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Kotlin

A collection of 16 posts

Singleton in Kotlin

Singleton in Kotlin

In the Kotlin programming language, a singleton is a design pattern that allows you to create only one instance of a class. This is useful when you want to make sure that there is only one instance of a particular class, for example, if you want to create a global

Use keystore to store your sensitive in Kotlin

Use keystore to store your sensitive in Kotlin

The keystore is a secure storage location in Android that is used to store encryption keys, digital certificates, and other sensitive information. The keystore is encrypted with a hardware-based key, which makes it much more difficult for an attacker to access the stored data. To use the keystore in Kotlin,

Certificate pinning and Public key pinning in Kotlin

Certificate pinning and Public key pinning in Kotlin

With the last article (Certificate pinning and Public key pinning), we know the concept of Certificate pinning and Public key pinning, and how to implement them in iOS. This article will demonstrate how to implement them in Kotlin. Implement certificate pinning Certificate pinning is a security technique that involves associating

Download image from URL in Kotlin

Download image from URL in Kotlin

In Android, we can get the image from synchronously and asynchronously, but it is more common to see in the later. Download image synchronously To download an image from a URL in Kotlin, you can use the URL class and the readBytes function from the kotlin.io library. The URL

Lazy in Kotlin

In the Kotlin programming language, the term "lazy" typically refers to a type of property or variable that is only initialized when it is first accessed, rather than when the containing object is created. This can be useful for optimizing the performance of an application, by delaying the

Encode URL in Kotlin

Encode URL in Kotlin

In Kotlin, you can use the URLEncoder class to encode a URL string so that it can be safely transmitted over the internet. The URLEncoder class is part of the Java standard library, and it provides a method called encode that can be used to encode a URL string. Here&

Difference between activity and requireActivity() in Kotlin

Difference between activity and requireActivity() in Kotlin

activity property In the Android framework, the Activity class represents an app's UI and provides an interface for the app to interact with the system. The activity property in a Fragment or Context object refers to the Activity that the Fragment or Context is currently associated with. Here

Start and Suspend a Coroutine in Kotlin

Start and Suspend a Coroutine in Kotlin

Kotlin Coroutines Table Content 1, Introduction to Coroutine in Kotlin 2, Non-blocking in Kotlin Coroutines 3, Start and Suspend a Coroutine in Kotlin (This article) With the previous articles (Introduction to Coroutine in Kotlin) on Kotlin Coroutine, we know there are two main ways to start a coroutine: launch and

Non-blocking in Kotlin Coroutines

Non-blocking in Kotlin Coroutines

Kotlin Coroutines Table Content 1, Introduction to Coroutine in Kotlin 2, Non-blocking in Kotlin Coroutines (This article) 3, Start and Suspend a Coroutine in Kotlin (incoming this week) From the last article, Introduction to Coroutine in Kotlin, it is known that Coroutine in Kotlin provides advantages such as lightweight, non-blocking

Introduction to Coroutine in Kotlin

Introduction to Coroutine in Kotlin

A Coroutine is a lightweight thread of execution that can be suspended and resumed later. There are already many articles or topics covering this but this post is different, it is simple and can let you get start more easily. It will cover the following parts: * Introduction to Coroutine in

How to make a custom view in Kotlin

How to make a custom view in Kotlin

To create a custom view in Kotlin, you can create a new subclass of View and override the onDraw method to draw the view's content. Then, you can add any additional properties or behavior that you want the view to have. Here is an example of a custom

Bottom Sheet Dialog implementation in kotlin

Bottom Sheet Dialog implementation in kotlin

To create a bottom sheet dialog in Kotlin, you can use the BottomSheetDialog class from the Android Support Library, which is a built-in package. Here's an example of how you can use a BottomSheetDialog in Kotlin: val bottomSheetDialog = BottomSheetDialog(this) val view = layoutInflater.inflate(R.layout.example_bottom_

Type safe in programming language

Type safe in programming language

Introduction Type safety in programming languages refers to the concept that variables and data structures are strongly typed and cannot be assigned values of different types. This means that the programming language will not allow the programmer to accidentally or intentionally assign a incorrect type to a variable or data

Companion Object in Kotlin

Companion Object in Kotlin

Kotlin provides a brand new keyword companion which not exists in other programming languages. But don't be panic, it is not something new when you have one step closer. A companion object is considered as a very special object that is associated with a class, which many of

An easy example on how to use Jetpack ViewModel and LiveData

An easy example on how to use Jetpack ViewModel and LiveData

Jetpack broken up into four main areas: Architecture, Foundation, Behavior and UI. ViewModel ViewModel helped to achieve two things: * help the project to adopt MVVM architecture * hold the data in the memory in a life-cycle manner One of the benefits of using ViewModel is the data can be kept while

Android: Are you familiar with onCreate(), onStart() onResume() and ...

Android: Are you familiar with onCreate(), onStart() onResume() and ...

running order of onCreate, onStart, onResume and onDestory .... in Android using Kotlin