SimpleRecyclerView

SimpleRecyclerView aims to help produce an easily usable implementation of a RecyclerView.Adapter and RecyclerView.ViewHolder

Attribute

name	example	description
dino_items	bind:dino_items="@{vm.itemList}"	Item List to show in RecyclerView
dino_itemLayout	bind:dino_itemLayout="@{@layout/item_main}"	Item Layout to show in RecyclerView
dino_diffCallback	bind:dino_diffCallback="@{(Object)MainItem.Companion}"	DiffUtil.ItemCallback
dino_eventHolder	bind:dino_eventHolder="@{eventHolder}"	Object that has a function for handling event separately from Item
dino_vm	bind:dino_vm="@{vm}"	Object that has a function for handling event separately from Item
dino_viewModel	bind:dino_viewModel="@{viewModel}"	Object that has a function for handling event separately from Item
dino_headerItem	bind:dino_headerItem="@{vm.headerItem}"	Item to show in Header
dino_headerItemLayout	bind:dino_headerItemLayout="@{@layout/item_header}"	Header Layout to show in RecyclerView
dino_footerItem	bind:dino_footerItem="@{vm.footerItem}"	Item to show in Footer
dino_footerItemLayout	bind:dino_footerItemLayout="@{@layout/item_footer}"	Footer Layout to show in RecyclerView
dino_itemSpace	dino_itemSpace="@{@dimen/space}"	Space for each item
dino_itemSpace	dino_itemSpace="@{`8dp`}"	Space for each item
dino_includeEdge	dino_includeEdge="@{true}"	Padding space for RecyclerView
dino_onLoad	dino_onLoad="@{() -> vm.loadItem()}"	Load more items event handling
dino_threshold	dino_threshold="@{10}"	A threshold of remaining items before they've hit the end

Dependency

Then, add the library to your module build.gradle

dependencies {
    implementation 'com.dino.library:simplerecyclerview:x.y.z'
}

Enable DataBinding

SimpleRecyclerView use DataBinding

To configure your app to use data binding, add the dataBinding element to your build.gradle file in the app module (not root build.gradle file), as shown in the following example:

android {
    ...
    buildFeatures {
        dataBinding true
    }
}

Usage

There is a sample. Sample include architectures pattern such as mvp and mvvm.

item_layout.xml

<data>
    <variable
        name="item" <- very important
        type="com.your.package.YourItem"/>
</data>

<TextView
    android:text="@{item.title}"/>
<TextView
    android:text="@{item.content}"/>

if your item name of item_layout.xml is not "item", can't bind item in ViewHolder

RecyclerView.Adapter

<data>
    <import type="java.util.List" />
    <import type="com.your.package.YourItem" />
    <variable
        name="items"
        type="List&lt;YourItem>" />
</data>

...

<androidx.recyclerview.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    bind:dino_itemLayout="@{@layout/item_layout}"
    bind:dino_items="@{items}" />

RecyclerView.SimpleAdapter

<data>
    <import type="java.util.List" />
    <import type="com.your.package.YourItem" />
    <variable
        name="items"
        type="List&lt;YourItem>" />
    <variable
        name="diffCallback"
        type="androidx.recyclerview.widget.DiffUtil.ItemCallback&lt;Object>" />
</data>

...

<androidx.recyclerview.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    bind:dino_diffCallback="@{diffCallback}"
    bind:dino_itemLayout="@{@layout/item_layout}"
    bind:dino_items="@{items}" />

Don't set item, just set adapter

Just set null value in bind:items attribute.

<androidx.recyclerview.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    bind:dino_itemLayout="@{@layout/item_layout}"
    bind:dino_items="@{null}" />

And item set programmatically(Not Recommended)

kotlin

recyclerView.setItems(items)

java

RecyclerViewExtKt.setItems(recyclerView, items)

This method has a timing issue. If you call a setItems function in (onCreate, onStart, onResume), the set of Adapters in the RecyclerView is called afterwards.

MVVM Sample

1. create item_layout.xml

CustomModel is enum class

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="item"
            type="com.dino.simplerecyclerview.model.CustomModel" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{item.title}" />

    </LinearLayout>
</layout>

2. create CustomViewModel

class CustomViewModel : ViewModel() {

    val customModelItems = ObservableField<List<CustomModel>>()

    init {
        createNewItem()
    }

    fun createNewItem() {
        customModelItems.set(CustomModel.values().toList())
    }
}

3. set list item in activity.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:bind="http://schemas.android.com/apk/res-auto">
    <data>
        <variable
            name="vm"
            type="com.dino.simplerecyclerview.ui.CustomViewModel" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <androidx.recyclerview.widget.RecyclerView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            bind:dino_itemLayout="@{@layout/item_layout}"
            bind:dino_items="@{vm.customModelItems}" />

    </LinearLayout>
</layout>

How to handle click listener of item

Deprecated, Use "dino_eventHolder" or "dino_vm" or "dino_viewModel"

1. Add higher-order function to Item class

data class Item(
    val title: String,
    val onClick: (Item) -> Unit
)

2. Add BindingAdapter to root ViewGroup in item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="item"
            type="com.dino.simplerecyclerview.model.Item" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:onClick="@{() -> item.onClick.invoke(item)}"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{item.title}" />

    </LinearLayout>
</layout>

Multi ViewType

Just implement ItemViewType

data class Item1(
    val title: String,
    override val itemLayoutResId: Int = R.layout.item_1
) : ItemViewType

data class Item2(
    val title: String,
    override val itemLayoutResId: Int = R.layout.item_2
) : ItemViewType

AdpaterPosition

Add adapterPosition variable to item layout

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="adapterPosition"
            type="int" />
    </data>

    ...
    
</layout>

License

Copyright 2019 Dino

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.