Kotlin

RecyclerView Multi-Select using KOTLIN

Implementing multi-select on a Recycler View can be tricky and complicated. However, by the end of this tutorial, you’ll understand how to implement multi selection of items in a recycler view and do whatever you want (delete, share, copy etc) with the selected items . [box type=”info” align=”” class=”” width=””]Disclaimer I would like to mentally …

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Background Processing in Android using Async Task Loader

AsyncTaskLoader is a subclass of Loader, unlike AsyncTask’s, AsyncTaskLoader prevent duplication of background threads and eliminate duplication of zombie (dead or destroyed) activities. First, let’s talk about Loaders. What are Loaders? The Loader API lets you load data from a content provider or any other data source for display in an FragmentActivity or Fragment – Developer.Android.com The concept of Loaders was …

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Kotlin Data Classes

In this tutorial we are going to discuss kotlin data classes, and show some examples on how you can use them in your app. We frequently create classes whose main purpose is to hold data. In such a case some standard functionality and utility functions are often mechanically derivable from the data.

Open & Abstract Classes and Inheritance in Kotlin

Kotlin: Open & Abstract Classes and Inheritance

In object-oriented programming, inheritance enables new objects to take on the properties of existing objects. We can have a class that can inherit properties and methods from the parent class when we inherit classes, we do not need to specify the method and properties again, in the new class (child class or subclass). In essence, it allows us to …

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Kotlin: Class Examples

Class without a Constructor but with default variable (or properties or data) [box type=”info” align=”” class=”” width=””]In class-based object-oriented programming, a constructor is a special type of subroutine called to create an object. It prepares the new object for use, often accepting arguments that the constructor uses to set required member variables.[/box] class Person { …

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Kotlin ArrayList and Loops Example

Kotlin ArrayList Kotlin ArrayList is also very similar to Java Arraylist. ArrayList<T> is the resizable-array implementation of the List interface. The ArrayList class has only a few methods in addition to the methods available in the List interface. val myArrayList = arrayListOf(“John”, “Fred”, “McKinsey”, “Morgan”, “Sarah”) //an arraylist of my friends val newFriendList = arrayListOf(“Musa”, “Victor”, “Timothy”) myArrayList.add(0, …

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Kotlin: Array vs List – Similarities and Differences

// Initializing array and list val array = arrayOf(1, 2, 3) val list = listOf(“apple”, “ball”, “cow”) val mixedArray = arrayOf(true, 2.5, 1, 1.3f, 12000L, ‘a’) // mixed Array val mixedList = listOf(false, 3.5, 2, 1.4f, 13000L, ‘b’) // mixed List Arrays An array is a container object that holds a fixed number of values …

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