Android How to - Use location service

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The following code shows how to Use location service.

Example

Register permission

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.examples.service"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="1" />
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".ServiceActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".MyService"></service>
    </application>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
</manifest>

Main layout xml file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <Button
    android:id="@+id/enable"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Start Tracking"
  />
  <Button
    android:id="@+id/disable"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Stop Tracking"
  />
  <TextView
    android:id="@+id/status"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
  />
</LinearLayout>

Main Activity Java code

package com.java2s.myapplication4.app;
//from  ww  w.  j a v  a 2s . c o  m
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.widget.Button;
import android.widget.TextView;
import android.view.View;

public class MainActivity extends Activity implements View.OnClickListener {

    Button enableButton, disableButton;
    TextView statusView;

    MyService trackerService;
    Intent serviceIntent;

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

        enableButton = (Button)findViewById(R.id.enable);
        enableButton.setOnClickListener(this);
        disableButton = (Button)findViewById(R.id.disable);
        disableButton.setOnClickListener(this);
        statusView = (TextView)findViewById(R.id.status);

        serviceIntent = new Intent(this, MyService.class);
    }

    @Override
    public void onResume() {
        super.onResume();
        //Starting the service makes it stick, regardless of bindings
        startService(serviceIntent);
        //Bind to the service
        bindService(serviceIntent, serviceConnection, Context.BIND_AUTO_CREATE);
    }

    @Override
    public void onPause() {
        super.onPause();
        if(!trackerService.isTracking()) {
            //Stopping the service let's it die once unbound
            stopService(serviceIntent);
        }
        //Unbind from the service
        unbindService(serviceConnection);
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()) {
            case R.id.enable:
                trackerService.startTracking();
                break;
            case R.id.disable:
                trackerService.stopTracking();
                break;
            default:
                break;
        }
        updateStatus();
    }

    private void updateStatus() {
        if(trackerService.isTracking()) {
            statusView.setText(String.format("Tracking enabled.  %d locations logged.",trackerService.getLocationsCount()));
        } else {
            statusView.setText("Tracking not currently enabled.");
        }
    }

    private ServiceConnection serviceConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {
            trackerService = ((MyService.TrackerBinder)service).getService();
            updateStatus();
        }

        public void onServiceDisconnected(ComponentName className) {
            trackerService = null;
        }
    };
}

Service Java code

import java.util.ArrayList;
//from www  . j  av a  2 s . c  o m
import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service implements LocationListener {

    private static final String LOGTAG = "TrackerService";
    
    private LocationManager manager;
    private ArrayList<Location> storedLocations;
    
    private boolean isTracking = false;
    
    /* Service Setup Methods */
    @Override
    public void onCreate() {
        manager = (LocationManager)getSystemService(LOCATION_SERVICE);
        storedLocations = new ArrayList<Location>();
        Log.i(LOGTAG, "Tracking Service Running...");
    }
    
    public void startTracking() {
        if(!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
            return;
        }
        Toast.makeText(this, "Starting Tracker", Toast.LENGTH_SHORT).show();
        manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30000, 0, this);
        
        isTracking = true;
    }
    
    public void stopTracking() {
        Toast.makeText(this, "Stopping Tracker", Toast.LENGTH_SHORT).show();
        manager.removeUpdates(this);
        isTracking = false;
    }
    
    public boolean isTracking() {
        return isTracking;
    }
    
    @Override
    public void onDestroy() {
        manager.removeUpdates(this);
        Log.i(LOGTAG, "Tracking Service Stopped...");
    }
    
    /* Service Access Methods */
    public class TrackerBinder extends Binder {
        MyService getService() {
            return MyService.this;
        }
    }
    
    private final IBinder binder = new TrackerBinder();
    
    @Override
    public IBinder onBind(Intent intent) {
        return binder;
    }
    
    public int getLocationsCount() {
        return storedLocations.size();
    }
    
    public ArrayList<Location> getLocations() {
        return storedLocations;
    }
    
    /* LocationListener Methods */
    @Override
    public void onLocationChanged(Location location) {
        Log.i("TrackerService", "Adding new location");
        storedLocations.add(location);
    }

    @Override
    public void onProviderDisabled(String provider) { }

    @Override
    public void onProviderEnabled(String provider) { }

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

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