getMessage());
                }
                return v;
            }
        });
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(point);
        mMap.addMarker(markerOptions);
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(point, 6));
    }

我在数据库中显示了lcation表中的toast form rowId,并显示了3行id:1、2、3,但在marker info中显示了最后一个id(id号:3)

这是我的片段:

3 回复 | 直到 7 年前

user6490462 user6490462 7 年前

对于您的案例,我有很多解决方案,但首先:

你的坠落 setInfoWindowAdapter 方法只是 调用一次 drawMarker

 for (int i = 0; LOCATION_TABLE.size() > i; i++) {
            int id = LOCATION_TABLE.get(i).getId();
            lat = LOCATION_TABLE.get(i).getLatitude();
            lng = LOCATION_TABLE.get(i).getLongitude();
            place = LOCATION_TABLE.get(i).getPlace();
            rate = LOCATION_TABLE.get(i).getRate();
            drawMarker(new LatLng(lat, lng), "city", place, rate);
            displayToast(id + "" + place);
            ..........
             @Override
        public View getInfoContents(Marker arg0) {
            View v = null;
            try {
                v = getLayoutInflater().inflate(R.layout.custom_info_contents, null);
                ImageView map_image = (ImageView) v.findViewById(R.id.maps_image);
                map_image.setImageResource(R.drawable.runhd);
                TextView city_txt = (TextView) v.findViewById(R.id.maps_city);
                city_txt.setText("city");
                TextView place_txt = (TextView) v.findViewById(R.id.maps_place);
                place_txt.setText(place);
                RatingBar rate_bar = (RatingBar) v.findViewById(R.id.exercise_display_rate);
                rate_bar.setRating(rate);
            } catch (Exception ev) {
                System.out.print(ev.getMessage());
            }
            return v;
            ......
        }

使用 Cursor 通过你的数据库,在任何地方使用它(这将是了不起的)。

第三 Clustering 中的算法 google_maps-utils-example .

BhalchandraSW 7 年前

setInfoWindowAdapter() 为整个地图设置信息窗口。在…内 setInfoWindowAdapter()

您需要维护一个标记到数据的映射。
```
Map<Marker, Place> markerToPlaceMap = new HashMap<>();
```
Place
```
class Place {
    public String city, place;
    public float rating;
}
```
注意:请将成员更改为private,并根据您的适合性实现getter和setter。

接下来,你的 drawMarker() 将更改如下。它需要添加 marker place 到 markerToPlace 地图

private void drawMarker(final LatLng point, final String city, final String place, final float rate) {
    MarkerOptions markerOptions = new MarkerOptions();
    markerOptions.position(point);
    Marker marker = mMap.addMarker(markerOptions);
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(point, 6));
    markerToPlaceMap.put(marker, new Place(city, place, rating));
}

最后,您将覆盖 GoogleMap.setInfoWindowAdapter() 位置 与a相关 标记

mMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {

    @Override
    public View getInfoWindow(Marker marker) {
        return null;
    }

    @Override
    public View getInfoContents(Marker marker) {
        View v = null;
        try {

            v = getLayoutInflater().inflate(R.layout.custom_info_contents, null);

            ImageView map_image = (ImageView) v.findViewById(R.id.maps_image);
            map_image.setImageResource(R.drawable.runhd);

            TextView city_txt = (TextView) v.findViewById(R.id.maps_city);
            city_txt.setText(markerToPlace.get(marker).city); // <- Check how corresponding place for a marker is fetched and used

            TextView place_txt = (TextView) v.findViewById(R.id.maps_place);
            place_txt.setText(markerToPlace.get(marker).place);

            RatingBar rate_bar = (RatingBar) v.findViewById(R.id.exercise_display_rate);
            rate_bar.setRating(markerToPlace.get(marker).rate);

        } catch (Exception ev) {
            System.out.print(ev.getMessage());
        }
        return v;
    }
});

ghasem deh 7 年前

但是我的代码更改为:

private void displayMultiplePoint() {
        Cursor cursor = DB_HELPER.LOCATION_MARKERS();
        if (cursor.moveToFirst()) {
            for (int i = 0; cursor.getCount() > i; i++) {
                int id = cursor.getInt(cursor.getColumnIndex("id"));
                double lat = cursor.getDouble(cursor.getColumnIndex("latitude"));
                double lng = cursor.getDouble(cursor.getColumnIndex("longitude"));
                String place = cursor.getString(cursor.getColumnIndex("place"));
                float rate = cursor.getFloat(cursor.getColumnIndex("rate"));
                displayToast(id + ", " + place + rate);
                cursor.moveToNext();
                drawMarker(new LatLng(lat, lng));
            }
            cursor.close();
        }
    }

我得到arg0.getId表单:(m0,m1,m2…)

public View getInfoContents(Marker arg0)