extends IntentService to create your own service

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.java2s.myapplication3.app" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="java2s.com"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.java2s.myapplication3.app.MainActivity"
            android:label="java2s.com" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>


        <service android:name="com.java2s.myapplication3.app.MyService" />
    </application>

</manifest>

<?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"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

package com.java2s.myapplication3.app;
//  w  ww .java  2s  .co m
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        logEvent("CREATE");
    }

    @Override
    public void onStart() {
        super.onStart();
        logEvent("START");
    }

    @Override
    public void onResume() {
        super.onResume();
        logEvent("RESUME");
    }

    @Override
    public void onPause() {
        super.onPause();
        logWarning("PAUSE");
    }

    @Override
    public void onStop() {
        super.onStop();
        logWarning("STOP");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        logWarning("DESTROY");
    }

    private void logEvent(String event) {
        Intent intent = new Intent(this, MyService.class);
        intent.setAction(MyService.ACTION_EVENT);
        intent.putExtra(MyService.EXTRA_NAME, event);

        startService(intent);
    }

    private void logWarning(String event) {
        Intent intent = new Intent(this, MyService.class);
        intent.setAction(MyService.ACTION_WARNING);
        intent.putExtra(MyService.EXTRA_NAME, event);

        startService(intent);
    }
}

package com.java2s.myapplication3.app;
//  w w w.  j av  a2  s  . c  om
import android.app.IntentService;
import android.content.Intent;
import android.content.IntentFilter;
import android.text.TextUtils;
import android.util.Log;
import android.widget.Toast;

public class MyService extends IntentService {

    public static final String ACTION_EVENT = "ACTION_EVENT";
    public static final String ACTION_WARNING = "ACTION_WARNING";
    public static final String ACTION_ERROR = "ACTION_ERROR";
    public static final String EXTRA_NAME = "eventName";

    private static final String LOGTAG = "EventLogger";

    private IntentFilter matcher;

    public MyService() {
        super("OperationsManager");
        matcher = new IntentFilter();
        matcher.addAction(ACTION_EVENT);
        matcher.addAction(ACTION_WARNING);
        matcher.addAction(ACTION_ERROR);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        //Check for a valid request
        if(!matcher.matchAction(intent.getAction())) {
            Toast.makeText(this, "OperationsManager: Invalid Request", Toast.LENGTH_SHORT).show();
            return;
        }

        if(TextUtils.equals(intent.getAction(), ACTION_EVENT)) {
            logEvent(intent.getStringExtra(EXTRA_NAME));
        }
        if(TextUtils.equals(intent.getAction(), ACTION_WARNING)) {
            logWarning(intent.getStringExtra(EXTRA_NAME));
        }
        if(TextUtils.equals(intent.getAction(), ACTION_ERROR)) {
            logError(intent.getStringExtra(EXTRA_NAME));
        }
    }

    private void logEvent(String name) {
        try {
            //Simulate a long network operation by sleeping
            Thread.sleep(5000);
            Log.i(LOGTAG, name);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    private void logWarning(String name) {
        try {
            //Simulate a long network operation by sleeping
            Thread.sleep(5000);
            Log.w(LOGTAG, name);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    private void logError(String name) {
        try {
            //Simulate a long network operation by sleeping
            Thread.sleep(5000);
            Log.e(LOGTAG, name);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}