我有一个 LocationService ，它会启动 MainActivity 的onResume()并停止onDestroy()。
@Override
protected void onResume() {
super.onResume();
//Start the service using alaram manager
//If its not running currently
if (isLocationServiceRunning(this)) {
am = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent intent = new Intent(this, LocationService.class);
pi = PendingIntent.getService(this, 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
am.cancel(pi);
am.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime(), 1 * 60 * 1000, pi);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (isLocationServiceRunning(this)) {
stopService(new Intent(this, LocationService.class));
if (am != null && pi != null) {
am.cancel(pi);
}
}
}
LocationService.java
public class LocationService extends Service implements LocationListener {
public static double curLat = 0.0;
public static double curLng = 0.0;
private LocationManager mgr;
private String best;
private Location location;
private Location currentBestLocation;
private static final int TWO_MINUTES = 1000 * 60 * 2;
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
mgr = (LocationManager) getSystemService(LOCATION_SERVICE);
boolean gps_enabled = mgr
.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (gps_enabled) {
// If GPS is enabled, set criteria as ACCURACY_FINE
// and get the best provider(which usually will be GPS_PROVIDER)
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
best = mgr.getBestProvider(criteria, true);
// getLastKnownLocation so that user don't need to wait
location = mgr.getLastKnownLocation(best);
if (location == null) {
// request for a single update, and try again.
// Later will request for updates every 10 mins
mgr.requestSingleUpdate(criteria, this, null);
location = mgr
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
if (location != null) {
// If the GPS gives a location, update curLat and curLng
dumpLocation(location);
} else {
// If the location is still null, go for NETWORK_PROVIDER
best = LocationManager.NETWORK_PROVIDER;
location = mgr.getLastKnownLocation(best);
if (location != null) {
// If the NETWORK gives a location, update curLat and curLng
dumpLocation(location);
}
}
// Register the Location Manager for updates, with both the
// providers
// Since GPS updates are expensive, we ask update every 10 mins and
// unregister updates if GPS is disabled in onProviderDisabled
// callback
mgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,
10 * 60 * 1000, 50, this);
// NETWORK_PROVIDER updates every 20 secs
mgr.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
20 * 1000, 0, this);
return START_NOT_STICKY;
} else {
// If GPS is disables, go with NETWORK_PROVIDER
best = LocationManager.NETWORK_PROVIDER;
location = mgr.getLastKnownLocation(best);
if (location != null) {
dumpLocation(location);
}
// Register NETWORK_PROVIDER for updates every 20 secs
mgr.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
20 * 1000, 0, this);
return START_NOT_STICKY;
}
}
private void dumpLocation(Location l) {
// Called to update the curLat and curLng.
currentBestLocation = l;
SimpleDateFormat s = new SimpleDateFormat("dd/MM/yyyy:hh:mm:ss",
Locale.ENGLISH);
String format = s.format(l.getTime());
try {
Geocoder coder = new Geocoder(this);
List<Address> address;
Address location = null;
address = coder.getFromLocation(l.getLatitude(), l.getLongitude(),
1);
location = address.get(0);
} catch (Exception e) {
Log.e("Exception while getting address", e.getMessage() + "");
}
curLat = l.getLatitude();
curLng = l.getLongitude();
}
@Override
public void onLocationChanged(Location location) {
// called when location is changed, since we registered Location
// Providers
// for updates
if (isBetterLocation(location, currentBestLocation)) {
dumpLocation(location);
} else {
Log.d("Not a Better Location", "Ignore");
}
}
@Override
public void onProviderDisabled(String provider) {
// Check if best(the currently being used provider) is not null
if (best != null) {
// if best and disabled provider are same, the remove updates
if ((provider.equalsIgnoreCase(LocationManager.GPS_PROVIDER) && best
.equals(LocationManager.GPS_PROVIDER))
|| provider
.equalsIgnoreCase(LocationManager.NETWORK_PROVIDER)
&& best.equals(LocationManager.NETWORK_PROVIDER)) {
if (mgr != null) {
mgr.removeUpdates(this);
}
}
}
}
@Override
public void onProviderEnabled(String provider) {
// This will be taken care in the onStartCommand where if gps_enabled
// case is used.
