Android example to execute threads with ExecutorService

ExecutorService is an Executor that provides methods to manage termination and methods that can produce a Future for tracking progress of one or more asynchronous tasks. This example implement 5 threads to update ProgressBars in background thread. The threads executed by a ExecutorService, with thread pool of 2. Such that only 2 thread is running at any time.

package com.example.androidcountdownprogressbar;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends ActionBarActivity {
 
 Button buttonStart;
 ProgressBar progressBar1, progressBar2,
  progressBar3, progressBar4, progressBar5;
 
 CountThread countThread1, countThread2,
  countThread3, countThread4, countThread5;
 
 ExecutorService executorService = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        buttonStart = (Button)findViewById(R.id.start);
        progressBar1 = (ProgressBar)findViewById(R.id.progressbar1);
        progressBar2 = (ProgressBar)findViewById(R.id.progressbar2);
        progressBar3 = (ProgressBar)findViewById(R.id.progressbar3);
        progressBar4 = (ProgressBar)findViewById(R.id.progressbar4);
        progressBar5 = (ProgressBar)findViewById(R.id.progressbar5);

        buttonStart.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    countThread1 = new CountThread(progressBar1);
    countThread2 = new CountThread(progressBar2);
    countThread3 = new CountThread(progressBar3);
    countThread4 = new CountThread(progressBar4);
    countThread5 = new CountThread(progressBar5);
    
    executorService = Executors.newFixedThreadPool(2);
    executorService.execute(countThread1);
    executorService.execute(countThread2);
    executorService.execute(countThread3);
    executorService.execute(countThread4);
    executorService.execute(countThread5);
   }});
        
    }
    
    public class CountThread extends Thread{
     
     ProgressBar progressBar;
     final int MAX_PROGRESS = 10;
     int progress;
     
     CountThread(ProgressBar progressBar){
      this.progressBar = progressBar;
      progress = MAX_PROGRESS;
     }

  @Override
  public void run() {
   
   for(int i=0; i<MAX_PROGRESS; i++){
    progress--;
    MainActivity.this.runOnUiThread(new Runnable(){

     @Override
     public void run() {
      progressBar.setProgress(progress);
     }});
    
    try {
     Thread.sleep(1000);
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   
  }
    }

}

<LinearLayout 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:orientation="vertical"
    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="com.example.androidcountdownprogressbar.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="android-coding.blogspot.com" />

    <ProgressBar
        android:id="@+id/progressbar1"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="10"
        android:progress="0" />
    <ProgressBar
        android:id="@+id/progressbar2"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="10"
        android:progress="0" />
    <ProgressBar
        android:id="@+id/progressbar3"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="10"
        android:progress="0" />
    <ProgressBar
        android:id="@+id/progressbar4"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="10"
        android:progress="0" />
    <ProgressBar
        android:id="@+id/progressbar5"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="10"
        android:progress="0" />
    <Button
        android:id="@+id/start"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Start" />

</LinearLayout>