See title. If twitter app is installed, sending a tweet is trivial, since the username and password is retrieved from settings. When it is not installed, the icon is removed from activity dialog box.
The method Social.isTwitterSupported() should check that internally for you. If it is false, you need a custom logic for a fallback handling (e.g. a webview for sharing).
See title. If twitter app is installed, sending a tweet is trivial, since the username and password is retrieved from settings. When it is not installed, the icon is removed from activity dialog box.