Sep 27, 2017

Free game graphics and audio resources

Sep 26, 2017

CommandInvokationFailure: Failed to sign APK package.

1. First, make sure that you have selected "Development Build"
2. If first solution is not working, uninstall all Java related jdk and download and install a new one and give jdk path on unity.

Sep 24, 2017

Creating Key Store on Unity

Sep 23, 2017

Setting Android on Windows on with Unity 2017.1.1f1

My settings
OS: Windows 10
Unity Version: 2017.1.1f1
JDK Verison: Jdk-9
Android Studio: Version 2.3.3
Androi SDK:

1. Set Java Path for computer. (Computer->Properties->Advanced system settings->Environment Variables)

* System Variable
Variable Name : PATH
Variable Value : C:\Program Files\Java\jdk-9\bin

But the best practice is to set JAVA_HOME and PATH as follow.

* User Variable
Variable Name : JAVA_HOME
Variable Value : C:\Program Files\Java\jdk-9

* System Variable
Variable Name : PATH
Variable Value : %JAVA_HOME%\bin

Possible Error Solution:

2. Download Android Stuio or SDK from

3. Install it, make sure that you select tools and SDK (if you are installing Androi Studio.)

4. Then launch Android Studio and finish installation by downloading sdk.

5. From Android Studio, Install services and NDK. And make SDK udates.

6. Your sdk path : C:\Users\UserName\AppData\Local\Android\sdk

5. irst I tried installing Android SDK and an older Version of JDK into folders with only three letters in the folder name directly on the desktop. But this was not the solution.

Then I fixed it by downgrading the android sdk tool version. Obviously the most current version (SDK Tools, Revision 25.3.0 (March 2017)) causes the trouble.

This is how you do it:

    Go to your Android SDK Folder. (If you did not change the path during Android Studio installation you will find the SDK folder here: C:\Users\YourUsername\AppData\Local\Android\sdk )

    Rename the old Android sdk "Tool" folder : [Your Android SDK root]/tools -> toolsXXXX

    Download Android SDK Tools, Revision 25.2.5 (January 2017):

    Extract that to Android SDK root folder.

    In Unity go to Edit>Preferences>External Tools and check again, that the path for Android SDK points to the correct folder. (The correct path is the SDK root folder, not the tools folder which is inside the root folder!)

    Build your project.

Java Path Environmental Settings in Windows 10

Just set the path variable to JDK bin in environment variables.
Variable Name : PATH 
Variable Value : C:\Program Files\Java\jdk1.8.0_31\bin
But the best practice is to set JAVA_HOME and PATH as follow.
Variable Name : JAVA_HOME
Variable Value : C:\Program Files\Java\jdk1.8.0_31

Variable Name : PATH 
Variable Value : %JAVA_HOME%\bin

Sep 13, 2017


Some useful websites for programmers.

When learning CS there are some useful sites you must know to get always informed in order to do your technologies eve and learn new things. Here is a non exhaustive list of some sites you should visit, this list will get updated as soon as I can get another link, but you can also contribute by adding those you know 😉


When you get stuck

  • Codementor : A mentorship community to learn from fellow developers via live 1:1 help and more.
  • devRant : Community where you can rant and release your stress
  • Learn Anything : Community curated knowledge graph of best paths for learning anything
  • Quora : A place to share knowledge and better understand the world
  • Stack Overflow : subscribe to their weekly newsletter and any other topic which you find interesting


