Event For Live Data

Simple event structure for single-time events like showing popup observed from LiveData

Taken from JoseAlcerreca's medium post and packaged into gradle library for ease of use.

https://medium.com/androiddevelopers/livedata-with-snackbar-navigation-and-other-events-the-singleliveevent-case-ac2622673150

Installing

Step 1. Add it in your root build.gradle at the end of repositories:

allprojects {
  repositories {
    ...
    maven { url 'https://jitpack.io' }
  }
}

Step 2. Add the dependency

dependencies {
  implementation 'com.github.alperenbabagil:EventForLiveData:1.2.1'
}

Usage

Wrap your data with Event<T> class. Then use it in LiveData

val observeMe : LiveData<Event<MyAwesomeModel>>

Then observe your viewModel with EventObserver<T>

viewModel.observeMe.observe(this,EventObserver{ myAwesomeModel -> 
    // Every Event instance observed here once
})

or just use observeEvent extension function of LiveData

viewModel.observeMe.observeEvent(this){ myAwesomeModel ->
    // Every Event instance observed here once
}

even shorter use observeEvent extension function of LifecycleOwner(Activity,Fragment etc.). Just call observeEvent method in your LifecycleOwner:

observeEvent.(viewModel.observeMe){ myAwesomeModel ->
    // Every Event instance observed here once
}