how to create wallpaperService in android?

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Mobile

Android

MainActivity.java

package com.nitin.wallpaperalarm;

import java.util.Calendar;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
 

public class MainActivity extends Activity {
	 @Override
	    public void onCreate(Bundle savedInstanceState) {
	        super.onCreate(savedInstanceState);
	            this.requestWindowFeature(Window.FEATURE_NO_TITLE);
	       setContentView(R.layout.main);
	 }
	 
	       public void setWallpaper(View v) {
	    	  
			 Calendar calendar = Calendar.getInstance();
			 //set alarm 7am
	           if (calendar.get(Calendar.HOUR_OF_DAY) >=7) {
	               
	           
	           //calendar.set(Calendar.HOUR_OF_DAY, 7);
	           //calendar.set(Calendar.MINUTE, 00);
	           //calendar.set(Calendar.SECOND, 00);

	           // PendingIntent that will perform a broadcast
	           Intent i1 = new Intent(this,MyAlarmService.class);
		        PendingIntent pi1 = PendingIntent.getActivity(this,
		            12345, i1, PendingIntent.FLAG_CANCEL_CURRENT);
	           // Retrieve an AlarmManager to set a repeating daily alarm
	           ((AlarmManager)getSystemService("alarm")).setRepeating(1,calendar.getTimeInMillis(), 1000,pi1);
	           }
	           //alarm at 10am
	           if(calendar.get(Calendar.HOUR_OF_DAY)>=10){
	        	  // calendar.add(10,1);
	        	   
	        	   Intent i2=new Intent(this,MyAlaramService2.class);
	        	   PendingIntent pi2=PendingIntent.getActivity(this,22341,i2,PendingIntent.FLAG_CANCEL_CURRENT);
	        	   ((AlarmManager)getSystemService("alarm")).setRepeating(1,calendar.getTimeInMillis(),1000,pi2);
	        	   
	           }
	           //set alarm at change image 1pm
	           if(calendar.get(Calendar.HOUR_OF_DAY)>=13){
		        	  // calendar.add(10,1);
		        	   calendar.set(Calendar.HOUR_OF_DAY,13);
		        	   calendar.set(Calendar.MINUTE,00);
		        	   calendar.set(Calendar.SECOND,00);
		        	   Intent i3=new Intent(this,MyAlarmService3.class);
		        	   PendingIntent pi3=PendingIntent.getActivity(this,12345,i3,PendingIntent.FLAG_CANCEL_CURRENT);
		        	   ((AlarmManager)getSystemService("alarm")).setRepeating(1,calendar.getTimeInMillis(),1000,pi3);
		        	   
		           }
	           //set alarm at change 5pm
	           if(calendar.get(Calendar.HOUR_OF_DAY)>=5){
		        	  // calendar.add(10,1);
		        	   calendar.set(Calendar.HOUR_OF_DAY,5);
		        	   calendar.set(Calendar.MINUTE,00);
		        	   calendar.set(Calendar.SECOND,00);
		        	   Intent i4=new Intent(this,MyAlaramService2.class);
		        	   PendingIntent pi4=PendingIntent.getActivity(this,23456,i4,PendingIntent.FLAG_CANCEL_CURRENT);
		        	   ((AlarmManager)getSystemService("alarm")).setRepeating(1,calendar.getTimeInMillis(),1000,pi4);
		        	   
		           }//if close
	          
	       }//method close
	    }

this code for create alarm and I need to code help for create Wallpaper service.. plese any one can i help me...

thank You in advance