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// No need to care about, because any thing like OUT_OF_SERVICE occurs,
// location being fetched will be null and such cases are handled above.
if ((provider.equals(LocationManager.GPS_PROVIDER))
&& (LocationProvider.OUT_OF_SERVICE == status)) {
if (mgr != null) {
mgr.removeUpdates(this);
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
// triggered when we call stopService(LocationService);
// which is done in onDestroy of MainActivity
// Because LocationService must be stopped
// when application is closed to avoid data usage
if (mgr != null) {
mgr.removeUpdates(this);
}
}
protected boolean isBetterLocation(Location location,
Location currentBestLocation) {
if (currentBestLocation == null) {
// A new location is always better than no location
return true;
}
// Check whether the new location fix is newer or older
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;
// If it's been more than two minutes since the current location, use
// the new location
// because the user has likely moved
if (isSignificantlyNewer) {
return true;
// If the new location is more than two minutes older, it must be
// worse
} else if (isSignificantlyOlder) {
return false;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation
.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
// Not significantly newer or older, so check for Accuracy
if (isMoreAccurate) {
// If more accurate return true
return true;
} else if (isNewer && !isLessAccurate) {
// Same accuracy but newer, return true
return true;
} else if (isNewer && !isSignificantlyLessAccurate
&& isFromSameProvider) {
// Accuracy is less (not much though) but is new, so if from same
// provider return true
return true;
}
return false;
}
// Checks whether two providers are the same
private boolean isSameProvider(String provider1, String provider2) {
if (provider1 == null) {
return provider2 == null;
}
return provider1.equals(provider2);
}
}
服务肯定会按预期启动和停止，我可以在日志中看到位置详细信息，这很好。
问题是，当我移动到完全不同的位置（300英里）时， curLat 和 curLng 值仍然保持旧的值，当我打开应用
是因为我在设备运行时没有运行服务（因为我的应用程序没有运行）？
因为当我打开其他应用程序（如FourSquare（获取正确的位置））然后重新打开我的应用程序时，它会显示正确的位置。
我还应该做些什么来正确刷新位置。
答案 0 :(得分：3)
如果您希望将位置放在前台，您的代码看起来非常好。我已经深入了解并且知道在onDestroy你已经停止了服务和警报。因此，当当前应用程序进入后台并且系统调用onDestroy时，代码无法更新后台中的位置。当你再次启动应用程序时，它会启动服务并且第一次获得缓存的旧位置。
当其他应用程序更新位置时，您将根据mgr.getLastKnownLocation(best)的文档获取该位置。
因此，要解决此问题，请不要在此处使用警报以重复方式启动服务或将其破坏。
只需启动服务，然后在onStartCommand中请求更新位置。如果您想摆脱位置更新，请使用removeLocationUpdates(LocationListener)。
此处给出了示例http://developer.android.com/training/location/receive-location-updates.html
答案 1 :(得分：3)
我认为你的问题在这里
best = mgr.getBestProvider(criteria, true);
// getLastKnownLocation so that user don't need to wait
location = mgr.getLastKnownLocation(best);
if (location == null) {
// request for a single update, and try again.
