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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Lesson 43 – Functions: variable number of parameters
In the Kotlin language, a method of a class or function can receive a variable amount of parameters using the keyword “vararg” prior to the parameter name. Fr...
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Android Material Design and creation of apps with legacy APIs
The Material Design was introduced in Android 5 (Lollipop), but with Android 6 (Marshmallow) and Android 7 (nougat), has been enhanced with new features. In this tutorial...
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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...
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Lesson 6: Conditional if Statement in Kotlin Language
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...
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Lesson 8: What is Content Marketing? – Website SEO Tutorial
As mentioned in the section “What is SEO?” Already mentioned, there has been a development for a few months, which emphasizes a component which has been firml...
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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 (...
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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...
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PHP Lesson 12 – Common exercises
Here are three small exercises to deepen what you’ve just learned. First, we build a small password-protected page. Here’s an example of how to check if form...
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Lesson 55: Seo User signals – Website SEO Tutorial
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...
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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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Android UI controls – basic usage of ExpandableListView
ExpandableListView can display a view that scrolls vertically to show the entries in the two-level list, which is different from the list view (ListView). ExpandableListV...
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Scientific Mathematics Calculator using Kotlin Programming Language
In this tutorial, we will program trigonometric functions of a scientific calculator, with the syntax of Kotlin, the cool programming alternative in Java. Although...
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Lesson1: Installing tools to program for Android with Kotlin
Download tools needed to program for Android with Android Studio and Kotlin language 1 – First we must install the Java compiler and the virtual machine. These tool...
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Lesson 13: Page Structure – Website SEO Tutorial
The site structure is actually only a relatively small topic and the URL topic is not dissimilar, but I would like to take separately the two ways to design the website s...
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Lesson 5: What is Search Engine Optimization (SEO)? – Website seo tutorial
By definition from textbooks, Wikipedia, and other sources, search engine optimization is the sum of actions that are used to increase the ranking of individual sites to...
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PHP Lesson 7 – calculations (add, sqrt(), pow(), sub, mul) with variables
In addition to texts, as shown in the first part, you can also store numbers in variables and calculate with them, for example, add, subtract or multiply them. PHP Variab...
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Menu: Bottom navigation Bar (kotlin/java) Example.
Today we will discover a new way of making menus in Android. Menu: Bottom Navigation Bar Our new menu is called Bottom Navigation Bar. And you will see that this name rep...
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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 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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PHP Lesson 24 – How to set, Delete, Store Cookies, setcookie()
Cookies, like sessions, have the ability to capture specific data during a sequence of site views. However, cookies can also be used to store data beyond the session (eg...
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Lesson 36: Article Links – Website SEO Tutorial
As the name suggests, article links come from articles or contributions from blogs or news sites. The article link must be in the flow text of the article, it is not enou...
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Lesson 43: SEO link Building – website SEO Tutorial
The term “link building” refers to manually building DoFollow backlinks to a domain to increase their reputation on Google, to drive traffic to the page, and...
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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...
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Style settings in android listview properties
Style settings in android listview properties. In Android, ListView and its properties (headerDividersEnabled, choiceMode, footerDividersEnabled, dividerHeight, divider,...
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Lesson 18 – Layout (LinearLayout) in Kotlin Example
Android organizes the visual components (Button, EditText, TextView etc.) on the screen using containers called Layout. So far we have not worried how to organize a scree...
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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...
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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...
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Lesson 32: OOP – Named Object in kotlin language
Another feature of the Kotlin language is to be able to define an object immediately without having to declare a class. A new object keyword appears with which we can cre...
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Lesson 41: NoFollow – Website SEO Tutorial
The nofollow attribute is a statement in the HTML code that tells crawlers not to include an outgoing link in the calculation of the link popularity and thus also in the...
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