Question

我正在android中创建一个MapFragment;地图显示正常（虽然打开需要10秒），但没有显示标记。

这是片段的代码：

public class VehiclesMapFragment extends MapFragment implements OnMapReadyCallback  {

GoogleMap _map;

private void setUpMapIfNeeded() {

    if (_map == null) {

        _map = this.getMap();
        //_map = this.getMap();
        //if (_map != null) {
        final Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                ReDrawList(_vehicles);
            }
        }, 2000);
        //}
    }
}

@Override
public void onMapReady(GoogleMap googleMap) {
    _map = googleMap;


    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            ReDrawList(_vehicles);
        }
    }, 10000);

}



public VehiclesMapFragment() {

}

VehiclesPosition[] _vehicles = null;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    _vehicles = (VehiclesPosition[])getArguments().getSerializable("VEHICLES");

    //setUpMapIfNeeded();

}



public void ReDrawList(VehiclesPosition[] vehicles)
{
    if (vehicles != null && vehicles.length > 0 && _map != null) {

        LatLngBounds bounds = null;
        for (VehiclesPosition vp : vehicles) {
            LatLng latlngPos = vp.GetMapLatLng();

            if (bounds == null)
                bounds = new LatLngBounds(latlngPos, latlngPos);
            else
                bounds = bounds.including(latlngPos);

            MarkerOptions mi = vp.GetMapMarker();
            Marker mm = _map.addMarker(mi);
            mm.showInfoWindow();

        }

        try{
            _map.animateCamera(CameraUpdateFactory.zoomTo(12));
            _map.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds,100));
        }catch (Exception exx) {

        }
    }
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    View v =  inflater.inflate(R.layout.fragment_vehicles_map, container, false);
    setUpMapIfNeeded();
    return v;
}



@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);

    //setUpMapIfNeeded();

    try {
        mListener = (OnFragmentInteractionListener) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString()+ " must implement OnFragmentInteractionListener");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

@Override
public void onResume() {
    super.onResume();
}

private OnFragmentInteractionListener mListener;

public interface OnFragmentInteractionListener {
    public void onFragmentInteraction(Uri uri);
}

}

这是布局文件：

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/map"
tools:context=".MapsActivity"
android:name="com.google.android.gms.maps.SupportMapFragment" />

并且片段由活动实例化，其中包含：

Bundle args = new Bundle();
args.putSerializable("VEHICLES",_VehiclesList);
fragment_units_map = new VehiclesMapFragment();
_fragment_units_map.setArguments(args);

调用_map.animateCamera会在每次调用时产生异常： java.lang.IllegalStateException：使用newLatLngBounds时出错（LatLngBounds，int）：地图大小不能为0.很可能，地图视图尚未出现布局。要么等到布局发生，要么使用newLatLngBounds（LatLngBounds，int，int，int），它允许你指定地图的尺寸。

谷歌地图为Android - 标记没有显示

0 个答案: