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Here is source code of the Program to Start a Service in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

Unlike Activities, which display graphical interfaces, Services run invisibly — doing Internet lookups, processing data, updating your Content Providers, firing Intents, and triggering Notifications. While Activities are started, stopped, and re-created regularly as part of their lifecycle, Services are designed to be longer-lived — specifically, to perform ongoing and potentially time-consuming operations.
Services are started, stopped, and controlled from other application components, including Activities, Broadcast Receivers, and other Services. If your application provides functionality that doesn’t depend directly on user input, or includes time-consuming operations, Services may be the answer.

MainActivity.java

package com.example.creating_service;
 
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button start = (Button) findViewById(R.id.startService);
        start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startService(new Intent(MainActivity.this, MyService.class));
            }
        });
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

MyService.java

package com.example.creating_service;
 
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
 
public class MyService extends Service {
 
    private static final String var = "MyService";
 
    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
 
    @Override
    public void onCreate() {
        Toast.makeText(this, " MyService Created ", Toast.LENGTH_LONG).show();
        Log.d(var, "onCreate");
    }
 
    @Override
    public void onStart(Intent intent, int startId) {
        Toast.makeText(this, " MyService Started", Toast.LENGTH_LONG).show();
        Log.d(var, "onStart");
        // Note: You can start a new thread and use it for long background
        // processing from here.
    }
 
}

Activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
    <Button
        android:id="@+id/startService"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:text="Start Service " />
 
</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.creating_service"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.creating_service.MainActivity"
            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"
            android:enabled="true" />
    </application>
 
</manifest>

Java Android Program to Start a Service in Android