⚡ [performance improvement] Optimize TextUtils.equals with String.contentEquals#269
⚡ [performance improvement] Optimize TextUtils.equals with String.contentEquals#269sheepdestroyer wants to merge 5 commits into
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Co-authored-by: sheepdestroyer <1377479+sheepdestroyer@users.noreply.github.com>
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📝 WalkthroughWalkthroughModernizes Android APIs, applies system window insets, updates layouts to match_parent, pre-compiles regexes, switches mixed CharSequence equality to ChangesJava Performance & Equality Optimization
Android API Modernization
Fullscreen ViewModel Migration
Build & Dependency Updates
Sequence Diagram(s)sequenceDiagram
participant onPostCreate
participant ViewCompat
participant InsetListener as setOnApplyWindowInsetsListener
participant RootView
onPostCreate->>RootView: locate root content view
onPostCreate->>ViewCompat: register window insets listener
ViewCompat->>InsetListener: invoke on apply window insets
InsetListener->>RootView: update padding from system bar insets
InsetListener->>ViewCompat: request insets
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Possibly related PRs
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🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
⚔️ Resolve merge conflicts
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Up to standards ✅🟢 Issues
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| Metric | Results |
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| Duplication | 0 |
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Code Review Summary
| Analyzer | Status | Updated (UTC) | Details |
|---|---|---|---|
| Kotlin |  |
May 20, 2026 8:26p.m. | Review ↗ |
| Java |  |
May 20, 2026 8:26p.m. | Review ↗ |
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Code Review
This pull request optimizes CharSequence comparison in AndroidUtils.java by utilizing String.contentEquals() when either operand is a String, which improves performance by leveraging JVM intrinsics and avoiding toString() allocations. Additionally, documentation was added to .jules/bolt.md detailing these optimization benefits. I have no feedback to provide.
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I have successfully resolved the merge conflicts and rebased the branch on top of |
Co-authored-by: sheepdestroyer <1377479+sheepdestroyer@users.noreply.github.com>
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In
`@app/src/main/java/io/github/sheepdestroyer/materialisheep/widget/NavFloatingActionButton.java`:
- Around line 85-89: The code assumes the vibrator service and vibrator instance
are non-null; update the NavFloatingActionButton constructor to null-check the
result of context.getSystemService(Context.VIBRATOR_MANAGER_SERVICE) before
calling getDefaultVibrator() and set mVibrator to null if the service is
missing, and then wrap every vibration use (references to mVibrator in the
vibration calls currently around the blocks using mVibrator.vibrate — e.g.,
where vibration is triggered at the show/hide/press handlers) with a guard like
if (mVibrator != null) ... so no vibration method is invoked on a null
mVibrator; ensure checks reference VibratorManager and mVibrator to locate the
changes.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
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Plan: Pro
Run ID: 7801436e-c94b-46ba-8140-6e4bb619b24f
📒 Files selected for processing (17)
.jules/bolt.mdapp/src/main/java/io/github/sheepdestroyer/materialisheep/AndroidUtils.javaapp/src/main/java/io/github/sheepdestroyer/materialisheep/accounts/UserServicesClient.javaapp/src/main/java/io/github/sheepdestroyer/materialisheep/widget/NavFloatingActionButton.javaapp/src/main/res/layout/activity_about.xmlapp/src/main/res/layout/activity_compose.xmlapp/src/main/res/layout/activity_feedback.xmlapp/src/main/res/layout/activity_item.xmlapp/src/main/res/layout/activity_list.xmlapp/src/main/res/layout/activity_login.xmlapp/src/main/res/layout/activity_offline_web.xmlapp/src/main/res/layout/activity_preferences.xmlapp/src/main/res/layout/activity_release.xmlapp/src/main/res/layout/activity_settings.xmlapp/src/main/res/layout/activity_submit.xmlapp/src/main/res/layout/activity_thread_preview.xmlapp/src/main/res/layout/activity_user.xml
| VibratorManager vibratorManager = | ||
| (VibratorManager) context.getSystemService(Context.VIBRATOR_MANAGER_SERVICE); | ||
| mVibrator = vibratorManager.getDefaultVibrator(); | ||
| } else { | ||
| mVibrator = null; |
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🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
set -euo pipefail
# 1) Confirm declared minSdk/targetSdk in Gradle files
rg -n --glob '**/build.gradle*' 'minSdk|minSdkVersion|targetSdk|targetSdkVersion|compileSdk'
# 2) Confirm no SDK guards currently exist around the new APIs in this class
rg -n -C3 'VibratorManager|VibrationEffect|Build\.VERSION\.SDK_INT|VERSION_CODES\.(O|S)|VIBRATOR_SERVICE' app/src/main/java/io/github/sheepdestroyer/materialisheep/widget/NavFloatingActionButton.javaRepository: sheepdestroyer/materialisheep
Length of output: 1990
Add null checks for vibrator service and handle potential null vibrator.
