This file demonstrates how to start activity from service

MyService.java

package com.test;

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 TAG = "MyService";
	public static boolean RUNNING = false;
	
	@Override
	public IBinder onBind(Intent intent) {
		
		return null;
	}
	
	@Override
	public void onCreate() {
		
		Toast.makeText(this, "My Service Created", Toast.LENGTH_LONG).show();
		Log.d(TAG, "onCreate");
		
		RUNNING = true;
		
		new Thread(){public void run(){
			
			try{
				
				Thread.sleep(5000);
				
				Intent i = new Intent(MyService.this, UpdateDBProgressDialog.class);
				i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
				MyService.this.startActivity(i);
				
				
			}catch(Exception e){e.printStackTrace();}
			
		}}.start();
		
	}

	@Override
	public void onDestroy() {
		Toast.makeText(this, "My Service Stopped", Toast.LENGTH_LONG).show();
		Log.d(TAG, "onDestroy");
		RUNNING = false;
	}
	
	@Override
	public void onStart(Intent intent, int startid) {
		Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
		Log.d(TAG, "onStart");
	}
}