选址问题

Question

大家好，我是android新手，我有一个小问题，如果有人能帮助我，我将不胜感激。

首先，我试图显示所有可用的位置提供商，但它不起作用；第二，当我运行it时，我无法从最好的可用提供商(我有我的wifi和网络提供商)那里获得任何位置信息。

package com.paad.whereami;

import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;

public class WhereAmI extends Activity {

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    LocationManager locationManager;
    String context = Context.LOCATION_SERVICE;
    locationManager = (LocationManager)getSystemService(context);
    boolean enabledOnly = true;
    List<String> providers = locationManager.getProviders(enabledOnly);

    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_FINE);
    criteria.setAltitudeRequired(false);
    criteria.setBearingRequired(false);
    criteria.setCostAllowed(true);
    criteria.setPowerRequirement(Criteria.POWER_LOW);
    criteria.setSpeedRequired(true);
    String provider = locationManager.getBestProvider(criteria, true);   

      Location location = locationManager.getLastKnownLocation(provider);
    updateWithNewLocation(location);

    locationManager.requestLocationUpdates(provider, 2000, 1,
                                           locationListener);
  }


  private final LocationListener locationListener = new LocationListener() {
    public void onLocationChanged(Location location) {
      updateWithNewLocation(location);
    }

    public void onProviderDisabled(String provider){
      updateWithNewLocation(null);
    }



 public void onProviderEnabled(String provider){ }
    public void onStatusChanged(String provider, int status,
                                Bundle extras){ }
  };

  private void updateWithNewLocation(Location location) {
    String latLongString;
    TextView myLocationText;
    myLocationText = (TextView)findViewById(R.id.myLocationText);

    String addressString = "No address found";

    if (location != null) {
      double lat = location.getLatitude();
      double lng = location.getLongitude();
      latLongString = "Lat:" + lat + "\nLong:" + lng;

      double latitude = location.getLatitude();
      double longitude = location.getLongitude();
      Geocoder gc = new Geocoder(this, Locale.getDefault());
      try {
        List<Address> addresses = gc.getFromLocation(latitude, longitude, 1);
        StringBuilder sb = new StringBuilder();
        if (addresses.size() > 0) {
          Address address = addresses.get(0);

          for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
            sb.append(address.getAddressLine(i)).append("\n");

            sb.append(address.getLocality()).append("\n");
            sb.append(address.getPostalCode()).append("\n");
            sb.append(address.getCountryName());
        }
        addressString = sb.toString();
      } catch (IOException e) {}
    } else {
      latLongString = "No location found";
    }
    myLocationText.setText("Your Current Position is:\n" +
                            latLongString + "\n" + addressString);
  }
}

Answer 1

我以前也有同样的问题，在搜索了一个lot...came的解决方案后，可以通过以下code...actuallu获得设备的即时位置，我们不能立即有全球定位系统的响应，所以我们可以有我们的位置根据蜂窝发射塔或wifi。因此，使其中一个能够获得您设备的即时位置。

@Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.leopard_screen);

            FindLocation(this);
        }


        public void FindLocation(Context context) {

            locationManager = (LocationManager) context
                    .getSystemService(Context.LOCATION_SERVICE);

            gps_enabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);
            network_enabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (network_enabled) {
                locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER, 0, 0,
                        locationListenerNetwork);
                Log.i("@@@@@@@@@@ Network provider is enabled", "Network Provider");
            } else {
                Toast.makeText(LeopardScreen.this,
                        "Network provider is not enabled", 2000);
            }

            if (gps_enabled) {
                locationManager.requestLocationUpdates(
                        LocationManager.GPS_PROVIDER, 0, 0, locationListenerGPS);
                Log.i("@@@@@@@@@@ GPS provider is enabled", "GPS Provider");
            } else {
                Toast.makeText(LeopardScreen.this, "GPS provider is not enabled",
                        2000);
            }

            if(!network_enabled && !gps_enabled) {
                currentLocation = getMyLastKnownLocation();
                currentLatitude = currentLocation.getLatitude();
                currentLongitude = currentLocation.getLongitude();

                Log.i("@@@@@@@@ Both location provider disabled",
                        "getMylastKnownLocation = "+String.valueOf(currentLatitude)
                        + " : " + String.valueOf(currentLongitude));
                Toast.makeText(LeopardScreen.this,"LastKnownLocation\n"+String.valueOf(currentLatitude) + "\n"
                                + String.valueOf(currentLongitude), 3000).show();
                Intent intent = new Intent(LeopardScreen.this, mainActivity.class);
                startActivity(intent);
            }

        }

        LocationListener locationListenerNetwork = new LocationListener() {
            public void onLocationChanged(Location location) {
                updateLocation(location);
                handler.removeCallbacks(runnable);
                Log.i("@@@@@@@@ Inside FindLocation", "Inside FindLocation");
                Toast.makeText(
                        LeopardScreen.this,"Network Location \n"+
                        String.valueOf(currentLatitude) + "\n"
                                + String.valueOf(currentLongitude), 5000).show();

            }

            public void onStatusChanged(String provider, int status, Bundle extras) {

            }

            public void onProviderEnabled(String provider) {
            }

            public void onProviderDisabled(String provider) {
            }

        };

        LocationListener locationListenerGPS = new LocationListener() {

            @Override
            public void onLocationChanged(Location location) {
                updateLocation(location);

                Log.i("@@@@@@@@@@ Inside onLocationChangedGPS", String
                        .valueOf(currentLatitude)
                        + " : " + String.valueOf(currentLongitude));

                Toast.makeText(
                        LeopardScreen.this,
                        "GPS Location \n" + String.valueOf(currentLatitude) + "\n"
                                + String.valueOf(currentLongitude), 5000).show();

            }

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

            }

            @Override
            public void onProviderEnabled(String provider) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onProviderDisabled(String provider) {
                // TODO Auto-generated method stub

            }

        };

        public Location getMyLastKnownLocation () {


                Location locNetwrok = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                Location locGPS = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                if(locNetwrok != null)
                    return locNetwrok;
                else if(locGPS != null)
                    return locGPS;

                return null;
        }

        void updateLocation(Location location) {
            currentLocation = location;
            currentLatitude = currentLocation.getLatitude();
            currentLongitude = currentLocation.getLongitude();

            Log.i("@@@@@@@@ Inside LeopardScreen locationChanged",
                    "locationChanged");

        }

别忘了添加Menifeast

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET"/>