我试图获取当前的用户位置，但在某些设备上它可以正常工作，但有些人在等待该位置。
这是我的代码：
private final LocationListener mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(final Location location) {
// TODO
Log.v("--", "get address 121");
Main.this.location = location;
getAddress();
locationManager.removeUpdates(mLocationListener);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
Log.v("--", "provider enabled");
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
Log.v("--", "provider disabled");
}
};
public void putExtra() {
Intent intent = new Intent(this, Settings.class);
intent.putExtra("timesobj", times);
startActivity(intent);
}
/**
* Get current/last known location and display city, country name and update
* calculations
* */
public void getAddress() {
Log.v("--", "get address 1");
boolean isGPSProviderEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean network_enabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
Log.v("--", "get address 31 " + isGPSProviderEnabled + " gps - "
+ isConnectedToNetwork());
if (isGPSProviderEnabled || network_enabled) {
Log.v("--", "get address 2");
Criteria c = new Criteria();
Log.v("--", "provider " + locationManager.getBestProvider(c, true));
location = locationManager.getLastKnownLocation(locationManager
.getBestProvider(c, false));
if (location == null) {
Log.v("--", "get address 6");
locationManager.requestLocationUpdates(
locationManager.getBestProvider(c, false), 1000, 100,
mLocationListener);
} else {
Log.v("--", "get address 3");
if (isConnectedToNetwork()) {
new AsyncTask<Void, Void, Void>() {
protected Void doInBackground(Void... params) {
try {
com.myapp.utils.Geocoder geocoder = new com.myapp.utils.Geocoder(
Main.this);
GeocoderModel geocoderModel = geocoder
.getFromLocation(
location.getLatitude(),
location.getLongitude(), 5);
city = geocoderModel.getCity();
country = geocoderModel.getCountry();
prefs.edit().putString(Constants.CITY, city)
.apply();
Log.v("--", "get address 4");
} catch (IOException e) {
Log.v("--", "get address 11");
e.printStackTrace();
} catch (LimitExceededException e) {
Log.v("--", "get address 12");
e.printStackTrace();
}
return null;
};
protected void onPostExecute(Void result) {
prefs.edit().putString(Constants.COUNTRY, country)
.apply();
prefs.edit().putString(Constants.CITY, city)
.apply();
populateList(location);
};
}.execute();
} else {
city = prefs.getString(Constants.CITY,
getString(R.string.app_name));
Log.v("--", "get address 33 " + location.getLatitude());
populateList(location);
}
}
} else {
Log.v("--", "get address 5");
startGpsEnableDialog();
}
}
这是我的日志：
V/-- ( 5498): get address 1
V/-- ( 5498): get address 31 true gps - true
V/-- ( 5498): get address 2
V/-- ( 5498): provider gp
V/-- ( 5498): get address 6
有人可以帮助我解决此代码中的错误，并告诉我如何才能正确获取用户位置？
谢谢！
答案 0 :(得分：1)
尝试更改行
locationManager.getBestProvider(c, false)
到
locationManager.getBestProvider(c, true)
如上所述here，“enabledOnly - 如果为true，则仅返回当前启用的提供程序”。您可能会返回未启用的提供程序。
还有一件事，你似乎在使用Criteria，我通常不会使用它，但是通过查看你的代码看起来你似乎没有用它做多少。我建议你再看看它。我找到了一个可能对您有帮助的代码示例here。
private void startLocationStuff(){
locManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
locListener=new MyLocationListener();
final Criteria criteria=new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
bestProvider=locManager.getBestProvider(criteria,true);
}
您可能需要考虑使用不带条件的位置管理器，例如this。
答案 1 :(得分：1)
答案是添加以下代码：
locationManager.requestSingleUpdate(locationManager.getBestProvider(c, true), mLocationListener, Looper.myLooper());
答案 2 :(得分：0)
试试这个
GPSTrAcker.java
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;
// 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);
// Setting Dialog Title
alertDialog.setTitle("GPS Settings");
// Setting Dialog Message
alertDialog
.setMessage("GPS is not enabled. You want to go to the 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;
}
}
在MainActivity.java调用方法
中public void getCurrentLatLng() {
GPSTracker gps = new GPSTracker(SignInActivity.this);
// check if GPS enabled
if (gps.isGPSEnabled) {
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
LatLng currentLatLng = new LatLng(latitude, longitude);
System.out.println(currentLatLng);
} else {
gps.showSettingsAlert();
}
}
答案 3 :(得分：0)
我认为你的代码也不是那么好和主要。有没有更好的方法。
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.support.v7.app.AlertDialog;
import android.util.Log;
/**
* Created by moodless3 2017
*/
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 = 1000; // 1000 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 2; // 2 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 latitude/longitude 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/Wi-Fi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog.
* On pressing the Settings button it will launch 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 the 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 the 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;
}
}