Dedexer tool

1. Install oracle java 7

export http_proxy=
export https_proxy=
add-apt-repository ppa:webupd8team/java
apt-get update
apt-get install oracle-java7-installer

2. Download Dedexer tool
3. Decompile the class.dex file

unzip file.apk
java -jar dex.jar -d destination-directory source-class.dex