Android - Kotlin

Introduction: Reactive Programming is a programming paradigm that’s concerned with data streams and propagation of change. The reactive model listens to changes in the event and runs the relevant code accordingly. RxJava is a Java based implementation of Reactive Programming. Whereas, RxAndroid is specific to Android platform which utilises some classes on top of the RxJava library. Classes and Concepts: There are 3 main components in RxJava. (i) Observable - It emits a stream of data or events. i.e., a class that can be used to perform some action, and publish the result. (ii) Observer - It receivers the events or data and acts upon it. i.e. a class that waits and watches the Observable, and reacts whenever the Observable publishes results. It have 4 interface methods to know the different states of Observable, as follows:         onSubscribe() - invoked when the Observer is subscribed.         onNext() - invoked when the new item is emitted from Observer.

Hey Guyss!! Already we have seen the basics of Databinding and how to use it in previous  post . Now let's see how to use Databinding in RecyclerView . And Its gonna be a short post. ;) You can find the Project in GitHub . Prerequisite: build.gradle First, we have enable dataBinding in app-level build.gradle                           android {                                     dataBinding {                                             enabled = true                                     }                            } Next, we have add the following plugin.                               apply plugin: 'kotlin-kapt'  Next, we have to include dependency for databinding, (Not needed, if using Android Studio 3.2 or above, since its already bundled)                             kapt "com.android.databinding:compiler:3.2.0-alpha10" Implementation: We can directly bind the data to RecyclerView's Adapter layout. So, let's design the

Introduction: WorkManager is one of the Android JetPack component. It is specifically designed for scheduling and managing background tasks. If the app is running, task will be executed in a new thread. Otherwise, WorkManager automatically chooses an appropriate way to do so. It can be AlarmManager, JobScheduler or Firebase JobDispatcher, depends on device's API level and its dependencies. WorkManager Basics: Worker WorkRequest WorkManager WorkInfo (i) Worker: It specifies what task need to be performed. class SampleWorker (context: Context, workerParams: WorkerParameters) : Worker(context, workerParams) { override fun doWork (): ListenableWorker. Result { //do the work here return ListenableWorker. Result . SUCCESS } } (ii) WorkRequest: It represents which Worker should perform the task. Also we can specify any constraints/circumstances, based on which the task should be performed. Constraints can be of Net