The code obtains VibratorManager via getSystemService() at line 85 without null-checking it before calling getDefaultVibrator(). While VibratorManager is available at the project's minSdkVersion (31), the service lookup can still return null. Additionally, all vibration calls at lines 157–160, 187–190, and 226–229 use mVibrator without null guards. Add null checks for both the service and the vibrator field before use.
Suggested patch
if (!isInEditMode()) {
VibratorManager vibratorManager =
(VibratorManager) context.getSystemService(Context.VIBRATOR_MANAGER_SERVICE);
- mVibrator = vibratorManager.getDefaultVibrator();
+ mVibrator = vibratorManager != null ? vibratorManager.getDefaultVibrator() : null;
} else {
mVibrator = null;
}
@@
- if (mVibrationEnabled) {
+ if (mVibrationEnabled && mVibrator != null) {
mVibrator.vibrate(
VibrationEffect.createOneShot(
VIBRATE_DURATION_MS, VibrationEffect.DEFAULT_AMPLITUDE));
}
@@
- if (mVibrationEnabled) {
+ if (mVibrationEnabled && mVibrator != null) {
mVibrator.vibrate(
VibrationEffect.createOneShot(
VIBRATE_DURATION_MS * 2, VibrationEffect.DEFAULT_AMPLITUDE));
}
@@
- if (mVibrationEnabled) {
+ if (mVibrationEnabled && mVibrator != null) {
mVibrator.vibrate(
VibrationEffect.createWaveform(
new long[] {0, VIBRATE_DURATION_MS * 2, 100, VIBRATE_DURATION_MS * 2}, -1));
}Also applies to: 157–160, 187–190, 226–229
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In
`@app/src/main/java/io/github/sheepdestroyer/materialisheep/widget/NavFloatingActionButton.java`
around lines 85 - 89, The code assumes the vibrator service and vibrator
instance are non-null; update the NavFloatingActionButton constructor to
null-check the result of
context.getSystemService(Context.VIBRATOR_MANAGER_SERVICE) before calling
getDefaultVibrator() and set mVibrator to null if the service is missing, and
then wrap every vibration use (references to mVibrator in the vibration calls
currently around the blocks using mVibrator.vibrate — e.g., where vibration is
triggered at the show/hide/press handlers) with a guard like if (mVibrator !=
null) ... so no vibration method is invoked on a null mVibrator; ensure checks
reference VibratorManager and mVibrator to locate the changes.
|
@jules — This PR has merge conflicts (DIRTY). Please rebase on master and resolve conflicts. Let me know when fixed. |
I have rebased on master and successfully resolved the merge conflicts. The PR is now clean and up-to-date. |
Co-authored-by: sheepdestroyer <1377479+sheepdestroyer@users.noreply.github.com>
There was a problem hiding this comment.
Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In
`@app/src/main/java/io/github/sheepdestroyer/materialisheep/ThemedActivity.java`:
- Around line 78-80: The current ViewCompat.setOnApplyWindowInsetsListener
callback on the content root replaces any pre-existing padding by calling
v.setPadding(insets.left, insets.top, insets.right, insets.bottom); change this
to preserve existing padding: read the view's current padding
(v.getPaddingLeft(), getPaddingTop(), getPaddingRight(), getPaddingBottom()) and
add the corresponding Insets values (Insets.left/top/right/bottom) before
calling v.setPadding(...). Update the listener in ThemedActivity (the lambda
passed to ViewCompat.setOnApplyWindowInsetsListener) so it accumulates insets
onto existing root padding instead of overwriting it.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Pro
Run ID: de79bfd5-c4cf-4530-b9c8-a2773888454b
📒 Files selected for processing (4)
app/src/main/java/io/github/sheepdestroyer/materialisheep/ThemedActivity.javaapp/src/main/res/layout/activity_drawer.xmlapp/src/main/res/layout/activity_login.xmlapp/src/main/res/layout/activity_settings.xml
💤 Files with no reviewable changes (1)
- app/src/main/res/layout/activity_drawer.xml
🚧 Files skipped from review as they are similar to previous changes (1)
- app/src/main/res/layout/activity_login.xml
| ViewCompat.setOnApplyWindowInsetsListener(root, (v, windowInsets) -> { | ||
| Insets insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars()); | ||
| v.setPadding(insets.left, insets.top, insets.right, insets.bottom); |
There was a problem hiding this comment.
