Lesson 37: – Higher Order Functions in kotlin
Kotlin is an object-oriented language but introduces features in functional languages that allow us to create a clearer and more expressive code. One of the characteristi...
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Lesson 8 – Control ImageButton
We have seen the creation of objects of the Button class, now we will see another class very similar to the previous called ImageButton that has the same philosophy of ha...
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Lesson 5: How to implement CheckBox Control and example
The objective of this concept is to continue practicing projects with Android Studio and incorporate the visual control CheckBox. Create a project called Project004. Prob...
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Lesson 46 – List and MutableList in Kotlin Programming Language
A list is an ordered collection of data. An item can be retrieved by the position in the collection. We can create in Kotlin both immutable and mutable lists. Creation of...
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Lesson 15: WordPress MultiSite – Website SEO Tutorial
Multisite networks under WordPress have the great advantage that in this way several different pages within a domain can be conveniently managed from a single back-end. T...
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Lesson 3: Part 2 – OnPage SEO for beginners
The OnPage optimization deals with all essential components of the search engine optimization, which are directly related to the website or in relation to the content des...
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Android O: features – new OS for developers preview
The news for the APP developers of the new version of Android that will be released to 0 in September 2017. As usual, Google released in preview the new version of the op...
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Lesson 39 – Touch event: draw a circle in kotlin
A fundamental activity is to be able to detect when the user selects or touches the touch screen. Issue: Develop a program that draws a circle in the 100,100 coordinate. ...
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Lesson 33 – Draw: circles in kotlin
Issue: Paint the white background and draw 10 circles growing from the middle of the screen. 1 – We created a project called: Projecto037 We delete the TextView tha...
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PHP Lesson 18 – How to Send e-mails with PHP
The email function of PHP is very handy because it allows us to send form data or create entire newsletter scripts. You can also use this procedure for a guestbook, for e...
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lesson 33: OOP – inheritance in Kotlin Language
We saw in previous concepts that two classes can be related by the collaboration (in one of them we define a property of the type of the other class). Now we will see ano...
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Lesson 2 – Qualities of a good web hosting
Good webspace is at the heart of any successful website. Whether you use ready-made content management systems such as WordPress or use the knowledge acquired here to dev...
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Lesson 6 – Variables in PHP
A fundamental concept of any programming language is variables. Variables in PHP can contain values of any kind, such as simple lines or texts, but also more complex stru...
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Lesson 24 – Play, Pause, Resume, and Stop an Audio file in kotlin
Create an application that allows you to start an mp3 file, stop, continue, permanently stop and activate or not playback in a circular way. Create an mp3 file with the A...
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Lesson 18: Onpage analysis – Website SEO Tutorial
The OnPage analysis of competition websites helps SEOs get an overview of the competition in the search results of Google & Co. In contrast to OffPage analysis of the...
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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...
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Lesson 28: Record audio using Android recorder (via Intent) in Kotlin
The easiest way to capture audio on Android is through the recorder provided by the Android operating system. We invoke the recording application and then recover the rec...
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How to Install Java (JDK)
Install Java Download Kit (JDK) In order to do start kotlin (anroid studio) we must install the Java compiler and the Java virtual machine. These tools can be downloaded...
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Lesson 31 – Draw: draw background and draw lines in Kotlin
Paint the yellow background and draw a series of lines with different styles. 1 – We created a project called: Project034 We delete the TextView that automatically...
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Lesson 24 – Object-oriented programming concepts in kotlin Language
Kotlin allows us to use the methodology of object-oriented programming. Object-oriented programming (OOP) will introduce concepts of object, class, property, field, metho...
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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...
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Lesson 37 – Draw: text on a path in kotlin
If we want to have text that is not horizontal, we must create a path indicating the points where the text will pass. 1 – We created a project called: Proyecto041 W...
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Lesson 10 – Control EditText and example
From the first problem, we have been using the control that allows in Android to enter values by keyboard. The class that manages keyboard input is EditText. But in the c...
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Lesson 5: Keyboard Data Entry on the Console in Kotlin language
Keyboard Data Entry on the Console in Kotlin. When we use the Console to display information on screen we use the print and println functions. If we need to enter data by...
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The Most Important PHP functions
There are hundreds of functions in PHP, but most of them are rarely or never used. In the following you will find the most important PHP functions. For a complete list of...
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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...
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25 SEO key points for webmasters 2017
Anyone who owns or operates their own website will sooner or later deal with the subject of search engine optimization / SEO, regardless of whether the site is now a simp...
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Lesson 29: Record audio using the MediaRecorder class in Kotlin
Another way to record audio on Android is to use the MediaRecorder class. This class gives us more freedom when it comes to building an application that requires audio re...
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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...
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PHP Lesson 23 – How to Upload file $_FILES, move_uploaded_file()
The following script will explain how to enable a simple file upload. Your visitor can select a file from their local hard drive and then upload it to your webspace. For...
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