Android GPS 跟踪错误的位置
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【中文标题】Android GPS 跟踪错误的位置【英文标题】：Android GPS tracks wrong location 【发布时间】：2016-07-01 20:48:21 【问题描述】：在我的应用程序中，我想显示用户的当前位置，如果位置发生更改，它将显示更改位置的警报消息。问题是即使手机的 GPS 关闭，它也会显示位置更改消息。可能是什么原因？
这是我的代码：
protected void onResume()
/**
* get saved Location from shared preference
*
*/
SharedPreferences sPrefs = PreferenceManager
.getDefaultSharedPreferences(Activity_Home.this);
String getL = sPrefs.getString(Utility.KEY_USER_LAT, "0.000000");
String getLo = sPrefs.getString(Utility.KEY_USER_LONG, "0.000000");
getLat = Double.parseDouble(getL);
getLog = Double.parseDouble(getLo);
gps = new GpsTracker(Activity_Home.this);
/**
* Get user current latitude and longitude and match them to stored
* latitude and longitude if distance between these latitude then Pop up
* will be show
*
* @author Ankit
*/
if (gps.canGetLocation())
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
System.out.println("Latitude is " + getLat);
if (getLat > 0.0)
Location locationA = new Location("point A");
locationA.setLatitude(getLat);
locationA.setLongitude(getLog);
Location locationB = new Location("point B");
locationB.setLatitude(latitude);
locationB.setLongitude(longitude);
distance = locationA.distanceTo(locationB);
// Toast.makeText(Activity_Home.this,
// "Distance is :"+Double.toString(distance),
// Toast.LENGTH_LONG).show();
distance = distance / 1000000;
int getDistance = (int) (distance * 1000000);
System.out.println("Distance is " + getDistance);
if (getDistance > 100)
showWarningMessage();
String lat = String.valueOf(latitude);
String lon = String.valueOf(longitude);
SharedPreferences sPref = PreferenceManager
.getDefaultSharedPreferences(Activity_Home.this);
SharedPreferences.Editor sEdit = sPref.edit();
sEdit.putString(Utility.KEY_USER_LAT, lat);
sEdit.putString(Utility.KEY_USER_LONG, lon);
sEdit.commit();
else
gps.showSettingsAlert();
super.onResume();
// Method for show an Alert dialog for user if user's location changed''
public void showWarningMessage()
AlertDialog.Builder alertDialog = new AlertDialog.Builder(
Activity_Home.this);
alertDialog.setCancelable(false);
// Setting Dialog Title
alertDialog.setTitle("Location Changed");
// Setting Dialog Message
alertDialog
.setMessage("It seems your location has changed, would you like to change the Branch now?");
// On pressing Settings button
alertDialog.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
Intent intent = new Intent(Activity_Home.this,
Activity_Settings.class);
startActivity(intent);
dialog.cancel();
);
// on pressing cancel button
alertDialog.setNegativeButton("No",
new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
dialog.cancel();
);
// Showing Alert Message
alertDialog.show();
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 = 100; // 100 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);
System.out.println("=====isGPSEnabled:
"+isGPSEnabled+"====isNetworkEnabled: "+isNetworkEnabled);
if (!isGPSEnabled && !isNetworkEnabled)
// no network provider is enabled
System.out.println("=====notgps");
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.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);
alertDialog.setCancelable(false);
// Setting Dialog Title
alertDialog.setTitle("Enable GPS");
// 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();
// alertDialog.;
@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;
【问题讨论】：
呃，不是 GPSTracker.... 不要使用此代码.... 请参阅此处：gabesechansoftware.com/location-tracking 如果您想在更改位置时使用onLocationChanged(Location location)
locationA.setLatitude(getLat);, locationA.setLongitude(getLog); GPS关闭时，这两条线会获取当前位置吗？或者它只会返回 0？
@HariKrishnan locationA.setLatitude(getLat);, locationA.setLongitude(getLog);将返回保存在共享首选项中的最后一个位置
我有同样的问题。Gps 跟踪器显示我错了 lat long 。我也在尝试修复这个错误。
【参考方案1】：
这是一个查找位置的示例代码，检查它是否适合您
公共静态无效 LocationFind()
try
if (Skyhook)
_xps.getXPSLocation(null,
// note we convert _period to seconds
(int) (_period / 1000), _desiredXpsAccuracy, _callback);
// _xps.getLocation(null, _streetAddressLookup, _callback);
else
Criteria criteria = new Criteria();
