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Editorial Team
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Asked: 2026-06-10T00:06:48+00:00

I am developing an Android application in which I have to communicate to an

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I am developing an Android application in which I have to communicate to an USB device. I tried to use standart google API in my app, but list of devices is allways empty.

Same things if i use USB device info with google api. List of devices searched by google api is empty,

lsusb gives following results:

Bus 001 Device 001: ID 1d6b:0001
Bus 002 Device 001: ID 1d6b:0002
Bus 003 Device 001: ID 1d6b:0001
Bus 002 Device 002: ID 2226:0014

my device is 2226:0014

log of eclipse:

I/USB3G(92): event { 'add', '/devices/platform/sw-ehci.1/usb2/2-1', 'usb', '', 189, 133 }
I/USB3G(92): path : '/sys/devices/platform/sw-ehci.1/usb2/2-1'
I/USB3G(92): VID :size 5,vid_path '/sys/devices/platform/sw-ehci.1/usb2/2-1/idVendor',VID  '2226
I/USB3G(92): '.
I/USB3G(92): PID :size 5,Pid_path '/sys/devices/platform/sw-ehci.1/usb2/2-1/idProduct',PID  '0014
I/USB3G(92): '.
I/USB3G(92): cmd=/system/etc/usb_modeswitch.sh /system/etc/usb_modeswitch.d/2226_0014 &,
I/USB3G(92): excute ret : 0,err:No such file or directory

If i plug in devices like rs232 adapters, bluetooth dongle, nothing happens,and there is no any result from API and lsusb.

Prtocol of a device is based on ezusb library.
Android v.: 4.0.3
kernel v.: 3.0.8
firmware build: crane_evb-eng 4.0.3 IMLK74k 20120330

Is there are any way to access hidden USB devices via API, or should i implement support of this device by writing driver and patching it into the firmware?

UPDATE: even if i create info file in *system/etc/usb_modeswitch.d/* with name 2226_0014
containing 

DefaultVendor= 0x2226
DefaultProduct=0x0014
TargetVendor=  0x2226
TargetProductList="0014"
MessageEndpoint="0x00"
NeedResponse=1
CheckSuccess=20

i get the same error: “No such file or directory”

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1 Answer

  1. Editorial Team

    To enable USB host API support you should add a file named
    android.hardware.usb.host.xml
    and containing the following lines:

    <permissions>
 <feature name="android.hardware.usb.host"/>
</permissions>

    into folder

    /system/etc/permissions

    in that folder find file named

    handheld_core_hardware.xml or tablet_core_hardware.xml

    and add 

    <feature name="android.hardware.usb.host" />

    into <permissions> section.

    Reboot your device. Usb host api should work.

    Tested on CUBE U30GT with android 4.

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