Lesson 13: Do / while Looping Statement in kotlin Language
The do / while Looping structure is another looping structure, which executes its repetitive block at least once, unlike the while that might not execute the block. This...
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Lesson 12: While Loop in Kotlin Language
While Loop in Kotlin Language. So far we have used SEQUENTIAL and CONDITIONAL structures. There is another type of structures as important as the previous ones are LOOPIN...
Read more A common memory leak in Android
A common memory leak in Android Although the mobile phone memory is increasing, but Android in order to achieve different applications running isolation, and will not aff...
Read more Lesson 30 – Draw: graphing pixels in kotlin
Issue: Graph 10000 pixels in a random white color on the device screen with black background. In order to do this simple task we must follow a series of steps: 1 –...
Read more Lesson 41 – Extension Functions In Kotlin language
Another very useful feature of Kotlin for programmers is the concept of extension functions. Using the extension functions Kotlin allows us to add other methods to an exi...
Read more Lessn 45 – Kotlin programming language Collections
Kotlin provides a wide range of classes for managing collections of data. We have already seen some of the classes that allow managing collections: For basic data types (...
Read more PHP Lesson 11: Logical operators AND, OR, !, &&, || ()
Often it is not enough to check only one condition in an if statement. For example, if you do a password query, you want to know if the username and password are correct....
Read more Lesson 19 – Layout (TableLayout) in Kotlin Example
The Layout of type TableLayout groups components into rows and columns. A TableLayout contains a set of TableRow-like components that group visual components for each row...
Read more Lesson 48 -Set and MutableSet in Kotlin Programming Language.
The Set and MutableSet (set) classes allow you to store a set of elements that must be all different. It does not allow storing repeated data. A set is a collection of it...
Read more Lesson 20 – Layout (FrameLayout) Example in Kotlin
The FrameLayout type control has all the visual controls aligned to the upper left vertex, centered, right lower vertex, and so on inside the container. (it has nine poss...
Read more Save items – SharedPreferences (kotlin/java) Example
Introduction to SharedPreferences (kotlin/java) Under Android, it is common to want to save an element, for example, the name of the connected user, or for example a stri...
Read more Several useful new features in Android Studio 2.2
Android Studio 2.2 preview provides several new toys, very useful, as follows: Espresso Test Recorder Dependencies Management APK analyzer View the merged sources for And...
Read more Lesson 9: What is Black Hat SEO? – Website SEO Tutorial
By definition, all of the measures of the so-called “black hat” SEO that violate Google’s guidelines, which is why Google is very much on the side with...
Read more Lesson 56: Bounce Rate – Website SEO Tutorial
The bounce rate is perhaps the most important user signal that exists. A bounce occurs when a visitor arrives on a web page through the results of the Google search and i...
Read more Lesson 40: DoFollow – Website SEO Tutorial
Meanwhile, you should know what a DoFollow link means. The rel = “dofollow” attribute on a link tells the search engine crawler to understand that this link i...
Read more Lesson 27: Class collaboration in Kotlin Language
Normally a problem solved with the methodology of object oriented programming does not involve a single class, but there are many classes that interact and communicate. W...
Read more Lesson 4 – How to Echo text in php
You can output a text in PHP using the language construct echo . Create a new file (eg hello.php ) for the first example and save the following text in it: <? Php echo...
Read more Lesson 23 – Audio playback (file in raw folder) in Kotlin
We will see the steps to play an mp3 file (other formats supported by Android are: Ogg, Wav) Issue: First, create a new project called Project025. Have two buttons with t...
Read more Lesson 17 – Installing Android App on a real device
Usually, one when developing applications on Android does all the programming, debugging and testing on a virtual device on the pc. Now let’s see the steps to test...
Read more PHP Lesson 21: How to create Fuctions Example
So far, we have mainly used functions that provide PHP. This tutorial is about writing and using your own functions. Often you have a certain programming problem that occ...
Read more Lesson 5 – Comments in PHP
Comments in PHP are not executed by the PHP interpreter, but are skipped by it instead. They serve as programmers to make your code easier to understand. You can, as the...
Read more Lesson 9: Composite conditions with logical operators in Kotlin Language
So far we have seen operators: Relational (>, <,> =, <=, ==,! =) Mathematicians (+, -, *, /,%) But we are missing other essential operators: Logical (&...
Read more Lesson 24: The Robots.txt – Website SEO Tutorial
The robots.txt file is located in the root directory of a webserver, or in the root directory of a webspace, and is used to give crawlers and bots instructions on how to...
Read more Lesson 28: OOP – private and public access modifiers in Kotlin
One of the fundamental principles of object-oriented programming is encapsulation, this is achieved by grouping a series of methods and properties within a class. In Kotl...
Read more Lesson 12: Launch a second “Activity” with Values (parameters)
We saw in the previous concept that a program can have more than one window representing each window with a class that inherits from AppCompatActivity. A very common situ...
Read more Lesson 27: Hub Pages – Website SEO Tutorial
As explained in point 10, hub pages form the pivotal point within the internal page structure of a web page. By accumulating and evenly distributing Linkjuice within the...
Read more Lesson 20: Meta data (Information) – Website SEO Tutorial
The meta-data plays a very important role in search engine optimization because they are located within an HTML document in the header area, so they are the first thing a...
Read more Lesson 49: – Package and Import – kotlin Programming language
The packages allow us to group classes, functions, objects, constants, etc. In a namespace for ease of use and maintenance. The packages group functionalities on a specif...
Read more Lesson 3 – Capture the click of a button in Kotlin
Problem: Make a program that allows the loading of two integers in controls of type EditText (Number). Display within the same EditText controls messages that request loa...
Read more 10 programming environments to develop Android apps without Java
As we know Android is the operating system that occupies the greater part of the market for mobile applications, so as Android developer it more logical is that you know...
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