Tutorial by Topics: id

tidyr has two tools for reshaping data: gather (wide to long) and spread (long to wide). See Reshaping data for other options.

Whenever you work with video feeds you may eventually want to save your image processing result in a form of a new video file. For simple video outputs you can use the OpenCV built-in VideoWriter class, designed for this. It is useful to look at some concepts before using them. These concepts are co...

In this post I will demonstrate how to pass external data to Angular app before the app bootstraps. This external data could be configuration data, legacy data, server rendered etc.

Proguard is free Java class file shrinker, optimizer, obfuscator, and preverifier. It detects and removes unused classes, fields, methods, and attributes. It optimizes bytecode and removes unused instructions. It renames the remaining classes, fields, and methods using short meaningless names. ...

Android supports all Java 7 language features and a subset of Java 8 language features that vary by platform version. This page describes the new language features you can use, how to properly configure your project to use them and any known issues you may encounter.

Genymotion is a fast third-party emulator that can be used instead of the default Android emulator. In some cases it's as good as or better than developing on actual devices!

WebView component allow you to provide custom client object that extends WebViewClient class to listen and control WebView behavior.

QLabel is used for displaying text or an image. No user interaction functionality is provided. The visual appearance of the label can be configured in various ways, and it can be used for specifying a focus mnemonic key for another widget. A QLabel object acts as a placeholder to display non-e...

In Go Middleware can be used to execute code before and after handler function. It uses the power of Single Function Interfaces. Can be introduced at any time without affecting the other middleware. For Ex: Authentication logging can be added in later stages of development without disturbing the e...

The layouts are a necessary in every Qt application. They manage the object, their position, their size, how they are resized. From Qt layout documentation: When you use a layout, you do not need to pass a parent when constructing the child widgets. The layout will automatically reparent ...

Arduino's Liquid Crystal Library is a library for controlling LCD displays compatible the Hitachi HD44780 driver, characterised by their 16 pin interface. The 16 pins might be connected via an I2C interface. These displays contain a matrix of 5x7 pixel blocks used to display characters or small mono...

The intent of this topic to demonstrate some basic MIDI programs that show how to operate with the protocol and progressively add useful features that more complex applications require.

When an instance of GridLayout is set on a Composite (or a subclass of Composite), all child controls will be arranged in a grid pattern. When there are multiple columns, the grid is populated from left to right, and from top to bottom. In addition to specifying the number of columns, you can optio...

Kotlin has a built-in view injection for Android, allowing to skip manual binding or need for frameworks such as ButterKnife. Some of the advantages are a nicer syntax, better static typing and thus being less error-prone.

This section provides an overview of what selenium-ide is, and why a developer might want to use it. It should also mention any large subjects within selenium-ide, and link out to the related topics. Since the Documentation for selenium-ide is new, you may need to create initial versions of tho...

AIDL is Android interface definition language. What? Why? How ? What? It is a bounded services. This AIDL service will be active till atleast one of the client is exist. It works based on marshaling and unmarshaling concept. Why? Remote applications can access your service + Multi Threading....

In this topic you will explore two approaches to conditionally hiding tabs on data entry screens in Acumatica.

For some time I've searched for the best way to log requests and response in an ASP.Net Core. I was developing services and one of the requirements was to record request with its response in one record the the database. So many topics out there but none worked for me. it's either for request only, r...