  • ACM TechNews : TechNews
  • Stratechery : Stratechery by Ben Thompson
  • AlternativeTo : Crowdsourced software recommendations
  • Ars Technica : posts unique quality articles
  • Better Dev Links : Weekly links to help you become a better developer
  • DevOpsLinks : An online community of thousands of developers and IT experts interested in DevOps
  • : news related to latest mobile phones and android.
  • Hacker News Digest : curated automatically, delivered as frequently as you want
  • Hacker News : news aggregator for programmers where civility is king, try a newsletter to get top news to your inbox:
  • Hacker Newsletter : curated by hand, delivered weekly
  • High Scalability : Success stories of various companies on their apps, infra scaling.
  • Lobsters : Lobsters is a technology-focused community centered around link aggregation and discussion.
  • product hunt : Discover your next favorite thing
  • Recode : Tech news that focuses on the business of Silicon Valley
  • : Subreddit with aggregated tech news and articles
  • Slashdot : News, Social news (Originally "News for Nerds. Stuff that Matters")
  • Stack Share : Technical stack sharing site for various companies
  • TechCrunch : dedicated to obsessively profiling startups, reviewing new Internet products, and breaking tech news
  • The Verge : More product oriented tech news
  • XDA : Android Developers News


  • MIT Technology Review : MIT's tech review magazine.
  • Nautilus : NewYorker for tech.
  • LWN : Weekly news coverage of opensource technologies, programming, etc. ( Originally Linux Weekly News).

Coding practice for beginners

  • Cave of programming : Learn to program, Upgrade your skills.
  • Codeacademy : Learn to code interactively, for free.
  • CodeAbbey - a place where everyone can master programming : Best place to begin with problems that start at the easiest and gradually increase difficulty with each problem.
  • : download and solve practice problems in over 30 different languages, and share your solution with others.
  • freeCodeCamp : Learn to code and build projects for nonprofits. Build your full stack web development portfolio today
  • karan/Projects-Solutions : Solutions to most of the problems in the link above
  • Lod - Cloud : The Linking Open Data cloud diagram
  • Programming by Doing : very good site for those who want to start with absolute basics
  • : interesting programming challenges where you can learn from looking at other's code , even if you are not able to solve code you can look at how others solved.
  • People Can Program : The most user-friendly code learning application on the internet.
  • Programming Tasks : large collection of small programs
  • Vim adventures : Learn VIM by playing
  • Pramp : It's your turn to be the interviewer. when done, click on the swap roles button on the left
  • Paqmind : Guides and challenges to learn programming

For those who want to start a small project but can't find the ideas

General Coding advice

Coding Style

General Tools

  • CodePad : Quickly Conduct Coding Interviews and Phone Screen Interviews.
  • CodePen : Front End Developer Playground & Code Editor in the Browser
  • Devicons : Cheatsheet for devs icons
  • regex101 : Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript
  • regexr : Another online tool to learn, build & test Regular Expressions
  • Wit AI : Natural Language for Developers

Bash and Shell scripting

Interview Preparation


MOOCs for learning something new

Sites related to your preferred programming language (For me Java)

Learn AI

Seminar , research writing , talks etc

Everything in one place

YouTube Channels

Good Articles


  • Coding Blocks : A podcast covering topics such as best programming practices, design patterns, coding for performance, object oriented coding, database design and implementation, tips, tricks and a whole lot of other things.
  • Developer On Fire : A podcast that shares the humanity of developers and tells stories of some of the amazing people in software, hosted by Dave Rael.
  • Developer Tea : A podcast for developers designed to fit inside your tea break.
  • Front End Happy Hour : A podcast featuring a panel of Software Engineers from Netflix, Evernote, Atlassian & LinkedIn talking over drinks about all things Front End development.
  • Full Stack Radio : Everything from product design and user experience to unit testing and system administration.
  • Groovy Podcast : A podcast dedicated to the Groovy programming language and its ecosystem.
  • IPhreaks : A weekly group discussion about iOS development and related technology by development veterans. We discuss Apple, tools, practices, and code.
  • JavaScript Jabber : A weekly discussion about JavaScript, front-end development, community, careers, and frameworks.
  • MS Dev Show : Jason Young and Carl Schweitzer talk about the latest in developer news covering topics such as the Azure cloud, Windows, Windows Phone, Visual Studio, and cross-platform development using the Microsoft platform.
  • React Native Radio : A weekly discussion of the tools, techniques, and technologies used to build mobile applications with JavaScript and React.
  • Software Engineering Daily : A daily technical interview about software topics.
  • Software Engineering Radio : A podcast targeted at the professional software developer. The goal is to be a lasting educational resource, not a newscast.
  • Syntax : A Tasty Treats Podcast for Web Developers by Wes Bos & Scott Tolinski.
  • The Bike Shed : Guests discuss their development experience and challenges with Ruby, Rails, JavaScript, and others.
  • The Changelog : A weekly conversation that gets to the heart of open source technologies and the people who create them.
  • The Cynical Developer : A podcast that aims to help you to improve your development knowledge and career, through explaining the latest and greatest in development technology and providing you with what you need to succeed as a developer. Covering Desktop, web and mobile development, mainly around the .Net Stack but often looking into other software and frameworks.

