如何将数据从 Sqlite 加载到 google maps v2 标记？

Question

我已经保存了应用重启后重新加载标记所需的所有相关信息。现在的问题是它只是重新加载标题和片段，而不是与该标记关联的图像：

所以在我的数据库中，这是保存的内容：（在 = 之后保存的值和 () 中的列名

Column 1 = 1 (id)
column 2 = xx.xxx (lng)
column 3 = xx.xxx (lat)
column 4 = 9.0 (zoom)
column 5 = test (title)
column 6 = marker (snippet)
column 7 = m12 (marker id)
column 8 = /storage/emulated/0/Images/myimage_yyyymmdd_hhmmss.jpg (imagepath)

因此，如您所见，所有信息都已保存，以使用标题、片段、缩放级别以及图像和经纬度点重新加载标记。

但是，当重新启动地图时，标记会显示在带有标题和摘要的正确位置，但不会显示图像（图像显示在 CustomInfoWindow

下面是保存和检索值的代码：

contentValues.put(LocationsDB.FIELD_LAT, point.latitude);
contentValues.put(LocationsDB.FIELD_LNG, point.longitude);
contentValues.put(LocationsDB.FIELD_ZOOM, googleMap.getCameraPosition().zoom);
contentValues.put(LocationsDB.FIELD_TITLE, title.getText().toString());
contentValues.put(LocationsDB.FIELD_SNIPPET, snippet.getText().toString());
contentValues.put(LocationsDB.FIELD_IMAGE, markerId);
contentValues.put(LocationsDB.FIELD_FILEPATH, image.getAbsolutePath());
.....
@Override
public void onLoadFinished(Loader<Cursor> arg0, Cursor arg1) {
int locationCount = 0;
double lat=0;
double lng=0;
float zoom=0;
String title = null;
String snippet = null;
String id = null;
String filep = null;
locationCount = arg1.getCount();
arg1.moveToFirst();

for(int i=0;i<locationCount;i++){
  lat = arg1.getDouble(arg1.getColumnIndex(LocationsDB.FIELD_LAT));
  lng = arg1.getDouble(arg1.getColumnIndex(LocationsDB.FIELD_LNG));
  zoom = arg1.getFloat(arg1.getColumnIndex(LocationsDB.FIELD_ZOOM));
  title = arg1.getString(arg1.getColumnIndex(LocationsDB.FIELD_TITLE));
  snippet = arg1.getString(arg1.getColumnIndex(LocationsDB.FIELD_SNIPPET));
  id = arg1.getString(arg1.getColumnIndex(LocationsDB.FIELD_IMAGE));
  filep = arg1.getString(arg1.getColumnIndex(LocationsDB.FIELD_FILEPATH));
  thePoint = new LatLng(lat, lng);
  drawMarker(thePoint, title, snippet, id, filep);
  View v  = getLayoutInflater().inflate(R.layout.infowindow_layout, null);
  ImageView markerIcon = (ImageView) v.findViewById(R.id.marker_icon);
  Bitmap myImage = BitmapFactory.decodeFile(filep);
  markerIcon.setImageBitmap(myImage);
  arg1.moveToNext();

  }

  if(locationCount>0){
    googleMap.moveCamera(CameraUpdateFactory.newLatLng(new LatLng(lat,lng)));
    googleMap.animateCamera(CameraUpdateFactory.zoomTo(zoom));
       }
        }

以及在地图上绘制标记时：

private void drawMarker(LatLng point, String title, String snippet, String id, String filep) {
Marker marker = googleMap.addMarker(new MarkerOptions()
    .title(title)
    .snippet(snippet)
    .position(thePoint));
    markerId = marker.getId();
}

那么我在这里做错了什么，当标记绘制时我需要以某种方式说出加载 ID 和图像路径吗？

有人可以帮我解释一下吗？

谢谢

Answer 1

试试这些改变：

    for(int i=0;i<locationCount;i++){
      lat = arg1.getDouble(arg1.getColumnIndex(LocationsDB.FIELD_LAT));
      lng = arg1.getDouble(arg1.getColumnIndex(LocationsDB.FIELD_LNG));
      zoom = arg1.getFloat(arg1.getColumnIndex(LocationsDB.FIELD_ZOOM));
      title = arg1.getString(arg1.getColumnIndex(LocationsDB.FIELD_TITLE));
      snippet = arg1.getString(arg1.getColumnIndex(LocationsDB.FIELD_SNIPPET));
      id = arg1.getString(arg1.getColumnIndex(LocationsDB.FIELD_IMAGE));
      filep = arg1.getString(arg1.getColumnIndex(LocationsDB.FIELD_FILEPATH));
      thePoint = new LatLng(lat, lng);
      BitmapDescriptor yourImage = BitmapDescriptorFactory.fromPath(filep);
      /*
      * Use BitmapDescriptor.fromPath(FILE_PATH) to create a bitmap descriptor from an absolute file path.
      * Or BitmapDescriptor.fromFile(NAME), if you have the name of an image file located in the internal storage
      */
      drawMarker(thePoint, title, snippet, id, filep, yourImage);
      arg1.moveToNext();

   }

在你的方法中：

private void drawMarker(LatLng point, String title, String snippet, String id, String filep, BitmapDescriptor image) {
Marker marker = googleMap.addMarker(new MarkerOptions()
    .title(title)
    .snippet(snippet)
    .icon(image)
    .position(thePoint));
    markerId = marker.getId();
}

如何将数据从 Sqlite 加载到 google maps v2 标记？

How to load data from Sqlite to google maps v2 marker?

sqlite

android

google-maps