MultiViewAdapter

Library for easily displaying multiple view types in RecyclerView adapter. You don't even need to write custom adapter and ViewHolder.

Note: library is AndroidX-only

Setup

Library is available on jCenter

Add dependency to your app's build.gradle

dependencies {
    implementation "serg.chuprin:multiviewadapter:$latestVersion"
}

Also you can use adapter with kotlin-android-extensions

apply plugin: 'kotlin-android-extensions'

androidExtensions {
    experimental = true
}

dependencies {
    implementation "serg.chuprin:multiviewadapter-kt-extensions:$latestVersion"
}

How to use

Choose which adapter to use

• MultiViewAdapter - if you don't have any strict type hierarchy, all items will have Any type
• TypedMultiViewAdapter - if you have specific type (sealed class, for example)
• DiffMultiViewAdapter - if you want to get benefit from automatic lists diffing and animations

Create renderer

Renderer - class that represents concrete view type and can render concrete model

If you want to get power of kotlin android-extensions and don't want to write ViewHolder, use ContainerRenderer.

Or you can use library in old way and create custom ViewRenderer

class UserRenderer : ContainerRenderer<UserEntity>() {

    override val type: Int = R.layout.list_item_user

    override fun bindView(holder: ContainerHolder, model: UserEntity) {
        holder.itemView.textView.text = model.login
    }
}

Register renderer

val adapter = MultiViewAdapter().apply {
    registerRenderer(UserRenderer())   
}

If you use Java, you need to specify type explicitly

MultiViewAdapter adapter = new MultiViewAdapter();
adapter.registerRenderer(new UserRenderer(), UserEntity.class);

Done!

Click listeners

To add click listener, override method onVhCreated in your renderer. Then set listener on the view.

class UserRenderer : ContainerRenderer<UserEntity>() {

    ...
    override fun onVhCreated(
        holder: ContainerHolder,
        clickListener: Click?,
        longClickListener: LongClick?
    ) {
        holder.itemView.userLogo.setOnClickListener {
            clickListener?.onClick(it, holder.layoutPosition)
        }
    }
}

Then react to click events:

adapter.clickListener = { model, view, position -> TODO() }

DiffUtil

Library has DiffMultiViewAdapter - the equivalent to ListAdapter from support library. It uses AsyncListDiffer internally for calculating diff on background thread. You don't need to care about any notifying adapter about data changes, just set new items!