Source-code companion for The Staff Android Engineer. Chapter explanations, exercises, written solutions and editorial records are distributed with the book, not this repository.

Use JDK 27 and this repository’s pinned Gradle wrapper/version catalog. Install the Android SDK/platform/build tools specified in app/build.gradle.kts. Set ANDROID_HOME or an untracked local.properties file.

./gradlew :app:assembleDebug
./gradlew tasks --all

Build flavors, deliberate failing implementations and test tasks are described in the book. Select the documented checkpoint; do not treat learner/negative failures as a reference result.

Chapter 5 JVM source is included under core/src/main/kotlin; hashes and origin are recorded in core/SOURCE-PROVENANCE.json. No parent book checkout is required.

Local SDK settings, runtime data, generated APKs, captured evidence and book text are excluded. Keep required third-party licences/notices with the code. Original companion code is MIT licensed; third-party materials retain their own licences. The paid book and its written teaching are not included in this licence.

Use the first-edition-2026.10 tag with the first edition. The companion index maps chapters to tested versions and the complete source download. For investigations that share tools across projects, use the complete source bundle and its code/projects/ layout. Detailed reader instructions are supplied with the purchased book.