我无法使用我的代码获取当前位置
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【中文标题】我无法使用我的代码获取当前位置【英文标题】：I can't get my current location using my code 【发布时间】：2017-06-01 07:37:30 【问题描述】：GPSTracker 类
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 is 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)
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
@Override
public void onProviderDisabled(String provider)
@Override
public void onProviderEnabled(String provider)
@Nullable
@Override
public IBinder onBind(Intent intent)
return null;
-------------------------------------------------------------------------------
MainActivity 类
public class MainActivity extends AppCompatActivity
Button btnShowLocation;
private static final int REQUEST_CODE_PERMISSION = 2;
String mPermission = Manifest.permission.ACCESS_FINE_LOCATION;
// GPSTracker class
GPSTracker gps;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try
if (ActivityCompat.checkSelfPermission(this, mPermission)
!= MockPackageManager.PERMISSION_GRANTED)
ActivityCompat.requestPermissions(this, new String[]mPermission,
REQUEST_CODE_PERMISSION);
// If any permission above not allowed by user, this condition will
//execute every time, else your else part will work
catch (Exception e)
e.printStackTrace();
btnShowLocation = (Button) findViewById(R.id.button);
// show location button click event
btnShowLocation.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View arg0)
// create class object
gps = new GPSTracker(MainActivity.this);
// check if GPS enabled
if(gps.canGetLocation())
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: "
+ latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
else
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
);
我无法正确获取我的位置，它总是将 GPS 位置返回为 0 和 0，我在这里做错了什么？
【问题讨论】：
你在模拟器里试试？ 不，我在我的手机中试用该应用 @Gopibilla 你确定你的手机有 GPS 吗？因为并非所有手机都有它。 我使用 gps 导航到很多地方，我的手机是带有 android kitkat 的 lava iris fuel 60 您是否在 Manifest 中授予位置权限..？？ 【参考方案1】：文档中有一个很棒的示例：https://developer.android.com/reference/android/location/LocationManager.html。还有一个较新的版本 - FusedLocationsApi。我最近使用 Locationmanager 与 GPS 合作，希望它会有所帮助：
/** * This is an implementation of reader, which track use movement by GPS using old * LocationManager (there is another version for FusedLocationAPIs. * This class doesn't check if GPS is enabled - it is assumed to be enabled by default and * should be checked by code, using this class first. It is so, because both * LocationManager and version using FusedLocationApi prompt to enable GPS in the same manner. */ public class LocationManagerReader extends SensorReader implements LocationListener
// update location at least every second
private static final long MINIMAL_UPDATE_TIME = 1000;
// or at east when user move to 10 meters.
private static final long MINIMAL_UPDATE_DISTANCE = 10;
private LocationManager locationManager;
public LocationManagerReader(Context context)
super(context);
locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
/**
* Register this reader as LocationManager to listen for GPS updates with defined
* minimal update time and accuracy.
*/
@Override
protected void startPollingHardwareSensor()
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
MINIMAL_UPDATE_TIME, MINIMAL_UPDATE_DISTANCE, this);
/**
* Unsubscribe from location updates.
*/
@Override
protected void stopPollingHardwareSensor()
locationManager.removeUpdates(this);
/**
* Inherited from LocationListener
*/
/**
* Process new location in a background
* @param location
*/
@Override
public void onLocationChanged(Location location)
Observable.defer(() -> Observable.just(location))
.subscribeOn(Schedulers.computation())
.subscribe(loc -> processLocationUpdate(loc));
/**
* We're not interested in monitoring changes in gps state, need location updates only
* @param provider
* @param status
* @param extras
*/
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
/**
* We need a high accuracy, that is why use single GPS provider, network is not used -
* don't track changes in provider state
*
* @param provider
*/
@Override
public void onProviderEnabled(String provider)
@Override
public void onProviderDisabled(String provider)
/**
* get current time in nanoseconds and save latitude and longitude as values of reading.
* When we have reading, give it to base class for further processing
* @param location
*/
private void processLocationUpdate(Location location)
long timeStamp = System.nanoTime();
double lat = location.getLatitude();
double lon = location.getLongitude();
Reading reading = new Reading();
reading.timestamp = timeStamp;
reading.values[0] = lat;
reading.values[1] = lon;
getReadingPipe().onNext(reading);
【讨论】：
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