Android 安装应用时的 getLocation 是 0.0

Question

我正在真实设备上测试我的应用程序，出现错误并且不知道如何修复。

我的应用程序在安装应用程序时请求允许访问 android 上的位置。第一次定位需要点击定位按钮。

我的问题是：如果 GPS 被禁用，应用程序找不到正确的位置，即使在激活后，经度和纬度仍为 0.0。

当你点击按钮时，应用程序会检查它是否已激活并要求激活，但即使激活位置与 0.0 相同

如果您在启用 GPS 的情况下安装应用程序，则不会出现此问题。

有人可以帮助我吗？

我正在使用此代码定位按钮

 public void btnlocalizacao(View view) {
       gps = new GPSTracker(MainActivity.this);

    // check if GPS enabled
                if (gps.canGetLocation()) {
                    double latitude = gps.getLatitude();
                    double longitude = gps.getLongitude();
                    CameraPosition newCamPos = new CameraPosition(new LatLng(latitude, longitude),
                            15.5f,
                            googleMap.getCameraPosition().tilt, //use old tilt
                            googleMap.getCameraPosition().bearing); //use old bearing
                    googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(newCamPos), 2000, null);

                } else {
                    gps.showSettingsAlert();
                }
}

这是 gps class

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 = 1; // 10 meters

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

    // Declaring a Location Manager
    protected LocationManager locationManager;
    Criteria criteria = new Criteria();

    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;
                // First get location from Network Provider
                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.getBestProvider(criteria, true));
                        //location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                            Log.d("Localização", latitude + " " + longitude);
                        }
                    }
                }
                // 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.getBestProvider(criteria, false));
                            //location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                                Log.d("Localização", latitude + " " + longitude);
                            }
                        }
                    }
                }
            }

        } 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("ALerta de GPS");

        // Setting Dialog Message
        alertDialog.setMessage("GPS não esta ativado, gostaria de ativar?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Configurações", 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("Cancelar", 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;
    }

}

Answer 1

My problem is this: If GPS is disabled, the app does not find the right position, even after activation, getting as latitude and longitude 0.0.

一切正常。您被授予位置权限的事实意味着您被允许获得位置 IF，并且只有 IF 它可用。仅此而已，尤其是它 NOT 保证甚至意味着您将永远不会从系统中获得任何坐标（用户可能即不使用 GPS 接收器）。

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