Application not run in the background

[pramod.deore]

Hello everybody, In my application I want to send sms, but the application must have to run in the background. It send the sms but it is not run in the background. I have following code.

//Background.java

package com.micro;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class Background extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        startService(new Intent(this, MyService.class));
    }
}

My Service class look like this

//MyService.java

package com.micro;

import android.app.Activity;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.telephony.gsm.SmsManager;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service
{
		@Override
		public IBinder onBind(Intent intent)
		{
			return null;
		}
		
		@Override
		public void onCreate()
		{
			sendSMS("9960510915","Pramod Deore");
		
		}
	  
		@Override
		public void onDestroy()
		{
		
		}
		
		@Override
		public void onStart(Intent intent, int startid)
		{
		
		}
		
		 public  void sendSMS(String phoneNumber, String message)
		    {        
		        String SENT = "SMS_SENT";
		        String DELIVERED = "SMS_DELIVERED";
		 
		        PendingIntent sentPI = PendingIntent.getBroadcast(this, 0,new Intent(SENT), 0);
		 
		        PendingIntent deliveredPI = PendingIntent.getBroadcast(this, 0,new Intent(DELIVERED), 0);
		 
		        //---when the SMS has been sent---
		        registerReceiver(new BroadcastReceiver(){
		           
		            public void onReceive(Context arg0, Intent arg1)
		            {
		                switch (getResultCode())
		                {
		                    case Activity.RESULT_OK:
		                        //Toast.makeText(getBaseContext(), "SMS sent",Toast.LENGTH_SHORT).show();
		                        break;
		                    case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
		                        //Toast.makeText(getBaseContext(), "Generic failure",Toast.LENGTH_SHORT).show();
		                        break;
		                    case SmsManager.RESULT_ERROR_NO_SERVICE:
		                        //Toast.makeText(getBaseContext(), "No service",Toast.LENGTH_SHORT).show();
		                        break;
		                    case SmsManager.RESULT_ERROR_NULL_PDU:
		                        //Toast.makeText(getBaseContext(), "Null PDU",Toast.LENGTH_SHORT).show();
		                        break;
		                    case SmsManager.RESULT_ERROR_RADIO_OFF:
		                        //Toast.makeText(getBaseContext(), "Radio off",Toast.LENGTH_SHORT).show();
		                        break;
		                }
		            }
		        }, new IntentFilter(SENT)); 
		 
		        //---when the SMS has been delivered---
		        registerReceiver(new BroadcastReceiver()
		        {
		                public void onReceive(Context arg0, Intent arg1)
		                {
		                	switch (getResultCode())
		                	{
		                    	case Activity.RESULT_OK:
		                        Toast.makeText(getBaseContext(), "SMS delivered",Toast.LENGTH_SHORT).show();
		                        break;
		                    	case Activity.RESULT_CANCELED:
		                        Toast.makeText(getBaseContext(), "SMS not delivered",Toast.LENGTH_SHORT).show();
		                        break;                        
		                	}
		                }
		        },new IntentFilter(DELIVERED));        
		 
		        SmsManager sms = SmsManager.getDefault();
		        sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI);        
		    }
		  
		    	
	}

//AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.micro"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Background"
                  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:enabled="true" android:name=".MyService" />

    </application>
    <uses-sdk android:minSdkVersion="3" />
    
     <uses-permission android:name="android.permission.SEND_SMS">
    </uses-permission>
    
    <uses-permission android:name="android.permission.RECEIVE_SMS">
    </uses-permission>

</manifest>

But when I run it It is not running in the background.

Thanks