我正在尝试使用GPS或Network Provider获取当前位置。我的设备GPS已启用，但我未收到Latitude和Longitude。
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;
boolean canGetLocation = false;
Location location;
public double latitude;
public 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 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 Network Provider Enabled get lat/long using GPS Services
if (isNetworkEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
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);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
} catch (Exception e) {
// e.printStackTrace();
Log.e("Error : Location",
"Impossible to connect to LocationManager", e);
}
return location;
}
public void updateGPSCoordinates() {
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
return latitude;
}
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
return longitude;
}
}
Service.Java
public class WifiScaningService extends IntentService {
GpsTracker gpsTracker;
double latitude;
double longitude;
public WifiScaningService() {
super("WifiScaningService");
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public void onCreate() {
Log.e("service call","service call");
}
@Override
protected void onHandleIntent(Intent intent) {
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("LocalService", "Received start id " + startId + ": " + intent);
gpsTracker = new GpsTracker(this);
String stringLatitude = String.valueOf(gpsTracker.latitude);
latitude = Double.parseDouble(stringLatitude);
Log.e("Latitude",stringLatitude);
String stringLongitude = String.valueOf(gpsTracker.longitude);
longitude = Double.parseDouble(stringLongitude);
Log.e("Longitude",stringLongitude);
return START_STICKY;
}
}
我在AndroidManifest.xml文件中包含了必要的权限。需要显示当前位置。
<uses-permission
android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
uses-permission android:name="android.permission.INTERNET"/>
答案 0 :(得分：2)
MainActivity：
import android.location.Address;
import android.location.Location;
import com.example.havadurumumenu.MyLocationManager.LocationHandler;
public class MainActivityextends Activity implements LocationHandler{
public MyLocationManager locationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
currentLocation();
}
});
}
public void currentLocation(){
locationManager = new MyLocationManager();
locationManager.setHandler(this);
boolean isBegin = locationManager.checkProvidersAndStart(getApplicationContext());
if(isBegin){
//if at least one of the location providers are on it comes into this part.
}else{
//if none of the location providers are on it comes into this part.
}
}
@Override
public void locationFound(Location location) {
Log.d("LocationFound", ""+location);
//you can reach your Location here
//double latitude = location.getLatitude();
//double longtitude = location.getLongitude();
locationManager.removeUpdates();
}
@Override
public void locationTimeOut() {
locationManager.removeUpdates();
//you can set a timeout in MyLocationManager class
txt.setText("Unable to locate. Check your phone's location settings");
}
MyLocationManager：
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.annotation.SuppressLint;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
/*---------- Listener class to get coordinates ------------- */
public class MyLocationManager implements LocationListener {
public LocationManager locationManager;
public LocationHandler handler;
private boolean isLocationFound = false;
public MyLocationManager() {}
public LocationHandler getHandler() {
return handler;
}
public void setHandler(LocationHandler handler) {
this.handler = handler;
}
@SuppressLint("HandlerLeak")
public boolean checkProvidersAndStart(Context context){
boolean isBegin = false;
Handler stopHandler = new Handler(){
public void handleMessage(Message msg){
if (!isLocationFound) {
handler.locationTimeOut();
}
}
};
stopHandler.sendMessageDelayed(new Message(), 15000);
locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 1000, this);
isBegin = true;
}
if(locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 5000, 1000, this);
isBegin = true;
}
return isBegin;
}
public void removeUpdates(){
locationManager.removeUpdates(this);
}
/**
* To get city name from coordinates
* @param location is the Location object
* @return city name
*/
public String findCity(Location location){
/*------- To get city name from coordinates -------- */
String cityName = null;
Geocoder gcd = new Geocoder(AppController.getInstance(), Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
cityName = addresses.get(0).getLocality();
}
catch (IOException e) {
e.printStackTrace();
}
return cityName;
}
@Override
public void onLocationChanged(Location loc) {
isLocationFound = true;
handler.locationFound(loc);
}
@Override
public void onProviderDisabled(String provider) {}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
public interface LocationHandler{
public void locationFound(Location location);
public void locationTimeOut();
}
}
还在Manifest.xml中添加以下所有权限
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
答案 1 :(得分：0)
我通过交换两种方法的位置来解决。
如果未启用GPS，则使用GPS尝试获取位置的第一个应用，然后使用网络提供商方法。
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 double latitude;
public 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;
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 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();
}
}
}
// if Network Provider Enabled get lat/long using GPS Services
if (isNetworkEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
updateGPSCoordinates();
}
}
}
}
} catch (Exception e) {
// e.printStackTrace();
Log.e("Error : Location",
"Impossible to connect to LocationManager", e);
}
return location;
}
public void updateGPSCoordinates() {
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
return latitude;
}
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
return longitude;
}
}