Metadata

Every app comes with two metadata files that we can generate using an online tool. Open AppStream Metainfo Creator and fill out the form with your app's info:

Don't worry about generating Meson snippets, as we'll cover that in the next section. After you select "Generate", you should have two resulting files that you can copy.

MetaInfo

First is a MetaInfo file. This file contains all the information needed to list your app in AppCenter. It should look something like this:

In your project's root, create a new folder called "data", and save your MetaInfo to a new file called "hello-again.metainfo.xml".

Screenshots

For the purposes of this tutorial, screenshots are optional, but they are required for publishing in AppCenter. Screenshots should only show your app on a transparent background and not contain any additional text or illustrations. You can use the caption tag to provide translatable and accessible descriptions of your screenshots.

Content Warnings

We use the standard to describe sensitive content that may be present in your app so that people using it can be informed and actively consent to seeing that content. OARS data is required and can be generated by taking :

Branding

You can also specify a brand color for your app by adding the branding tag inside the component tag. Colors must be in hexadecimal, starting with #. The background will automatically be given a slight gradient in your app's banner.

Monetization

If you want to monetize your app, you will need to add two keys inside a custom tag inside the component tag. Suggested prices should be in whole USD. You also must include your app's AppCenter Stripe key. This is a unique public key for each app and is not the same as your Stripe account's regular public key. You can connect your app to Stripe and receive a new key on the .

Releases

Your app must have a release tag for every version you wish to publish in AppCenter, including the initial release.

Desktop Entry

This file contains all the information needed to display your app in the Applications Menu and in the Dock. The one generated from AppStream Metainfo Creator looks something like this:

Copy the contents of your Desktop Entry and save it to the data folder you created earlier. Name this new file "hello-again.desktop".

Mark Your Progress

Each time we add a new file or make a significant change it's a good idea to commit a new revision and push to GitHub. Keep in mind that this acts as a backup system as well; when we push our work to GitHub, we know it's safe and we can always revert to a known good revision if we mess up later.

Add all of these files to git and commit a revision:

Now that we've got all these swanky files laying around, we need a way to tell the computer what to do with them. Ready for the next chapter? Let's do this!