RecyclerView Presenter

Convenience library to handle different view types with different presenters in a single RecyclerView.

How to install

repositories {
    maven {
	url "https://jitpack.io"
    }
}

dependencies {
    implementation 'com.github.kibotu:RecyclerViewPresenter:-SNAPSHOT'
}

How to use

1. Create a presenter, e.g. PhotoPresenter or LabelPresenter

class LabelPresenter : Presenter<String, LabelPresenterItemBinding>(
    layout = R.layout.label_presenter_item,
    viewBindingAccessor = LabelPresenterItemBinding::bind
) {

    override fun bindViewHolder(
        viewBinding: LabelPresenterItemBinding,
        viewHolder: RecyclerView.ViewHolder,
        item: PresenterViewModel<String>,
        payloads: MutableList<Any>?
    ) = with(viewBinding) {
        Logger.v( "bindViewHolder ${viewHolder.adapterPosition} $item payload=$payloads" )
        label.text = "${item.model}"
    }
}

2. Add the PresenterAdapter to your RecyclerView

val adapter = PresenterAdapter()
list.adapter = adapter

3. Register Presenter

adapter.registerPresenter(PhotoPresenter())
adapter.registerPresenter(LabelPresenter())
adapter.registerPresenter(NumberPresenter())

4. Submit list of models with presenter matching layout to the adapter, e.g.:

val items = mutableListOf<PresenterViewModel<*>>()

for (i in 0..99) {
    items.add(PresenterModel(createRandomImageUrl(), R.layout.photo_presenter_item))
    items.add(PresenterModel(createRandomImageUrl(), R.layout.label_presenter_item))
    items.add(PresenterModel(createRandomImageUrl(), R.layout.number_presenter_item))
}

adapter.submitList(items)

5.1 Add click listener to adapter

adapter.onItemClick { item, view, position ->
    snack("$position. ${item.model}")
}

5.2 or pass to your RecyclerViewModel

val item = PresenterViewModel(createRandomImageUrl(), R.layout.photo_presenter_item) { item, view, position -> 
	snack("$position. $item")
})

Updating item

adapter.submitList(newItems)

Circular

adapter.isCircular = true

// Note: use adapter scroll methods for correct scroll position when using circular
adapter.smoothScrollToPosition(0)
adapter.scrollToPosition(0)

Notes

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Let me know what you think: jan.rabe@kibotu.net

Contributions welcome!

License

Copyright 2021 Jan Rabe

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.