使用定位服务更新 google 地图

Question

我有一个 LocationService，它在后台获取用户位置并向 activity 发送带有纬度和经度的广播。这是在这个问题的已接受答案中找到的代码 Background service with location listener in android

我使用 Android Studio 提供的 Google 地图 Activity 创建了项目。在地图中Activity 我得到这样的广播额外内容

public class newMessage extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equalsIgnoreCase(LocationService.BROADCAST_ACTION)) {
                Bundle extra = intent.getExtras();
                latitude = extra.getDouble("Latitude");
                longitude = extra.getDouble("Longitude");

                System.out.println("Latitude: "+latitude);
                System.out.println("Longitude: "+longitude);

                LatLng newLocation = new LatLng(latitude,longitude);
            }
        }
    }

我现在想用新位置更新地图，但我不知道该怎么做。我当前的设置是否可行？

Answer 1

您需要创建一个 locationService，您可以在其中获取当前位置。检查这个例子：

public class LocationService extends Service implements
        LocationListener,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {

    private static final String TAG = LocationService.class.getSimpleName();
    protected GoogleApiClient mGoogleApiClient;
    protected LocationRequest mLocationRequest;
    protected Location mCurrentLocation;

    @Override
    public void onCreate() {

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        buildGoogleApiClient();
        mGoogleApiClient.connect();
        return START_NOT_STICKY;
    }

    @Override
    public void onConnected(Bundle bundle) {
        Log.i("fixedrec", TAG + ">Connected to GoogleApiClient");
        if (mCurrentLocation == null) {
            mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
            mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
        }
        startLocationUpdates();
    }

    @Override
    public void onConnectionSuspended(int i) {

    }


    @Override
    public void onDestroy() {
        super.onDestroy();
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        mGoogleApiClient.disconnect();
        Log.d("fixedrec", TAG+ ">StoppingService");
        mNM.cancel(NOTIFICATION);
        stopForeground(true);
    }

    @Override
    public void onLocationChanged(Location location) {
       //plase where you get your locations
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.d("fixedrec", TAG + "> Connection failed: ConnectionResult.getErrorCode() = "
                + connectionResult.getErrorCode());
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    protected void startLocationUpdates() {
        LocationServices.FusedLocationApi.requestLocationUpdates(
                mGoogleApiClient, mLocationRequest, this);
        Log.i("fixedrec", TAG + "> StartLocationUpdates");
    }


    protected synchronized void buildGoogleApiClient() {
        Log.i("fixedrec", TAG + "> Building GoogleApiClient");
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(10000);
        mLocationRequest.setFastestInterval(5000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }
}

要在应用程序中广播您的位置，您可以使用 BroadCastReceiver 或像 Otto 这样的 EventBus。然后只需创建一个 googleMap 并向其添加一个带有获取位置的标记。

如果您正在处理 SDK >=23

，请不要忘记在您的清单文件和代码中写入 locationPermissions

你也可以研究这个项目。 Fixedrec3

这里应有尽有。

Answer 2

在activity中声明广播接收器并显示当前位置的标记

public BroadcastReceiver locationUpdateReceiver = new  BroadcastReceiver(){
        @Override
        public void onReceive(Context context, Intent intent) {
            //show current location marker
mMap.addMarker(new MarkerOptions().position(/*your lat long*/).title("My Location")));
        }
    };

使用定位服务更新 google 地图

Update google map using location service

android

google-maps

android-location