I would like to add custom actions on this menu in my project. But cannot find any documentation on how this is accessible.

CodePudding user response：

You are looking for Universal actions

• Those are being specified in the Addon manifest
• The Universal actions contain labels (the menu entries you see in the three-dot menu) and are tied to either an openLink or runFunction action - depending on your intention

Sample manifest from the documentation:

 "oauthScopes": [
    "https://www.googleapis.com/auth/gmail.addons.current.message.metadata"
  ],
  "addOns": {
    "common": {
      "name": "Universal Actions Only Addon",
      "logoUrl": "https://www.example.com/hosted/images/2x/my-icon.png",
      "openLinkUrlPrefixes": [
        "https://www.google.com",
        "https://www.example.com/urlbase"
      ],
      "universalActions": [{
          "label": "Open google.com",
          "openLink": "https://www.google.com"
        }, {
          "label": "Open contact URL",
          "runFunction": "openContactURL"
        }, {
          "label": "Open settings",
          "runFunction": "createSettingsResponse"
        }, {
          "label": "Run background sync",
          "runFunction": "runBackgroundSync"
      }],
      ...
    },
    "gmail": {
      "contextualTriggers": [
        {
          "unconditional": {},
          "onTriggerFunction": "getContextualAddOn"
        }
      ]
    },
    ...
  },
  ...