Question

我正在尝试为驱动程序模型中的每个驱动程序添加标记，并将其加载到数组列表中。当我举起结果时，我得到了所有的驱动程序，但标记只显示了一个驱动程序。

请帮助我获取模块中每个驱动程序的标记。

//Add markers for all drivers retrieved
private void addMarkers(List<Driver> drivers) {
  if (map != null && !drivers.isEmpty()) {
    for (int i = 0; i < drivers.size(); i++) {
      //Get driver model
      Driver driver = drivers.get(i);

      Toast.makeText(this, driver.toString(), Toast.LENGTH_LONG).show();

      //Add marker
      GeoPoint driverLocation = driver.getGeoPoint();

      if (driverMarker == null) {
        driverMarker = map.addMarker(new MarkerOptions()
        .title(driver.getCarNumber())
        .position(new LatLng(driverLocation.getLatitude(), driverLocation.getLongitude()))
        );
        driverMarker.showInfoWindow();
      }
      else{
        driverMarker.remove();
        driverMarker = map.addMarker(new MarkerOptions()
        .title(driver.getCarNumber())
        .position(new LatLng(driverLocation.getLatitude(), driverLocation.getLongitude()))
        );
        driverMarker.showInfoWindow();
      }
    }
  }
}

Answer 1

您只获得一个标记，因为您在代码中反复添加和删除相同的标记：

for (int i = 0; i < drivers.size(); i++) {

    if (driverMarker == null) {
       driverMarker = map.addMarker(...);
    } else {
       driverMarker.remove();
       ...
    }
}

因此，您需要稍微更改代码以添加每个标记并将其保存到列表中。像这样：

private void addMarkers(List<Driver> drivers) {
  List<Marker> markers = new ArrayList<>();

  if (map != null && !drivers.isEmpty()) {
    for (int i = 0; i < drivers.size(); i++) {
      //Get driver model
      Driver driver = drivers.get(i);

      //Add marker
      GeoPoint driverLocation = driver.getGeoPoint();

      Marker driverMarker = map.addMarker(new MarkerOptions()
        .title(driver.getCarNumber())
        .position(new LatLng(driverLocation.getLatitude(), driverLocation.getLongitude())));

      driverMarker.showInfoWindow();

      // add to the list
      markers.add(driverMarker);
     }
   }

   return markers;
}

然后您可以使用该方法获取标记列表：

// assumet drivers is list of Driver
List<Marker> markers = addMarkers(drivers);

从arrayllist中添加标记

1 个答案: