Commands to build a signed APK in terminal for react_native project

build_apk.bash

#start react-native in port 8088
$ react-native start --port=8088

#download the bundle of android know bug in react-native
$ curl http://localhost:8088/index.android.bundle?platform=android

#inside react-native's android project build the assembleRelease flavor
$ ./gradlew assembleRelease

#go to the apk's android folder
$ cd app/build/outputs/apk/

#Use zipalign from build-tools of your prefer android API version
# $ <AndroidSDKBuildTools>/zipalign -v -p 4 <apkunsigned> <nameNewApk>
$ /Users/Gorro/Library/Android/sdk/build-tools/25.0.0/zipalign -v -p 4 app-release.apk app.apk

#Use apksigner from build-tools of your prefer android API version
# $ <AndroidSDKBuildTools>/apksigner sign --ks <AndroidkeystoreDirectory>/app.keystore <apkToSign>
$ /Users/Gorro/Library/Android/sdk/build-tools/25.0.0/apksigner sign --ks /Volumes/TowiHD/Repos/SAP/android/app/SAPRelease.keystore app.apk 

#Verify the output apk
# $ <AndroidSDKBuildTools>/apksigner verify <apk>
$ /Users/Gorro/Library/Android/sdk/build-tools/25.0.0/apksigner verify app.apk 

#User jarsigner to sign the jar/apk
# $ jarsigner -verbose -keystore <AndroidkeystoreDirectory>/app.keystore <apkToSign> <KeystoreAlias>
$ jarsigner -verbose -keystore /Volumes/TowiHD/Repos/SAP/android/app/SAPRelease.keystore app.apk SAPRelease

#Re zipalign to upload to playstore
/Users/Gorro/Library/Android/sdk/build-tools/25.0.0/zipalign -v -p 4 app.apk app_release_signed.apk

#install the apk to verify the app
# $ adb install <apk>
$ adb install app.apk