android-LocationManager返回0.0表示纬度和经度
我想在用户单击按钮时获取当前纬度和经度。为此，我编写了以下代码：android-LocationManager返回0.0表示纬度和经度,android,google-maps,android-gps,Android,Google Maps,Android Gps,我想在用户单击按钮时获取当前纬度和经度。为此，我编写了以下代码： LocationManager mlocManager=null; LocationListener mlocListener; mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); mlocL
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)));
}
如何解决这个问题 缺少getLastKnownLocation
。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();
}
像这样试试
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) {
}
});
这个文件将为您完成这项工作。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
}
}
我注意到，使用定位功能，您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，我会在我的应用程序类中包含我的代码，例如，当用户单击按钮时，您调用应用程序类中的一个方法，并让用户知道（通过进度对话框？？）他们应该等待获得纬度和经度
下一步是使用事件通知活动或位置可用性片段，然后在获得数据后关闭进度对话框
只需知道，当你想立即获得当前位置时，你无法轻松获得。有时，在室内，它甚至不能像预期的那样工作
祝你好运 无论您是否尝试真正的设备和模拟器MyLocationListener的代码在哪里？您必须调用lastKnownLocation（）
方法。