Disassemble & assemble android apk

1.    download smali,smali.jar,baksmali,baksmali.jar
2.    move those file to the folder where the android sdk is

cp smali* android-sdk/tools
cp baksmali* andorid-sdk/tools

3.    unzip the apk file

unzip xxx.apk

     there will be files and directories:

AndroidManifest.xml
classes.dex
META-INF resources.arsc
assets
com
res

4.    disassemble the .dex file

baksmali xxx.dex

     This will generate an out folder
     from the out folder, there are some .smali files that should be traced and modified
5.    assemble the smali code to dex file

smali out  

6.    generate the key to sign the repacked apk file
     use keytool.exe under java jdk
     in the CMD, switch to the java sdk folder

keytool -genkey -v -keystore keystore-name.keystore -alias alias-name -keyalg RSA -keysize 2048 -validity 10000

     enter the password of your keystore

Enter key password for keystore-name.keystore
RETURE if the same as keystore password:

     the password is to encrypt your private key
7.    sign the repacked apk fild

jarsigner -verbose -sigalg MD5withRSA -digestalg SHA1 -keystore keysotre-name.keystore -signedjar apk_signed.apk your_repacked_apk.apk alias_name

8.    check if the sign is valid

jarsigner -verify apk-signed.apk

reference:

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

Android Sandbox_static analysis_aapt tool

1. set Android path to PATH

export PATH=$PATH:/android-sdk-path/sdk/platform-tools
export PATH=$PATH:/android-sdk-path/sdk/build-tools/android-4.3

2. use AAPT tool to know the permissions and sdk version of an APK file

###AAPT is in /android-sdk-path/sdk/build-tools/android-4.3/aapt###
aapt d permissions file.apk
aapt d badging file.apk | grep 'sdkversion'

3. 目前是用shell script完成，接下來需porting成python
4. reference of AAPT tool

Android emulator on Linux

OS : Ubuntu 12.04 32-bit

Install android-sdk

1. apt-get install libgl1-mesa-dev
2. apt-get install openjdk-6-jdk
3. download Android SDK or ADT Bundle form here
4. unzip android-sdk.zip
5. export PATH=$PATH:/path/to/tools:/path/to/platform-tools

Update android-sdk

1. cd android-sdk/tools
2. ./android update sdk
3. in the AVD manager, set the update proxy (Tools -> Options)
4. ./android ( in the AVD manager, new an emulator)
5. cd adnroid-sdk/tools
6. ./emulator @emulator-name

Set PATH

1. echo 'export PATH=$PATH:/new path' >> ~/.bashrc
2. logout