我的片段中有这个方法：
public void putMarkers(ArrayList<Parking> parking){
if(parkingList.size()>0){
for(int i=0; i< parkingList.size(); i++){
Parking thisParking = parkingList.get(i);
final LatLng ll = new LatLng(thisParking.getLatitude(), thisParking.getLongitude());
if (mMap !=null){
mMap.addMarker(new MarkerOptions().position(ll).title("ll"));
}
}
}
}
My Arraylist已填充，mMap不为null我在调试器中看到调用了addMarker Line，但是标记没有显示在地图上，下一步应该搜索错误。
如果需要完整的代码来回答：
public class HomeMapFrag extends Fragment implements getDataFromAsync{
private SupportMapFragment mapFragment;
ConnectDB db;
Context myContext = null;
LocationManager mLocationManager;
MapView mapView ;
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
private LatLng center;
TextView markerText;
Parking[] parkings = null;
ArrayList<Parking> parkingList = new ArrayList<Parking>();
public HomeMapFrag(){
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.home_map, container, false);
markerText = (TextView) rootView.findViewById(R.id.locationMarkertext);
//mMap.clear();
myContext = getActivity();
markerText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
center = mMap.getCameraPosition().target;
PopupMenu popup = new PopupMenu(getActivity(), v);
popup.getMenuInflater().inflate(R.menu.pop_up, popup.getMenu());
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.park_me:
mMap.clear();
mMap.addMarker(new MarkerOptions().position(center).title("Parked"));
Toast.makeText(getActivity(), "Park me", Toast.LENGTH_SHORT).show();
return true;
case R.id.search_parking:
//This is the option i click :===================================
getMessageFromSFpark(center.latitude, center.longitude);
return true;
case R.id.mark_fav:
Toast.makeText(getActivity(), "Mark Fav", Toast.LENGTH_SHORT).show();
return true;
default:
return false;
}
}
});
// Handle dismissal with: popup.setOnDismissListener(...);
// Show the menu
popup.show();
}
});
return rootView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
// TODO Auto-generated method stub
setUpMapIfNeeded();
}
@Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
FragmentManager myFM = getChildFragmentManager();
mapFragment = (SupportMapFragment)myFM.findFragmentById(R.id.map);
mMap = mapFragment.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
LatLng myCurrentLocation;
mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
mMap.getUiSettings(). setZoomControlsEnabled(true);
mMap.getUiSettings(). setAllGesturesEnabled(true);
mMap.setMyLocationEnabled(true);
Location myLocation = getLastKnownLocation();
if(myLocation!= null){
myCurrentLocation = new LatLng(myLocation.getLatitude(), myLocation.getLongitude());
mMap.addMarker(new MarkerOptions().position(myCurrentLocation).title("You are here!"));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(myCurrentLocation, 13));
}else{
Toast.makeText(getActivity(), "cant get loc, GPS may be OFF !!", Toast.LENGTH_LONG).show();
}
}
private Location getLastKnownLocation() {
mLocationManager = (LocationManager)getActivity().getSystemService(myContext.LOCATION_SERVICE);
List<String> providers = mLocationManager.getProviders(true);
Location bestLocation = null;
for (String provider : providers) {
Location l = mLocationManager.getLastKnownLocation(provider);
if (l == null) {
continue;
}
if (bestLocation == null || l.getAccuracy() < bestLocation.getAccuracy()) {
bestLocation = l;
}
}
return bestLocation;
}
private void getMessageFromSFpark(double lat, double lon){
String myurl = "http://api.sfpark.org/sfpark/rest/availabilityservice?lat="
+lat
+"&long="
+lon
+"&radius=0.25&uom=mile&response=json";
GetParking gp = new GetParking(myContext, this);
gp.execute(myurl);
}
public void showListDialogue(){
final Dialog dialog = new Dialog(myContext);
View view = getActivity().getLayoutInflater().inflate(R.layout.dialogue_list, null);
ListView lv = (ListView) view.findViewById(R.id.parking_list);
DialogueListAdapter myPark = new DialogueListAdapter(myContext, parkingList);
// on click listener here:
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// show action items
Parking newOne = (Parking)parent.getAdapter().getItem(position);
// now add parking to database.
addParkingtoDB(newOne);
Toast.makeText(myContext, "added to db", Toast.LENGTH_LONG).show();
dialog.dismiss();
}
});
lv.setAdapter(myPark);
dialog.setTitle("Parking Nearby :");
dialog.setContentView(view);
dialog.show();
}
public void addParkingtoDB(Parking parking){
db = new ConnectDB(myContext);
db.addParking(parking);
}
public String checkParkingDB(){
db = new ConnectDB(myContext);
ArrayList<Parking> parkList = db.getParkingList();
Parking parkFav = parkList.get(parkList.size() - 1);
String s = "FROM DB :Total items="
+ parkList.size()
+ "\nLast Address = "
+ parkFav.getAddress();
return s;
}
public void showMsg(String msg){
Toast.makeText(myContext, msg, Toast.LENGTH_LONG).show();
}
@Override
public void onTaskCompleted(JSONObject jobj) {
// method of the interface getDataFromAsync
try {
parkings = JSONParseSF.parseJsonFromSF(jobj);
} catch (JSONException e) {
Log.e("Error", "Exception from JSONParseSF.parseJsonFromSF ");
e.printStackTrace();
}
if(parkings != null){
parkingList = new ArrayList<Parking>(Arrays.asList(parkings));// for listview
//String address = parkings[0].getAddress();
//Toast.makeText(myContext, address, Toast.LENGTH_LONG).show();
if(parkingList.size()>0){
//showListDialogue();
putMarkers(parkingList);
//TODO check this code
}else{
Toast.makeText(myContext, "SORRY !! NO PARKING DATA !", Toast.LENGTH_LONG).show();
}
}
}
public void putMarkers(ArrayList<Parking> parking){
if(parkingList.size()>0){
for(int i=0; i< parkingList.size(); i++){
Parking thisParking = parkingList.get(i);
final LatLng ll = new LatLng(thisParking.getLatitude(), thisParking.getLongitude());
if (mMap !=null){
mMap.addMarker(new MarkerOptions().position(ll).title("ll"));
}
}
}
}
}