For this app, you'll build a simple media player app which will allow a user to retrieve audio files and play them.

• Add a button to post an intent to request a file.

  You can use .setType("audio/*") to specify which type of file to return

• Use MediaPlayer or VideoView to play the files as required

• Allow for basic controls:

  • Play/Pause
  • Display progress in track with a SeekBar
  • Allow user to use the SeekBar to move to different points in the track

• To call mediaPlayer.release() when you activity is stopped and create a new one in onStart

There are a few additional features which you can include in order to improve your app

• Allow users to select either audio or video files and play each one accordingly

  Use setType("video/*") to retreive a video

• Save each track persistently with the last played position to allow the user to pick up where they left off
• When tracks are added, add them to a list and allow the user to select previous tracks from that list
• Instead of an intent to retrieve the images, use that intent to request a directory using setType("file/*") then step through that directory to add all media files inside of it to your list.