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Fixes part of #4120, part of #1051: Fix a lot of build-time warnings #5402

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merged 149 commits into from
Jun 3, 2024

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@BenHenning BenHenning commented May 22, 2024

Explanation

Fixes part of #4120
Fixes part of #1051

Similar to #5400, this brings forward changes that would otherwise go in #4937 to simplify the transition to Kotlin 1.6.

Part of #4937 is introducing warnings-as-errors for both Kotlin and Java in order to reduce developer error, simplify the codebase, and minimize warnings when building (which can result in developer habits of ignoring warnings that might have real consequences to end users of the app). In order to keep the main migration PR smaller, this PR fixes all existing warnings and any new ones detected with the Kotlin 1.6 compiler that are not tied to Kotlin 1.5/1.6 API changes (those are part of #4937, instead). Fortunately, most of the changes could be brought forward into this PR.

Specific things to note:

  • A few new issues were filed for SDK 33 deprecations caused, but not noted by, Fix #5137: Upgrade builds to target SDK 33 #5222): [Feature Request]: Migrate away from onBackPressed() #5404, [Feature Request]: Replace type-ambiguous (and now deprecated) Bundle calls #5405, and [Feature Request]: Migrate keyboard hiding functionality #5406 and corresponding TODOs added. This PR opts for TODOs over actual fixes to minimize the amount of manual verification needed, and to try and keep the PR more focused on non-functional refactor changes (to reduce the risk as reverting this PR may be difficult if an issue is introduced).
  • A lot of the fixes were removing redundant casts or null checks.
  • The old mechanism we used for view models is deprecated, and had a lot of problems (partially documented in Come up with long-term strategy for managing view data management #1051). This PR moves the codebase over to directly injecting view models instead of using the view model provider (thus getting rid of true Jetpack view models entirely in the codebase).
    • We never used the Jetpack functionality, and we were leaking a lot of context objects that could theoretically result in memory leaks.
    • The migration of view models in this way has already been ongoing in the codebase; this PR just finishes moving the rest of them over to remove the deprecated JetPack view model reference.
    • Note that this doesn't actually change the scope of the view models, and in fact they should largely behave as they always have.
    • ObservableViewModel was subsequently updated, and may be something we could remove in the future now that it's no longer a Jetpack view model.
    • The old view model binding code was removed, along with its test file exemptions. It's no longer used now that the view models have been finished being migrated over to direct injection.
  • Some of the binding adapters didn't correctly correspond to their namespaced properties. I think that the databinding compiler was still hooking them up correctly, but they produced build warnings that have now been addressed (specifically, 'app' is implied). Some other properties were using unusual namespaces, so these were replaced with 'app' versions for consistency & correctness.
  • Some cases where SAM interfaces could be converted to lambdas were also addressed (mainly for Observer callbacks in UI code).
  • DrawerLayout.setDrawerListener was replaced with calls to DrawerLayout.addDrawerListener since the former is deprecated. This isn't expected to have a functional difference.
  • Some other minor control flow warnings were addressed (such as dead code paths).
  • when cases were updated to be comprehensive (as this is enforced starting in newer versions of Kotlin even for non-result based when statements).
  • Some unused variables were removed and/or replaced with _ per Kotlin convention.
  • Some parameter names needed to be updated to match their override signatures.
  • One change in ExitSurveyConfirmationDialogFragment involved removing parsing a profile ID. Technically this is a semantic change since now a crash isn't going to happen if the profile ID is missing or incorrect, but that seems fine since the fragment doesn't even need a profile ID to be passed.
  • Some of the test activities were updated to bind a Runnable callback rather than binding to a method (just to avoid passing the unused View parameter and to keep things a bit simple binding-wise).
  • Some cases were fixed where variables were being shadowed due to reused names in deeper scopes.
  • There were some typing issues going on in tests with custom test application components. This has been fixed by explicitly declaring the application component types rather than them being implicit within the generated Dagger code.
