Google Git
Sign in
android / platform / frameworks / support / fdcf01bdf0735b2738cce5a9acd5002ccbc5c55e
commitfdcf01bdf0735b2738cce5a9acd5002ccbc5c55e[log] [tgz]
authorRomain Guy <[email protected]>Wed Oct 16 16:10:02 2024 -0700
committerRomain Guy <[email protected]>Mon Jan 06 10:45:11 2025 -0800
tree856128c2c5194d503cb0d90acc14591ceb0dc293
parenta1ec027bb75a9703f129b78c51bca3cf0921807d [diff]
Optimize various things:

Optimize array management:
- Use @NeverInline in the cold code paths where we reallocate arrays
  to avoid putting a large amount of instructions on the hot path
  (caused by ART inlining).
- Introduce fastCopyOfRange() to reduce the amount of generated code
  (exception/stack trace + string builder) by skipping parameters
  validation we don't need.
- Introduce fastCopyInto() to eliminate unnecessary checks and
  exception throwing code introduced by the compiler after inlining.
- Don't use copyOf() in the color space code, just create the array
  we need with the known values we need. It produces a lot less
  code.
- Remove extra branches and instructions from IntStack.

Other optimizations:
- Branchless calls in ScrollNode
- Skip static initialization checks in OpArray by removing the
  companion object we don't need.
- Revert Constraints.bitsNeed...() and .maxAllowedForSize() to
  the original implementation. The dependent add operation we
  had to add is actually slightly worse on modern devices.
  It's better to keep the code simpler.
- Unify padding checks in Padding.kt. Removes 60% of the
  branches on initialization.
  Optimize for the common case by switching to and instead
  of && in the test to go branchless. Factor method calls.
- Use "fast" coerce implementations where possible.
- Don't compare dps to Dp.Unspecified, use Dp.isSpecified
  instead (or Dp.isUnspecified). Same result, but much
  cheaper since we know Dp.Unspecified is NaN.
- Cleanup: address various warnings.

Test: ui tests, foundation tests, graphics tests
Relnote: N/A
Change-Id: I8402e8cfabf9726362273b2e7f5647854e602d63
44 files changed
tree: 856128c2c5194d503cb0d90acc14591ceb0dc293
  1. .github/
  2. .idea/
  3. activity/
  4. annotation/
  5. appcompat/
  6. appintegration/
  7. appsearch/
  8. arch/
  9. asynclayoutinflater/
  10. autofill/
  11. benchmark/
  12. binarycompatibilityvalidator/
  13. biometric/
  14. bluetooth/
  15. browser/
  16. buildSrc/
  17. buildSrc-tests/
  18. busytown/
  19. camera/
  20. car/
  21. cardview/
  22. collection/
  23. compose/
  24. concurrent/
  25. constraintlayout/
  26. contentpager/
  27. coordinatorlayout/
  28. core/
  29. credentials/
  30. cursoradapter/
  31. customview/
  32. datastore/
  33. development/
  34. docs/
  35. docs-public/
  36. docs-tip-of-tree/
  37. documentfile/
  38. draganddrop/
  39. drawerlayout/
  40. dynamicanimation/
  41. emoji/
  42. emoji2/
  43. enterprise/
  44. exifinterface/
  45. external/
  46. fragment/
  47. glance/
  48. gradle/
  49. graphics/
  50. gridlayout/
  51. health/
  52. heifwriter/
  53. hilt/
  54. ink/
  55. input/
  56. inspection/
  57. interpolator/
  58. javascriptengine/
  59. kruth/
  60. leanback/
  61. lifecycle/
  62. lint/
  63. lint-checks/
  64. loader/
  65. media/
  66. mediarouter/
  67. metrics/
  68. navigation/
  69. navigation3/
  70. paging/
  71. palette/
  72. pdf/
  73. percentlayout/
  74. performance/
  75. placeholder/
  76. placeholder-tests/
  77. playground-common/
  78. playground-projects/
  79. preference/
  80. print/
  81. privacysandbox/
  82. profileinstaller/
  83. recommendation/
  84. recyclerview/
  85. remotecallback/
  86. resourceinspection/
  87. room/
  88. safeparcel/
  89. samples/
  90. savedstate/
  91. security/
  92. sharetarget/
  93. slice/
  94. slidingpanelayout/
  95. sqlite/
  96. stableaidl/
  97. startup/
  98. swiperefreshlayout/
  99. test/
  100. testutils/
  101. tracing/
  102. transition/
  103. tv/
  104. tvprovider/
  105. vectordrawable/
  106. versionedparcelable/
  107. viewpager/
  108. viewpager2/
  109. wear/
  110. webkit/
  111. window/
  112. work/
  113. .gitignore
  114. build.gradle
  115. cleanBuild.sh
  116. code-review.md
  117. CONTRIBUTING.md
  118. gradle.properties
  119. gradlew
  120. libraryversions.toml
  121. license-baseline.txt
  122. LICENSE.txt
  123. OWNERS
  124. PREUPLOAD.cfg
  125. README.md
  126. settings.gradle
  127. studiow
  128. TEXT_OWNERS
README.md

Android Jetpack

Revved up by Develocity

Jetpack is a suite of libraries, tools, and guidance to help developers write high-quality apps easier. These components help you follow best practices, free you from writing boilerplate code, and simplify complex tasks, so you can focus on the code you care about.

Jetpack comprises the androidx.* package libraries, unbundled from the platform APIs. This means that it offers backward compatibility and is updated more frequently than the Android platform, making sure you always have access to the latest and greatest versions of the Jetpack components.

Our official AARs and JARs binaries are distributed through Google Maven.

You can learn more about using it from Android Jetpack landing page.

Contribution Guide

For contributions via GitHub, see the GitHub Contribution Guide.

Note: The contributions workflow via GitHub is currently experimental - only contributions to the following projects are being accepted at this time:

Code Review Etiquette

When contributing to Jetpack, follow the code review etiquette.

Accepted Types of Contributions

  • Bug fixes - needs a corresponding bug report in the Android Issue Tracker
  • Each bug fix is expected to come with tests
  • Fixing spelling errors
  • Updating documentation
  • Adding new tests to the area that is not currently covered by tests
  • New features to existing libraries if the feature request bug has been approved by an AndroidX team member.

We are not currently accepting new modules.

Checking Out the Code

Head over to the onboarding docs to learn more about getting set up and the development workflow!

Continuous integration

Our continuous integration system builds all in progress (and potentially unstable) libraries as new changes are merged. You can manually download these AARs and JARs for your experimentation.

Password and Contributor Agreement before making a change

Before uploading your first contribution, you will need setup a password and agree to the contribution agreement:

Generate a HTTPS password: https://android-review.googlesource.com/new-password

Agree to the Google Contributor Licenses Agreement: https://android-review.googlesource.com/settings/new-agreement

Getting reviewed

  • After you run repo upload, open r.android.com
  • Sign in into your account (or create one if you do not have one yet)
  • Add an appropriate reviewer (use git log to find who did most modifications on the file you are fixing or check the OWNERS file in the project's directory)

Handling binary dependencies

AndroidX uses git to store all the binary Gradle dependencies. They are stored in prebuilts/androidx/internal and prebuilts/androidx/external directories in your checkout. All the dependencies in these directories are also available from google(), or mavenCentral(). We store copies of these dependencies to have hermetic builds. You can pull in a new dependency using our importMaven tool.