Preserve existing root padding when applying insets.
This currently replaces any pre-set padding on the content root. If a layout/theme already sets padding, it gets lost after insets are applied.
Suggested fix
View root = findViewById(android.R.id.content);
if (root != null) {
+ final int initialLeft = root.getPaddingLeft();
+ final int initialTop = root.getPaddingTop();
+ final int initialRight = root.getPaddingRight();
+ final int initialBottom = root.getPaddingBottom();
ViewCompat.setOnApplyWindowInsetsListener(root, (v, windowInsets) -> {
Insets insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars());
- v.setPadding(insets.left, insets.top, insets.right, insets.bottom);
+ v.setPadding(
+ initialLeft + insets.left,
+ initialTop + insets.top,
+ initialRight + insets.right,
+ initialBottom + insets.bottom
+ );
return windowInsets;
});
ViewCompat.requestApplyInsets(root);
}🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In
`@app/src/main/java/io/github/sheepdestroyer/materialisheep/ThemedActivity.java`
around lines 78 - 80, The current ViewCompat.setOnApplyWindowInsetsListener
callback on the content root replaces any pre-existing padding by calling
v.setPadding(insets.left, insets.top, insets.right, insets.bottom); change this
to preserve existing padding: read the view's current padding
(v.getPaddingLeft(), getPaddingTop(), getPaddingRight(), getPaddingBottom()) and
add the corresponding Insets values (Insets.left/top/right/bottom) before
calling v.setPadding(...). Update the listener in ThemedActivity (the lambda
passed to ViewCompat.setOnApplyWindowInsetsListener) so it accumulates insets
onto existing root padding instead of overwriting it.
|
@jules — This PR has merge conflicts (DIRTY). Please rebase on main and resolve conflicts. Let me know when fixed. |
I have successfully rebased onto master and resolved the merge conflicts. The PR is now clean and up-to-date. |
Co-authored-by: sheepdestroyer <1377479+sheepdestroyer@users.noreply.github.com>
|
@jules — This PR has merge conflicts (DIRTY). Please rebase on main and resolve conflicts. Let me know when fixed. |
I have successfully rebased onto master and resolved the merge conflicts. The PR is now clean and up-to-date. |
Co-authored-by: sheepdestroyer <1377479+sheepdestroyer@users.noreply.github.com>
There was a problem hiding this comment.
Actionable comments posted: 1
🧹 Nitpick comments (1)
app/src/main/java/io/github/sheepdestroyer/materialisheep/AppUtils.java (1)
639-641: 💤 Low valueSilent no-op when context is not a ViewModelStoreOwner.
If
contextis not aViewModelStoreOwner(e.g., aContextThemeWrapperfrom theming or a non-Activity context), the fullscreen action silently does nothing. The previous broadcast-based approach would have worked regardless of context type. This is likely fine for typical Activity-hosted FABs, but verify no call sites pass a wrapped context.🔍 Optional: Add a log for unexpected context types
} else { if (context instanceof ViewModelStoreOwner) { new ViewModelProvider((ViewModelStoreOwner) context).get(FullscreenViewModel.class).setFullscreen(true); + } else { + android.util.Log.w("AppUtils", "toggleFabAction: context is not ViewModelStoreOwner, fullscreen toggle ignored"); } }🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@app/src/main/java/io/github/sheepdestroyer/materialisheep/AppUtils.java` around lines 639 - 641, The current fullscreen toggle silently no-ops when context isn't a ViewModelStoreOwner; update the logic in the block that uses ViewModelProvider so it first attempts to resolve an Activity/ViewModelStoreOwner (unwrapping ContextThemeWrapper or calling Context#getApplicationContext where appropriate) and call new ViewModelProvider((ViewModelStoreOwner) resolved).get(FullscreenViewModel.class).setFullscreen(true) when available, and if not available fall back to the previous broadcast-based mechanism (or at minimum log a warning) so the fullscreen action still works for non-Activity contexts; reference the symbols context, ViewModelStoreOwner, ViewModelProvider, and FullscreenViewModel to locate and modify this behavior.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@app/src/main/java/io/github/sheepdestroyer/materialisheep/WebFragment.java`:
- Around line 182-184: The observer currently uses a method reference to
setFullscreen which accepts a primitive boolean, risking NPE when
LiveData<Boolean> emits null; change the observation to use a lambda that checks
for null before calling setFullscreen (e.g. ignore null or map it to a default)
— locate the call using
ViewModelProvider(...).get(FullscreenViewModel.class).getFullscreenEvent().observe(getViewLifecycleOwner(),
...) and replace the method reference this::setFullscreen with a nullable-safe
lambda that performs an explicit null check and then calls
setFullscreen(boolean) only with a non-null value.
