androidx/androidx
Jul 2025 – Mar 2026
9 Months active
Languages Used
GradleJavaKotlintextShellProguardGroovyMarkdown
Technical Skills
API DesignAPI Level TestingAndroid DevelopmentAndroid TestingAnimationBenchmark
Jossi Wolf
PROFILE
Jossi Wolf
Jossiwolf contributed to the androidx/androidx repository by developing and optimizing performance benchmarks, UI components, and infrastructure for Android applications. Over nine months, he delivered features such as macrobenchmarks for animation and text input, improved gesture handling, and enhanced benchmarking reliability. His work involved Kotlin and Gradle, leveraging Jetpack Compose and AndroidX internals to refine UI rendering, database management, and CI integration. Jossiwolf addressed race conditions, stabilized drag interactions, and introduced feature flags for safer rollouts. His engineering approach emphasized maintainability, measurable performance gains, and robust testing, resulting in more reliable metrics and smoother user experiences across mobile UI components.
Overall Statistics
Feature vs Bugs
80%Features
Repository Contributions
70Total
Bugs
5
Commits
70
Features
20
Lines of code
56,253
Activity Months9
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5007 peopleSame Organization
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Work History
March 2026
12 Commits • 3 Features
Mar 1, 2026Month 2026-03 — Consolidated the AndroidX repository work in three focused areas: UI rendering improvements, benchmarking instrumentation with CI reliability, and GPU rendering performance validation. Delivered measurable stability gains, robust performance benchmarks, and clearer guidance for future optimizations. Key features delivered: - UI Rendering Enhancements and Maintenance (androidx/androidx): Refactored cursor drawing to a simpler modifier path for stability, improved text field reliability and sizing, and completed maintenance patches to reduce regressions. Notable commit highlights include a700c6e77a4db103f3dcd3057c2c62768a026f9a, 2befc553c6fc9ac99c545fbcdfbbfc9c507991f9, aa1356624c4d71843c8384cc3fdf8f923d59ae4f, f0cb2d41f82b69291fd0042142130c4ef6f0625d, 3d0b20082c43188e0cde89364e57747c78321164, 86200dbc3d0805c85f5f98e9b16bd4455d5d51ed. - Benchmark Instrumentation, Animation Accuracy, and CI Stability: Added time-to-first-pixel benchmarks, introduced androidx.benchmark.requireLockedClocks flag, enabled CI clock locking checks, and expanded tracing for benchmark scenarios. Key commits include dc297faed52ec9a3709c8341f0ae9894317fa5b2, f5df8944415d170746eeebd826c02ba3f4c94966, 68319648cf831e066fa5c00a12cb76776f3f460b, 63570b2443c1060db49c297bf1978d0d866a06d1, 5d3fa28375ddb112bb21982d02447e7897290bab. - GPU/Rendering Performance Enhancements: Corrected GPU frequency locking calculation to use proper units (Hz), leading to more accurate target frequencies and better performance assessment. Commit: 3b6e9322ed2761dc2c9b235c2194d90181475d4f. Major bugs fixed: - Fixed BasicTextField Max Lines Height bug by aligning resolved style updates with measure invalidation and improving font resolution logic; toggled optimization flags to simplify revertability (Commits: f0cb2d41f82b69291fd0042142130c4ef6f0625d, If26ca2a57abc89d835bdc6745b8546f4782494de, I0d3012a2a5a6cb89712891b8a5024ca3a9be8cc2). - Fixed extra layout invalidation in TextFieldSize by reverting to pre-aosp/3959225 behavior (Commit: I43c386b1f70b7010e317fd1f4de73a9345ebd9a2). - Re-enabled isBasicTextFieldMinSizeOptimizationEnabled after bugs were resolved (Commit: 3d0b20082c43188e0cde89364e57747c78321164). Overall impact and accomplishments: - Enhanced UI responsiveness and stability across Compose-based text fields, contributing to a smoother user experience in apps relying on androidx/androidx. - Strengthened performance validation and CI reliability with structured benchmarks, clock-lock checks, and richer tracing. - Improved accuracy of GPU performance measurements, informing better target frequencies and resource planning. Technologies and skills demonstrated: - Kotlin, Jetpack Compose, AndroidX internals, TextField internals, cursor rendering optimization, text layout and font resolution strategies. - Benchmarking, performance profiling, CI integration, and feature flag-based experimentation for safer rollout decisions. - Regression testing, manual and automated verification across UI and rendering paths.
