dachristenson
Kotlin and Android Development featuring Jetpack: End Ch. 11 app runs but consistently crashes
I’ve got to the end of Ch. 11, and the app runs, with all tabs displaying what they should – at first. After switching around between Standings, Players, Leaders, etc., the app always eventually has problems reloading, for instance, Standings. Then, I’ll try to load Leaders, and it crashes with this error (as far as I can tell, it’s always mentioning the LeadersListFragment). Is this due to the “experimental” status of some of the packages imported, or is it something else? It happens on both my Samsung tablet and on the virtual Pixel 3a.
FATAL EXCEPTION: main
Process: com.example.abl, PID: 13592
androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.abl.leaders.LeadersListFragment: could not find Fragment constructor
at androidx.fragment.app.Fragment.instantiate(Fragment.java:687)
at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57)
at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:525)
at androidx.fragment.app.FragmentState.instantiate(FragmentState.java:84)
at androidx.fragment.app.FragmentStateManager.<init>(FragmentStateManager.java:91)
at androidx.fragment.app.FragmentManager.restoreSaveStateInternal(FragmentManager.java:2562)
at androidx.fragment.app.Fragment.restoreChildFragmentState(Fragment.java:1988)
at androidx.fragment.app.Fragment.onCreate(Fragment.java:1967)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:3094)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:504)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:268)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1943)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1845)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1782)
at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:565)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8653)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
Caused by: java.lang.NoSuchMethodException: com.example.abl.leaders.LeadersListFragment.<init> []
at java.lang.Class.getConstructor0(Class.java:2332)
at java.lang.Class.getConstructor(Class.java:1728)
at androidx.fragment.app.Fragment.instantiate(Fragment.java:672)
at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57)
at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:525)
at androidx.fragment.app.FragmentState.instantiate(FragmentState.java:84)
at androidx.fragment.app.FragmentStateManager.<init>(FragmentStateManager.java:91)
at androidx.fragment.app.FragmentManager.restoreSaveStateInternal(FragmentManager.java:2562)
at androidx.fragment.app.Fragment.restoreChildFragmentState(Fragment.java:1988)
at androidx.fragment.app.Fragment.onCreate(Fragment.java:1967)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:3094)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:504)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:268)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1943)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1845)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1782)
at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:565)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8653)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
2023-12-06 14:58:29.915 13592-13592 Process com.example.abl I Sending signal. PID: 13592 SIG: 9
Marked As Solved
mfazio23
Author of Kotlin and Android Development featuring Jetpack
Alright, this took me a bit since my original app still works as written, so I’m thinking this is due to a change in one of the navigation library. It’s seems like it’s trying to be helpful and re-create your Fragment automatically, but since it doesn’t know the leaderType it can’t.
I’d say the proper approach here is to send the leaderType as an argument to the LeadersListFragment rather than as a constructor parameter:
val leaderType = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
arguments?.getSerializable(LEADER_TYPE_KEY, LeaderType::class.java)
} else {
arguments?.getSerializable(LEADER_TYPE_KEY) as? LeaderType
} ?: LeaderType.Batting
You can then remove leaderType from the constructor. Note that the extra version check logic is due to arguments?.getSerializable(LEADER_TYPE_KEY) being deprecated for API level 33, but our app supports lower versions.
You can also do this the easy way and make the constructor parameter nullable:
class LeadersListFragment(private val leaderType: LeaderType? = LeaderType.Batting)
Sorry this took a bit for me to get back to you!
Popular Pragmatic Bookshelf topics
Title: Design and Build Great Web APIs - typo “https://company-atk.herokuapp.com/2258ie4t68jv” (page 19, third bullet in URL list)
Typo:...
New
Title: Web Development with Clojure, Third Edition - migrations/create not working: p159
When I execute the command:
user=> (create-...
New
Hi @Margaret ,
On page VII the book tells us the example and snippets will be all using Elixir version 1.11
But on page 3 almost the en...
New
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
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
Title: Build a Weather Station with Elixir and Nerves: Problem connecting to Postgres with Grafana on (page 64)
If you follow the defau...
New
It seems the second code snippet is missing the code to set the current_user:
current_user: Accounts.get_user_by_session_token(session["...
New
Modern Front-End Development for Rails - application does not start after run bin/setup (page xviii)
After some hassle, I was able to finally run bin/setup, now I have started the rails server but I get this error message right when I vis...
New
Hello faithful readers! If you have tried to follow along in the book, you are asked to start up the dev environment via dx/build and ar...
New
Is there any plan for volume 2? :slight_smile:
New
Other popular topics
Bought the Moonlander mechanical keyboard. Cherry Brown MX switches. Arms and wrists have been hurting enough that it’s time I did someth...
New
I’ve been hearing quite a lot of comments relating to the sound of a keyboard, with one of the most desirable of these called ‘thock’, he...
New
Tailwind CSS is an exciting new CSS framework that allows you to design your site by composing simple utility classes to create complex e...
New
Think Again 50% Off Sale »
The theme of this sale is new perspectives on familiar topics.
Enter coupon code ThinkAgain2021 at checkout t...
New
Intensively researching Erlang books and additional resources on it, I have found that the topic of using Regular Expressions is either c...
New
Saw this on TikTok of all places! :lol:
Anyone heard of them before?
Lite:
New
Biggest jackpot ever apparently! :upside_down_face:
I don’t (usually) gamble/play the lottery, but working on a program to predict the...
New
Build efficient applications that exploit the unique benefits of a pure functional language, learning from an engineer who uses Haskell t...
New
Inside our android webview app, we are trying to paste the copied content from another app eg (notes) using navigator.clipboard.readtext ...
New
I’m able to do the “artistic” part of game-development; character designing/modeling, music, environment modeling, etc.
However, I don’t...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /ruby
- /wasm
- /erlang
- /phoenix
- /keyboards
- /python
- /js
- /rails
- /security
- /go
- /swift
- /vim
- /clojure
- /emacs
- /haskell
- /java
- /svelte
- /onivim
- /typescript
- /kotlin
- /c-plus-plus
- /crystal
- /tailwind
- /react
- /gleam
- /ocaml
- /flutter
- /elm
- /vscode
- /ash
- /html
- /opensuse
- /zig
- /centos
- /deepseek
- /php
- /scala
- /react-native
- /textmate
- /lisp
- /sublime-text
- /nixos
- /debian
- /agda
- /django
- /kubuntu
- /arch-linux
- /deno
- /nodejs
- /revery
- /ubuntu
- /manjaro
- /spring
- /lua
- /diversity
- /markdown
- /julia
- /c
Devtalk Sponsors
Practical resources that improve the lives of professional developers.
We build trusted fault-tolerant systems that scale to billions of users.
Real-time error tracking, performance insights, and observability for devs.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Develop your skills with books, videos, and courses.
Catch errors, track performance, monitor hosts and more.
Enabling companies to succeed by building software people love.
Courses that move you from confusion to "Aha, now I get it!"