How to verify the signature of your *.apk file?

 The easiest way to do it using the keytool command.

Example:

keytool -printcert -jarfile <apk_file>

Supplied javaHome is not a valid folder. You supplied:

You hit this error message on Visual Studio Code (or Android Studio) for your IonicFramework project after you upgraded Java in your computer:

Supplied javaHome is not a valid folder. You supplied: <folder_name_with_path>

What Is The Solution?

a). Make sure Android Studio > Settings > Build, Execution, Deployment > Build Tools > Gradle > Gradle JDK is pointing to the correct JDK version. Save all for changes.

b). For Windows, go to this folder "C:\Users\<your_Windows_user_name>\.gradle", delete all of the files and folders.

c). Go to "<your_project_folder>\android\.gradle" folder, delete all of the files and folders.

d). Run the commands below as usual:

ionic build 

npx cap copy

npx cap sync

npx cap open android