  • getDrawable calls were updated to pass in a Theme since the non-theme version is deprecated.
  • Some Java property references were updated, too (i.e. using property syntax instead of Java getters when referencing Java code in Kotlin).
  • In some cases, deprecated APIs were suppressed since they're needed for testing purposes.
  • Mockito's verifyZeroInteractions has been deprecated in favor of verifyNoMoreInteractions, so updates were made in tests accordingly.
  • ExperimentalCoroutinesApi and InternalCoroutinesApi have been deprecated in favor of a newer OptIn method (which can actually be done via kotlinc arguments, but not in this PR). Thus, they've been outright removed in cases where not needed, and otherwise migrated to the OptIn approach where they do need to be declared.
  • In some cases, Kotlin recommends using a toSet() conversion for iterable operations when it's more performant, so some of those cases (where noticed) have been addressed.
  • Some unused parameter cases needed to be suppressed for situations when Robolectric is using reflection to access them.
  • In some cases Android Studio would recommend transformation chain simplifications; these were adopted where obvious.
  • There are a few new TODOs added on Migrate all non-test Android API deprecated references to the replacement versions with proper gating logic #3616 as well, to clean up deprecated references that have been suppressed in this PR.
  • BundleExtensions was updated to implement its own version of the type-based getSerializable until such time as BundleCompat can be used, instead (per [Feature Request]: Replace type-ambiguous (and now deprecated) Bundle calls #5405).
  • A lot of nullability improvements needed to happen throughout the JSON asset loading process since there was a lot of loose typing happening there.
  • Some Kotlin & OkHttp deprecated API references were also updated to use their non-deprecated replacements.
  • NetworkLoggingInterceptorTest was majorly reworked to ensure that the assertions would actually run (runBlockingTest was being used which is deprecated, and something I try to avoid since it's very difficult to write tests that use it correctly). My investigations showed that the assertions weren't being called, so these tests would never fail. The new versions will always run the assertions or fail before reaching them, and fortunately the code under test passes the assertions correctly. Ditto for ConsoleLoggerTest.
  • Some parts of SurveyProgressController were reworked to have better typing management and to reduce the need for nullability management.
  • Some generic typing trickiness needed to be fixed ahead of the Kotlin version upgrade in UrlImageParser. See file comments & links in those comments for more context.
  • BundleExtensionsTest had to be changed since getSerializableExtra is now deprecated. We also can't update the test to run SDK 33 since that requires upgrading Robolectric, and Robolectric can't be upgraded without upgrading other dependencies that eventually lead to needing to upgrade both Kotlin and Bazel (so it's a non-starter; this is a workaround until we can actually move to a newer version of Robolectric).
  • There was some minor code-deduplication & cleanup done in ClickableAreasImage.
  • Some incorrect comments were removed in tests (to the effect of "using not-allowed-listed variables should result in a failure."). These seemed to have been copied from an earlier test, but the later tests weren't actually verifying that behavior so the comment wasn't correct.
  • An unused method was removed from ConceptCardRetriever (createWrittenTranslationFromJson) and some other small cleanup/consolidation work happened in that class.
  • Some stylistic changes were done in TopicController for JSON loading to better manage nullable situations, and to try and make the JSON loading code slightly more Kotlin idiomatic.

Note that overall the PR has relied heavily on tooling to detect warnings to fix, and automated tests to verify that the changes have no side effects.

Note also that this PR does not actually enable warnings-as-errors; that will happen in a downstream PR.

Essential Checklist

  • The PR title and explanation each start with "Fix #bugnum: " (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
  • Any changes to scripts/assets files have their rationale included in the PR explanation.
  • The PR follows the style guide.
  • The PR does not contain any unnecessary code changes from Android Studio (reference).
  • The PR is made from a branch that's not called "develop" and is up-to-date with "develop".
  • The PR is assigned to the appropriate reviewers (reference).

