01 May 2017

    Why local variable not alive outside scope?

    By chance I got a tech question from my feed which was tagged an Software Architect for answer from him, said: Why is a local variable only alive inside its codeblock (between two brackets {} in Java)?


    29 Feb 2016

    Auto Wake Up, Autoplay Favourite Music

    Somedays I remember old days which my father usually opened guitar songs when he woke up while I was sleeping. That was great to hear smooth melody and be woken up by those beautiful rhythm in the morning. That's why I want to auto wake up my Mac and auto play favourite guitar playlist when I'm still sleeping. Then this is how I did.


    12 Jun 2015

    Infer Facebook Demo

    Facebook just opened their analyzing tool for mobile development, primarily focusing on iOS and Android project, called Infer. As Facebook said, A tool to detect bugs in Android and iOS apps before they ship, Infer can analyze and detect much more implicit bugs in a mobile project before sending to users.


    04 Jun 2015

    Pod's problem with UnitTest

    I was in trouble with an error come from Unit Test when I add new Cocoapod library.


    04 Jan 2015

    Writing for the beginning of would be great year

    Heyza, new year came. That's it, it came no doubt there. Something new will come in 2015


    27 Jun 2014

    Weird Behaviour with ViewController

    If you're crazy, and if you're creating your awesome app without storyboard or xib, sometimes you may encounter a case which on iOS 7 your view is shifted to bottom automatically a distance of status bar and navigation bar (64px).


    07 Jan 2014

    Attributed String and the magic of text drawing

    From IOS 6, there is a magical tool to make beautiful and colorful words for any purpose such as representing lovely text to girlfriend/boyfriend or to relations. It is called **Attributed String**. In IOS 7, we can freely to reveal text in our apps with many new supports.


    18 Dec 2013

    Core Graphics - Something should be in mind

    Core Graphics is a really low-level framework in iOS which requires more graphics background knowledge to perform drawing fluently. Because of many built-in functions and options, it is hard to catch and understand all of them. This post attempts to provide some common functions/options for very new Core Graphics Hackers.


    26 Nov 2013

    HUChart be in top new github repo in the released day

    It was really a surprise for me because that day was the first day HUChart goes public.


    25 Nov 2013

    Cocoapods - Easy but not easy

    Someone told that Cocoapods is easy to use at both aspects: integrating open third-party into own project and publishing opensource library to community. However, for a newbie or even an experience developer, at the first time, it is not easy as a pie. This post is for them!


    07 Nov 2013

    Cryptography in iOS - How to protect your precious data?

    Our current project (PDF Subscription service) is in need some urgent tasks relating to protecting data far away from hackers. There are many ways to put data into pocket with multi-levels, especially in iOS. As one of my tasks in the project, I would like to learn more about cryptography and apply into our end-to-end encryption with PDF data, image data and a part of video data. As my normal habit, I noted what I read about.


    28 Oct 2013

    Audio Processing - The second step

    In the previous post at Audio Processing in iOS - an initial step, I had shown you some basic terminologies in audio processing and several libraries to handle with audio in iOS. It is just a kick off! This post, I will provide in more details principle architect of audio (in iOS, certainly!) and give you some great documents to gain more audio knowledge.


    07 Oct 2013

    Understanding PDF in iOS Deeply

    Operating with PDF in iOS is a really low-level task. It is not just using some built-in features of iOS to create your own product. Indeed, it requires intensive knowledge at very low iOS layer and at least basic PDF definitions. This post tends to supply some aspects of processing PDF in iOS which aims to help developers easy to win this hard job.


    28 Sep 2013

    Git and its tutorials

    Nowadays, Git becomes very popular for managing source-code in not only IT Industry but also universities, academies. By this reason, Git is really important for all who want to work faster, smarter and in bigger projects. However, Git is not easy to control if you are not familiar with sourcecode management, even if you used to do with svn, it is still difficult. This post, I list some good tutorials for a wide range of Git's users, from newbie to intermediate to advance guys.


