1. Generate Android APK package signing certificate
1). Switch to the bin directory of jdk in doc
cd C:\Program Files\Java\jdk1.6.0_18\bin
2). Run the following command
keytool –genkey –alias android123.keystore –keyalg RSA –validity 20000 –keystore android123.keystore
/* Explanation: The keytool tool is the certificate tool that comes with the Java JDK
The -genkey parameter means: to generate a certificate (copyright, identity security certificate)
The -alias parameter indicates that the certificate has an alias, and -alias mine.keystore indicates that the certificate alias is : mine
-keyalg RSA indicates the encryption type, RSA indicates that encryption is required to prevent others from stealing
-validity 20000 means valid for 20000 days (K3
-keystore mine123.keystore indicates that the name of the certificate to be generated is mine123
*/
After entering the carriage return, the screen displays: : a4 x: O. i5 I
Enter the keystore password: [ password will not be echoed ] (usually it is recommended to use 20 digits, it is best to write it down and use it later)
Enter the new password again: [ password not echoed ] ( o' ^$ _( F( K& I0
What is your first and last name?
[Unknown] ： lili # E # C/ Z! O) I; K6 r7 M-
What is your organizational unit name?
[Unknown]：snoopy' |3 v& I! _/ l
What is the name of your organization?
[Unknown]：snoopy team
What is the name of your city or area? ) L# V' |. E0 f; {
[Unknown]：beijing
What is the name of your state or province?
[Unknown]：beijing
What is the two-letter country code for this unit
[Unknown]：CN- m. ~1 W. i0
CN=lili, U=snoopy, O=snoopy team, L=beijing, ST=beijing, C=CN正确吗？
[否]：Y
输入< mine.keystore>的主密码
（如果和keystore密码相同，按回车）：
查看C:\Program Files\Java\jdk1.6.0_18\bin，生成了以后签名用的证书Key：mine123.keystore
2. 删除之前的签名文件
1). 用解压工具解压缩apk文件（如：解压到D:\Sign\PhoneBook）
压缩包内容解析：
(1) META-INF目录：存放签名后的CERT和MANIFEST文件，用于识别软件的签名及版权。
(2) res目录：存放各种Android原始资源，包括：动画anim、图片drawable、布局layout、menu菜单、xml等等
(3) AndroidManifest.xml编码后的Android项目描述文件，包括了Android项目的名称、版本、权限、程序组件描述等等
(4) classes.dex编译后Class被dx程序转换成Dalvik虚拟机的可执行字节码文件
(5) qresources.arsc所有文本资源的编译产物，里面包含了各Location对应的字符串资源。
2). 找到下面的目录META-INF，删除目录META-INF
3). 将PhoneBook整个文件夹用zip工具，重新打包成zip压缩包，然后更改后缀为apk (注意：产生的PhoneBook.zip中没有二级根目录)
3. 重新签名APK文件
1). 将证书复制到与需要重新签名的apk文件相同的目录下（如：复制到D:\Sign）
2). 在doc中切换到需要重新前面的apk文件的目录下
cd D:\Sign
3). 运行下面的命令
jarsigner –verbose –keystore mine123.keystore –signedjar PhoneBook_signed.apk PhoneBook.apk mine.keystore
/*解释：* ^, {& k1 Z. M* P/ M+ K5 n5 hjarsigner是Java的签名工具# K8 ~% s# Y. @6 P
-verbose参数表示：显示出签名详细信息
-keystore表示使用当前目录中的mine123.keystore签名证书文件。
-signedjarPhoneBook_signed.apk表示签名后生成的APK名称，% v! a7 e2 v4 W# ]; GPhoneBook.apk表示未签名的APK Android软件， mine.keystore表示别名
*/
输入完回车后屏幕如下图显示：
查看D:\Sign目录，已生成重新签名后的PhoneBook_signed.apk文件