// Later will request for updates every 10 mins
mgr.requestSingleUpdate(criteria, this, null);
location = mgr
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
因为先前位置location = mgr.getLastKnownLocation(best);会返回该位置而不会启动提供商（请参阅the android documentation。所以该位置不为空且mgr.requestSingleUpdate(criteria, this, null);永远不会跑。
要获取最新的位置数据，必须启动提供程序。
所以纠正可能是：
best = mgr.getBestProvider(criteria, true);
// getLastKnownLocation so that user don't need to wait
mgr.requestSingleUpdate(best, this, null);
location = mgr.getLastKnownLocation(best);
此外，我不确定是否有意，但即使GPS数据可用且更准确，此服务也将使用网络提供商（由于GPS更新和数据过时选择了10分钟和2分钟。
P.S。是否有特定原因您不想使用属于Google Play服务的FusedLocationProvider？我发现它更简单，它应该针对选定的最佳供应商进行优化并节省电池。
答案 2 :(得分：1)
我最好的猜测是转储＆＃34; isBetterLocation＆＃34;并尝试没有它看看会发生什么。根据这些检查（相当复杂），我认为错误是在＃34; isSignificantlyOlder＆＃34;或者在最后一个返回语句中（否则你会得到新的位置，对吗？）
您是否调试过它以检查当前逻辑是否正确，如果是，是在什么距离？
答案 3 :(得分：1)
以下是使用Google Play服务接收位置更新的示例
这是MyActivity类
public class MyActivity extends Activity implements
ConnectionCallbacks, OnConnectionFailedListener {
public static final int PLAY_SERVICES_NOT_AVAILABLE_REQUEST = 9000;
public static final int CONNECTION_FAILED_REQUEST = 1000;
private LocationClient mLocationClient;
private LocationRequest mLocationrequest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_myactivity);
LocationManager mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mLocationClient = new LocationClient(this, this, this);
boolean isGPSEnabled = mLocationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean isNetworkEnabled = mLocationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
Toast.makeText(this, "GPS: " + isGPSEnabled, Toast.LENGTH_SHORT).show();
Toast.makeText(this, "Network: " + isNetworkEnabled, Toast.LENGTH_SHORT)
.show();
if (isGooglePlayServicesAvailable()) {
mLocationClient.connect();
} else {
// play services not available
}
}
private void defineLocationRequest() {
mLocationrequest = new LocationRequest();
mLocationrequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(5000);
}
private PendingIntent getCallBackIntent() {
return PendingIntent
.getService(getApplicationContext(), 0, new Intent(this,
MyIntentService.class),
PendingIntent.FLAG_UPDATE_CURRENT);
}
private boolean isGooglePlayServicesAvailable() {
int resultCode = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(this);
if (resultCode == ConnectionResult.SUCCESS) {
Log.d("Car Tracking", "play services available.");
return true;
} else {
Log.d("Car Tracking", "play services not available(resultCode:) "
+ resultCode);
GooglePlayServicesUtil.getErrorDialog(resultCode, this,
PLAY_SERVICES_NOT_AVAILABLE_REQUEST).show();
return false;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
switch (requestCode) {
case PLAY_SERVICES_NOT_AVAILABLE_REQUEST:
if (resultCode == Activity.RESULT_OK) {
// check again
}
break;
case CONNECTION_FAILED_REQUEST:
if (resultCode == Activity.RESULT_OK) {
// try to connect LocationClient Againg
}
break;
}
}
@Override
public void onConnectionFailed(ConnectionResult arg0) {
// TODO Auto-generated method stub
if (arg0.hasResolution()) {
try {
arg0.startResolutionForResult(this, CONNECTION_FAILED_REQUEST);
} catch (SendIntentException e) {
Log.d("TAG",
"Exception in resolving connection failed: "
+ e.toString());
}
}
}
@Override
public void onConnected(Bundle arg0) {
// TODO Auto-generated method stub
defineLocationRequest();
mLocationClient.requestLocationUpdates(mLocationrequest,
getCallBackIntent());
}
@Override
public void onDisconnected() {
// TODO Auto-generated method stub
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
mLocationClient.removeLocationUpdates(getCallBackIntent());
super.onDestroy();
}
}
现在，这是MyIntentService类的onHandleIntent方法。
protected void onHandleIntent(Intent intent) {
// TODO Auto-generated method stub
if (intent != null) {
Bundle extra = intent.getExtras();
Location location = (Location) extra
.get(LocationClient.KEY_LOCATION_CHANGED);
}
此处，位置对象将为您提供最新的位置更新
同时添加
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
答案 4 :(得分：0)
您可以使用Google Play服务中的LocationClient，它易于使用并且经过验证非常高效。 以下是example
的链接答案 5 :(得分：0)
答案 6 :(得分：0)
使用融合位置提供程序（自4.2以来可用的新功能 - https://developer.android.com/google/play-services/location.html） - 它只是获取当前快速位置并发送更新。
示例：http://www.motta-droid.com/2013/11/location-requests-for-your-app-how-to.html
只需在服务中运行上面的单例，并根据需要调整位置更新参数。
您应该关心的唯一问题 - 如果它根本无法确定您当前的位置。例如，如果您的设备只有GPS位置提供商，那么您就在室内。
答案 7 :(得分：0)
我观察了您的代码..您正在更新位置，但您没有收到更新的位置信息。以下是如何从服务中获取位置的代码
// Send an Intent with an action named "custom-event-name". The Intent sent
// should
// be received by the ReceiverActivity.
