android -LocationManager 为纬度和经度返回 0.0
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【中文标题】android -LocationManager 为纬度和经度返回 0.0【英文标题】：android -LocationManager return 0.0 for latitude and longitude 【发布时间】：2016-09-15 20:15:46 【问题描述】：当用户单击按钮时，我想获取当前的纬度和经度。为此，我编写了以下代码：
LocationManager mlocManager=null;
LocationListener mlocListener;
mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
if (mlocManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
Log.v("this",MyLocationListener.latitude+ " lat");
if(MyLocationListener.latitude>0)
in = new Intent(DrawerActivity.this, Barbers.class);
in.putExtra("w", "nearest");
in.putExtra("latitude",Double.toString(MyLocationListener.latitude));
in.putExtra("longitude",Double.toString(MyLocationListener.longitude));
startActivity(in);
else
MyToast.makeText(DrawerActivity.this, Z_Farsi.Convert(getString(R.string.gpsfinding)));
else
MyToast.makeText(DrawerActivity.this, Z_Farsi.Convert(getString(R.string.gpsoffline)));
gps 已开启，当前位置完美显示在谷歌地图上。
有什么问题？为什么它返回 0.0 ？
如何解决这个问题？
【问题讨论】：
你是否试用真机和模拟器 MyLocationListener 的代码在哪里？ 你必须调用lastKnownLocation()方法。
【参考方案1】：
getLastKnownLocation 丢失。你应该有这样的东西：
Location location = null;
if (mlocManager!= null)
location = mlocManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null)
latitude = location.getLatitude();
longitude = location.getLongitude();
【讨论】：
【参考方案2】：此文件将为您完成工作。它将从网络运营商或 GPS 获取数据。
GPSTracker.java
public class GpsTracker extends Service implements LocationListener
private final Context mContext;
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
boolean canGetLocation = false;
Location location;
double latitude;
double longitude;
private final long MIN_DISTANCE = 10;
private final long MIN_TIME = 30;
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 enabled
else
this.canGetLocation = true;
// first get location from network provider
if (isNetworkEnabled)
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return null;
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME, MIN_DISTANCE, 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 provider
if (isGPSEnabled)
if (location == null)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME, MIN_DISTANCE, this);
Log.d("GPS provider", "GPS provider");
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)
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
locationManager.removeUpdates(GpsTracker.this);
// functions to get latitude and longitude
public double getLatitude()
if(location != null)
latitude = location.getLatitude();
return latitude;
public double getLongitude()
if(location != null)
longitude = location.getLongitude();
return longitude;
// function to check whether GPS/WiFi is enabled
public boolean canGetLocation()
return this.canGetLocation;
/* Function to show alert dialog
* on pressing settings button will launch settings options */
public void showAlertDialog()
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
alertDialog.setTitle("GPS Settings").setMessage("GPS not Enabled. /n Want to enable it ? ").setCancelable(false);
alertDialog.setPositiveButton("Settings", new OnClickListener()
@Override
public void onClick(DialogInterface arg0, int arg1)
// Implicit intent
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
);
alertDialog.setNegativeButton("No", new OnClickListener()
@Override
public void onClick(DialogInterface dialog, int arg1)
dialog.cancel();
);
alertDialog.show();
@Override
public IBinder onBind(Intent arg0)
// TODO Auto-generated method stub
return null;
@Override
public void onLocationChanged(Location arg0)
// TODO Auto-generated method stub
@Override
public void onProviderDisabled(String arg0)
// TODO Auto-generated method stub
@Override
public void onProviderEnabled(String arg0)
// TODO Auto-generated method stub
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2)
// TODO Auto-generated method stub
【讨论】：
【参考方案3】：这样试试
manager.requestLocationUpdates("gps", 10, 10, new LocationListener()
@Override
public void onLocationChanged(Location location)
double lat=location.getLatitude();
double lon=location.getLognitude()
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
@Override
public void onProviderEnabled(String provider)
@Override
public void onProviderDisabled(String provider)
);
【讨论】：
【参考方案4】：我注意到位置功能无法立即获取用户位置。您必须等待设备为您提供位置。
通常，我会将我的代码放在我的 Application 类中，然后例如当用户单击按钮时，您会调用应用程序类中的方法并让用户知道（通过进度对话框？？）他们应该等待要获取的经纬度。
接下来是使用事件通知活动或片段位置可用性，然后在获得数据后关闭进度对话框。
要知道，您无法立即轻松获得当前位置。有时，在室内时，它甚至无法按预期工作。
祝你好运！
【讨论】：
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