Use a Youtube screen to show and promote your channel to the users of your app.
(Make sure you read this article to the end. There is some IMPORTANT INFORMATION)
All you need is just a web screen that has the predefined URL :
Finding your channel
You need to add either your channel or user ID. To find your channel ID just go to youtube.com once logged in your Google account. Select My Channel and copy it from the bar.
Setting the privacy correctly
Be sure that your channel is not set private by going to the users advanced settings on the upper right of the picture.
And then to the privacy settings where neither option should be set as private.
Finding your other Channel Settings
If you need additional data about your Youtube account, you can find some on the overview section and the advanced settings.
And there are more settings:
TIPS & TRICKS.
Videos in full screen:
Specifically if you are monetizing your app you cannot use youtube videos therefore Google assumes that you are competing to youtube ads or using their content to your benefit. If you try to publish you could get an email like this:
REASON FOR REMOVAL: Violation of section 4.4 (https://play.google.com/about/developer-distribution-agreement.html#prohibited) of the Developer Distribution Agreement.
After a regular review, we have determined that your app downloads, monetizes, or otherwise accesses YouTube videos in violation of theYouTube Terms of Service (http://www.youtube.com/t/terms) or YouTube API Terms of Service (https://developers.google.com/youtube/terms). Accessing content, a product, or service in an unauthorized manner is a violation of the Developer Distribution Agreement, and is not allowed on Google Play.
This particular app has been disabled as a policy strike. If your developer account is still in good standing, you may revise and upload a policy compliant version of this application as a new package name.
This notification also serves as notice for remaining, unsuspended violations in your catalog, and you may avoid further app suspensions by immediately unpublishing any apps in violation of (but not limited to) the above policy. Once you have resolved any existing violations, you may republish the app(s) at will. Before publishing applications, please ensure your apps’ compliance with the Developer Distribution Agreement (https://play.google.com/about/developer-distribution-agreement.html) and Content Policy (https://play.google.com/about/developer-content-policy.html).