12 Commits • 3 Features
Mar 1, 2026Month 2026-03 — Consolidated the AndroidX repository work in three focused areas: UI rendering improvements, benchmarking instrumentation with CI reliability, and GPU rendering performance validation. Delivered measurable stability gains, robust performance benchmarks, and clearer guidance for future optimizations. Key features delivered: - UI Rendering Enhancements and Maintenance (androidx/androidx): Refactored cursor drawing to a simpler modifier path for stability, improved text field reliability and sizing, and completed maintenance patches to reduce regressions. Notable commit highlights include a700c6e77a4db103f3dcd3057c2c62768a026f9a, 2befc553c6fc9ac99c545fbcdfbbfc9c507991f9, aa1356624c4d71843c8384cc3fdf8f923d59ae4f, f0cb2d41f82b69291fd0042142130c4ef6f0625d, 3d0b20082c43188e0cde89364e57747c78321164, 86200dbc3d0805c85f5f98e9b16bd4455d5d51ed. - Benchmark Instrumentation, Animation Accuracy, and CI Stability: Added time-to-first-pixel benchmarks, introduced androidx.benchmark.requireLockedClocks flag, enabled CI clock locking checks, and expanded tracing for benchmark scenarios. Key commits include dc297faed52ec9a3709c8341f0ae9894317fa5b2, f5df8944415d170746eeebd826c02ba3f4c94966, 68319648cf831e066fa5c00a12cb76776f3f460b, 63570b2443c1060db49c297bf1978d0d866a06d1, 5d3fa28375ddb112bb21982d02447e7897290bab. - GPU/Rendering Performance Enhancements: Corrected GPU frequency locking calculation to use proper units (Hz), leading to more accurate target frequencies and better performance assessment. Commit: 3b6e9322ed2761dc2c9b235c2194d90181475d4f. Major bugs fixed: - Fixed BasicTextField Max Lines Height bug by aligning resolved style updates with measure invalidation and improving font resolution logic; toggled optimization flags to simplify revertability (Commits: f0cb2d41f82b69291fd0042142130c4ef6f0625d, If26ca2a57abc89d835bdc6745b8546f4782494de, I0d3012a2a5a6cb89712891b8a5024ca3a9be8cc2). - Fixed extra layout invalidation in TextFieldSize by reverting to pre-aosp/3959225 behavior (Commit: I43c386b1f70b7010e317fd1f4de73a9345ebd9a2). - Re-enabled isBasicTextFieldMinSizeOptimizationEnabled after bugs were resolved (Commit: 3d0b20082c43188e0cde89364e57747c78321164). Overall impact and accomplishments: - Enhanced UI responsiveness and stability across Compose-based text fields, contributing to a smoother user experience in apps relying on androidx/androidx. - Strengthened performance validation and CI reliability with structured benchmarks, clock-lock checks, and richer tracing. - Improved accuracy of GPU performance measurements, informing better target frequencies and resource planning. Technologies and skills demonstrated: - Kotlin, Jetpack Compose, AndroidX internals, TextField internals, cursor rendering optimization, text layout and font resolution strategies. - Benchmarking, performance profiling, CI integration, and feature flag-based experimentation for safer rollout decisions. - Regression testing, manual and automated verification across UI and rendering paths.
