Epic Adapter

This is an android library for RecyclerView adapters with ViewBinding. With it, you can quickly and easily set up RecyclerView, no more huge adapters! However, the library only works with ViewBinding. You can find out more about it here.

Add the library to a project

// add the JitPack repository in settings.gradle.kts
dependencyResolutionManagement {
    repositories {
        maven("https://jitpack.io")
    }
}

// add the dependency in your build.gradle.kts
dependencies {
    implementation("com.github.epicarchitect:epic-adapter:1.0.9")
}

Simple usage (Similarly used with ViewPager2)

data class MyItem(
    val id: Int,
    val text: String
)

recyclerView.adapter = EpicAdapter {
    setup<MyItem, MyItemBinding>(MyItemBinding::inflate) {
        // optional
        init { item: Lazy<MyItem> ->
            textView.clipToOutline = true // for example
            // add click listeners in init
            buttonAdd.setOnClickListener {
                viewModel.addItem(item.value) // for example
            }
        }

        // there are 4 overloaded methods "bind" here
        bind { item: MyItem ->
            textView.text = item.text
        }
        // or with holder and item
        bind { holder: EpicAdapter.BindingHolder, item: MyItem ->
            textView.text = item.text
        }
        // or with holder, payloads and item
        bind { holder: EpicAdapter.BindingHolder, payloads: List<Any>, item: MyItem ->
            textView.text = item.text
        }
        // or with coroutineScope, holder, payloads and item
        bind { scope: CoroutineScope, holder: EpicAdapter.BindingHolder, payloads: List<Any>, item: MyItem ->
            textView.text = item.text
        }
    }
}

// load the data
val items: List<Any> = listOf(MyItem(1, "item1"), MyItem(2, "item2"))
recyclerView.requireEpicAdapter().loadItems(items)

DiffUtil usage

recyclerView.adapter = EpicAdapter {
    setup<Item, ItemBinding>(ItemBinding::inflate) {
        bind { item ->
            textView.text = item.text
        }

        // diffutils uses the equals function by default, but you can override it:
        diffUtil {
            areItemsTheSame { oldItem, newItem ->
                oldItem.id == newItem.id
            }
            areContentsTheSame { oldItem, newItem ->
                oldItem.text == newItem.text
            }
            payload { oldItem, newItem ->
                if (oldItem.amount != newItem.amount) {
                    UpdateAmount // for example
                } else {
                    null
                }
            }
        }
    }
}

ViewTypes usage

 recyclerView.adapter = EpicAdapter {
    // There are 2 setups for each viewType
    setup<Item1, Item1Binding>(Item1Binding::inflate) {
        bind { item ->
            textView1.text = item.text
        }
    }
    setup<Item2, Item2Binding>(Item2Binding::inflate) {
        bind { item ->
            textView2.text = item.text
        }
    }
}

val items: ArrayList<Any> = ArrayList()
items.add(Item1(text = "viewType1"))
items.add(Item2(text = "viewType2"))

recyclerView.requireEpicAdapter().loadItems(items)

Samples

More examples can be found in the sample directory.