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
criteria.setAltitudeRequired(false);
criteria.setAccuracy(Criteria.ACCURACY_FINE);
LocationManager locationManager = (LocationManager) mcontext.getSystemService(Context.LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// Getting network status
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (isNetworkEnabled)
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, locationListener);
// Log.d("Network", "Network");
if (locationManager != null)
lastknownlocations = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (lastknownlocations != null)
lat = lastknownlocations.getLatitude();
lng = lastknownlocations.getLongitude();
if (isGPSEnabled)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, locationListener);
// Log.d("Network", "Network");
if (locationManager != null)
lastknownlocations = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (lastknownlocations != null)
lat = lastknownlocations.getLatitude();
lng = lastknownlocations.getLongitude();
if (lat == 0.0 && lng == 0.0)
lng = lastknownlocations.getLongitude();
lat = lastknownlocations.getLatitude();
getAddressFromLatLong(lat, lng);
catch (Exception e)
e.printStackTrace();
【讨论】：
【参考方案2】：试试这个服务类。每当10 meters 与最后一个位置不同时，这就会向方法sendLocationDataToProcess(Location location) 发送更新
public class AppLocationService extends Service implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener
private LocationRequest locationRequest;
private GoogleApiClient googleApiClient;
private Context appContext;
private boolean currentlyProcessingLocation = false;
private int mInterval=0;
private final int CONNTIMEOUT=50000;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
@Override
public int onStartCommand(Intent intent, int flags, int startId)
appContext=getApplicationContext();
Toast.makeText(getBaseContext(), "Location Service Started", Toast.LENGTH_SHORT)
.show();
if (!currentlyProcessingLocation)
currentlyProcessingLocation = true;
startTracking();
return START_STICKY;
private void startTracking()
if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(this) == ConnectionResult.SUCCESS)
Log.v(Constants.BLL_LOG, "ConnectionResult SUCCESS");
googleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
if (!googleApiClient.isConnected() || !googleApiClient.isConnecting())
googleApiClient.connect();
else
Log.v(Constants.BLL_LOG, "NOT connected googleApiClient.connect()");
else
Log.v(Constants.BLL_LOG, "unable to connect to google play services.");
@Override
public IBinder onBind(Intent intent)
return null;
public AppLocationService()
@Override
public void onConnected(Bundle bundle)
Log.v(Constants.BLL_LOG,"onConnected");
locationRequest = LocationRequest.create();
locationRequest.setInterval(mInterval * 1000); // milliseconds
locationRequest.setFastestInterval(mInterval * 1000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setSmallestDisplacement(MIN_DISTANCE_CHANGE_FOR_UPDATES);//dostance change
int permissionCheck = ContextCompat.checkSelfPermission(appContext, Manifest.permission.ACCESS_COARSE_LOCATION);
if (permissionCheck!= PackageManager.PERMISSION_DENIED)
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
@Override
public void onConnectionSuspended(int i)
Log.v(Constants.BLL_LOG,"onConnectionSuspended");
@Override
public void onLocationChanged(Location location)
Log.v(Constants.BLL_LOG, "onLocationChanged position: " + location.getLatitude() + ", " + location.getLongitude() + " accuracy: " + location.getAccuracy());
Log.v(Constants.BLL_LOG, "onLocationChanged position: location.getAccuracy()= "+location.getAccuracy());
sendLocationDataToProcess(location);
@Override
public void onConnectionFailed(ConnectionResult connectionResult)
Log.v(Constants.BLL_LOG,"onConnectionFailed");
void sendLocationDataToProcess(Location location)
//Do your logic with Location data
@Override
public void onDestroy()
super.onDestroy();
if (googleApiClient != null && googleApiClient.isConnected())
googleApiClient.disconnect();
【讨论】：
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