A while ago, I started keeping a list of the canonicals for various questions on Stack Overflow, at least where I found suitable ones for problems that show up often.

This page contains all the various dupes I've found, sorted by categories.

Android

• Changing app type (weak): https://stackoverflow.com/q/64005603/6296561

Inter-app

• Stop other apps: https://stackoverflow.com/q/29887429/6296561

Intra-app

• Activity->activity: https://stackoverflow.com/q/2091465/6296561
• Fragment->activity: https://stackoverflow.com/q/9343241/6296561
• Activity->fragment: https://stackoverflow.com/q/12739909/6296561
• Fragment->fragment in different activities: https://stackoverflow.com/q/16036572/6296561
• Fragment->fragment: https://stackoverflow.com/q/5194548/6296561

Crashing

• It crashed: https://stackoverflow.com/q/23353173/6296561
• Not responding: https://stackoverflow.com/q/704311/6296561

Note that certain exceptions are instead listed as a part of Java

Null

• findViewByID: https://stackoverflow.com/q/19078461/6296561
  • Top-level: https://stackoverflow.com/q/36446114/6296561
  • Null in fragment: https://stackoverflow.com/q/10469283/6296561
• getStringExtra: https://stackoverflow.com/q/15555750/6296561
• Context null (MUST be accompanied by the NPE canonical): https://stackoverflow.com/q/3572463/6296561

Reverse engineering

• Generic: https://stackoverflow.com/q/13854425/6296561

Permissions

• Requesting: https://stackoverflow.com/q/33666071/6296561

General exceptions

• Ninepatch OutOfBounds: https://stackoverflow.com/q/22684868/6296561
• Only the original thread that created a view hierarchy: https://stackoverflow.com/q/5161951/6296561

Data

• Saving: https://stackoverflow.com/q/10962344/6296561

Android Q-related shit

• EACCES: https://stackoverflow.com/q/8854359/6296561
• External storage: https://stackoverflow.com/q/57475704/6296561

Off-topic hammer targets

• Can I use Python: https://stackoverflow.com/q/49955489/6296561

RecyclerView

• Sorting: https://stackoverflow.com/q/45790363/6296561
• Skipping layout: https://stackoverflow.com/q/29141729/6296561

Specific permissions:

API 29

• READ_PRIVILEGED_PHONE_STATE: https://stackoverflow.com/q/62432174/6296561

Platform problems

API 29

• IMEI null: https://stackoverflow.com/q/55173823/6296561
• getExternalStorageDirectory deprecated: https://stackoverflow.com/q/57116335/6296561

Fragments

• findViewByID in fragment: https://stackoverflow.com/q/6495898/6296561

Firebase

• Null after callback: https://stackoverflow.com/q/57330766/6296561

Kotlin

Java interop

• Java objects from Kotlin: https://stackoverflow.com/q/35118514/6296561

Exceptions

See Java for some base exceptions

• Must implement abstract: https://stackoverflow.com/q/44189319/6296561
• Parameter specified as non-null is null: https://stackoverflow.com/q/44885783/6296561

Compile-time errors (JVM)

• Platform declaration conflict with generics: https://stackoverflow.com/q/51580168/6296561
• Java function conflicts with variable getter: https://stackoverflow.com/q/44035263/6296561

Java

Crashing

• It crashed: https://stackoverflow.com/q/3988788/6296561

Generic exceptions

• NullPointer: https://stackoverflow.com/q/218384
• NumberFormat: https://stackoverflow.com/q/39849984/6296561
• StringIndexOutOfBounds: https://stackoverflow.com/q/40006317/6296561
• ArrayIndexOutOfBounds: https://stackoverflow.com/q/5554734/6296561
• ClassCast: https://stackoverflow.com/q/907360/6296561

Apache

• ConnectionPoolTimeoutException: https://stackoverflow.com/q/11875015/6296561

Gson

Begin object

• but was string: https://stackoverflow.com/q/28418662/6296561

Syntax abuse

• Top-level statements: https://stackoverflow.com/q/6151218/6296561

Compile time errors

• Static reference to non-static: https://stackoverflow.com/q/4969171/6296561

Flutter

Flutter --licenses

• NoClassDefFound XmlSchema: https://stackoverflow.com/q/61993738/6296561

Gradle

Generic

• Uses deprecated API: https://stackoverflow.com/q/18311964/6296561

Conflicts

• Find: https://stackoverflow.com/q/21311727/6296561
• Duplicate classes: https://stackoverflow.com/q/56029393/6296561
• Exclude package: https://stackoverflow.com/q/30942825/6296561

Android Studio

M1

• Generic: https://stackoverflow.com/q/64906525/6296561
• Emulator: https://stackoverflow.com/q/64907154/6296561

Meta reasons

• App stores: https://meta.stackoverflow.com/q/272165/6296561
• Customer: https://meta.stackoverflow.com/q/255745/6296561
• Images: https://meta.stackoverflow.com/q/285551/6296561
• Answering trash: https://meta.stackoverflow.com/q/276572/6296561

Vim

• Exit: https://stackoverflow.com/q/11828270/6296561

Nvim

• Window options can't be set: https://stackoverflow.com/q/66943771/6296561

C++

Linking

• Undefined reference: https://stackoverflow.com/q/12573816/6296561

Meta

• Political display name: https://meta.stackoverflow.com/a/349167/6296561