LazyColumn with items in Android Kotlin - UI Render Trace

Component - LazyColumn with items

This UI component shows a vertical list that only creates the visible items on screen. It helps apps run smoothly by loading items as you scroll.

Widget Tree

LazyColumn
└── items (list of Text)

The LazyColumn is the main vertical scrolling list. Inside it, each item is a Text composable showing a string from the list.

Render Trace - 2 Steps

Step 1: LazyColumn

Step 2: items

State Change - Re-render

Trigger:User scrolls the list

Before

Only first few items are composed and displayed

→

After

New items come into view and are composed; old items go out of view and are disposed

Re-renders:Only the visible items inside LazyColumn recompose

UI Quiz - 3 Questions

What does LazyColumn do when you scroll?

A It creates only the items visible on screen

B It creates all items at once

C It stops scrolling automatically

D It hides the list

Key Insight

Using LazyColumn helps apps handle long lists efficiently by only creating what the user sees, saving memory and improving performance.