am指令的Android.mk

android的am指令實際上是透過一個prebuilt的shell script來啟動一個java程式

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := am

LOCAL_SRC_FILES := am

LOCAL_MODULE_CLASS := EXECUTABLES

LOCAL_MODULE_TAGS := optional

include $(BUILD_PREBUILT)

Android系統跑java程式的shell script

#!/system/bin/sh

# Script to start "am" on the device, which has a very rudimentary

# shell.

base=/system

export CLASSPATH=$base/framework/am.jar

exec app_process $base/bin com.android.commands.am.Am "$@"

啟動的am java程式

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_SRC_FILES := $(call all-subdir-java-files)

LOCAL_MODULE := am

include $(BUILD_JAVA_LIBRARY)

你的純Java程式也能透過這種方式編譯與啟動