[英]Android Google Map + Pusher (real time) Listener
我有一個片段,正在使用Google Maps API中的getMapAsync方法,它工作正常。
同時,我想將我的應用程序連接到Pusher,並且在收到的所有事件中,我都希望在地圖上放置一個標記(我希望在用戶連接到該應用程序時實時顯示每個用戶的位置)。
一切都按預期進行,但是我無法訪問Pusher偵聽器(onEvent方法)中的googleMap var。 為什么??
我是Java編程的新手,我認為我做錯了很多,:/
public class HomeFragment extends Fragment implements OnMapReadyCallback,PresenceChannelEventListener{
private me.agiliza.agilizame.models.User _user;
private View _view;
private MapView _map;
private GoogleMap _googleMap;
private Pusher _pusher;
private PresenceChannel _presenceChannel;
private boolean _isSubscribedToPresence;
public HomeFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
_view = inflater.inflate(R.layout.fragment_home, container, false);
_user = UserManager.getInstance(getActivity().getApplicationContext());
_map = (MapView) _view.findViewById(R.id.vMap);
_map.onCreate(savedInstanceState);
_map.onResume(); // needed to get the map to display immediately
MapsInitializer.initialize(getActivity().getApplicationContext());
_map.getMapAsync(this);
return _view;
}
@Override
public void onResume() {
super.onResume();
_map.onResume();
}
@Override
public void onPause() {
super.onPause();
_map.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
_map.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
_map.onLowMemory();
}
@Override
public void onMapReady(GoogleMap googleMap) {
Log.i("Carregou", "Mapa");
_googleMap = googleMap;
_googleMap.setMyLocationEnabled(true);
_googleMap.getUiSettings().setMyLocationButtonEnabled(false);
loadConnectedProviders();
_googleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
@Override
public void onMyLocationChange(Location location) {
if (_isSubscribedToPresence) {
LatLng coordinates = new LatLng(location.getLatitude(), location.getLongitude());
_googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinates, 15));
Log.d(Utils.TAG, "Atualizou localização");
_googleMap.setMyLocationEnabled(false);
_googleMap.addMarker(new MarkerOptions().position(coordinates)).setTitle("Minha localização");
JSONObject jsonObject = new JSONObject();
try {
jsonObject.put("id", _user.getId());
jsonObject.put("latitude", coordinates.latitude);
jsonObject.put("longitude", coordinates.longitude);
} catch (JSONException e) {
e.printStackTrace();
}
_presenceChannel.trigger("client-locup", jsonObject.toString());
}
}
});
}
public void loadConnectedProviders(){
_pusher = PusherManager.getInstance(getActivity());
_pusher.unsubscribe("presence-providers");
_presenceChannel = _pusher.subscribePresence("presence-providers", this, "client-locup");
}
@Override
public void onUsersInformationReceived(String channelName, Set<User> users) {}
@Override
public void userSubscribed(String channelName, User user) {
}
@Override
public void userUnsubscribed(String channelName, User user) {}
@Override
public void onAuthenticationFailure(String message, Exception e) {
_isSubscribedToPresence = false;
}
@Override
public void onSubscriptionSucceeded(String channelName) {
_isSubscribedToPresence = true;
}
@Override
public void onEvent(String channelName, String eventName, String data) {
try {
JSONObject jsonObject = new JSONObject(data);
int userId = jsonObject.getInt("id");
LatLng latLng = new LatLng(jsonObject.getDouble("latitude"),jsonObject.getDouble("longitude"));
// I cant get this to work
//_googleMap.addMarker(new MarkerOptions().position(latLng));
Log.d(Utils.TAG, "Id is " + userId + " Value of lat is " + latLng.latitude + " and long is " + latLng.longitude);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
您必須獲取NullPointerException,因為_googleMap
無法准備好。 嘗試這樣的事情。
private final Stack<JSONObject> mPending = new Stack<>();
@Override
public void onMapReady(GoogleMap googleMap) {
Log.i("Carregou", "Mapa");
_googleMap = googleMap;
syncMarkers(); // <=== LOOK HERE
_googleMap.setMyLocationEnabled(true);
_googleMap.getUiSettings().setMyLocationButtonEnabled(false);
loadConnectedProviders();
_googleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
@Override
public void onMyLocationChange(Location location) {
if (_isSubscribedToPresence) {
LatLng coordinates = new LatLng(location.getLatitude(), location.getLongitude());
_googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinates, 15));
Log.d(Utils.TAG, "Atualizou localização");
_googleMap.setMyLocationEnabled(false);
_googleMap.addMarker(new MarkerOptions().position(coordinates)).setTitle("Minha localização");
JSONObject jsonObject = new JSONObject();
try {
jsonObject.put("id", _user.getId());
jsonObject.put("latitude", coordinates.latitude);
jsonObject.put("longitude", coordinates.longitude);
} catch (JSONException e) {
e.printStackTrace();
}
_presenceChannel.trigger("client-locup", jsonObject.toString());
}
}
});
}
@Override
public void onEvent(String channelName, String eventName, String data) {
try {
JSONObject jsonObject = new JSONObject(data);
mPending.add(jsonObject);
syncMarkers(); // <=== LOOK HERE
Log.d(Utils.TAG, "Id is " + userId + " Value of lat is " + latLng.latitude + " and long is " + latLng.longitude);
} catch (JSONException e) {
e.printStackTrace();
}
}
private void syncMarkers() {
if (_googleMap != null) {
runOnUiThread(new Runnable() {
@Override
public void run() {
while (!mPending.empty()) {
JSONObject jsonObject = mPending.pop();
int userId = jsonObject.getInt("id");
LatLng latLng = new LatLng(jsonObject.getDouble("latitude"), jsonObject.getDouble("longitude"));
_googleMap.addMarker(new MarkerOptions().position(latLng));
}
}
});
}
}
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