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Agenda • Working with repo • Lunch targets and variants • Adding a new device • System properties • Resource overlays • Adding new modules • Soong build system • Apps • Library

Repo init $ repo init -u -b -m

Repo init - with mirror $ cd $ repo init -u -b -m --mirror $ repo sync -c -j $ cd $ repo init -u -b -m \ --reference= $ repo sync -c -j

Proprietary binaries

Lunch targets $ . build/envsetup.sh $ lunch

Lunch targets $ lunch You're building on Linux Lunch menu... pick a combo: ... 28. aosp_flame-userdebug 29. aosp_flame_car-userdebug 30. aosp_redfin-userdebug 31. aosp_redfin_car-userdebug ... Which would you like? [aosp_arm-eng]

Common lunch targets (AndroidProducts.mk) COMMON_LUNCH_CHOICES := \ aosp_flame-userdebug \ aosp_flame_car-userdebug \

Variants

Common lunch targets (AndroidProducts.mk) COMMON_LUNCH_CHOICES := \ aosp_flame-userdebug \ aosp_flame_car-eng \ aosp_flame_car-userdebug \

Adding a new device to AOSP $ mkdir device// $ vim device///AndroidProducts.mk

AndroidProducts.mk (my_device) PRODUCT_MAKEFILES := $(LOCAL_DIR)/aosp_my_device.mk COMMON_LUNCH_CHOICES := aosp_my_device-userdebug

aosp_my_device.mk # Inherit from the common Open Source product configuration $(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk) $(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_base_telephony.mk) PRODUCT_NAME := aosp_my_device PRODUCT_DEVICE := my_device PRODUCT_BRAND := Android PRODUCT_MODEL := Eriks AOSP on Pixel5 PRODUCT_MANUFACTURER := Hellsoft PRODUCT_RESTRICT_VENDOR_FILES := true $(call inherit-product, device/google/redfin/device-redfin.mk) $(call inherit-product-if-exists, vendor/google_devices/redfid/device-vendor-redfin.mk)

System properties PRODUCT_SYSTEM_PROPERTIES += \ ro.lockscreen.disable.default=true \ ro.config.low_ram=true \

Resource overlays PRODUCT_PACKAGE_OVERLAYS += device/google/redfin/redfin/overlay

Resource overlays $ pwd /mnt/aosp/device/google/redfin/redfin/overlay $ ls frameworks packages vendor $ tree -C -d frameworks frameworks └── base ├── core │ └── res │ └── res │ ├── values │ └── xml └── packages └── SystemUI └── res ├── drawable ├── values └── values-land

frameworks/base/core/res/res/config.xml false 108px 28dp

Adding packages to AOSP

Soong build system

Bazel for AOSP

Soong documentation https://ci.android.com/builds/submitted/11094138/linux/ latest/view/soong_build.html

Add a new app Android.bp android_app { name: "my_system_app", resource_dirs: ["res"], sdk_version: "current", srcs: [ "src/**/*.kt", "gen/**/*.java", ], product_specific: true, static_libs: [ "androidx.annotation_annotation", "androidx.collection_collection", "androidx.arch.core_core-common", "androidx.lifecycle_lifecycle-common", "com.google.android.material_material", "androidx.lifecycle_lifecycle-runtime", "androidx.core_core", "androidx.recyclerview_recyclerview", ], }

Import an APK android_app_import { name: "my_imported_app", apk: "remote_display_manager.apk", certificate: "platform", privileged: true, required: ["privapp_whitelist_se.hellsoft.myapp"] }

Grant permissions to preinstalled apps

Including permissions file in AOSP build prebuilt_etc { name: "privapp_whitelist_se.hellsoft.myapp", system_ext_specific: true, sub_dir: "permissions", src: "se.hellsoft.myapp.xml", filename_from_src: true, }

Java SDK library java_sdk_library { name: "my_java_sdk_library", public: { enabled: true, }, system: { enabled: true, }, srcs: [ "src/**/*.java", ], api_packages: [ "se.hellsoft.mylib", ], }

Include modules in product build AndroidProduct.mk PRODUCT_PACKAGES += \ my_system_app \ my_imported_app \ my_java_sdk_library \

Build your new module $ cd packages/apps/my_system_app $ mma

Thank you for listening! speakerdeck.com/erikhellman