March 2026
February 2026
5 Commits • 3 Features
Feb 1, 2026February 2026 (2026-02) performance-focused sprint for androidx/androidx. Delivered features to improve developer usability and keyboard handling, along with performance benchmarks for BasicTextField. No major user-facing bugs were reported this month; one tracked issue was associated with the NumPadDelete API. Key work centered on documentation, API completeness, and internal rendering/layout optimizations to boost runtime efficiency and developer onboarding across the repository.
February 2026
5 Commits • 3 Features
Feb 1, 2026February 2026 (2026-02) performance-focused sprint for androidx/androidx. Delivered features to improve developer usability and keyboard handling, along with performance benchmarks for BasicTextField. No major user-facing bugs were reported this month; one tracked issue was associated with the NumPadDelete API. Key work centered on documentation, API completeness, and internal rendering/layout optimizations to boost runtime efficiency and developer onboarding across the repository.
January 2026
5 Commits • 1 Features
Jan 1, 2026January 2026 focused on hardening drag-related primitives and stabilizing Material3 anchor logic through feature-flagged changes and targeted bug fixes. Delivered feature-flag controlled improvements for anchored draggable components, and fixed critical race conditions impacting state accuracy and drag semantics. Result is smoother drag interactions, fewer glitches, and safer rollout of experimental behaviors across key Material3 and drag-related components.
5 Commits • 1 Features
Jan 1, 2026January 2026 focused on hardening drag-related primitives and stabilizing Material3 anchor logic through feature-flagged changes and targeted bug fixes. Delivered feature-flag controlled improvements for anchored draggable components, and fixed critical race conditions impacting state accuracy and drag semantics. Result is smoother drag interactions, fewer glitches, and safer rollout of experimental behaviors across key Material3 and drag-related components.
January 2026
December 2025
3 Commits • 3 Features
Dec 1, 2025Month: 2025-12 — Benchmarking, compatibility, and UX stabilization improvements in androidx/androidx. Delivered three key enhancements with direct business value: more reliable performance metrics, better API compatibility, and stabilized navigation in benchmarks.
December 2025
3 Commits • 3 Features
Dec 1, 2025Month: 2025-12 — Benchmarking, compatibility, and UX stabilization improvements in androidx/androidx. Delivered three key enhancements with direct business value: more reliable performance metrics, better API compatibility, and stabilized navigation in benchmarks.
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 — androidx/androidx: Introduced SceneTransitionLayout Performance Benchmarking Suite to quantify animation performance for complex transitions and enable regression detection. Work focused on instrumentation and validation using SysUi-based benchmarks, with local validation on Sargo. No major bug fixes recorded this month for this scope. Impact: provides measurable performance data, enabling data-driven optimizations and more predictable release cycles. Technologies: AndroidX, SceneTransitionLayout, SysUi, benchmarking instrumentation, local device testing; CI readiness.
1 Commits • 1 Features
Nov 1, 2025November 2025 — androidx/androidx: Introduced SceneTransitionLayout Performance Benchmarking Suite to quantify animation performance for complex transitions and enable regression detection. Work focused on instrumentation and validation using SysUi-based benchmarks, with local validation on Sargo. No major bug fixes recorded this month for this scope. Impact: provides measurable performance data, enabling data-driven optimizations and more predictable release cycles. Technologies: AndroidX, SceneTransitionLayout, SysUi, benchmarking instrumentation, local device testing; CI readiness.
November 2025
October 2025
10 Commits • 2 Features
Oct 1, 2025October 2025 performance and reliability focus for androidx/androidx delivered a tightly scoped set of benchmark reliability enhancements and CI/build stability improvements. The work strengthens business value by reducing flakiness in performance signals, accelerating debugging, and enabling faster release readiness across Compose and Views benchmarks.
October 2025
10 Commits • 2 Features
Oct 1, 2025October 2025 performance and reliability focus for androidx/androidx delivered a tightly scoped set of benchmark reliability enhancements and CI/build stability improvements. The work strengthens business value by reducing flakiness in performance signals, accelerating debugging, and enabling faster release readiness across Compose and Views benchmarks.
