我们如何使用Google融合的位置服务获取我们Android设备的准确位置？

Question

I am requesting location updates in every 15 sec, but each time the location gets changed, even if the device is on the same position.

Can anyone help me on this, to make me know exact location, atleast most approximate location, so that I can Calculate the Distance while traveling, and wait time while standing on the same place for a long time.

Answer 1

you can check the accuracy of the location. This defines how accurate is the location you received, based on that you can filter the locations http://developer.android.com/reference/android/location/Location.html#getAccuracy()

Answer 2

1 Create a layout file named layout_map having a fragment to render map

<?xml version="1.0" encoding="utf-8"?>
<!--
     <com.google.android.gms.maps.MapView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/mapView" />
-->
<!--
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent" >

   <fragment
      android:id="@+id/map"
      android:name="com.google.android.gms.maps.MapFragment"
      android:layout_width="match_parent"
      android:layout_height="match_parent"/>

</RelativeLayout> 
-->

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.MapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

2. Generate the mapkey and add it to in the manifest file

    <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyBYc4fMCweLC4w77_hRctOktAt2bqLmnyg" />
3. Added metatdata tag for googleplay service

  <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />

4. Add the map,internet,corselocation permissions

   <uses-permission android:name="com.smartdurg.fragment.map.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

5. Create an activity named as MapActivtivity

package com.smartcity.bilaspur;

import java.io.IOException;
import java.util.List;
import java.util.Locale;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import com.google.android.gms.maps.model.LatLng;
public class MapActivity extends Activity  {

    String latitude,longitude,address,city,country;
    LatLng defaultLatLng;
    Context context;
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.map_activity);
          try {
              context = this;
        Bundle extras = getIntent().getExtras();
        if (extras != null)
        {   
            latitude = extras.getString("lat");
            longitude = extras.getString("lng");
            Log.e("MAP", "latitude? "+latitude);
            Log.e("MAP", "longitude?"+longitude);
        }   
        defaultLatLng = new LatLng(Double.valueOf(latitude), Double.valueOf(longitude));

         Geocoder geocoder;
             List<Address> addresses ;
             geocoder = new Geocoder(this, Locale.getDefault());

            addresses = geocoder.getFromLocation(Double.valueOf(latitude), Double.valueOf(longitude), 1);

            Log.v("addresses",">>>>>>>>>>>>>>>>"+addresses);
            if (addresses.size()<=0)
            {
                Toast.makeText(this, "InValid Location",2).show();
                finish();
            }
            else
            {
              address = addresses.get(0).getAddressLine(0);
              city = addresses.get(0).getAddressLine(1);
              country = addresses.get(0).getAddressLine(2);
             String geoUri = "http://maps.google.com/maps?q=loc:" + latitude + "," + longitude + " (" + "GOT IT" + ")";

            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(geoUri));
            context.startActivity(intent);
            }
        } 

          catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

In this case I have found the latitude & longitude form the webservice, you can find a code to get exact location from below link also with current latitude & longitude.
http://stackoverflow.com/questions/17519198/how-to-get-the-current-location-latitude-and-longitude-in-android