🧩 Handling and maintain your a UI view component easily
An UI view component architecture for handling state of widget view component using event broadcaster. Floppy comes from the problem when we had a lot of widget view in Fragment or Activity and we must handling a lot of state as well. With floppy, you can separate a lot of your widget stack into a new UIComponent independently, and you can maintain easily the state and data delivery.
Floppy has several component you should have, such as:
name | description | required |
---|---|---|
UIView | define your resource widget and binding the data | yes |
UIComponent | handling the lifecycle and UI state of UIView | yes |
InteractionEvent | state interaction event to handling behaviour of view | no |
StateEvent | your central data state for all of UIComponent | yes |
let's take look an example of playstore app:
- Coroutines
- Android Lifecycle
- Viewmodel
- EventBusFactory (required, event broadcaster)
- Reusable view component in any ViewGroup (containers)
- Preventing a boilerplate code
- Centralize behaviour and state management
- Maintain a huge view component easily
let's breakdown the example of playstore app detail above.
first, assume, you've view_application_info.xml
, looks like this:
<androidx.constraintlayout.widget.ConstraintLayout
...
android:id="@+id/container_app_info"
...
>
<!-- something cardView -->
</androidx.constraintlayout.widget.ConstraintLayout>
then, create the UIView for that one, like this:
class ApplicationInfoUIView(
container: ViewGroup
): UIView(container) {
private val view: View = LayoutInflater
.from(container.context)
.inflate(R.layout.view_application_info, container, true)
.findViewById(R.id.container_app_info)
override val containerId: Int = view.id
private val icApplication: ImageView = view.findViewById(R.id.ic_application)
private val txtName: TextView = view.findViewById(R.id.txt_name)
fun bind(info: ApplicationInfo) {
icApplication.load(info.icon)
txtName.text = info.name
}
override fun show() {
view.visibility = View.VISIBLE
}
override fun hide() {
view.visibility = View.GONE
}
}
after that, create an UIComponent for an ApplicationInfo
class ApplicationInfoComponent(
container: ViewGroup,
private val bus: EventBusFactory,
coroutineScope: CoroutineScope,
dispatcher: DispatcherProvider
): UIComponent<Unit>, CoroutineScope by coroutineScope {
@VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
val uiView = initView(container)
private fun initView(container: ViewGroup): ApplicationInfoUIView {
return ApplicationInfoUIView(container)
}
init {
launch(dispatcher.immediate()) {
bus.getSafeManagedFlow(ScreenStateEvent::class.java)
.collect {
when (it) {
ScreenStateEvent.Init -> uiView.hide()
is ScreenStateEvent.SetApplicationInfo -> {
setApplicationInfo(it.appInfo)
}
}
}
}
}
private fun setApplicationInfo(info: ApplicationInfo) {
uiView.bind(info)
uiView.show()
}
override fun containerId(): Int = uiView.containerId
override fun interactionEvents(): Flow<Unit> {
//if there's no interactionEvent
return emptyFlow()
}
}
and this is your central stateEvent looks like, ScreenStateEvent.kt
sealed class ScreenStateEvent: ComponentEvent {
object Init : ScreenStateEvent()
data class SetApplicationInfo(val appInfo: ApplicationInfo): ScreenStateEvent()
}
after created the UIComponent, UIView, and defined the event state of ApplicationInfo, you can use it like this.
create the container's UI component in fragment_app_detail.xml
:
<RelativeLayout
...
>
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="@+id/container_app_detail"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
then, attach the ApplicationInfo's card like this:
class AppDetailFragment: Fragment(), CoroutineScope {
...
private lateinit var appInfoComponent: UIComponent<*>
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.fragment_app_detail, container, false)
initComponents(view.findViewById(R.id.container_app_detail) as ViewGroup)
return view
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
setPersonInfo(ApplicationInfo(
icon = "icon.png",
name = "Alto's Odyssey"
))
}
private fun initComponents(container: ViewGroup) {
appInfoComponent = initApplicationInfoComponent(container)
initialState()
}
private fun initialState() {
launch(dispatchers.immediate()) {
EventBusFactory.get(viewLifecycleOwner).emit(
ScreenStateEvent::class.java,
ScreenStateEvent.Init
)
}
}
private fun setPersonInfo(info: ApplicationInfo) {
launch {
EventBusFactory.get(viewLifecycleOwner)
.emit(
ScreenStateEvent::class.java,
ScreenStateEvent.SetApplicationInfo(info)
)
}
}
fun initApplicationInfoComponent(
container: ViewGroup
): UIComponent<Unit> {
val detailComponent = DetailComponent(
container,
EventBusFactory.get(viweLifecycleOwner),
coroutineScope,
dispatchers
).also(lifecycleOwner.lifecycle::addObserver)
coroutineScope.launch {
detailComponent.interactionEvents()
}
return pinnedComponent
}
override fun onDestroyView() {
super.onDestroyView()
job.cancel()
}
}
and finally, you can see your ApplicationInfoCard on your AppDetailFragment! 🎉
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Copyright 2020 isfaaghyth (Muh Isfhani Ghiath)
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