Java 某些设备返回纬度和经度0.0
活动电话Java 某些设备返回纬度和经度0.0,java,android,android-gps,Java,Android,Android Gps,活动电话 import android.app.AlertDialog; import android.app.Service; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.location.Location; import android.location.LocationListener; import
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;
public class GPSTracker extends Service implements LocationListener {
private 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( ) {
}
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 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;
}
}
有时返回lat long需要时间。添加一个if-else条件以检查lat-long是否为0.0。如果lat long为0,请再次调用该方法以获取位置。我也面临同样的问题,所以我一次又一次地调用该方法,在两次三次点击后,它给出了lat long 注:GPS跟踪器是非常古老的代码。您可以使用融合api进行定位,而不是使用它 我的代码:
GPSTracker gpsTracker=new GPSTracker(CitymanagerActivity.this);
if (gpsTracker.canGetLocation()) {
double latitude = gpsTracker.getLatitude();
double longitude = gpsTracker.getLongitude();
Toast.makeText(CitymanagerActivity.this, latitude + " @@@Works@@@ " + longitude + "", Toast.LENGTH_LONG).show();
}
1不要使用GPSTracker。这门课多年来一直被认为是完全不及格的。它有时有效,但在概念层面上,它对位置的假设存在缺陷。我在这里有一篇关于它的博文:
2这就是假定getLastKnownLocation有效时发生的情况。很少是这样。它应该只用于优化,如果你知道你在做什么的话。GPSTracker的作者没有。您好。你的问题是什么?这是默认值。可能设备未收集到有效位置或服务已禁用。尽管如此,您仍在陈述一些事情,我们不知道您打算做什么。如果您不希望您的用户在几内亚湾,这是一个很容易检测和处理的情况。您好@commonware先生,我也在努力解决这个问题,您能帮助plz吗
private void getLatLong() {
try {
mLatitudeOrigin = GPSTracker.latitude;
mLongitudeOrigin = GPSTracker.longitude;
if (mLatitudeOrigin.toString().equals("0.0")) {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
mLatitudeOrigin = GPSTracker.latitude;
mLongitudeOrigin = GPSTracker.longitude;
if (mLatitudeOrigin.toString().equals("0.0")) {
getLatLong();
}
System.out.println("---mLatLngList iterateAllLocation 1---" + mLatLngList);
}
}, 1000);
} else {
System.out.println("---mLatLngList iterateAllLocation 2---" + mLatLngList);
}
} catch (Exception e) {
e.printStackTrace();
}
}