转：http://www.cnblogs.com/MichaelGuan/archive/2011/10/25/2224578.html
apktool: 可以解析资源文件，比如布局文件xml等，方便查看。
使用方法：
Apktool v1.4.1 - a tool for reengineering Android apk files
Copyright 2010 Ryszard Wi?niewski <brut.alll@gmail.com>
Apache License 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
Usage: apktool [-v|--verbose] COMMAND [...]
COMMANDs are:
d[ecode] [OPTS] <file.apk> [<dir>]
Decode <file.apk> to <dir>.
OPTS:
-s, --no-src
Do not decode sources.
-r, --no-res
Do not decode resources.
-d, --debug
Decode in debug mode. Check project page for more info.
-f, --force
Force delete destination directory.
-t <tag>, --frame-tag <tag>
Try to use framework files tagged by <tag>.
--keep-broken-res
Use if there was an error and some resources were dropped, e.g.:
"Invalid config flags detected. Dropping resources", but you
want to decode them anyway, even with errors. You will have to
fix them manually before building.
b[uild] [OPTS] [<app_path>] [<out_file>]
Build an apk from already decoded application located in <app_path>.
It will automatically detect, whether files was changed and perform
needed steps only.
If you omit <app_path> then current directory will be used.
If you omit <out_file> then <app_path>/dist/<name_of_original.apk>
will be used.
OPTS:
-f, --force-all
Skip changes detection and build all files.
-d, --debug
Build in debug mode. Check project page for more info.
if|install-framework <framework.apk> [<tag>]
Install framework file to your system.
Copyright 2010 Ryszard Wi?niewski <brut.alll@gmail.com>
Apache License 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
Usage: apktool [-v|--verbose] COMMAND [...]
COMMANDs are:
d[ecode] [OPTS] <file.apk> [<dir>]
Decode <file.apk> to <dir>.
OPTS:
-s, --no-src
Do not decode sources.
-r, --no-res
Do not decode resources.
-d, --debug
Decode in debug mode. Check project page for more info.
-f, --force
Force delete destination directory.
-t <tag>, --frame-tag <tag>
Try to use framework files tagged by <tag>.
--keep-broken-res
Use if there was an error and some resources were dropped, e.g.:
"Invalid config flags detected. Dropping resources", but you
want to decode them anyway, even with errors. You will have to
fix them manually before building.
b[uild] [OPTS] [<app_path>] [<out_file>]
Build an apk from already decoded application located in <app_path>.
It will automatically detect, whether files was changed and perform
needed steps only.
If you omit <app_path> then current directory will be used.
If you omit <out_file> then <app_path>/dist/<name_of_original.apk>
will be used.
OPTS:
-f, --force-all
Skip changes detection and build all files.
-d, --debug
Build in debug mode. Check project page for more info.
if|install-framework <framework.apk> [<tag>]
Install framework file to your system.
dex2jar:可以将dex文件转换成jar文件
用法：
1.将apk文件后缀改成rar，然后解压，取出其中的class.dex，放到任意位置；
2.进入cmd，cd到dex2jar所在文件夹，输入命令dex2jar.bat %class.dex所在目录%class.dex
3. 命令完成后在%class.dex所在目录%就会生成jar文件
jd_gui:能够将jar文件反编译成java代码
用法:
打开jd_gui,然后将jar包拖放到主界面，就可以看到源代码了。