    27 Sep 2013

    Audio Processing in iOS - an initial step

    Performing with audio is always a challenge for any developer by reason of its very low level. By chance, I got some opportunities to do with audio included playing, recording and pre (and/or) post processing. This post tends to cover as much as possible basic knowledge in Audio aspect for two reasons: reminding myself and sharing with other enthusiastic guys.


    25 Sep 2013

    Useful command line on Mac OS/Linux

    This post will list some useful commands which are usually used when you do with Linux/Mac OS.


    11 Aug 2013

    Startup Toolkit: The Best Tools for Entrepreneurs

    Today, we are gonna list all greatest tools for entrepreneurs and startups.


    18 Jun 2013

    Making money, easy or difficult?

    Suddenly, I found some ways tech guys usually applied to generate money. Because I am also a technican, so I should care this problem like a obtainable options for my life. Of course, sharing is always fine. That makes me write this post. In next words, I show you several approaches to help yourself be richer, or maybe be financial freedom.


    23 May 2013

    Google Tech Talk - A huge resource for IT Student

    Almost CS students have known that Google is a giant leading innovation in today's world. A plenty of its products brought extraordinary experience to human race in many aspects of life. It is possible to say that Google Search Engine has changed totally the way people looking for information. Besides this tool, there are a large number of products which have ability to persuade billions people all over the world to be addicted them.


    19 May 2013

    The first journey to hometown

    The idea of cycling to hometown came many days ago but due to several reasons, I could not perform this awesome plan immediately. However, today - a beautiful day, I decided to come back home by riding using my second lover - Columbia 18x (it is MTB bicycle). Although there were some issues in my road, it was still wonderful experience to me. That means I will continue this plan, go back Hanoi (our capital city) and come back my village again, utilizing Columbia in both cases.


    14 May 2013

    Sinh viên CNTT nên và cần học gì?

    Dường như, chưa một cơ sở đào tạo nào ở Việt Nam, từ trường đại học cho tới các trung tâm đào tạo nhân lực công nghệ thông tin chỉ rõ cho sinh viên, học viên hiểu được những điều nên, và cần trau dồi trong quá trình học tập. Một hệ luỵ phổ biến là người học không biết mình đang học gì, có ứng dụng thế nào, và đáng buồn hơn cả là không biết về sau mình sẽ làm gì. Mục tiêu không rõ ràng, hoài bão chỉ quanh quẩn ở việc ra được trường và có may mắn để xin được việc thực sự đang làm lụi tàn khả năng của họ mà đáng ra có thể đóng góp nhiều hơn cho nền công nghệ nước nhà cũng như tốt hơn cho chính họ.


    13 May 2013

    Web And Mobile Revenue Models

    This post is inspired by a hackpad post. In my opinion, it is extremely useful for IT man. Let learn how to monetize!


    13 May 2013

    Quora Corner

    Aww, it seems very amazing when you traverse Quora to face with many curious questions. In the spare time, I usually *quora* and sometimes I must burst into a laugh because of some stupid questions and a plenty of ridiculous answers. That is why I create this post to keep those things.


    13 May 2013

    Mô hình sinh lợi nhuận trong lĩnh vực Web và Mobile

    Thể theo nguyện vọng của bạn boy2tay2sung, mình đưa bài viết này lên, là phiên bản tiếng Việt của bài viết Web And Mobile Revenue Models vừa được post cách đây vài giờ đồng hồ. Cũng xin nói thêm một chút, nội dung của bài viết phỏng theo chia sẻ ở đây của Fred Wilson-một nhà đầu tư, chủ tịch quỹ đầu tư Union Square Ventures. Tuy nhiên, để có được bản tổng kết này, cũng có rất nhiều nhà đầu tư, CEO đóng góp cho bản thảo không chính thức của Fred, trong đó, cũng có một vài đóng...


    12 May 2013

    Get started with iOS Programming

    Recently, I had been decided what kind of software industry field which should be followed. There were actually two choices, whether Big Data belongs to Data Mining techniques or Mobile Development is with creating a large number of awesome applications for the rest.


    11 May 2013

    Hello World

    Kick off. Let’s start blogging!



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