Mobile App Development With Kivy & Python 3 (part 2 android release + sign and zipalign, publish)
So, folder for kivy project is zenseeker.
Buildozer init (get spec and modify it)
buildozer -v android debug
Move the apk to the phone and debug it if needed with adb logcat (press install and check the logs)
It works? Good, then get ready for keytool (save the password and alias) and signing with jarsigner.
But read this first, Publish your app:
https://developer.android.com/studio/publish
mkdir ~/keystores/
keytool -genkey -v -keystore ~/keystores/.keystore -alias -keyalg RSA -keysize 2048 -validity 10000
So then we have a keystore, cool
Next up
Open a cmd, navigate to project where the buildozer.spec is
buildozer -v android release (not not use the EXPORT keys from keystore)
This will create and usigned.apk (zenseeker-release-unsigned.apk)
Move that apk (test before signing) to the phone and install it, it works? Great, next
Cd to that folder
espen@espen-UN65U:~/project/learnkivy/learn/zenseeker/.buildozer/android/platform/build/dists/zenseeker/build/outputs/apk/release
Then run jarsigner on that file
jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore ~/keystores/zen_nutshell.keystore zenseeker-release-unsigned.apk zen_nutshell_alias
Then verify the jar
jarsigner -verify zenseeker-release-unsigned.apk
jarsigner -verify -verbose -certs zenseeker-release-unsigned.apk
Move the zenseeker-release-unsigned.apk to the phone and test it, if it works, then it is success.
Then run zipalign from android (check where it is)
espen@espen-UN65U:~/.buildozer/android/platform/android-sdk/build-tools/29.0.2
espen@espen-UN65U:~/.buildozer/android/platform/android-sdk/build-tools/29.0.2$ zipalign -v 4 ~/project/learnkivy/learn/zenseeker/.buildozer/android/platform/build/dists/zenseeker/build/outputs/apk/release/zenseeker-release-unsigned.apk ~/Desktop/zenseeker.apk
Move the new zenseeker.apk to the phone and install it (it is now optimized, so should load quick), if it works, then ready for play store…..
