Question

我有一个LocationService，它在后台获取用户位置，并向具有纬度和经度的活动发送广播。这是在此问题Background service with location listener in android

的已接受答案中找到的代码

我使用Android Studio提供的Google Maps Activity创建了该项目。在MapsActivity中，我得到了像这样的广播附加内容

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，但我不知道如何做到这一点。我目前的设置是否可行？

Answer 1

您需要创建一个locationService，您可以在其中获取当前位置。检查此示例：

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Eventto，如Otto。然后只需创建一个googleMap并添加一个带有获取位置的标记。

如果您正在处理SDK＆gt; = 23

，请不要忘记您在清单文件和代码内写入locationPermissions

你也可以学习这个项目。 Fixedrec3

你需要的一切都在那里。

Answer 2

在活动中声明广播接收器并将标记显示到当前位置

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")));
        }
    };

使用位置服务

2 个答案: