经度和纬度 GPSTracker 在 Android 上始终返回 0,0

Question

我正在实现GPS跟踪器，从http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/获取经度和纬度。

为了获取经度和纬度的值，我使用了以下代码：

    gps = new GPSTracker(context);

    latitude_user= gps.getLatitude();
    longitude_user  = gps.getLongitude();

一些设备总是返回0,0值，而对于一些设备，它可以正常工作...那么如何修复呢？

这是GPS Tracker.class文件。

package com.tracking.bus.maps;

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

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) {
        getLatitude();
        getLongitude();
    }

    @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;
    }

}

我已经添加了以下权限。

<uses-permission 
    android:name="android.permission.INTERNET"/>
<uses-permission 
    android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission 
    android:name="android.permission.ACCESS_FINE_LOCATION"/>

- Amay Diam

---

你是怎么让它工作的？你扩展了Service，但你没有默认构造函数。根据你发布的内容，这应该在你实例化时只运行一次，对吗？ - portfoliobuilder

Answer 1

您没有在onLocationChanged()中更新接收到的位置信息，请尝试以下方法：

@Override
public void onLocationChanged(Location location) {
    this.location = location;
    getLatitude();
    getLongitude();
}

- dahec

---

我正在使用相同的代码，但问题是即使启用了 GPS 并且已经设置了通过网络提供程序或 GPS 提供程序查找位置的条件，我仍然无法在房间内接收到位置信息，但当我走出房间时就能够获取位置信息。我该如何解决这个问题？ - Erum

这只是因为你的手机在室内无法获取 GPS 信号。你总是需要到户外去捕捉它。或者你可以通过模拟器来模拟 GPS（例如 Android AVD 或 Genymotion）。后者速度更快。 - dahec

Answer 2

使用Play服务。

compile 'com.google.android.gms:play-services:11.0.4'

更新获取Android中的经纬度的方法

public class MainActivity extends AppCompatActivity implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener,
        ResultCallback<LocationSettingsResult> {

    private static final String TAG = MainActivity.class.getSimpleName();
    private Context context;
    private MarshMallowPermission permission;
    protected static final int REQUEST_CHECK_SETTINGS = 0x1;
    public static final long UPDATE_INTERVAL_IN_MILLISECONDS = 60000;
    public static final long FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS =
            UPDATE_INTERVAL_IN_MILLISECONDS / 2;

    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;
    private LocationSettingsRequest mLocationSettingsRequest;
    protected Boolean mRequestingLocationUpdates;
    protected Location mCurrentLocation;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.yourxml);

        context = this;

        mRequestingLocationUpdates = false;
        permission = new MarshMallowPermission(context);
        buildGoogleApiClient();
        createLocationRequest();
        buildLocationSettingsRequest();

        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                if (permission.checkPermissionForLocation()) {
                    Log.d(TAG, "Permissions Grant");
                    checkLocationSettings();
                } else {
                    permission.requestPermissionForLocation();
                }
            } else {
                checkLocationSettings();
            }

        } catch (Exception e) {

        }

    }



    @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

    @Override
    public void onResume() {
        super.onResume();
        if (mGoogleApiClient.isConnected() && mRequestingLocationUpdates) {
            startLocationUpdates();
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mGoogleApiClient.isConnected()) {
            stopLocationUpdates();
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        mGoogleApiClient.disconnect();
    }

    protected synchronized void buildGoogleApiClient() {
        Log.i(TAG, "Building GoogleApiClient");
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
        mLocationRequest.setFastestInterval(FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }

    protected void buildLocationSettingsRequest() {
        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
        builder.addLocationRequest(mLocationRequest);
        mLocationSettingsRequest = builder.build();
    }

    protected void checkLocationSettings() {
        PendingResult<LocationSettingsResult> result =
                LocationServices.SettingsApi.checkLocationSettings(
                        mGoogleApiClient,
                        mLocationSettingsRequest
                );
        result.setResultCallback(this);
    }

    protected void startLocationUpdates() {
        try {
            LocationServices.FusedLocationApi.requestLocationUpdates(
                    mGoogleApiClient,
                    mLocationRequest,
                    this
            ).setResultCallback(new ResultCallback<Status>() {
                @Override
                public void onResult(Status status) {
                    mRequestingLocationUpdates = true;
                }
            });
        } catch (SecurityException e) {
            Log.i(TAG, e.getMessage());
        }

    }

    protected void stopLocationUpdates() {
        LocationServices.FusedLocationApi.removeLocationUpdates(
                mGoogleApiClient,
                this
        ).setResultCallback(new ResultCallback<Status>() {
            @Override
            public void onResult(Status status) {
                mRequestingLocationUpdates = false;
            }
        });
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            // Check for the integer request code originally supplied to startResolutionForResult().
            case REQUEST_CHECK_SETTINGS:
                switch (resultCode) {
                    case Activity.RESULT_OK:
                        Log.i(TAG, "User agreed to make required location settings changes.");
                        startLocationUpdates();
                    case Activity.RESULT_CANCELED:
                        Log.i(TAG, "User chose not to make required location settings changes.");
                        break;
                }
                break;
        }
    }


    @Override
    public void onConnected(@Nullable Bundle bundle) {
        Log.d(TAG, "Connected");
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.d(TAG, "LocationChanged");
        if (location != null) {
            mCurrentLocation = location;
            Log.d(TAG, "Latitude:  " + location.getLatitude() + "\n" + "Longitude:  " + location.getLongitude());
        }
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }

    @Override
    public void onConnectionSuspended(int i) {

    }




    @Override
    public void onResult(LocationSettingsResult locationSettingsResult) {
        final Status status = locationSettingsResult.getStatus();
        switch (status.getStatusCode()) {
            case LocationSettingsStatusCodes.SUCCESS:
                Log.i(TAG, "All location settings are satisfied.");
                startLocationUpdates();
                break;
            case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                Log.i(TAG, "Location settings are not satisfied. Show the user a dialog to" +
                        "upgrade location settings ");
                try {
                    status.startResolutionForResult(FindPartyActivity.this, REQUEST_CHECK_SETTINGS);
                } catch (IntentSender.SendIntentException e) {
                    Log.i(TAG, "PendingIntent unable to execute request.");
                }
                break;
            case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                Log.i(TAG, "Location settings are inadequate, and cannot be fixed here. Dialog " +
                        "not created.");
                break;
        }
    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        Log.d(TAG, "requestCode---" + requestCode + "     " + "grantResults----" + grantResults);
        switch (requestCode) {
            case MarshMallowPermission.LOCATION_PERMISSION_REQUEST_CODE:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Log.d(TAG, "Permissions Grant");
                    checkLocationSettings();
                } else {
                    //Permissions Deny
                }
        }
    }
}

- Naveen Tamrakar