从数组列表中添加标记

Question

我正在尝试为加载到数组列表中的驱动程序模型中的每个驱动程序添加标记。当我敬酒结果时，我得到了所有驱动程序，但标记只显示了一个驱动程序。

请帮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

您只会得到一个标记，因为您在代码中一次又一次地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;
}

然后你可以使用方法获取标记列表：

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

从数组列表中添加标记

adding in markers from a arrayllist

android

marker