private static void sendMessageToActivity(Location l, String msg) {
Intent intent = new Intent("GPSLocationUpdates");
// You can also include some extra data.
intent.putExtra("Status", msg);
Bundle b = new Bundle();
b.putParcelable("Location", l);
intent.putExtra("Location", b);
LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
}
在您的主要活动中或必须接收位置信息写下此代码。
LocalBroadcastManager.getInstance(getActivity()).registerReceiver(
mMessageReceiver, new IntentFilter("GPSLocationUpdates"));
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Bundle b = intent.getBundleExtra("Location");
lastKnownLoc = (Location) b.getParcelable("Location");
if (lastKnownLoc != null) {
tvLatitude.setText(String.valueOf(lastKnownLoc.getLatitude()));
tvLongitude
.setText(String.valueOf(lastKnownLoc.getLongitude()));
}
}
};
我希望这会奏效......
答案 8 :(得分：0)
我不介意等待GPS实现首次修复，这可能会对您有所帮助。如果最近发现修复，第一次修复只需几秒钟。
我已经实现了一些代码，只要有来自http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/的GPSTracker的第一次修复和位置更改，就会发送回调。
通过此实现，您可以：
private GPSTracker gps;
private FirstFixListener firstFixListener;
private LocationUpdateListener locationUpdateListener;
private void startGPS() {
gps = GPSTracker.getInstance(context);
// create listeners
firstFixListener = new MyFirstFixListener();
locationUpdateListener = new MyLocationUpdateListener();
// start the gps
gps.startUsingGPS(firstFixListener, locationUpdateListener);
}
private void stopGPS() {
// stop the gps and unregister callbacks
gps.stopUsingGPS(firstFixListener, locationUpdateListener);
}
private class MyFirstFixListener implements FirstFixListener {
@Override
public void onFirsFixChanged(boolean hasGPSfix) {
if (hasGPSfix == true) {
// accurate position
Location position = gps.getLocation();
}
}
}
private class MyLocationUpdateListener implements LocationUpdateListener {
@Override
public void onLocationChanged(Location location) {
// hand you each new location from the GPS
// you do not need this if you only want to get a single position
}
}
这是我对GPSTracker的实现：
public class GPSTracker extends Service implements LocationListener {
private static final String TAG = "GPSTracker";
/**
* Register to receive callback on first fix status
*
* @author Morten
*
*/
public interface FirstFixListener {
/**
* Is called whenever gps register a change in first-fix availability
* This is valuable to prevent sending invalid locations to the server.
*
* @param hasGPSfix
*/
public void onFirsFixChanged(boolean hasGPSfix);
}
/**
* Register to receive all location updates
*
* @author Morten
*
*/
public interface LocationUpdateListener {
/**
* Is called every single time the GPS unit register a new location
* The location param will never be null, however, it can be outdated if hasGPSfix is not true.
*
* @param location
*/
public void onLocationChanged(Location location);
}
private Context mContext;
// flag for GPS status
private List<FirstFixListener> firstFixListeners;
private List<LocationUpdateListener> locationUpdateListeners;
boolean isGPSFix = false;
boolean isGPSEnabled = false;
private GPSFixListener gpsListener;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
long mLastLocationMillis;
private boolean logLocationChanges;
// Declaring a Location Manager
protected LocationManager locationManager;
/** removed again as we need multiple instances with different callbacks **/
private static GPSTracker instance;
public static GPSTracker getInstance(Context context) {
if (instance != null) {
return instance;
}
return instance = new GPSTracker(context);
}
private GPSTracker(Context context) {
this.mContext = context;
gpsListener = new GPSFixListener();
firstFixListeners = new ArrayList<GPSTracker.FirstFixListener>();
locationUpdateListeners = new ArrayList<GPSTracker.LocationUpdateListener>();
}
public boolean hasGPSFirstFix() {
return isGPSFix;
}
private void addFirstFixListener(FirstFixListener firstFixListener) {
this.firstFixListeners.add(firstFixListener);
}
private void addLocationUpdateListener(
LocationUpdateListener locationUpdateListener) {
this.locationUpdateListeners.add(locationUpdateListener);
}
private void removeFirstFixListener(FirstFixListener firstFixListener) {
this.firstFixListeners.remove(firstFixListener);
}
private void removeLocationUpdateListener(
LocationUpdateListener locationUpdateListener) {
this.locationUpdateListeners.remove(locationUpdateListener);
}
