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: Web Development with Clojure, Third Edition, pg 116
Hi - I just started chapter 5 and I am stuck on page 116 while trying to star...
New
Hi Jamis,
I think there’s an issue with a test on chapter 6. I own the ebook, version P1.0 Feb. 2019.
This test doesn’t pass for me:
...
New
Hi @venkats,
It has been mentioned in the description of ‘Supervisory Job’ title that 2 things as mentioned below result in the same eff...
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: Web Development with Clojure, Third Edition, vB17.0 (p9)
The create table guestbook syntax suggested doesn’t seem to be accepted ...
New
The book has the same “Problem space/Solution space” diagram on page 18 as is on page 17. The correct Problem/Solution space diagrams ar...
New
When installing Cards as an editable package, I get the following error:
ERROR: File “setup.py” not found. Directory cannot be installe...
New
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 “>...
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
I just bought this book to learn about Android development, and I’m already running into a major issue in Ch. 1, p. 20: “Update activity...
New
Other popular topics
Which, if any, games do you play? On what platform?
I just bought (and completed) Minecraft Dungeons for my Nintendo Switch. Other than ...
New
I know that these benchmarks might not be the exact picture of real-world scenario, but still I expect a Rust web framework performing a ...
New
Small essay with thoughts on macOS vs. Linux:
I know @Exadra37 is just waiting around the corner to scream at me “I TOLD YOU SO!!!” but I...
New
“A Mystical Experience” Hero’s Journey with Paolo Perrotta @nusco
Ever wonder how authoring books compares to writing articles?...
New
This is going to be a long an frequently posted thread.
While talking to a friend of mine who has taken data structure and algorithm cou...
New
Was just curious to see if any were around, found this one:
I got 51/100:
Not sure if it was meant to buy I am sure at times the b...
New
Author Spotlight
Mike Riley
@mriley
This month, we turn the spotlight on Mike Riley, author of Portable Python Projects. Mike’s book ...
New
Inside our android webview app, we are trying to paste the copied content from another app eg (notes) using navigator.clipboard.readtext ...
New
Author Spotlight:
Karl Stolley
@karlstolley
Logic! Rhetoric! Prag! Wow, what a combination. In this spotlight, we sit down with Karl ...
New
zig/http.zig at 7cf2cbb33ef34c1d211135f56d30fe23b6cacd42 · ziglang/zig.
General-purpose programming language and toolchain for maintaini...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /erlang
- /phoenix
- /keyboards
- /rails
- /js
- /python
- /security
- /go
- /swift
- /vim
- /clojure
- /emacs
- /haskell
- /java
- /onivim
- /svelte
- /typescript
- /crystal
- /c-plus-plus
- /kotlin
- /tailwind
- /gleam
- /ocaml
- /react
- /elm
- /flutter
- /vscode
- /ash
- /opensuse
- /centos
- /html
- /php
- /deepseek
- /zig
- /scala
- /textmate
- /lisp
- /sublime-text
- /debian
- /nixos
- /react-native
- /agda
- /kubuntu
- /arch-linux
- /revery
- /ubuntu
- /django
- /spring
- /manjaro
- /diversity
- /nodejs
- /lua
- /slackware
- /c
- /julia
- /neovim
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.
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'll move you from confusion to "Aha, now I get it!"