Chromium Blog
News and developments from the open source browser project
Build Chrome Packaged Apps with the MediaGalleries API
2012年11月20日火曜日
Many popular applications today help users consume, share, manage, and edit media content, as evidenced by the rise of web apps like
Google Play Music
and
YouTube
. For
Chrome packaged app developers
, the new
Media Galleries API
introduces a simple way for apps to access media stored on a user’s device (with the user’s permission, of course).
To use the API, you first have to determine what kind of permission your app needs to access user’s media:
read-only
: allows media content to be read, but not modified
read-write
: allows media content to be read and modified
add-files
: allows media to be added to the galleries but prevents modifying existing media files.
Currently, only read-only access is supported. Support for read-write and add-files will be introduced in a future release.
To retrieve media content, use
getMediaFilesystems()
. If this is the first time your app is accessing the user’s media libraries, the system will prompt the user to grant access:
You can also make your app explicitly ask the user to designate specific galleries. This is useful if, for example, your app is only interested in pictures. Once access is granted, your app can then retrieve a list of
LocalFileSystem
structures. At that point, you can use the
W3C FileSystem API
to access the media gallery content.
NOTE
: The file system APIs will only return files that the Chrome platform
natively supports
, and only the
asynchronous version
of the FileSystem API is currently supported.
We’re eager to see what great applications you will build with the Media Galleries API and the Chrome Packaged Apps platform. To get started, clone our
samples repository
and look at the Media Galleries
sample application
. Have questions or comments? Subscribe to
chromium-apps
and follow us on our
Google+ page
!
Posted by Joe Marini, Developer Advocate
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