Android System Service IPC Example

In Android system, the main IPC is the binder. App can invoke a API from other app by binder, or it can create a binder service.

And you can make many system services for customing a ROM. Here we create many base codes for creating a system service in native code c level and Java code level.

How to install

Important:

Base environment: Ubuntu 12.04

Under AOSP

Compile them by AOSP mm.

AOSP should have compiled.

# In AOSP topdir
## source
source build/envsetup.sh
## lunch
lunch XXXX

# to source code
cd android_system_service_example
# Compile
mm

With Android SDK & NDK

System service Binder API is a hack techincal for customing ROM, so the system binder API invoking is also the hack techincal. Such as reflecting in Java and linking binder header in native codes.

Java code, you can use SDK to compile.

NDK for native code

#Go to sourcecode
cd android_system_service_example/NDKBuild
#Invoke NDK Command
XXXXXX/bins/android-ndk-r10c/ndk-build

For natice c code, there is not a better way for compiling in NDK because of some Binder APIs which are not Supported in NDK. If we want to make compiling in NDK, we need to copy a lot of frameworks header files. So here I copy headers and shared libraries for compiling as demo.

And the environment is:

    PLATFORM_VERSION_CODENAME=REL
    PLATFORM_VERSION=4.4
    TARGET_PRODUCT=aosp_mako
    TARGET_BUILD_VARIANT=userdebug
    TARGET_BUILD_TYPE=release
    TARGET_BUILD_APPS=
    TARGET_ARCH=arm
    TARGET_ARCH_VARIANT=armv7-a-neon
    TARGET_CPU_VARIANT=krait
    HOST_ARCH=x86
    HOST_OS=linux
    HOST_OS_EXTRA=Linux-3.2.0-60-generic-x86_64-with-Ubuntu-12.04-precise
    HOST_BUILD_TYPE=release
    BUILD_ID=KRT16S
    OUT_DIR=out

Running

Because of using system API, the program should have SYSTEM permission.

Native code: running in root
Java code: sign by platfrom certificate

qianjigui / android_system_service_example