For UI-specific PRs only

N/A -- While this changes UI code, it should change very few UI behaviors and only failure cases for those it does affect. It's largely infrastructural-only and falls mainly under refactoring/cleanup work.

BenHenning and others added 30 commits March 27, 2023 13:36
The check & related scripts required fairly involved reworking since the
Maven install file (from which it sources Maven URL context) changed in
format as part of the upgrade for rules_jvm_external. This has actually
led to what seems to be more correct analysis of libraries that the
build depends on, so more licenses have been added to the
maven_dependencies.textproto tracking file.

One unused Crashlytics dependency was removed since it was referencing
an old license that doesn't exist anymore (and the artifact should be
replaced in full by more recent Firebase Crashlytics dependencies that
we are already using).
This addresses an underlying bug with the command executor that can, in
some cases, break compute_affected_tests. It also refines some of its
internal mechanisms for much better performance on expensive PRs.

It also prepares the base support needed for merge queues, but the
CI workflows aren't being updated in this change.
This prepares for merge queues (but doesn't quite configure the workflow
for them--that will happen in a different PR), and improves how tests
are computed for stacked PRs.
…xternal

Conflicts:
	scripts/src/java/org/oppia/android/scripts/common/BUILD.bazel
	scripts/src/java/org/oppia/android/scripts/license/MavenDependenciesListCheck.kt
	scripts/src/java/org/oppia/android/scripts/license/MavenDependenciesRetriever.kt
	scripts/src/java/org/oppia/android/scripts/maven/GenerateMavenDependenciesList.kt
	scripts/src/javatests/org/oppia/android/scripts/license/MavenDependenciesListCheckTest.kt
	scripts/src/javatests/org/oppia/android/scripts/license/MavenDependenciesRetrieverTest.kt
	scripts/src/javatests/org/oppia/android/scripts/maven/GenerateMavenDependenciesListTest.kt
Also, update TODO check script to have nicer output, and support
generating the exemption textproto file for easier updates in the
future.
This moves the codebase to using the recommended single top-level Dagger
library rather than replicating it in a bunch of different places.
This is needed for downstream work. It also includes ensuring that Guava
JRE can never be used (since only Android should ever be referenced by
the production app build).
The new proto target isn't used anywhere so this was missed.
Conflicts:
	scripts/assets/todo_open_exemptions.textproto
…xternal

Conflicts:
	scripts/assets/test_file_exemptions.textproto
	third_party/maven_install.json
Conflicts:
	app/src/main/java/org/oppia/android/app/translation/BUILD.bazel
	third_party/maven_install.json
These issues were found after I started using a new development
environment.
ProfileAndDeviceIdFragmentTest had been updated to use a newer fragment
initialization pattern, but that's no longer needed and seems to be
causing what appears to be timing discrepancies between local dev and
CI.
The issue ultimately arose from test parameters being initialized after
they're needed in the launched UI. This type of change was tried earlier
in the branch, but reverted since it didn't seem necessary. It is,
however, necessary when there are environment differences (e.g. local
vs. CI) or when running certain tests individually.

Due to the difficulty in finding this issue, ActivityScenarioRule has
been added as a prohibited pattern in the static regex checks (along
with ActivityTestRule since that's deprecated and discouraged, anyway).
Conflicts:
	domain/src/main/java/org/oppia/android/domain/topic/PrimeTopicAssetsControllerImpl.kt
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Self-reviewed latest changes. No specific concerns.

I left replies to your comments and added one change to address one of them, plus pulled in the latest develop changes. PTAL @adhiamboperes.

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Everything looks good, thanks @BenHenning!

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oppiabot bot commented May 30, 2024

Unassigning @adhiamboperes since they have already approved the PR.

@oppiabot oppiabot bot added the PR: LGTM label May 30, 2024
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oppiabot bot commented May 30, 2024

Hi @BenHenning, this PR is ready to be merged. Please address any remaining comments prior to merging, and feel free to merge this PR once the CI checks pass and you're happy with it. Thanks!

