How to insert a logo or image into a QR code using Photoshop

This article describes different methods of changing a QR code in Photoshop that allow to insert a logo, image or text. The custom or branded QR code will be read correctly despite the modification. The QR (Quick Response code, Denso Barcode, ISO/IEC18004) code represents a two-dimensional code bar, initially used by industry, but widely used […]

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Android Tutorial (4) – Procedural vs. Declarative Design of User Interfaces

Android mobile applications are relying on user interfaces composed on dialog windows, visual controls, 2D graphics and other multimedia elements for efficiency and usability. The Android platforms allows programmers to use two methods to design user interfaces: procedural or declarative. In this post we develop a simple Android mobile applications that will help to make […]

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Android Tutorial – Overview and contents

The Android tutorial covers all important concepts that will allow a new programmer to learn how to develop mobile applications for the Android platform. The tutorial is written  from a programmer perspective and dives after few topics into simple and do-by-example applications which are easy to follow. Despite the apparently simplicity, each topic highlights important […]

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How to convert a byte array to a Hex String in Java

When processing binary values it is very difficult to read or to display them because any printing function generates a String value.  The problem with this approach is that not all byte values can be interpreted as a printable char (i.e. the 0 binary value represents the NUL symbol; for more details check ASCII Codes […]

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Android Tutorial (2) – Applications key concepts, activities and resources

In order to understand the Android application architecture you need some basic knowledge regarding Android applications key concepts. Understanding these elements will allow you to control: application components application lifecycle application resources In this post are described all these key concepts  in order to highlight their role, utility and importance. Other posts will describe in more […]

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Android Tutorial (01) – Setting the development environment

Android is an open source software toolkit created by Google and Open Handset Alliance. Initially developed for mobile phones, it has become a major application platform for a wide range of mobile devices. The scope of this post is to summarize the steps needed to set the development environment and to start learning and developing […]

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