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Android Development Masterclass

Working with RecyclerViews

Explore the core concepts of RecyclerViews in Android development to efficiently display large amounts of data as lists or grids. Learn to define item layouts, create ViewHolders and adapters, and initialize RecyclerViews with layout managers. This lesson guides you through setting up a RecyclerView with a static dataset, helping you understand how to implement fluid, scalable UI components for better app performance.

We'll cover the following...

Introduction

In this lesson, we’ll go over a very specific UI component:. the RecyclerView. A RecyclerView allows us to efficiently display large amounts of data as a grid, list, or any user-defined layout. We only need to specify the data and define the appearance of each item, and the RecyclerView library takes care of creating and displaying the elements when needed.

Define the item layout

First, let’s define a layout for the RecyclerView item. This layout file defines the appearance of each item in the list. For the purpose of the tutorial, we’ll define a simple layout with a TextView. You can define a much more complex UI based on your needs. For example, you could include an image, multiple TextView components, and a button for your item. To keep things simple, let’s just use a TextView.

XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <TextView
        android:id="@+id/rv_textview"
        android:textSize="18sp"
        android:layout_margin="12dp"
        android:textColor="@color/black"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

Define a ViewHolder

The ...