独辟蹊径系列 带着大家玩Android(2)
在Android中使用谷歌自己开发的Java虚拟机内核技术(JVM),称为Dalvik,该Java虚拟机在Android手机上执行Java程序.谷歌表示,即使在手机的限制性硬件上,Dalvik也能使Java程序运行得很快.与我们通常使用的Java虚拟机的一个显着的区别就是,Android并不属于Sun公司在1999年成立的Java标准制定组织(Java Community Process, 简称JCP)的一部分.JCP负责处理和审批各种Java技术和技术规范,将新的Java特点系统化为应用程序编程接口(API).
在android/dalvik/libcore/dom/src/test/java/org/w3c/domts下有很多java源文件，这意味着编译Android之前需要先安装JDK。
下载jdk 1.5的地址 http://java.sun.com/products/archive/j2se/5.0_06/index.html
如果使用jdk1.6的版本将会出现如下的提示。
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-->============================================
Checking build tools versions...
************************************************************
You are attempting to build with the incorrect version of java.
Your version is: java version "1.6.0_17".
The correct version is: 1.5.
Please follow the machine setup instructions at http://source.android.com/download
将下载的jdk-1_5_0_06-linux-i586.bin复制到/usr/local/添加执行权限并执行安装
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-->chmod +x jdk-1_5_0_06-linux-i586.bin
./jdk-1_5_0_06-linux-i586.bin
安装后出现jdk1.5.0_06文件夹，编辑/etc/profile文件添加JAVA_HOME变量和其他的编译变量
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-->JAVA_HOME=/usr/local/jdk1.5.0_06
PATH=$PATH:$JAVA_HOME/bin
export JAVA_HOME
export ANDROID_JAVA_HOME=$JAVA_HOME
执行source /etc/profile获取新的环境变量信息，执行java -version查看当前的JDK版本。
3、编译前的准备工作， 准备Ubuntu 9.10必要的编译环境
准备Ubuntu9.10中的编译环境第一就是GCC的环境，需要安装build-essential这个软件包，同时要添加zlib1g-dev flexbison gperf libsdl-dev libesd0-dev libncurses5-dev libx11-dev等编译需要的软件包。
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-->apt-get -y install build-essential zlib1g-dev flex bison gperf libsdl-dev libesd0-dev libncurses5-dev libx11-dev
4、执行make命令开始编译
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-->root@ubuntu:~# make
target thumb C: libwnndict <= packages/inputmethods/OpenWnn/libs/libwnnDictionary/engine/ndldic.c
target thumb C: libwnndict <= packages/inputmethods/OpenWnn/libs/libwnnDictionary/engine/ndrdic.c
target thumb C: libwnndict <= packages/inputmethods/OpenWnn/libs/libwnnDictionary/engine/necode.c
target thumb C: libwnndict <= packages/inputmethods/OpenWnn/libs/libwnnDictionary/engine/ndcommon.c
target thumb C: libwnndict <= packages/inputmethods/OpenWnn/libs/libwnnDictionary/engine/nj_str.c
target SharedLib: libwnndict (out/target/product/generic/obj/SHARED_LIBRARIES/libwnndict_intermediates/LINKED/libwnndict.so)
target Non-prelinked: libwnndict (out/target/product/generic/symbols/system/lib/libwnndict.so)
target Strip: libwnndict (out/target/product/generic/obj/lib/libwnndict.so)
Generated: (out/target/product/generic/android-info.txt)
Target system fs image: out/target/product/generic/obj/PACKAGING/systemimage_unopt_intermediates/system.img
Install system fs image: out/target/product/generic/system.img
Target ram disk: out/target/product/generic/ramdisk.img
Target userdata fs image: out/target/product/generic/userdata.img
Installed file list: out/target/product/generic/installed-files.txt
出现上面的提示信息说明编译已经完成，同时会发现在代码目录下多了一个out目录。
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-->lvs@ubuntu:~$ ls
bianyi andorind.odt Desktop hardware prebuilt 模板 音乐
bionic development Makefile repo 视频 桌面
bootable examples.desktop myandroid system 图片
build external out vendor 文档
dalvik frameworks packages 公共的 下载
5、安装Android模拟器android-sdk-linux_x86
到google网站下载http://developer.android.com/sdk/index.html页面下载android-sdk_r04-linux_x86.tgz到/usr/local/并解压，加压后文件夹/usr/local/android-sdk-linux_86/tools/中包含有 emulator模拟器。
编辑/etc/profile添加模拟器执行环境变量
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--># Android emulator
PATH=”$PATH:/home/lvs/out/host/linux-x86/bin”
ANDROID_PRODUCT_OUT=/home/lvs/out/target/product/generic
export ANDROID_PRODUCT_OUT
启动模拟器
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-->root@ubuntu:~/out/target/product/generic#/usr/local/android-sdk-linux_86/tools/emulator -image system.img -datauserdata.img -ramdisk ramdisk.img