KBus
Super lightweight (13 LOC) and minimalistic (post(), subscribe(), unsubscribe()) EventBus written with idiomatic Kotlin and RxJava 2
KBus in 3 steps
1. Define your events
// With data
data class ShowMessageEvent(val message: String)
// Without data
class OtherEvent2. Add subscribers
override fun onStart() {
super.onStart()
KBus.subscribe<ShowMessageEvent>(this) {
showMessage(it.message)
}
KBus.subscribe<OtherEvent>(this) {
doSomething()
}
}
override fun onStop() {
super.onStop()
KBus.unsubscribe(this)
}Where:
- ShowMessageEvent - the event you're subscribing
- this - the subscriber (by default the current Activity/Fragment)
- { showMessage() } - the subscription observer
- it - the event instance
Sticky events
If you want to post events between Activities/Fragments just subscribe in onCreate() (or onPostCreate()) and unsubscribe in onDestroy()
override fun onPostCreate(savedInstanceState: Bundle?) {
super.onPostCreate(savedInstanceState)
KBus.subscribe<ShowMessageEvent>(this) {
showMessage(it.message)
}
}
override fun onDestroy() {
super.onDestroy()
KBus.unsubscribe(this)
}3. Post events
KBus.post(ShowMessageEvent("Hello KBus!"))Add KBus to your project
repositories {
maven { url "https://jitpack.io" }
}
dependencies {
implementation 'io.reactivex.rxjava2:rxjava:2.2.10'
implementation 'com.github.adrielcafe:KBus:1.1'
}