This is NOT an “Android hacker HOW-TO”. This is only a quick reference for myself.

• Step 1 : decompile APK using apktool d -f -r app_name.apk
• Step 2 : delete the original apk
• Step 2 : Modify SMALI files
• Step 3 : Rebuild apk using apktool b app_name
• Step 4 : Generate a signing key with keytool -genkey -keystore test.keystore -validity 10000 -alias test
• Step 5 : Sign the new APK jarsigner -keystore test.keystore -verbose app_name.apk test
• Step 7 : Install apk and enjoy!

apktool d -f -r app_name.apk
delete app_name.apk
--- modify smali files ---
apktool b app_name -o app_name.apk
keytool -genkey -keystore test.keystore -validity 10000 -alias test
zipalign -v 4 app_name.apk app_name_aligned.apk
apksigner sign --ks test.keystore --out app_name_aligned.apk app_name_signed.apk
adb install -r app_name_signed.apk

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