FastAdapter

The RecyclerView is one of the most used widgets in the Android world, and with it you have to implement an Adapter which provides the items for the view. Most use cases require the same base logic, but require you to write everything again and again.

The FastAdapter is here to simplify this process. You don't have to worry about the adapter anymore. Just write the logic for how your view/item should look like, and you are done. This library has a fast and highly optimized core which provides core functionality, most apps require. It also prevents common mistakes by taking away those steps from the devs. Beside being blazing fast, minimizing the code you need to write, it is also really easy to extend. Just provide another adapter implementation, hook into the adapter chain, custom select / deselection behaviors. Everything is possible.

A quick overview:

• Core module 100% in Kotlin
• Click / Long-Click listeners
• Selection / Multi-Selection (MultiselectSample, CheckBoxSample, RadioButtonSample)
• Expandable items (ExpandableSample, IconGridSample ,AdvancedSample)
• Write less code, get better results
• Highly optimized code
• Simple Drag & Drop (SimpleItemListSample)
• Headers (StickyHeaderSample, AdvancedSample)
• Footers
• Filter (SimpleItemListSample)
• Includes suggestions from the Android Team
• Easily extensible
• Endless Scroll (EndlessScrollSample)
• "Leave-Behind"-Pattern (SwipeListSample)
• Split item view and model (ModelItem, MultiTypeModelItem)
• Chain other Adapters (SimpleItemListSample, StickyHeaderSample)
• Comes with useful Helpers
• ActionModeHelper (MultiselectSample)
• UndoHelper (MultiselectSample)
• More to come...
• FastScroller (external lib) (SimpleItemListSample)

Preview

Demo

You can try it out here Google Play (or download the latest release from GitHub)

Screenshots

Include in your project

Latest releases

• Kotlin | v4.0.1
• Java && AndroidX | v3.3.1
• Java && AppCompat | v3.2.9

Using Maven

The library is split up into core, commons, and extensions. The core functions are included in the following dependency.

implementation "com.mikepenz:fastadapter:${latestFastAdapterRelease}"
implementation "androidx.appcompat:appcompat:${androidX}"
implementation "androidx.recyclerview:recyclerview:${androidX}"

Expandable support is included and can be added via this

implementation "com.mikepenz:fastadapter-extensions-expandable:${latestFastAdapterRelease}"
//The tiny Materialize library used for its useful helper classes
implementation "com.mikepenz:materialize:${latestVersion}" // at least 1.2.0

Many helper classes are included in the following dependency.

implementation "com.mikepenz:fastadapter-extensions-diff:${latestFastAdapterRelease}" // diff util helpers
implementation "com.mikepenz:fastadapter-extensions-drag:${latestFastAdapterRelease}" // drag support
implementation "com.mikepenz:fastadapter-extensions-scroll${latestFastAdapterRelease}" // scroll helpers
implementation "com.mikepenz:fastadapter-extensions-swipe:${latestFastAdapterRelease}" // swipe support
implementation "com.mikepenz:fastadapter-extensions-ui:${latestFastAdapterRelease}" // pre-defined ui components
implementation "com.mikepenz:fastadapter-extensions-utils:${latestFastAdapterRelease}" // needs the `expandable`, `drag` and `scroll` extension.

// required for the ui components and the utils
implementation "com.google.android.material:material:${androidX}"
//The tiny Materialize library used for its useful helper classes
implementation "com.mikepenz:materialize:${latestVersion}" // at least 1.2.0

v4.x.y

Major release, migrates fully to Kotlin. Check out the changelog or the [MIGRATION GUIDE](https://github.com/mikepenz/FastAdapter/blob/develop/MIGRATION.md for more details

How to use

1. Implement your item (the easy way)

Just create a class which extends the AbstractItem as shown below. Implement the methods, and your item is ready.

open class SimpleItem : AbstractItem<SimpleItem.ViewHolder>() {
    var name: String? = null
    var description: String? = null

    /** defines the type defining this item. must be unique. preferably an id */
    override val type: Int
        get() = R.id.fastadapter_sample_item_id

    /** defines the layout which will be used for this item in the list  */
    override val layoutRes: Int
        get() = R.layout.sample_item

    override fun getViewHolder(v: View): ViewHolder {
        return ViewHolder(v)
    }

    class ViewHolder(view: View) : FastAdapter.ViewHolder<SimpleItem>(view) {
        var name: TextView = view.findViewById(R.id.material_drawer_name)
        var description: TextView = view.findViewById(R.id.material_drawer_description)

        override fun bindView(item: SimpleItem, payloads: MutableList<Any>) {
            name.text = item.name
            description.text = item.name
        }

        override fun unbindView(item: SimpleItem) {
            name.text = null
            description.text = null
        }
    }
}

2. Set the Adapter to the RecyclerView

//create the ItemAdapter holding your Items
val itemAdapter = ItemAdapter<SimpleItem>()
//create the managing FastAdapter, by passing in the itemAdapter
val fastAdapter = FastAdapter.with(itemAdapter)

//set our adapters to the RecyclerView
recyclerView.setAdapter(fastAdapter)

//set the items to your ItemAdapter
itemAdapter.add(ITEMS)

3. Extensions

By default the FastAdapter only provides basic functionality, which comes with the abstraction of items as Item and Model. And the general functionality of adding/removing/modifying elements. To enable selections, or expandables the provided extensions need to be activated.

3.1. SelectExtension

// Gets (or creates and attaches if not yet existing) the extension from the given `FastAdapter`
val selectExtension = fastAdapter.getSelectExtension()
// configure as needed
selectExtension.isSelectable = true
selectExtension.multiSelect = true
selectExtension.selectOnLongClick = false
// see the API of this class for more options.

3.2. ExpandableExtension

This requires the fastadapter-extensions-expandable extension.

// Gets (or creates and attaches if not yet existing) the extension.
val expandableExtension = fastAdapter.getExpandableExtension()
// configure as needed
expandableExtension.isOnlyOneExpandedItem = true

For further details scroll down to the ExpandableItems (under advanced usage) section.

3. Click listener

fastAdapter.onClickListener = { view, adapter, item, position ->
       // Handle click here
    false
    }

4. Click listeners for views inside your item

//just add an `EventHook` to your `FastAdapter` by implementing either a `ClickEventHook`, `LongClickEventHook`, `TouchEventHook`, `CustomEventHook`
fastAdapter.addEventHook(object : Cl