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@seanlip PTAL for owners-specific changes.

@seanlip seanlip removed the request for review from a team May 30, 2024 19:09
@seanlip seanlip removed their assignment May 30, 2024
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seanlip commented May 30, 2024

@BenHenning Owners approval does not seem to be required for this PR, unless I'm missing something?

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Hmm not sure why I saw that originally @seanlip. Thanks for double checking!

Thanks @adhiamboperes for the review!

Enabling auto-merge now that this is up-to-date with the latest develop changes.

@BenHenning BenHenning enabled auto-merge (squash) June 3, 2024 19:58
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Reviewed latest merge. No conflicts so the merge went in cleanly.

@BenHenning BenHenning merged commit 3a369ed into develop Jun 3, 2024
41 checks passed
@BenHenning BenHenning deleted the fix-build-time-kotlin-java-warnings branch June 3, 2024 20:44
@BenHenning BenHenning restored the fix-build-time-kotlin-java-warnings branch June 11, 2024 21:26
@BenHenning BenHenning deleted the fix-build-time-kotlin-java-warnings branch June 11, 2024 21:26
adhiamboperes added a commit that referenced this pull request Jun 12, 2024
## Explanation
Fixes #4119
Fixes #4120
Fixes part of #59

This PR finishes the migration of the codebase to Kotlin 1.6 (addressing
both #4119 and #4120).

Kotlin 1.6 is needed as part of moving rules_kotlin to 1.7.x (which is,
in turn, needed in conjunction with Bazel 6.x to enable strict
dependency checking which significantly simplifies modularization which
is planned for downstream PRs). This PR doesn't actually finish the
movement to that version of rules_kotlin, but it does finish moving the
codebase to a new enough (and no longer pre-release) version of
rules_kotlin to allow using Kotlin 1.6 (over Kotlin 1.4 that the
codebase currently uses): version 1.5.0.

Previous PRs (#5400 and #5402) prepared for the changes here by
addressing large categories of build warnings that have either arisen
from this migration, or from past work. Note that another large category
of warnings have also been addressed in this PR: by moving to Kotlin
1.6, there's no longer a runtime incompatibility between the Kotlin SDK
and the reflection APIs (which was causing a _lot_ of warning output
previously). Between all three PRs, the output is now very clean and
free of nearly all build warnings.

To try and keep the warnings clean long-term, this PR introduces
warnings-as-errors for both Java and Kotlin code. However, please note
some caveats:
- Dagger generated code doesn't follow the Java warnings-as-error flag,
so those warnings were cleaned up manually (and will need to be
generally watched for, unfortunately).
- The version of rules_kotlin used in this PR doesn't directly support
turning on the functionality, but does internally (so a small patch file
has been added to augment rules_kotlin). When the codebase is updated to
rules_kotlin 1.7.x this patch will no longer be needed.
- To ease development, a build configuration flag was added to disable
failure upon encountering build warnings (per
https://bazel.build/run/bazelrc and
https://bazel.build/docs/configurable-attributes#query-and-cquery as an
example), though this needs to be opted into:
  ```sh
  bazel build --config=ignore_build_warnings <target>
  ```