---
Nitpick comments:
In `@app/src/main/java/io/github/sheepdestroyer/materialisheep/AppUtils.java`:
- Around line 639-641: The current fullscreen toggle silently no-ops when
context isn't a ViewModelStoreOwner; update the logic in the block that uses
ViewModelProvider so it first attempts to resolve an
Activity/ViewModelStoreOwner (unwrapping ContextThemeWrapper or calling
Context#getApplicationContext where appropriate) and call new
ViewModelProvider((ViewModelStoreOwner)
resolved).get(FullscreenViewModel.class).setFullscreen(true) when available, and
if not available fall back to the previous broadcast-based mechanism (or at
minimum log a warning) so the fullscreen action still works for non-Activity
contexts; reference the symbols context, ViewModelStoreOwner, ViewModelProvider,
and FullscreenViewModel to locate and modify this behavior.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Pro
Run ID: 3c9f28c0-5401-4549-b6b8-9e508c97fc4b
📒 Files selected for processing (5)
app/src/main/java/io/github/sheepdestroyer/materialisheep/AppUtils.javaapp/src/main/java/io/github/sheepdestroyer/materialisheep/BaseListActivity.javaapp/src/main/java/io/github/sheepdestroyer/materialisheep/FullscreenViewModel.javaapp/src/main/java/io/github/sheepdestroyer/materialisheep/ItemActivity.javaapp/src/main/java/io/github/sheepdestroyer/materialisheep/WebFragment.java
|
|
||
| new ViewModelProvider(requireActivity()).get(FullscreenViewModel.class).getFullscreenEvent() | ||
| .observe(getViewLifecycleOwner(), this::setFullscreen); |
There was a problem hiding this comment.
Potential NullPointerException when observing LiveData with method reference.
The setFullscreen method takes a primitive boolean, but LiveData<Boolean> can emit null (especially on initial observation before any value is set). Using a method reference directly will cause autoboxing to fail with NPE if null is emitted. Other observers in BaseListActivity and ItemActivity have explicit null checks.
🐛 Proposed fix: Add null guard
- new ViewModelProvider(requireActivity()).get(FullscreenViewModel.class).getFullscreenEvent()
- .observe(getViewLifecycleOwner(), this::setFullscreen);
+ new ViewModelProvider(requireActivity()).get(FullscreenViewModel.class).getFullscreenEvent()
+ .observe(getViewLifecycleOwner(), fullscreen -> {
+ if (fullscreen != null) {
+ setFullscreen(fullscreen);
+ }
+ });🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@app/src/main/java/io/github/sheepdestroyer/materialisheep/WebFragment.java`
around lines 182 - 184, The observer currently uses a method reference to
setFullscreen which accepts a primitive boolean, risking NPE when
LiveData<Boolean> emits null; change the observation to use a lambda that checks
for null before calling setFullscreen (e.g. ignore null or map it to a default)
— locate the call using
ViewModelProvider(...).get(FullscreenViewModel.class).getFullscreenEvent().observe(getViewLifecycleOwner(),
...) and replace the method reference this::setFullscreen with a nullable-safe
lambda that performs an explicit null check and then calls
setFullscreen(boolean) only with a non-null value.
1 participant
💡 What: Refactored
AndroidUtils.TextUtils.equalsto safely utilize Java's highly optimizedString.contentEquals(CharSequence)standard library method when comparing a String with another CharSequence.🎯 Why: The previous custom implementation manually iterated through character sequences. Because
AndroidUtilsis designed specifically to facilitate pure Java unit testing without triggering "Stub!" RuntimeExceptions from the Android framework, we could not directly delegate toandroid.text.TextUtils.equals. By usingString.contentEquals, we avoid the overhead of a character-by-characterforloop in pure Java contexts, while safely avoiding anytoString()allocations orminSdkVersionmethod availability issues.📊 Measured Improvement:
The O(1) string length check is preserved natively within
contentEquals. The original fallback loop is kept intact for generic CharSequence to CharSequence comparisons (e.g., Spannable vs StringBuilder) to ensure pure functional parity.PR created automatically by Jules for task 5118965361211130801 started by @sheepdestroyer
Summary by CodeRabbit
New Features
Bug Fixes
Performance
Chores
Documentation