Beginning NFC by Tom Igoe Don Coleman & Brian Jepson

Author:Tom Igoe, Don Coleman & Brian Jepson
Language: eng
Format: epub
ISBN: 9781449372064
Publisher: O’Reilly Media, Inc.
Published: 2014-09-01T04:00:00+00:00

Music User Interface Event Handlers

Now that the lighting user interface elements are taken care of, it’s time to write the event handlers for the music playback. Figure 6-6 shows a detail of those controls.

Figure 6-6. The music controls for the app

The first music event handler to write is the getSongs() handler. This handler is called in the onDeviceReady() handler. It uses PhoneGap’s File API to read the directory listing of the music directory and get a list of all the song names and URIs to populate the music selector in the UI.

This function is heavily dependent on callbacks, so it helps to start reading it from the bottom. It starts by looking for the directory using resolveLocalFileSystemURI(), and when that succeeds, it calls foundDirectory(). That looks for the directory entries, and when it succeeds, it calls foundFiles() to fill the selector in the HTML. There’s a common failure handler for all of these in case they fail: an alert box pops up with the cause of the failure.

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