jskubick

jskubick

Kotlin and Android Development featuring Jetpack: SwitchCompat's thumbTint and trackTint being ignored (page 76)

I think I might have found a problem involving SwitchCompat, thumbTint, and trackTint.

As entered, the SwitchCompat changes color to holo_blue_bright when the switch is enabled and checked, but the colors specified for state_enabled=false and state_checked=false seem to be getting ignored.

I started by changing the first color (state_enabled=false) in ai_toggle_color.xml to holo_red_light, to make it blatantly obvious when it’s being used… then launched it in the Emulator (API 30):

SwitchCompat enabled=false, checked=moot: light gray (vs holo_red_light)

SwitchCompat enabled=true, checked=true: holo_blue_bright, as expected.

SwitchCompat enabled=true, checked=false: dark gray (vs holo_green_light)

Searching around on StackOverflow, I found a few posts that seem to suggest that this might be due to a theme or style overriding the colors set via thumbTint and trackTint.

I tried running the same set of experiments under the emulator using API 27, to see whether it might be due to a recent change in Android’s behavior. Same outcome.

As a final test, I loaded Chapter 3 from the zip archive directly into Android Studio, and ran it as-is in the emulator under API 30… and got the same results as before.

For whatever reason, SwitchCompat appears to be ignoring the color choices set by thumbTint and trackTint unless enabled and checked are both true.

First Post!

rgianassi

rgianassi

Hi everyone,

maybe I found a solution. Here is what I’ve done:

        <androidx.appcompat.widget.SwitchCompat
            android:id="@+id/switch_player_type"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="@={player.isHuman}"
            android:enabled="@{player.isIncluded}"
            android:thumb="@drawable/ai_toggle_bg"
            app:trackTint="@color/ai_toggle_color"
            android:visibility="@{player.canBeToggled ? View.VISIBLE : View.INVISIBLE}"
            app:layout_constraintBottom_toBottomOf="@id/edit_text_player_name"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="@id/edit_text_player_name" />

i.e. I removed the android:thumbTint attribute and I changed android:trackTint to app:trackTint.
Probably some API has been recently changed.

Hope this helps,
Roberto

Where Next?

Popular Pragmatic Bookshelf topics Top

jimmykiang
This test is broken right out of the box… — FAIL: TestAgent (7.82s) agent_test.go:77: Error Trace: agent_test.go:77 agent_test.go:...
New
edruder
I thought that there might be interest in using the book with Rails 6.1 and Ruby 2.7.2. I’ll note what I needed to do differently here. ...
New
Mmm
Hi, build fails on: bracket-lib = “~0.8.1” when running on Mac Mini M1 Rust version 1.5.0: Compiling winit v0.22.2 error[E0308]: mi...
New
AleksandrKudashkin
On the page xv there is an instruction to run bin/setup from the main folder. I downloaded the source code today (12/03/21) and can’t see...
New
brian-m-ops
#book-python-testing-with-pytest-second-edition Hi. Thanks for writing the book. I am just learning so this might just of been an issue ...
New
patoncrispy
I’m new to Rust and am using this book to learn more as well as to feed my interest in game dev. I’ve just finished the flappy dragon exa...
New
nicoatridge
Hi, I have just acquired Michael Fazio’s “Kotlin and Android Development” to learn about game programming for Android. I have a game in p...
New
dsmith42
Hey there, I’m enjoying this book and have learned a few things alredayd. However, in Chapter 4 I believe we are meant to see the “&gt;...
New
EdBorn
Title: Agile Web Development with Rails 7: (page 70) I am running windows 11 pro with rails 7.0.3 and ruby 3.1.2p20 (2022-04-12 revision...
New
New

Other popular topics Top

ohm
Which, if any, games do you play? On what platform? I just bought (and completed) Minecraft Dungeons for my Nintendo Switch. Other than ...
New
siddhant3030
I’m thinking of buying a monitor that I can rotate to use as a vertical monitor? Also, I want to know if someone is using it for program...
New
PragmaticBookshelf
Design and develop sophisticated 2D games that are as much fun to make as they are to play. From particle effects and pathfinding to soci...
New
AstonJ
In case anyone else is wondering why Ruby 3 doesn’t show when you do asdf list-all ruby :man_facepalming: do this first: asdf plugin-upd...
New
PragmaticBookshelf
“A Mystical Experience” Hero’s Journey with Paolo Perrotta @nusco Ever wonder how authoring books compares to writing articles?...
New
DevotionGeo
The V Programming Language Simple language for building maintainable programs V is already mentioned couple of times in the forum, but I...
New
New
New
sir.laksmana_wenk
I’m able to do the “artistic” part of game-development; character designing/modeling, music, environment modeling, etc. However, I don’t...
New
AnfaengerAlex
Hello, I’m a beginner in Android development and I’m facing an issue with my project setup. In my build.gradle.kts file, I have the foll...
New

Sub Categories: