Kotlin allows us to use the methodology of object-oriented programming. Object-oriented programming (OOP) will introduce concepts of object, class, property, field, metho...
Expired domains, ie expired domains, are those that were once registered and then were terminated after a certain time. As a result, these domains can then be registered...
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...
Concept of functions in Kotlin language. So far we have worked solving the whole problem in the main function proposed in Kotlin. This way of organizing a program can onl...
A variable is a shell where there is a value. It consists of a name and belongs to a type. In the Kotlin language if we need to store an integer value we can define a var...
The goal of this concept is to practice implementing a program that requires RadioButton type controls to select an activity. We will learn how to group a set of RadioBut...
A lambda expression is when we send an anonymous function directly to a higher-order function. It is more common to send a lambda expression instead of sending the refere...
In addition to backlinks and content quality, Google and many other search engines place more emphasis on so-called user signals. This means that factors are included in...
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...
Conditional if Statement in Kotlin Language. When a decision is made, conditional structures appear. In our daily life we have situations where we have to decide. Do I ch...
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...
The WDF * IDF formula calculates the frequency, or frequency, of a keyword, term, or term within a document, and then sets it in relation to all other terms that appear o...
The PageRank (PR) is the most important reason why Google is today the most successful search engine in English-speaking and European countries. The PageRank is a rating...
In some cases, it is necessary to execute a statement until a certain result occurs. This is also used, for example, to output the contents of databases (eg MySQL) or sim...
In this tutorial, we will program trigonometric functions of a scientific calculator, with the syntax of Kotlin, the cool programming alternative in Java. Although...
Another resource that allows the Canvas class is to plot text. 1 – We created a project called: Project039 We delete the TextView that automatically adds the Androi...
For loop and range expressions in Kotlin Language. The for loop structure has some variants in Kotlin, in this concept we will see the for loop structure with range expre...
The goal of this concept is to continue practicing what has been seen until now and incorporate the Spinner visual control. The Spinner control displays a String list and...
Issue: Paint the white background and draw a series of rectangles with different styles. 1 – We created a project called: Proyecto036 We delete the TextView that au...
Passive link Building is also called in today’s search engine optimization, content marketing. In doing so, good content is created, which is subsequently advertise...
Backlinks differ in their appearance, as well as in their anchor text and their follow-up status. In the following, the most important types of linguists are explained so...
In some situations we have methods and properties common to a set of classes, we can group these methods and properties into an abstract class. There is a special syntax...
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...
The purpose of this concept is to access an mp3 file stored on the SD card of our computer (keep in mind that this only works with a computer that has the capacity of SD...
The success of an online blog, no matter what topic it is dealing with, depends on many different factors. In addition to the frequency of publication and the quality of...
This metric shows how many pages are viewed on average per session and is a good indicator of the quality of a web page and its internal linking. Naturally, the number of...
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...
We can build applications and incorporate external True Type fonts. For this, we will implement an application that shows a text with an external source. 1 – We cre...
Xml Sitemaps solve a big problem in the search engine optimization, because with the help of sitemaps, both crawlers and visitors get a quick and easy overview of the ind...
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...
