Android/Building/SystemAPPs

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System APPs

Android system APPs are these applications 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 is only one way 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

Important: system partition size needs adjust
Since system partition has limited size, developer should make sure system partition size is big enough for the new applications.

Upgrade

  • System APPs should be upgraded via update system in recovery mode.
  • System APPs can be upgraded as normal application, the new version will be stored on data partition.

System Partition Size

System partition size configuration is located in [BoardConfigVender.mk] under vendor/olpx/xo4 folder in source code.

SYSTEM_IMAGE_SIZE_IN_MEGABYTES := 420

Size are in megabytes.

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