如何获取最准确的用户位置

Posted 2023-02-23

【中文标题】如何获取最准确的用户位置

【英文标题】：How to get the most accurate user location

【发布时间】：2014-05-10 05:55:12

【问题描述】：

嘿，我正在使用下面的代码来获取用户位置。它正在工作，但问题是当我尝试它时，它给了我一个距离我的位置 2 公里的位置。你建议我应该做什么，因为我正在创建一个紧急应用程序，我希望它显示确切的用户位置。

这里是主文件

GPSTracker.java

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 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;
            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;

我将位置显示为 toast 的地方

AndroidGPSTrackingActivity.java

public class AndroidGPSTrackingActivity extends Activity 

Button btnShowLocation;

// GPSTracker class
GPSTracker gps;

@Override
public void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.emergency);
    
    btnShowLocation = (Button) findViewById(R.id.btnShowLocation);
    
    // show location button click event
    btnShowLocation.setOnClickListener(new View.OnClickListener() 
        
        @Override
        public void onClick(View arg0)         
            // create class object
            gps = new GPSTracker(AndroidGPSTrackingActivity.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();
            
            
        
    );
    

【参考方案1】：

您可以使用LittleFluffy 库获取具有特定时间的位置，也可以检查 lastknownlocation 的准确性和时间戳以获得最佳所需位置。