public void setLogLocationChanges(boolean logLocationChanges) {
this.logLocationChanges = logLocationChanges;
}
public Location getLocation() {
return location;
}
private Location startLocationListener() {
canGetLocation = false;
try {
locationManager = (LocationManager) mContext
.getSystemService(Service.LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 0, 0, this);
locationManager.addGpsStatusListener(gpsListener);
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
} else {
showSettingsAlert();
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
public void stopUsingGPS(FirstFixListener firstFixListener,
LocationUpdateListener locationUpdateListener) {
if (firstFixListener != null)
removeFirstFixListener(firstFixListener);
if (locationUpdateListener != null)
removeLocationUpdateListener(locationUpdateListener);
stopUsingGPS();
}
/**
* Stop using GPS listener Calling this function will stop using GPS in your
* app
* */
public void stopUsingGPS() {
Log.d("DEBUG", "GPS stop");
if (locationManager != null) {
locationManager.removeUpdates(GPSTracker.this);
location = null;
if (gpsListener != null) {
locationManager.removeGpsStatusListener(gpsListener);
}
}
isGPSFix = false;
location = null;
}
public void startUsingGPS(FirstFixListener firstFixListener,
LocationUpdateListener locationUpdateListener) {
Log.d("DEBUG", "GPS start");
if (firstFixListener != null)
addFirstFixListener(firstFixListener);
if (locationUpdateListener != null)
addLocationUpdateListener(locationUpdateListener);
startLocationListener();
}
/**
* Function to get latitude
* */
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
} else {
Log.e("GPSTracker", "getLatitude location is null");
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
} else {
Log.e("GPSTracker", "getLongitude location is null");
}
// 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. 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();
}
@Override
public void onLocationChanged(Location location) {
if ( location == null)
return;
this.location = location;
mLastLocationMillis = SystemClock.elapsedRealtime();
canGetLocation = true;
if (isGPSFix) {
if (locationUpdateListeners != null) {
for (LocationUpdateListener listener : locationUpdateListeners) {
listener.onLocationChanged(location);
}
}
}
}
@Override
public void onProviderDisabled(String provider) {
canGetLocation = false;
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
private boolean wasGPSFix = false;
// http://stackoverflow.com/questions/2021176/how-can-i-check-the-current-status-of-the-gps-receiver
// answer from soundmaven
private class GPSFixListener implements GpsStatus.Listener {
public void onGpsStatusChanged(int event) {
switch (event) {
case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
isGPSFix = (SystemClock.elapsedRealtime() - mLastLocationMillis) < 3000;
if (isGPSFix != wasGPSFix) { // only notify on changes
wasGPSFix = isGPSFix;
for (FirstFixListener listener : firstFixListeners) {
listener.onFirsFixChanged(isGPSFix);
}
}
break;
case GpsStatus.GPS_EVENT_FIRST_FIX:
// Do something.
break;
}
}
}
}
答案 9 :(得分：0)
我正在使用此代码来定位我的位置并且它工作正常。
initilizeMap();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean isNetworkEnabled = locationManager .isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(isGPSEnabled==true){
if (!isGPSEnabled && !isNetworkEnabled) {
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
400,
1000, this);
Log.d("Network", "Network Enabled");
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,
400,
1000, this);
Log.d("GPS", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
onLocationChanged(location);
MarkerOptions marker = new MarkerOptions().position(new LatLng(location.getLatitude(),location.getLongitude())).title("Vous êtes ici");
googleMap.addMarker(marker);
}
private void initilizeMap() {
if (googleMap == null) {
SupportMapFragment sp =(SupportMapFragment) getSupportFragmentManager().findFragmentById(
R.id.map);
googleMap=sp.getMap();
// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(getApplicationContext(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
}
}
}
@Override
protected void onResume() {
super.onResume();
initilizeMap();
}
public void onLocationChanged(Location location) {
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 12);
googleMap.animateCamera(cameraUpdate);
locationManager.removeUpdates(this);
}
我希望这会对你有所帮助。祝你好运