Some other details to note:
- Version 1.6.10 is specifically picked in order to ensure Jetpack
Compose compatibility (for preparation of the work being prototyped in
#5401 to be compatible with the Oppia Android build environment).
- The vast majority of code in this PR is updating parameterized tests
to use a cleaner repeatable annotation pattern that wasn't available in
Kotlin 1.4.
- This upgrade absolutely does have runtime implications, but we're
relying very heavily on existing automated tests to ensure correctness
and no regressions.
- This PR doesn't make an effort to move toward newer Kotlin language
features except where forced (API deprecations) or largely wanted (the
repeatable annotation change).
- android-spotlight and kotlitex have been updated to support newer
versions of Kotlin (as both are custom forks managed in the broader
Oppia GitHub organization).
- Gradle files have been updated to match the same dependency versions
as Bazel (where it was obvious to make changes; some might still be a
bit off).
- The Gradle build configuration was also updated to use Kotlin 1.6.x
(otherwise there would be build incompatibilities with Bazel). I think
this is the last upgrade we can do for Gradle without upgrading AGP
(which will cause us significant issues with the model module, so we're
planning on instead dropping Gradle support).
- API changes that needed to be addressed in this PR due to deprecations
include: ``String.captialize``, ``String.toLowerCase``,
``String.toUpperCase``, ``SendChannel.offer``, and ``Char.toInt``.
- New API changes that have been leveraged in this PR:
``Flow.lastOrNull`` and ``Deferred.asListenableFuture`` (to replace
``SettableFuture`` for safety; this also resulted in nice
simplifications in ``CoroutineExecutorService``).
- The JVM coroutines dependency needed to be split out from Maven and
manually imported with some empty internal Java class files since it
otherwise has some issues being desugared:
bazelbuild/bazel#13553. This is a problem with
the Desugarer used in Bazel 4.x (and maybe later versions, so this
solution will probably need to kept for a while).
- Some Proguard rule updates were needed due to Kotlin SDK changes--see
the Proguard file & comments for specifics.
- Due to dependency changes, the KitKat main dex file was also trimmed
down. I'm fairly certain that it's already crashing on startup, so I
don't care much about this change--it just needs to build. We plan to
remove KitKat entirely eventually, anyway: #5012.
- Jetifier (that is, automatic conversion from support libraries to
Jetpack/AndroidX) support was disabled in Gradle. We don't have it
enabled in Bazel, and it could potentially encourage strange one-version
violations if it was ever actually needed. This is a safer (and likely
more performant) change to make.
- Moshi was updated to 1.13 to support the upgrade in Kotlin. This did
result in a small configuration change due to its annotation processor
being moved. Note that Moshi 1.14 couldn't be supported since it
requires Kotlin 1.7+ which requires rules_kotlin 1.7+. This will be an
option to upgrade in the future.
- Some improvements and fixes were made in
``FilterPerLanguageResources`` (I think it was outputting something
incorrectly before and that's now been fixed as part of a broader
logical reworking of the filtering logic).
- ``com.android.support:support-annotation`` was removed as a dependency
since it was never used in Bazel, and shouldn't be used (since it's
support library and not AndroidX).
- The updates to Moshi and Kotlin dependencies resulted in a bunch of
other transitive dependency updates.
- Note that Gradle doesn't have ``allWarningsAsErrors`` enabled since it
would require fixing more warnings than is exposed in Bazel, and we're
using Bazel builds as the general source of truth for code quality.

## Essential Checklist
- [x] The PR title and explanation each start with "Fix #bugnum: " (If
this PR fixes part of an issue, prefix the title with "Fix part of
#bugnum: ...".)
- [x] Any changes to
[scripts/assets](https://github.com/oppia/oppia-android/tree/develop/scripts/assets)
files have their rationale included in the PR explanation.
- [x] The PR follows the [style
guide](https://github.com/oppia/oppia-android/wiki/Coding-style-guide).
- [x] The PR does not contain any unnecessary code changes from Android
Studio
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#undo-unnecessary-changes)).
- [x] The PR is made from a branch that's **not** called "develop" and
is up-to-date with "develop".
- [x] The PR is **assigned** to the appropriate reviewers
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#clarification-regarding-assignees-and-reviewers-section)).

## For UI-specific PRs only
N/A -- This is an infrastructural change. While it could inadvertently
affect user-facing code, it shouldn't based on the current passing state
of automated tests.

---------

Co-authored-by: Adhiambo Peres <[email protected]>
Co-authored-by: Sean Lip <[email protected]>
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