May 2022
Intermediate to advanced
688 pages
20h 12m
English
book
Android Programming: The Big Nerd Ranch Guide, 5th Edition
by Bryan Sills, Brian Gardner, Kristin Marsicano, Chris Stewart
Content preview from Android Programming: The Big Nerd Ranch Guide, 5th Edition
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27 UI State in Jetpack Compose
Coda Pizza is off to a good start. In the last chapter, you built out a scrollable list, created a composable to act as the cell for toppings, and set up the screen’s layout, including an order button at the bottom of the page. But your app is missing something: Users cannot interact with it (other than scrolling the list of toppings). If users press a checkbox, it does not change from checked to unchecked or vice versa.
This is not what you are used to with framework views. Think back to CriminalIntent, where you used a CheckBox view to track whether a crime was solved. As soon as you added the checkbox to your UI, it responded to click events by toggling its state, with no additional code needed. ...
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