September 2025
10 Commits • 2 Features
Sep 1, 20252025-09 monthly summary for androidx/androidx: Focused on stabilizing and accelerating performance benchmarks with a strong emphasis on reliability and business value. Delivered Pokedex Macrobenchmark stability, correctness, and performance improvements alongside Hero Benchmark CI time reduction. Implemented test isolation and asset-loading optimizations to improve throughput and reduce flaky results, contributing to faster, more trustworthy performance metrics.
10 Commits • 2 Features
Sep 1, 20252025-09 monthly summary for androidx/androidx: Focused on stabilizing and accelerating performance benchmarks with a strong emphasis on reliability and business value. Delivered Pokedex Macrobenchmark stability, correctness, and performance improvements alongside Hero Benchmark CI time reduction. Implemented test isolation and asset-loading optimizations to improve throughput and reduce flaky results, contributing to faster, more trustworthy performance metrics.
September 2025
August 2025
9 Commits • 1 Features
Aug 1, 2025August 2025 highlights: Fixed a regression in AndroidX gesture handling for anchored draggable fling by reverting overshoot in SnapFlingBehavior and ensuring confirmValueChange is invoked, with tests added to verify gesture behavior. Expanded benchmarking and testing infrastructure for the Pokedex app, introducing a TestRunner for macrobenchmarks, a Shared Element Transition Benchmark for Pokedex-Views, startup and scroll benchmarks, and robust database cleanup for macrobenchmark targets, along with UiAutomator Find fixes. These efforts reduce regression risk, improve performance visibility, and accelerate iteration cycles across projects. Technologies demonstrated include AndroidX gesture APIs, macrobenchmark tooling, test automation patterns, and UI benchmarking for transitions, startup, and scrolling. Business impact: smoother user interactions, more reliable performance signals, and faster detection of regressions across mobile UI components.
August 2025
9 Commits • 1 Features
Aug 1, 2025August 2025 highlights: Fixed a regression in AndroidX gesture handling for anchored draggable fling by reverting overshoot in SnapFlingBehavior and ensuring confirmValueChange is invoked, with tests added to verify gesture behavior. Expanded benchmarking and testing infrastructure for the Pokedex app, introducing a TestRunner for macrobenchmarks, a Shared Element Transition Benchmark for Pokedex-Views, startup and scroll benchmarks, and robust database cleanup for macrobenchmark targets, along with UiAutomator Find fixes. These efforts reduce regression risk, improve performance visibility, and accelerate iteration cycles across projects. Technologies demonstrated include AndroidX gesture APIs, macrobenchmark tooling, test automation patterns, and UI benchmarking for transitions, startup, and scrolling. Business impact: smoother user interactions, more reliable performance signals, and faster detection of regressions across mobile UI components.
July 2025
15 Commits • 4 Features
Jul 1, 2025July 2025 (2025-07) performance-focused delivery across the androidx/androidx repository. Focused on improving runtime efficiency, correctness of parameter propagation, benchmarking fidelity, and support for cross-API and cross-device scenarios. Delivered features that enhance user experience and measurement reliability, with clear business value in performance, stability, and maintainability.
15 Commits • 4 Features
Jul 1, 2025July 2025 (2025-07) performance-focused delivery across the androidx/androidx repository. Focused on improving runtime efficiency, correctness of parameter propagation, benchmarking fidelity, and support for cross-API and cross-device scenarios. Delivered features that enhance user experience and measurement reliability, with clear business value in performance, stability, and maintainability.
July 2025
Activity
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Quality Metrics
Correctness90.0%
Maintainability85.4%
Architecture82.2%
Performance81.2%
AI Usage22.2%
Skills & Technologies
Programming Languages
GradleGroovyJavaKotlinMarkdownProguardShelltext
Technical Skills
API DesignAPI DevelopmentAPI Level TestingAndroid DevelopmentAndroid TestingAndroid developmentAnimationBenchmarkBenchmark TestingBenchmarkingBuild ConfigurationCI/CDCode RefactoringComposeContinuous Integration
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline