编译Android系统APK
1、设置环境

export ANDROID_HOME=/home/administrator/soft/android
export PATH=$PATH:$ANDROID_HOME/out/host/linux-x86/bin
export ANDROID_PRODUCT_OUT=$ANDROID_HOME/out/target/product/generic

2、创建项目

android create project -t 1 -k com.lhw.led -a MainActivity -p ./led
Avd id: 1，It's get by command "android list"

Project Name: led
Package: com.lhw.led 

Main Activity:MainActivity

Project Path: ./

接下来就是自己编写Android程序了。

3、编写Android.mk
Android.mk需要放在项目根路径下，即led下,内容：

LOCAL_PATH       := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_SRC_FILES     := $(call all-subdir-java-files)
LOCAL_PACKAGE_NAME   := led 

LOCAL_JAVA_LIBRARIES  := 
LOCAL_STATIC_JAVA_LIBRARIES :=

include $(BUILD_PACKAGE)

4、编译
在Android源码目录下执行：

./build/envsetup.sh
mmm /home/administrator/workspace/android_test/led/

执行结果：

Install: out/target/product/generic/system/app/led.apk

编译Android系统可执行命令

Android系统允许开发者，自己编写"ls"这样的命令放到Android系统中。

1、编写C文件:mycmd.c

#include <stdio.h> 
 
int main(int argc, char **argv) 
{ 
  printf("This is my command!\n"); 
  return 0; 
} 

2、编写Android.mk文件

LOCAL_PATH   := $(call my-dir) 
 
LOCAL_SRC_FILES := mycmd.c 
LOCAL_MODULE  := mycmd 
LOCAL_MODULE_TAGS := mycmd 
LOCAL_SHARED_LIBRARIES := libc 
LOCAL_STATIC_LIBRARIES := 
 
include $(BUILD_EXECUTABLE)  

3、编译

mmm /home/administrator/workspace/android_test/mycmd/

编译完成后信息：

 Install: out/target/product/generic/system/bin/mycmd