ArchData provides two missing LiveData of Android Lifecycle Component and useful extension functions.
MutableLiveData shares only last state to its new observers when they start to observe.
But in some cases, either these observers may want to do fresh start or they want to get all previous states.
PublishLiveData and ReplayLiveData types are extensions of MutableLiveData.
Basically:
PublishLiveDataisMutableLiveData, which only notify its observers if there is an event after their starting of observation.ReplayLiveDataisMutableLiveData, which only notify its observers for all previous events happened before their observation starts.
Extension Functions:
nonNullObserveis extension function, which eliminates nullable invokes of Observer.
LiveDataAction:
LiveDataActionis special object type for LiveData,which enables observer can listen LiveData object without parameter. It is useful when Action/Command use cases.
-
PublishLiveDataLiveData that, once an
Observerhas subscribed, emits all subsequently observed items to the subscriber.val liveData = PublishLiveData<String>(); // observer1 will receive all events liveData.observe(lifeCycleOwner,observer1) liveData.postValue("one") liveData.postValue("two") // observer2 will only receive "three" liveData.observe(lifeCycleOwner,observer2) liveData.postValue("three")
-
ReplayLiveDataLiveData that buffers all items it observes and replays them to any
Observerthat subscribes.val liveData = ReplayLiveData<String>() liveData.postValue("one") liveData.postValue("two") liveData.postValue("three") // both of the following will get the events from above liveData.observe(lifeCycleOwner,observer1) liveData.postValue(lifeCycleOwner,observer2)
-
nonNullObserveobserve method which eliminates nullable invocation of observers.
val liveData = MutableLiveData<String>() ... viewModel.liveData.nonNullObserve(lifeCycleOwner,::onLiveDataEvent) ... fun onLiveDataEvent(event: String){ //Do something good!. }
-
LiveDataActionObject Type which enables invocation listener methods without parameter
val liveData = MutableLiveData<LiveDataAction>() ... viewModel.liveData.nonNullObserve(lifeCycleOwner,::onLiveDataAction) ... fun onLiveDataEvent(){ //Do something really good!. }
Maven:
<dependency>
<groupId>me.ibrahimyilmaz</groupId>
<artifactId>ArchData</artifactId>
<version>0.0.4</version>
<type>pom</type>
</dependency>Gradle:
compile 'me.ibrahimyilmaz:ArchData:0.0.4'MIT License
Copyright (c) [2019] [IBRAHIM YILMAZ | [email protected]]
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