elementary-sdk. Open your meson.build file and add the new dependency to the executable method.Gtk.Application with a correctly set application_id as we previously set up in Hello World.ninja to build your project. It should still build without any errors. If you do encounter errors, double check your changes and resolve them before continuing.granite in your build system and created a new Gtk.Application with an application_id, it's time to write some code.12 can be done with the following lines:set_badge_visible property to true, and use an int64 type for the set_badge property. The suffix .begin is required here since these are asynchronous methods.set_progress takes a double value type and is a range between 0 and 1: from 0% to 100%. As with badges, Don't forget that set_progress_visible must be true and .begin is required for asynchronous methods..desktop file does not involve writing any code or using any external dependencies, though your app needs a way to distinguish between actions, e.g. with command line flags.Actions line in your app's .desktop file. This line should contain a ; separated list of unique action names:Icon line is optional and should be an icon which represents the action that will be performed. The Exec line is required and should be your app's executable name and any command line argument required to trigger the action.-n or any other argument will not automatically make your app open a new window; your app must handle and interpret command line arguments. The GLib.Application API provides many examples and an extensive documentation on how to handle these arguments, particularly the command_line signal.