Question

我尝试过以下代码，但没有获取当前位置当我在模拟器控件上手动设置位置然后我得到这样的位置但没有获得当前位置。我得到零位置。

如何获取当前位置？
有没有其他方法可以获取当前位置？

这是我的代码：

package com.p;
import android.app.Activity;
import android.os.Bundle;

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

import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
    public class GooglemapActivity extends Activity implements LocationListener {
   private TextView latituteField;
   private TextView longitudeField;
    private LocationManager locationManager;
    private String provider;
        EditText t;
   @Override
   public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
        setContentView(R.layout.main);



        latituteField = (TextView) findViewById(R.id.TextView02);
        longitudeField = (TextView) findViewById(R.id.TextView04);

        // Get the location manager
     locationManager =                  (LocationManager)getSystemService(Context.LOCATION_SERVICE);



    // Define the criteria how to select the locatioin provider -> use
    // default

            Criteria criteria = new Criteria();
           criteria.setAccuracy(Criteria.ACCURACY_FINE);
           criteria.setAltitudeRequired(false);//true if required
           criteria.setBearingRequired(false);//true if required
           criteria.setCostAllowed(true);
            criteria.setPowerRequirement(Criteria.POWER_LOW);
            provider = locationManager.getBestProvider(criteria, true);
            //provider=LocationManager.GPS_PROVIDER;
        Location location = locationManager.getLastKnownLocation(provider);
                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
             /*check provder*/boolean statusOfGPS    =locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);


            if ( statusOfGPS==true) {
        // Initialize the location fields
        if (location != null) {
               System.out.println("Provider " + provider + " has been      selected.");
                   double lat = (double) (location.getLatitude());
                    double lng = (double) (location.getLongitude());
                   latituteField.setText(Double.toString(lat));
                    longitudeField.setText(Double.toString(lng));
                } else {
                      latituteField.setText("Provider is not available");
                      longitudeField.setText("Provider not available");
                }


        }
        else
        {

        latituteField.setText("eeeeeeeee");
        longitudeField.setText("rrrrrrrrr");

        }
    }

    /* Request updates at startup */
    @Override
    protected void onResume() {
        super.onResume();
    locationManager.requestLocationUpdates(provider, 400, 1, this);
    }

    /* Remove the locationlistener updates when Activity is paused */
    @Override
    protected void onPause() {
        super.onPause();
    locationManager.removeUpdates(this);
    }

    public void onLocationChanged(Location location) {
            double lat = (double) (location.getLatitude());
         double lng = (double) (location.getLongitude());
        latituteField.setText(Double.toString(lat));
        longitudeField.setText(Double.toString(lng));
    }

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

    }

    public void onProviderEnabled(String provider) {
        Toast.makeText(this, "Enabled new provider " + provider,
            Toast.LENGTH_SHORT).show();

    }

    public void onProviderDisabled(String provider) {
        Toast.makeText(this, "Disabled provider " + provider,
            Toast.LENGTH_SHORT).show();
    }
     }

我在manifest.xml中添加了如下权限：

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

Answer 1

您将无法在模拟器中获取当前位置。您可以通过DDMS设置它们，如果是模拟器，它们将是您当前的位置。

Answer 2

请不要试图获得最后知名的位置，大部分时间它都是陈旧无用的。请改为设置locationListener并等待位置更新。这将为您提供当前位置。

您可以使用此代码开始列出GPS更新，并对您收到的数据执行某些操作。它还会在日志文件中打印消息以便于调试。请注意，此功能不会返回任何结果，它只会开始收听GPS 。稍后将在// do something here with the new location data部分提供结果，此时您可以将它们保存在某个地方。

private void getGpsData() {
    locationManager = (LocationManager) owner.getSystemService(Context.LOCATION_SERVICE);

    locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            Log.i(TAG, "location change:" + location.toString());

            String longitude = "Londitude: " + location.getLongitude();
            String latitude = "Latitude: " + location.getLatitude();

            if( location.hasAccuracy() ) {  // good enough?
                // do something here with the new location data
                ....
                //
                Log.i(TAG, "GPS listener done");
                locationManager.removeUpdates(this);    // don't forget this to save battery
            }
        }

        public void onStatusChanged(String provider, int status, Bundle extras) {
            Log.i(TAG, provider + " status:" + status);
        }

        public void onProviderEnabled(String provider) {
            Log.i(TAG, provider + " enabled");
        }

        public void onProviderDisabled(String provider) {
            Log.i(TAG, provider + " disabled");
        }
    };
    Log.i(TAG,"GPS listener started");
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener );
}

在android中获取当前位置

2 个答案: