GPS and Network Location

jbrohan · by **jbrohan** » Mon Aug 02, 2010 3:01 pm

This tutorial shows how to get the Longitude and Latitude coordinates from the Android GPS system, and also from the Networkl Locationm using the broadcasting towers.. It uses the DDMS debugger system to display results (This is a page in the Eclipse or a separate program run from a command prompt in Windows). For simplicity and clarity there is no front panel and extraneous code is kept to a minimum. Note the uses-permission in the Android Manifest

The LocationManager lm and the LocationListener locationListener are declared in the Activity at lines 16-17
The locationListener is linked to the GPS_PROVIDER and the NETWORK_PROVIDER with a period and a range of movement. lines 27 to 37.

onLocationChanged calls the private function getGPS().

getGPS() gets a list of the location providers, and then loops through them displaying some information about them.

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Using java Syntax Highlighting

package com.example.location;
 
import java.util.List;
 
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
 
public class LocationServices extends Activity {
   
        
        LocationManager lm;
        private LocationListener locationListener;
        
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        lm=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
        locationListener = new MyLocationListener();
        
        lm.requestLocationUpdates(
                LocationManager.GPS_PROVIDER, 
                3000,           // ms since last call
                0,              //  m movement
                locationListener);     
        lm.requestLocationUpdates(
                LocationManager.NETWORK_PROVIDER, 
                200,            // ms since last call
                0,              //  m movement
                locationListener);  
        
    }
    
    public class MyLocationListener implements LocationListener 
    {
        public void onLocationChanged(Location loc) {  
                double coordinates[] = getGPS();                
        }
        
            public void onProviderDisabled(String provider) {
                // TODO Auto-generated method stub
            }
        
            public void onProviderEnabled(String provider) {
                // TODO Auto-generated method stub
                Log.d("Hello7","onProviderEnabled");
            }   
            public void onStatusChanged(String provider, int status, Bundle extras) {
            }
    }
    onLocationChanged calls getGPS()
    private double[] getGPS() {
        
        List<String> providers = lm.getProviders(true);
        double[] gps = new double[2];
        /* Loop over the array backwards, and if you get an accurate location, then break out the loop*/
        Location l = null;
        
        for (int i=providers.size()-1; i>=0; i--) {
                String s = providers.get(i);
                Log.d("LocServ",String.format("provider (%d) is %s",i,s));
                l = lm.getLastKnownLocation(providers.get(i));  
                if (l != null) {
                        gps[0] = l.getLatitude();
                        gps[1] = l.getLongitude();
                        Log.d("LocServ",String.format("Lat %f, Long %f accuracy=%f",gps[0],gps[1],l.getAccuracy()));
                }       
        }
        return gps;
    }
}
Parsed in 0.040 seconds,  using GeSHi 1.0.8.4

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Using xml Syntax Highlighting

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.location"
      android:versionCode="1"
      android:versionName="1.0">
      <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
      <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".LocationServices"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
 
    </application>
    <uses-sdk android:minSdkVersion="3" />
 
</manifest> 
Parsed in 0.004 seconds,  using GeSHi 1.0.8.4

jbrohan · by **jbrohan** » Wed Aug 04, 2010 8:52 pm

error line 57 should be acomment!!! sorry

GPS and Network Location

GPS and Network Location

Re: GPS and Network Location

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