Welcome 👋

What's this?

Developers write better apps when they can read the source. Unfortunately, the sources for the Android framework and various Google Android libraries are scattered all over the web.

This pages aims to help developers find the sources they're looking for.

Can I help?

You can improve this page and help the Android community by opening an issue or a pull request 🙏.

Libraries

Jetpack

• Most Jetpack libraries have sources available on cs.android.com in the androidx subproject.
  • androidx.activity
  • Startup
  • Compose
  • There's way more entries to add here.

ConstraintLayout / MotionLayout

• Developed directly on GitHub, browsable on cs.android.com.
  • The git history starts at 2.0.0, 1.x sources are available here.

Espresso / Android Test

• Developed directly on GitHub.

Data Binding

• Available on android.googlesource.com on the mirror-goog-studio-master-dev branch.
  • 👎🔎 Not searchable online: googlesource.com is not indexed.

Dagger 2

• Developed directly on GitHub.

The Android Framework

• Available on cs.android.com
• View internals? See View.java.
• Activity lifecycle? See ActivityThead.java.
• Art Runtime? See class.cc.

What if it's a new version, sources not available yet?

• Start an emulator for the latest version.
• Run adb pull /system/framework/framework.jar.
• Unzip framework.jar (contains dexes).
• Use dex2jar to turn dexes into jars.
• Explore with jd-gui or IntelliJ (hack: add as a dependency)

Android Studio

• Available on cs.android.com on the studio-master-dev branch.
  • 👎🔎 Not searchable online: the studio-master-dev branch is not indexed.

Android Gradle Plugin (AGP)

• Available on android.googlesource.com on the mirror-goog-studio-master-dev branch.
• @jrodbx dumped the sources for each release on github.

Kotlin

• Sources for the Kotlin compiler and standard lib are on GitHub

Google Play Services

• Play Services is not open source. I added this entry because people keep asking about it 😅.