new AppUpdater(this)
       .setUpdateFrom(UpdateFrom.JSON)
       .setUpdateJSON("https://raw.githubusercontent.com/javiersantos/AppUpdater/master/app/update-changelog.json")
       .start();

https://raw.githubusercontent.com/javiersantos/AppUpdater/master/app/update-changelog.json

{
  "latestVersion": "1.2.2",
  "latestVersionCode": 10,
  "url": "https://github.com/javiersantos/AppUpdater/releases",
  "releaseNotes": [
    "- First evolution",
    "- Second evolution",
    "- Bug fixes"
  ]
}

latestVersion: required.

latestVersionCode: optional.

url: required.

releaseNotes: optional.

• If latestVersionCode is included in the JSON, latestVersion will only be used to display the latest version in the dialog and the versionCode will be used to compare the installed and latest update.