getTag（）返回null

Question

在我的代码中，我有两个活动，第一个活动显示Maker在地图上，第二个活动显示关于该标记的信息。在异步任务中，我搜索某个位置，并将信息对象作为标记添加到Maker。就像我们一样

maker.setTag(obj); 

当我单击marker时，调用onMarkerclick()，并通过调用marker上的getTag（）获得obj，第二个活动开始并显示详细信息

@Override
public boolean onMarkerClick(Marker marker) {

    if (marker.getTag().toString().equals("JobSeeker")) {
   // this is user current location show i dont want to do anything when marker is clicked
        return false;
    }



    if (previousMarker != null && previousMarker.equals(marker)) {
   //this code is executed if marker is clicked second time

        LinkedTreeMap jobPost = (LinkedTreeMap) marker.getTag();
        marker.setTag(jobPost);
        Intent intent = new Intent(this, JobSearchResultActivity.class);
        intent.putExtra("JobPost", jobPost);

        Toast.makeText(this, "jobPostdetails" , Toast.LENGTH_SHORT).show();
        startActivity(intent);
    } else {
    // just showing some toast that marker is selected
        previousMarker = marker;
        Toast.makeText(this, "selected" , Toast.LENGTH_SHORT).show();
        marker.showInfoWindow();

    }

    return false;
}

Answer 1

我想你得重新加载标记数据。例如

map.clear();
...
List<CustomModel> models = getModels();
foreach( CustomModels m : models ){
  Marker marker = googleMap.addMarker(
  new MarkerOptions()
      .position(m.getLocation())
      .icon(BitmapDescriptorFactory.fromResource(R.drawable.img_userpin)));
 marker.setTag(m);
}