Install the App
Press Command+Space and type Terminal and press enter/return key.
Run in Terminal app:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null
and press enter/return key. 
If the screen prompts you to enter a password, please enter your Mac's user password to continue. When you type the password, it won't be displayed on screen, but the system would accept it. So just type your password and press ENTER/RETURN key. Then wait for the command to finish.
Run:
brew install dex2jar
Done! You can now use dex2jar.

 ✘XXXXX ~  d2j-dex2jar --help
d2j-dex2jar -- convert dex to jar
usage: d2j-dex2jar [options] <file0> [file1 ... fileN]
options:
 -d,--debug-info              translate debug info
 -e,--exception-file <file>   detail exception file, default is $current_dir/[fi
                              le-name]-error.zip
 -f,--force                   force overwrite
 -h,--help                    Print this help message
 -n,--not-handle-exception    not handle any exception throwed by dex2jar
 -nc,--no-code
 -o,--output <out-jar-file>   output .jar file, default is $current_dir/[file-na
                              me]-dex2jar.jar
 -os,--optmize-synchronized   optmize-synchronized
 -p,--print-ir                print ir to Syste.out
 -r,--reuse-reg               reuse regiter while generate java .class file
 -s                           same with --topological-sort/-ts
 -ts,--topological-sort       sort block by topological, that will generate more
                               readable code, default enabled
version: reader-2.0, translator-2.0, ir-2.0

Install the App
Press Command+Space and type Terminal and press enter/return key.
Run in Terminal app:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null ; brew install caskroom/cask/brew-cask 2> /dev/null
and press enter/return key. 
If the screen prompts you to enter a password, please enter your Mac's user password to continue. When you type the password, it won't be displayed on screen, but the system would accept it. So just type your password and press ENTER/RETURN key. Then wait for the command to finish.
Run:
brew cask install jd-gui **3.3 使用 JD-GUI**

Launch Terminal by pressing command+space, type terminal and hit Enter key.
Run
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null
Install
brew install jadx

jadx - dex to java decompiler, version: 0.7.1

usage: jadx [options] <input file> (.apk, .dex, .jar or .class)
options:
  -d, --output-dir      - output directory
  -ds, --output-dir-src - output directory for sources
  -dr, --output-dir-res - output directory for resources
  -r, --no-res          - do not decode resources
  -s, --no-src          - do not decompile source code
  -e, --export-gradle   - save as android gradle project
  -j, --threads-count   - processing threads count
  --show-bad-code       - show inconsistent code (incorrectly decompiled)
  --no-imports          - disable use of imports, always write entire package name
  --no-replace-consts   - don't replace constant value with matching constant field
  --escape-unicode      - escape non latin characters in strings (with \u)
  --deobf               - activate deobfuscation
  --deobf-min           - min length of name
  --deobf-max           - max length of name
  --deobf-rewrite-cfg   - force to save deobfuscation map
  --deobf-use-sourcename- use source file name as class name alias
  --cfg                 - save methods control flow graph to dot file
  --raw-cfg             - save methods control flow graph (use raw instructions)
  -f, --fallback        - make simple dump (using goto instead of 'if', 'for', etc)
  -v, --verbose         - verbose output
  --version             - print jadx version
  -h, --help            - print this help
Example:
  jadx -d out classes.dex //把dex文件编译为 java文件。

Install the App
Press Command+Space and type Terminal and press enter/return key.
Run in Terminal app:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null
and press enter/return key. 
If the screen prompts you to enter a password, please enter your Mac's user password to continue. When you type the password, it won't be displayed on screen, but the system would accept it. So just type your password and press ENTER/RETURN key. Then wait for the command to finish.
Run:
brew install apktool
Done! You can now use apktool.

//反编译 apk 到 当前目录下同名目录
$ apktool d testapp.apk

//编译 bar 目录 输出新的apk
$ apktool b bar -o new_bar.apk

java -jar ClassyShark.jar