Video app overview

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A typical video player always displays its controls and video content while it's running; it can't operate in the background or without a UI. Therefore, it's appropriate to build your app as a single activity containing the UI, a player, a media session, and a media controller:

video player activity

Building a videoplayer activity
How to create an activity that contains a media session and a media controller.
Media session callbacks
Describes how the media session callback methods manage the media session and other app components like notifications and broadcast receivers.
Compatible media transcoding
Set up transcoding behavior, such as whether to automatically convert videos to AVC (H.264) when they are opened by an app that doesn't support the initial encoding format.