android - 无法获取当前位置坐标

Question

我想获取当前的经度和纬度作为int

所以我用这段代码

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,
                0, this);

        Location location = locationManager
                .getLastKnownLocation(LocationManager.GPS_PROVIDER);


        try {
            gps_enabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
        } catch (Exception ex) {
        }
        try {
            network_enabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        } catch (Exception ex) {
        }

        // don't start listeners if no provider is enabled
        if (!gps_enabled && !network_enabled) {
               ....Notify
        }

        if (gps_enabled) {
            if (location != null) {
                 longitude =(int) (location.getLongitude()*1e6);
                 latitude = (int) (location.getLatitude()*1e6);
String accuracy = "Accuracy: " + location.getAccuracy();
            } 
        }
        if (network_enabled) {
            if (location != null) {

                 longitude =(int) (location.getLongitude()*1e6);
                 latitude = (int) (location.getLatitude()*1e6);
                String accuracy = "Accuracy: " + location.getAccuracy();
            } 
            }

        locationManager.removeUpdates(this);

不幸的是，经度和纬度始终为空。

我拥有 list 中所需的所有权限。

我该如何解决这个问题？

Answer 1

这就是我用于位置监听器的东西

import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;

public class LocationUtils implements LocationListener{

 Context context;
 private String provider;
 private LocationManager locationManager;
 private String latitude="no value";
 private String longitude="no value";
 public LocationUtils(Context context) {
     this.context=context;
     // Get the location manager
        locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        // Define the criteria how to select the locatioin provider -> use
        // default
        latitude="no value";
        longitude="no value";
        Criteria criteria = new Criteria();
        provider = locationManager.getBestProvider(criteria, false);
        Location location = locationManager.getLastKnownLocation(provider);

        // Initialize the location fields
        if (location != null) {
            /*Toast.makeText(context, "Provider " + provider + " has been selected.",
                    Toast.LENGTH_SHORT).show();*/
         // System.out.println("Provider " + provider + " has been selected.");
          onLocationChanged(location);
        } else {
            /*Toast.makeText(context, "Location not available",
                    Toast.LENGTH_SHORT).show();*/
        }
 }


@Override
public void onLocationChanged(Location location) {
    double lat = (double) (location.getLatitude());
    double lng = (double) (location.getLongitude());
    latitude = lat + "";
    longitude = lng + "";
   /* Toast.makeText(context, " lat: "+lat +"  Long:"+lng,
            Toast.LENGTH_SHORT).show(); */  
}

@Override
public void onProviderDisabled(String provider) {
     //Toast.makeText(context, "Disabled provider " + provider,
        //        Toast.LENGTH_SHORT).show();       
}

@Override
public void onProviderEnabled(String provider) {
    //Toast.makeText(context, "Enabled new provider " + provider,
      //      Toast.LENGTH_SHORT).show();
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}
public String getLatitude() {
    return latitude;
}

public String getLongitude() {
    return longitude;
}


}

现在在你的 Activity 中你可以获得

 LocationUtils appLocationManager = new LocationUtils(getContext());
 String latitude = appLocationManager.getLatitude();
 String longitude = appLocationManager.getLongitude();

另加

 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
in your manifest file