all about android reverse engineering
>> adb shell pm list packages
>> abd pull /data/app/apkfile.apk
>> adb install apkfile.apk
>> adb uninstall apkfile.apk
apktool d apkfile.apk -o apkfolder
apktool b apkfolder
keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000
jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore app-debug.apk alias_name