How to make a signed .apk file

apksigner.sh

# 1. install Android Studio from https://developer.android.com/studio/?hl=ja

# 2. add PATH for the Android SDK
cat << 'EOS' >> ~/.zshrc
export ANDROID_HOME=$HOME/Library/Android/sdk
export PATH=$PATH:$ANDROID_HOME/tools
export PATH=$PATH:$ANDROID_HOME/tools/bin
export PATH=$PATH:$ANDROID_HOME/platform-tools
export PATH=$PATH:$ANDROID_HOME/build-tools/29.0.3
EOS

# 3. make a kestore file with keytool and check it
keytool -genkey -v -keystore ***.keystore -storepass *** -alias *** -keypass *** -keyalg RSA -validity 36500
keytool -list -v -keystore ***.keystore -storepass ***

# 4. Sign a apk file with apksigner
cd ~/Downloads/app/testflight
apksigner sign --ks ***.keystore -v --v2-signing-enabled true --ks-key-alias *** --ks-pass pass:*** ***.apk

# 5. Check the both fingerprints are the same
keytool -list -v -keystore ***.keystore -storepass ***
keytool -printcert -jarfile ***.apk

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# 1. fix versionCode and 
brew install apktool 
which apktool # /usr/local/bin/apktool

apktool d hoge.apk
vi hoge/apktool.yml (# fix versionCode)
apktool b hoge/ -o hoge.apk

zipalign -v -p 4 hoge.apk hoge_aligned.apk
apksigner sign --ks ***.keystore -v --v2-signing-enabled true --ks-key-alias *** --ks-pass pass:*** hoge_aligned.apk