Realize EventBus with LiveData

JaredDoge

Last update: Oct 25, 2022

Related tags

Kotlin LiveDataBus

Overview

LiveDataBus

增強UnPeek-LiveData，將其包裝成觀察者模式的事件總線

Getting started

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

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

Add the dependency

dependencies {
         implementation 'com.github.JaredDoge:LiveDataBus:{latest_version}'
  }

Usage

observe

LiveDataBus.get<String>(key).observe(lifecycleOwner){
            print(it)
}

當你的lifecycleOwner使用fragment時，可以調用擴充方法toViewLife()將其轉為viewLifecycleOwner

setValue

LiveDataBus.get<String>(key).setValue(msg)

SingleLiveData

當然，你可以單獨使用SingleLiveData，以確保訊息來源是可靠的。

例如在viewModel中:

class MainViewModel : ViewModel() {

    val showToast: SingleLiveData<String> = SingleLiveData<String>()
    
    fun show(){
        showToast.setValue("testMsg")
    }
}

Activity

mainViewModel.showToast.observe(this){
    //確保訊息來源是來自MainViewModel的showToast
    Toast.makeText(this, it, Toast.LENGTH_SHORT).show()
}

Dynamic Proxy

除了使用.get(key)取得總線外，還可以使用.of()的方式，避免key打錯的問題。首先先建立一個interface

interface

interface SampleEvent {

    //Int為總線的資料型態      
    fun message(): SingleLiveData<Int>
    
    //可以建立多個總線
    //fun message2(): SingleLiveData<String>
    //fun message3(): StringLvieData<MyJavaBean>
    //....
}

因為使用動態代理的關係，所以必須是interface

observe

LiveDataBus.of<SampleEvent>().message().observe(this){
  //it is Int
}

setValue

LiveDataBus.of<SampleEvent>().message().setValue(123)

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Releases(1.1.0)

1.1.0(Nov 26, 2021)

feat: 1.將BusLiveData更名為SingleLiveData 2.取消自動調用LifecycleOwner.toViewLife()
Source code(tar.gz)
Source code(zip)

Realize EventBus with LiveData

Related tags

Overview

LiveDataBus

Getting started

Usage

observe

setValue

SingleLiveData

Dynamic Proxy

interface

observe

setValue

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Owner

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