我使用以下代码获取当前位置。但我面临的问题是，在Gps的情况下，它的纬度和经度总是返回0.0。网络提供商正常工作。 。我已打开手机中的GPS设置并设置所有权限。但我仍然面临这一点。
* / Java代码 / *
public class GpsLocationTracker extends Service implements LocationListener
{
private Context mContext;
private boolean isGpsEnabled = false;
private boolean isNetworkEnabled = false;
private boolean canGetLocation = false;
private Location mLocation;
private double mLatitude;
private double mLongitude;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATE = 10;
private static final long MIN_TIME_FOR_UPDATE = 60000;
private LocationManager mLocationManager;
/**
* mContext constructor of the class
*/
public GpsLocationTracker(Context mContext)
{
this.mContext = mContext;
getLocation();
}
/**
* method to finding the location
*/
public Location getLocation()
{
try {
mLocationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);
/*getting status of the gps*/
isGpsEnabled = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
/*getting status of network provider*/
isNetworkEnabled = mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGpsEnabled && !isNetworkEnabled)
{
/*no location provider enabled*/
System.out.println("Gps and Network not enabled");
}
else
{
this.canGetLocation = true;
/*getting location from network provider*/
/* if (isNetworkEnabled) {
mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_FOR_UPDATE, MIN_DISTANCE_CHANGE_FOR_UPDATE, this);
if (mLocationManager != null) {
mLocation = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (mLocation != null) {
mLatitude = mLocation.getLatitude();
mLongitude = mLocation.getLongitude();
}
}
}*/
/*if gps is enabled then get location using gps*/
if (isGpsEnabled)
{
if (mLocation == null)
{
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_FOR_UPDATE, MIN_DISTANCE_CHANGE_FOR_UPDATE, this);
if (mLocationManager != null)
{
mLocation = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
System.out.println("location gps"+mLocation);
if (mLocation != null)
{
mLatitude = mLocation.getLatitude();
mLongitude = mLocation.getLongitude();
System.out.println("Latitude gps"+mLatitude);
System.out.println("longitude gps"+mLongitude);
}
}
}
}
// }
}
} catch (Exception e) {
e.printStackTrace();
}
return mLocation;
}
/**
* call this function to stop using gps in our application
*/
public void stopUsingGps()
{
if (mLocationManager != null)
{
mLocationManager.removeUpdates(GpsLocationTracker.this);
}
}
/**
* @return latitude <p/> function to get latitude
*/
public double getLatitude()
{
if (mLocation != null)
{
mLatitude = mLocation.getLatitude();
}
return mLatitude;
}
/**
* @return longitude function to get longitude
*/
public double getLongitude()
{
if (mLocation != null)
{
mLongitude = mLocation.getLongitude();
}
return mLongitude;
}
/**
* @return to check gps or wifi is enabled or not
*/
public boolean canGetLocation()
{
return this.canGetLocation;
}
/**
* function to prompt user to open settings to enable gps
*/
public void showSettingsAlert()
{
AlertDialog.Builder mAlertDialog = new AlertDialog.Builder(new ContextThemeWrapper(mContext, R.style.AppTheme));
mAlertDialog.setTitle("Gps Disabled");
mAlertDialog.setMessage("gps is not enabled . do you want to enable ?");
mAlertDialog.setPositiveButton("settings", new OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
// TODO Auto-generated method stub
Intent mIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(mIntent);
}
});
mAlertDialog.setNegativeButton("cancle", new OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
// TODO Auto-generated method stub
dialog.cancel();
}
});
final AlertDialog mcreateDialog = mAlertDialog.create();
mcreateDialog.show();
}
@Override
public IBinder onBind(Intent arg0)
{
// TODO Auto-generated method stub
return null;
}
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
答案 0 :(得分：0)
您可以使用此课程。
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;
boolean canGetLocation = false;
Location location;
public static double latitude;
public static double longitude;
// The minimum distance to change updates in metters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10
// metters
// The minimum time beetwen 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.getApplicationContext();
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.NETWORK_PROVIDER);
updateGPSCoordinates();
}
}
// 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);
updateGPSCoordinates();
}
}
}
}
} catch (Exception e) {
Log.e("Error : Location",
"Impossible to connect to LocationManager", e);
}
return location;
}
public void updateGPSCoordinates() {
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
/**
* 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;
}
/**
* Function to get longitude
*/
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
return longitude;
}
/**
* Function to check GPS/wifi enabled
*/
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
*/
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
// alertDialog.setTitle(R.string.GPSAlertDialogTitle);
// Setting Dialog Message
alertDialog.setMessage("Hello");
// On Pressing Setting button
alertDialog.setPositiveButton("kkkk",
new DialogInterface.OnClickListener() {
@Override
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() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.show();
}
/**
* Get list of address by latitude and longitude
*
* @return null or List<Address>
*/
public List<Address> getGeocoderAddress(Context context) {
if (location != null) {
Geocoder geocoder = new Geocoder(context, Locale.ENGLISH);
try {
List<Address> addresses = geocoder.getFromLocation(latitude,
longitude, 1);
return addresses;
} catch (IOException e) {
// e.printStackTrace();
Log.e("Error : Geocoder", "Impossible to connect to Geocoder",
e);
}
}
return null;
}
/**
* Try to get AddressLine
*
* @return null or addressLine
*/
public String getAddressLine(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
String addressLine = address.getAddressLine(0);
return addressLine;
} else {
return null;
}
}
/**
* Try to get Locality
*
* @return null or locality
*/
public String getLocality(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
String locality = address.getLocality();
return locality;
} else {
return null;
}
}
/**
* Try to get Postal Code
*
* @return null or postalCode
*/
public String getPostalCode(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
String postalCode = address.getPostalCode();
return postalCode;
} else {
return null;
}
}
/**
* Try to get CountryName
*
* @return null or postalCode
*/
public String getCountryName(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
String countryName = address.getCountryName();
return countryName;
} else {
return null;
}
}
@Override
public void onLocationChanged(Location location) {
this.location = location;
getLatitude();
getLongitude();
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
答案 1 :(得分：0)
按照此Link获取设备中GPS的获取当前位置。 当用户关闭GPS时，会在设备中启用GPS显示警告对话框。