Building a Simple Compiler/Interpreter


Watch others code

  • : screencast of people building application, websites, games, etc.
  • : The programming community of twitch.

What should a programmer know

Competitive programming

Computer Books

Video Tutorials

Online Compiler and Sharing Code snippets

  • CodePad : Code editor to try, test and run 25+ languages
  • : CodeSandbox makes it easier to create, share and reuse React projects with others.
  • : Excellent tool for exploring the assembly output of different compilers with and without optimization.
  • : online compiler and debugging tool for more than 60 programming languages
  • JSFiddle : Test your JavaScript, CSS, HTML or CoffeeScript with online code editor
  • : Your development environment, in the cloud
  • Github Gist : Instantly share code, notes, and snippets.

Blogs of Developers

For improving your English

When you get bored from CS related stuff

Open Source Websites

  • Open Hatch : OpenHatch is a non-profit dedicated to matching prospective free software contributors with communities, tools, and education.
  • Source Forge : SourceForge hosts nearly 280,000 projects (at last count). It serves more than 2 million downloads a day and includes apps and tools in a wide variety of categories.
  • Google Code : Google offers free hosting for open source projects using the Subversion or Mercurial version control systems. It offers 2 GB of storage, integrated code review tools, a wiki, and an issue tracker. The Google Code site also provides links to Google's many publicly available APIs and other developer tools.
  • Launch Pad : Maintained by Canonical, LaunchPad is particularly targeted at projects that run on Ubuntu. It provides hosting for more than 21,000 projects that use the Bazaar version control system.
  • Google Open Source : Google Open Source
  • Red Hat Developer : The world's leading provider of open source solutions
  • Open Source : Open Source
  • Google Summer of Code : Google Summer of Code is a global program focused on bringing more student developers into open source software development. Students work with an open source organization on a 3 month programming project during their break from school.
  • Open Source Web Design : Open Source Web Design is a platform for sharing standards-compliant free web design templates. We give web publishers a voice through good design.
  • Mozilla Winter of Security : The Winter of Security (MWOS) is a program organized by Mozilla's Security teams to involve students with Security projects. Students who have to perform a semester project as part of their university curriculum can apply to one of the MWOS project.
  • Eclipse Lab : Eclipse Labs is a community of open source projects that build technology based on the Eclipse platform. It provides the infrastructure services typically required by open source projects, such as code repositories, bug tracking, project web sites/wiki. Eclipse Labs is hosted by Google Code Project Hosting, so it will be very familiar to developers already using Google Code Project Hosting.
  • Bit Bucket : Like GitHub, BitBucket hosts both public and private projects. On this site, open source projects and private projects with fewer than five users are free. It hosts more than 48,000 repositories, many of which are searchable on the site.
  • Media Wiki : MediaWiki is a free software open source wiki package written in PHP, originally for use on Wikipedia. It is now also used by several other projects of the non-profit Wikimedia Foundation and by many other wikis, including this website, the home of MediaWiki.