Android/Building/SystemAPPs

System APPs

Android system APPs are these APPs which are installed in system partition. Since system partition is read only at runtime, thus the system APPs are not remove-able for general user.

Add/Remove

In general, there are two ways to add/remove system applications.

At build time

System application configurations for android build system are located under source code folder vendor/olpc/xo4/apps/ To add an application in system partition simply do:

• Copy pre-built APK file to vendor/olpx/xo4/apps/

cp YourAPKName.apk vendor/olpc/xo4/apps/

• Add build description in Android.mk under vendor/olpx/xo4/apps

include $(CLEAR_VARS)
LOCAL_MODULE := YourAPKName
LOCAL_MODULE_OWNER := xxxx
LOCAL_SRC_FILES := $(LOCAL_MODULE).apk
LOCAL_MODULE_CLASS := APPS
LOCAL_MODULE_TAGS := optional
LOCAL_CERTIFICATE := platform
LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
include $(BUILD_PREBUILT)

Note: If no need to resign application put PRESIGNED instead of platform

• Add module name in apps.mk under vendor/olpx/xo4/apps

PRODUCT_PACKAGES += \
   ....... \
   ....... \
   YourAPKName

• Rebuild Android system

Important: system partition size needs adjust
Since system partition has limited size, developer should make sure [System Partition Size|system partition size] is big enough for the new applications.

At runtime

This relies on Android OTA update system which allow the system reboots into recovery mode then mount system partition as RW for applying system partition changes.
XO-4 does NOT support runtime system partition update since recovery mode haven't been implemented.