用 android build system 编译自己的app

http://cornsea.blogspot.com/2009/03/anroid-build-system-init.html

在system文件夹下

建立一个myinit文件夹

编辑一个init.c文件

代码如下

#include <stdio.h>

#include <unistd.h>

int main(int argc, char *argv[])

{

int i = 0;

while (1)

{

printf("hello world (%d)",i++);

sleep(2);

}

return 0;

}

另外建立一个Android.mk 文件，内容如下

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= /

init.c

LOCAL_MODULE:= init

LOCAL_FORCE_STATIC_EXECUTABLE := true

LOCAL_MODULE_PATH := $(TARGET_ROOT_OUT)

LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_UNSTRIPPED)

LOCAL_STATIC_LIBRARIES := libcutils libc

#LOCAL_STATIC_LIBRARIES := libcutils libc libminui
libpixelflinger_static

#LOCAL_STATIC_LIBRARIES += libminzip libunz libamend libmtdutils
libmincrypt

#LOCAL_STATIC_LIBRARIES += libstdc++_static

include $(BUILD_EXECUTABLE)

在myinit文件夹下输入mm，

编译系统就会自动输出一个编译好的init程序

输出的路径也会提示出来。

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Another
paper in english

Add a new
component into open source Android

The android build system is complicated. It is not easy to create a
simple build script to build single component. But it is much
easier to add a new component into the build system. Here is a
sample to build the "Hello world!" for Android, and it is dynamic
linked executable.

create a directory for the new component in
$(YOUR_ANDROID)/external folder:
$(YOUR_ANDROID)/external/hello

put the hello.c into the directory:
$(YOUR_ANDROID)/external/hello/

create Android.mk in $(YOUR_ANDROID)/external/hello/ directory,
the Android.mk likes the following:

LOCAL_PATH:=$(call my-dir)

include $(CLEAR_VARS)

LOCAL_ARM_MODE := arm

LOCAL_SRC_FILES:= /

hello.c

LOCAL_MODULE := hello

include $(BUILD_EXECUTABLE)

add the following line into
$(BUILD_SYSTEM)/main.mk,$(BUILD_SYSTEM) is in
$(YOUR_ANDROID)/build/core:

external/hello

launch the build command in $(YOUR_ANDROID): make hello

you will have the build target hello in
$(YOUR_ANDROID)/out/target/product/generic/system/bin.

You can use include $(BUILD_SHARED_LIBRARY) to create shared
library. Find more in $(YOUR_ANDROID)/build/core/config.mk.