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How to change the version number on an existing APK without re-building

This requires the latest version of apktool.

apktool d $APK_PATH -o $OUTPUT_FOLDER

# Open the apktool.yml text file
# Alter the versionCode and versionName entries

# now rebuild!
apktool build $OUTPUT_FOLDER 

# next you need to re-sign the apk with the original keystore file
jarsigner -verbose -keystore $KEYSTORE_PATH -storepass $KEYSTORE_PASSWORD -keypass $KEYSTORE_KEY_PASSWORD $APK_PATH $KEYSTORE_KEY_NAME
~/android-sdk/build-tools/21.1.1/zipalign  -v 4 $APK_PATH $APK_OUT_PATH
@KyleSforza
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How to resign the apk?

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