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Playing videos and music is a popular activity on Android devices. The Android framework provides MediaPlayer as a quick solution for playing media with minimal code, and the MediaCodec and MediaExtractor classes are provided for building custom media players. The open source project, ExoPlayer, is a solution between these two options, providing a pre-built player that you can extend.

ExoPlayer supports features not currently provided by MediaPlayer, including Dynamic adaptive streaming over HTTP (DASH), SmoothStreaming and Common Encryption. It's designed to be easy to customize and extend, allowing many components to be replaced with custom implementations. Because ExoPlayer is a library that you include in your application, it can be easily updated along with your app.

Note: ExoPlayer is an open source project that is not part of the Android framework and is distributed separately from the Android SDK. Visit the links below to find out more.