Modifing apk

Modifing apk

# Modifing the APK

This instructions are for mac

Make sure you have java installed and you can access it from the terminal.

Head to apktool website and download the apktool jar and apktool.sh
https://ibotpeaches.github.io/Apktool/install/

Rename the jar to apktool.jar
Rename the apktool shell file to apktool
Move both the files to /usr/local/bin

sudo cp apktool.jar /usr/local/bin
sudo cp apktool /usr/local/bin

Permission to run
sudo chmod +x /usr/local/bin/apktool

Test the command on the terminal by typing apktool

For this example let's say we have test.apk

Decompile the apk using 
apktool d test.apk

You should see a folder with the code. 

Once you are done modifying compile it to apk again.

apktool b test
apktool b test/ -o test_unaligned.apk

Zipalign the zpk. You will need to move it to sdk/build-tools/buildtoolversion or add this to your path

cp test.apk sdk/build-tools/31.0.0

./zipalign -p -f 4 test_unaligned.apk test.apk

Now we need to create a keystore for sigining our apk.

keytool -genkey -v -keystore key.jks -keyalg RSA -keysize 2048 -validity 10000 -alias <your-alias>

for example

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

copy it to sdk/build-tools/buildtoolversion

cp test.keystore sdk/build-tools/31.0.0

then sign the apk

./apksigner sign --ks test.keystore test.apk