GpsTracker：GoogleApiClient Wifi 和移动数据获取纬度和经度不起作用？

Question

我正在开发 GpsTracker 应用程序，目前正在使用 gps 获取 lat,lng 值，一旦我关闭 gps，我无法获得任何 lat,lng 值，但我的要求是移动数据或 wifi 或 gps，具体取决于我需要的可用性为了获得 lat，lng 值，我非常了解使用位置管理器，但与 googleapi 客户端相比，它消耗更多电池，所以我使用了 googleapi 客户端 - fusedlocationproviderapi 请指导我为什么它在当前 api 中无法使用此功能。

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

    private GoogleApiClient mLocationClient;

    private Location mCurrentLocation;
    LocationRequest mLocationRequest;
    private static final String TAG = "UpdateLocationService";
    private static final long INTERVAL = 1000 * 10;
    private static final long FASTEST_INTERVAL = 1000 * 5;
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO do something useful
        Toast.makeText(this, "onStartCommand", Toast.LENGTH_SHORT).show();
        createLocationRequest();
        mLocationClient = new GoogleApiClient.Builder(UpdateLocation.this)
                .addApi(LocationServices.API).addConnectionCallbacks(UpdateLocation.this)
                .addOnConnectionFailedListener(UpdateLocation.this).build();
        mLocationClient.connect();

        return Service.START_STICKY;
    }
    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(INTERVAL);
        mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
    }
    @Override
    public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub
        mCurrentLocation = location;
        Toast.makeText(this, mCurrentLocation.getLatitude() +", "+ mCurrentLocation.getLatitude(), Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onConnectionFailed(ConnectionResult arg0) {
        // TODO Auto-generated method stub
        Toast.makeText(this, "Connection failed", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onConnected(Bundle arg0) {
        // TODO Auto-generated method stub
        Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();

        if (mLocationClient.isConnected()) {
            PendingResult<Status> pendingResult = LocationServices.FusedLocationApi.requestLocationUpdates(
                    mLocationClient, mLocationRequest, this);
        }

    }

    @Override
    public void onConnectionSuspended(int arg0) {
        // TODO Auto-generated method stub
        Toast.makeText(this, "Disconnected. Please re-connect.",
                Toast.LENGTH_SHORT).show();
    }


    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onDestroy() {
        if (mLocationClient.isConnected()) {
            LocationServices.FusedLocationApi.removeLocationUpdates(
                    mLocationClient, this);
        }
        mLocationClient.disconnect();
    }

}

Answer 1

这是我使用的 GPSTracker 的实现：

public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }       
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}

添加后，使用getLocation() 方法获取位置。

您还可以添加检查您的连接是如何建立的数据或 Wifi 的部分：

public static boolean isConnected(Context context){
        NetworkInfo localNetworkInfo = ((ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();
        if (localNetworkInfo == null) {
            return false;
        }
        else{
            //Check if only wifi is selected or wifi==1  Constant Value: 1 (0x00000001)
            if(((localNetworkInfo.getType() == 1)) || (localNetworkInfo.isConnected()) || (localNetworkInfo.isAvailable()))
                return true;
        }
        return false;
    }