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android.hardware.usb.UsbManager

UsbManager.getDeviceList

Top / UsbManager.getDeviceList

Returns a HashMap containing all USB devices currently attached. USB device name is the key for the returned HashMap. The result will be empty if no devices are attached, or if USB host mode is inactive or unsupported.

http://developer.android.com/intl/ja/reference/android/hardware/usb/UsbManager.html#getDeviceList()

Returns

• HashMap<String, UsbDevice>

実装

• http://tools.oesf.biz/android-5.1.1_r1.0/xref/frameworks/base/core/java/android/hardware/usb/UsbManager.java#240

メモ

• IUsbManager mService;.
  • com.android.server.usb.UsbService extends IUsbManager.Stub
• mService.getDeviceList?(bundle);

HIDのデバイスが列挙されない時がある

• http://tools.oesf.biz/android-5.1.1_r1.0/xref/frameworks/base/services/usb/java/com/android/server/usb/UsbHostManager.java#98
• com.android.server.usb.UsbHostManager

  /* returns true if the USB device should not be accessible by applications */
  private boolean isBlackListed(int clazz, int subClass, int protocol) {
      // blacklist hubs
      if (clazz == UsbConstants.USB_CLASS_HUB) return true;
  
      // blacklist HID boot devices (mouse and keyboard)
      if (clazz == UsbConstants.USB_CLASS_HID &&
              subClass == UsbConstants.USB_INTERFACE_SUBCLASS_BOOT) {
          return true;
      }
  
      return false;
  }

関連

• device_filter.xml