Android

Android Location Example with source code
Author : Ishtek

Setup Eclipse with Android ADT Plugin for test/code environment (by using Android API Level 7 and Emulator).
P.S- Above page is having around 14 images, download size could be around 700KB.

This Page and/or example code is using Android API Level 7 and tested using corresponding Emulator only.
For latest information please refer Android Official website.

Using Android API Level : 7
When it comes to try out location specific features, those are available
in any Android based Mobile device. In this page we will go through a very
simple (at least I think so) example. In this example there a single activity
that uses LocationManager and Geocoder class from Android API from Android Platform.

This example's Main Activity is having some TextView to show longitude, latitude,
and address lines available/ supported in the mobile devices.


This example code: LocationSample.java
package demo.example.locationexample;

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

import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.widget.TextView;
import android.widget.Toast;

public class LocationSample extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_location_sample);
        LocationManager locMgr = (LocationManager) getApplicationContext()
                                                          .getSystemService(LOCATION_SERVICE);
        if(locMgr != null) {
            
            Location location = locMgr.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            if(location != null) {
                TextView txtLong = (TextView) findViewById(R.id.my_loc_longitude);
                double longitude = location.getLongitude();
                txtLong.setText(longitude+"");
                TextView txtLatitude = (TextView) findViewById(R.id.my_loc_latitude);
                double latitude = location.getLatitude();
                txtLatitude.setText(latitude+"");
                Geocoder geoCoder = new Geocoder(this, Locale.getDefault());
                try {
                    List<Address> myAddressList= geoCoder.getFromLocation(latitude, longitude, 1);
                    if(myAddressList.isEmpty()) {
                        Toast.makeText(this, "Sorry.. your address is not available", 
                                                                    Toast.LENGTH_LONG).show();
                    } else {
                      Address myAddress = myAddressList.get(0);
                      StringBuffer addrSB = new StringBuffer();
                      addrSB.append("Country : ");
                      addrSB.append(myAddress.getCountryName()+"\r\n");
                      int lines = myAddress.getMaxAddressLineIndex();
                      for(int i=0;i<lines;i++) {
                          addrSB.append(myAddress.getAddressLine(i)+"\r\n");
                      }
                      TextView txtAddress = (TextView) findViewById(R.id.my_address_info);
                      txtAddress.setText(addrSB);
                    }
                    
                } catch (IOException e) {
                    Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
                }
            } else {
                Toast.makeText(this, "Sorry.. your location is not available", 
                                                                    Toast.LENGTH_LONG).show();    
            }
        } else {
          Toast.makeText(this, "Sorry.. this program will not run in your device", 
                                                                    Toast.LENGTH_LONG).show();    
        }
        
    }

}

While designing screen for this example, I have used LinearLayout and TextView for
displaying longitude, latitude, address of the default locale of the Mobile device
location.
activity_location_sample.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" 
    android:orientation="vertical" >
 
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#00FF00"
        android:text="@string/txt_longitude"
        android:textColor="#000000"
        android:textStyle="bold" />

    <TextView android:id="@+id/my_loc_longitude"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content">
        
    </TextView>
    <TextView android:text="@string/txt_latitude"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:background="#00FF00"
              android:textColor="#000000"
              android:textStyle="bold"/>
    
    <TextView android:id="@+id/my_loc_latitude"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"/>

    <TextView android:text="@string/txt_myaddress"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:background="#00FF00"
              android:textColor="#000000"
              android:textStyle="bold"/>
    
    <TextView android:id="@+id/my_address_info"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"/>
    
  </LinearLayout>

Few text values used in this example, are listed below:
string.xml
<resources>
    <string name="app_name">LocationExample</string>
    <string name="title_activity_location_sample">LocationSample</string>
    <string name="txt_longitude">My Location Longitude</string>
    <string name="txt_latitude">My Location Latitude</string>
    <string name="txt_myaddress">My Address Information:</string>
</resources>
But when I ran this example in emulator, it shows a screen as follows:



When this same example is ported to an actual device on Android Platform, 
longitude , latitude and address lines are seen on mobile device screen.

One can extend this example to include LocationListener feature as well,
this way any change in location, would fire onLocationChanged method,
and corresponding longitude and latitude values are shown on text view.

Changes in this example Activity by implementing LocationListener interface,
and implementing corresponding methods from LocationListener.
    public void onLocationChanged(Location location) {
        if(location != null) {
            txtLong.setText(location.getLongitude()+"");
            txtLatitude.setText(location.getLatitude()+"");
        }
        
    }
Many other possibilities can be explored in this interesting aspect of GPS
location specific providers from Android Platform.
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