ABC 2011 Summer のデ部によるHoneycomb API解説での担当分その２ 3.1で追加されたMTPについて、実装時にひっかかりそうな部分を中心に解説

1. MTP API for integrating with
external cameras

2. MTP
MTP = Media Transfer Protocol
PC
USB Mass Storage

3. MTP
( )

4. MtpConstants MTP (
)
MtpDevice MTP
MtpDeviceInfo MTP
ID
MtpObjectInfo MTP
MtpStorageInfo MTP

5. MTP
USB
USB MtpDevice
USB MtpDevice
open
MTP

6. MTP
AndroidManifet.xml
<!-- USB Host API -->
xml/device_filter.xml
<!-- -->
<!-- 6 ( UsbConstants) -->
<usb-device class=”6” />
<!-- -->
UsbDevice device = (UsbDevice) intent.getParcelableExtra(...);
UsbDeviceConnection conn = mUsbManager.openDevice(device);
MtpDevice mtpDevice = new MtpDevice(device);
mtpDevice.open(conn); //

7. int[] storageIds = mtpDevice.getStorageIds();
for (int storageId : storageIds) {
//
}

8. //
//
int[] objectHandles = mtpDevice.getObjectHandles(storageId,
0, // (0 )
0 // (0 ));
for (int objectHandle : objectHandles) {
MtpObjectInfo objectInfo = mtpDevice.getObjectInfo();
if (mtpObjectInfo.getAssociType()
== MtpConstants.ASSOCIATION_TYPE_GENERIC_FOLDER) {
//
} else {
//
}
}

9. Tips
UI MTP
UI
( )
Cybershot DSC-HX5 30msec
iPhone4 10msec

10. Tips (cont’d)
MTP
( )
iPhone
)
Galaxy S(Win7 PC ) Mass Storage
( )

11. Tips (cont’d)
MtpDevice
raw byte

12. Honeycomb 3.2
Media Framework
Applications that use the platform's media provider (MediaStore)
can now read media data directly from the removeable SD card,
where supported by the device. Applications can also interact with the
SD card files directly, using the MTP API.
media provider (MediaStore)
SD
MTP API SD

13. Honeycomb 3.1 MTP Galaxy S
Motorola XOOM
2 DEVICE_ATTACHED
1 UsbDeviceConnection
2 MtpDevice
(new )

14. WEB