我正在尝试根据WiFi/3G/4G连接获取位置，但它始终将0.0作为latitude and longitude返回。如果相同的代码与GPS ON一起使用，那么它可以工作，因此从4.4开始改变了一些东西。
还尝试了以下链接，但它也不起作用。
http://www.androidhive.info/2015/02/android-location-api-using-google-play-services/
public class GPSTracker extends Service implements LocationListener {
private static final String TAG = "GPSTracker";
private final Context mContext;
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
double speed;
double altitude;
double bearings;
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 5000; // 10 seconds
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
if (mContext == null)
Log.d("GPS Tracker", "Context is null");
locationManager = (LocationManager) mContext
.getSystemService(Context.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
Log.d("GPSTracker", "No 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("GPSTracker", "Network Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
altitude = location.getAltitude();
speed = location.getSpeed();
bearings = location.getBearing();
}
}
}
// 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("GPSTracker", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
altitude = location.getAltitude();
speed = location.getSpeed();
bearings = location.getBearing();
}
}
}
}
}
} 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;
}
@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;
}
}
是否有任何解决方案可以根据WiFi/Data以后的4.4 kitkat连接获取位置？
任何帮助/建议都将不胜感激。
答案 0 :(得分：6)
要遵循的步骤：
步骤1：检查清单文件中的以下权限
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
第2步：检查服务类
import android.annotation.SuppressLint;
public class GPSTracker extends Service implements LocationListener {
public static boolean isGPSEnabled = false;
public static boolean isNetworkEnabled = false;
static boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 2; // 2 meters
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
protected LocationManager locationManager;
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@SuppressWarnings("static-access")
@Override
public void onCreate() {
super.onCreate();
Log.d("onCreate", "Success !");
latitudeAndLongtitude();
}
public void latitudeAndLongtitude()
{
locationManager = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
Toast.makeText(getApplicationContext(), "No provider found!", Toast.LENGTH_SHORT).show();
}else{
GPSTracker.canGetLocation = true;
if(isGPSEnabled)
{
if (location == null) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "GPS");
if (locationManager != null) {
Log.d("locationManager", "is not null ");
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
Log.d("Network", "GPS lat and long gets ");
Toast.makeText(getApplicationContext(), "isNetworkEnabled!", Toast.LENGTH_SHORT).show();
latitude = location.getLatitude();
longitude = location.getLongitude();
Helper.savePreferences(getApplicationContext(), NameConversion.LATITUDE,String.valueOf(latitude));
Helper.savePreferences(getApplicationContext(), NameConversion.LONGITUDE,String.valueOf(longitude));
}else{
Log.d("location", "is getting null ");
}
}
}
}
else 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) {
//Toast.makeText(getApplicationContext(), "isGPSEnabled!", Toast.LENGTH_SHORT).show();
latitude = location.getLatitude();
longitude = location.getLongitude();
Helper.savePreferences(getApplicationContext(), NameConversion.LATITUDE,String.valueOf(latitude));
Helper.savePreferences(getApplicationContext(), NameConversion.LONGITUDE,String.valueOf(longitude));
}
}
}
}
}
public Location getLocation() {
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;
}
public void sendLocationToServer() {
Log.i("sendLocationToServer", "Called!");
}
@Override
public void onDestroy() {
super.onDestroy();
Log.i("onDestroy", "Called!");
stopSelf();
}
/**
* Function to check GPS/wifi enabled
*
* @return boolean
* */
@SuppressWarnings("static-access")
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog On pressing Settings button will
* lauch Settings Options
* */
@SuppressLint("NewApi")
@Override
public void onLocationChanged(Location location) {
latitudeAndLongtitude();
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}}
步骤3：在清单文件中启用服务
内部应用程序标记
<service
android:name=“.your package name.GPSTracker"
android:enabled="true" >
</service>
setp 4：在你想要的地方启动服务
希望如果您遇到问题，这将有效，可能是您的手机无法获得GPS和网络定位。
答案 1 :(得分：2)
当您致电locationManager.requestLocationUpdates()时，这告诉Android您希望在用户的位置发生变化时回叫。如果您没有启用GPS并且想要使用NETWORK_PROVIDER，则需要访问Internet。这一切都是异步发生的。您拨打requestLocationUpdates()然后一段时间后，Android会通过拨打onLocationChanged()新地点给您回电。
在调用requestLocationUpdates()后，您正在做的是立即调用getLastKnownLocation()，这可能会或可能不会返回有用的内容。在您onLocationChanged()的实施中，您什么都不做。您需要等到Android调用onLocationChanged()，此时您应该将传递的Location参数存储在您的成员变量中。
答案 2 :(得分：1)
我认为使用FusedLocationApi是更好的解决方案，请参阅https://developer.android.com/training/location/retrieve-current.html