Richer access to secondary shared storage devices

In KitKat we introduced APIs that let apps read/write file in app-specific directories on secondary
storage devices, such as SD cards.

We heard loud and clear that developers wanted richer access beyond these directories, so in
Lollipop we added the new ACTION_OPEN_DOCUMENT_TREE intent. Apps can launch this intent to pick
and return a directory from any supported DocumentProvider, including any of the shared storage
supported by the device. Apps can then create, update, and delete files and directories anywhere
under the picked tree without any additional user interaction. Just like the other document
intents, apps can persist this access across reboots.
https://plus.google.com/+JeffSharkey/posts/4kxjY9JFemL

http://developer.android.com/about/versions/android-5.0.html#Storage

SDカードへの書き込みｸﾙ━━━━(ﾟ∀ﾟ)━━━━??