How to get the attached USB devices when you are using a USB hub?
My application connects to a USB device via OTG cable. It works fine when I attach it to the cable. When I restart the tablet and the device is still connected, it will recognize it after the tablet starts. No problem with this. The problem happens when I use a hub. My application will recognize the device when I attach it but won't recognize it after I restart the tablet, so I have to detach it and attach it again.
To find the attached devices I use this code:
Map<String, UsbDevice> connectedDevices = usbManager.getDeviceList();
UsbDevice usbDevice = null;
for (UsbDevice device : connectedDevices.values()) {
if (device.getVendorId() == 0x0000 && device.getProductId() == 0x0000) {
Log.i(TAG, "Device found: " + device.getDeviceName());
usbDevice = device;
break;
}
}
Has anyone had this problem?
android usb usb-otg asked Nov 15 '18 at 13:49
UallasUallas
5114
add a comment |
My application connects to a USB device via OTG cable. It works fine when I attach it to the cable. When I restart the tablet and the device is still connected, it will recognize it after the tablet starts. No problem with this. The problem happens when I use a hub. My application will recognize the device when I attach it but won't recognize it after I restart the tablet, so I have to detach it and attach it again.
To find the attached devices I use this code:
Map<String, UsbDevice> connectedDevices = usbManager.getDeviceList();
UsbDevice usbDevice = null;
for (UsbDevice device : connectedDevices.values()) {
if (device.getVendorId() == 0x0000 && device.getProductId() == 0x0000) {
Log.i(TAG, "Device found: " + device.getDeviceName());
usbDevice = device;
break;
}
}
Has anyone had this problem?
android usb usb-otg asked Nov 15 '18 at 13:49
UallasUallas
5114
add a comment |
My application connects to a USB device via OTG cable. It works fine when I attach it to the cable. When I restart the tablet and the device is still connected, it will recognize it after the tablet starts. No problem with this. The problem happens when I use a hub. My application will recognize the device when I attach it but won't recognize it after I restart the tablet, so I have to detach it and attach it again.
To find the attached devices I use this code:
Map<String, UsbDevice> connectedDevices = usbManager.getDeviceList();
UsbDevice usbDevice = null;
for (UsbDevice device : connectedDevices.values()) {
if (device.getVendorId() == 0x0000 && device.getProductId() == 0x0000) {
Log.i(TAG, "Device found: " + device.getDeviceName());
usbDevice = device;
break;
}
}
Has anyone had this problem?
android usb usb-otg asked Nov 15 '18 at 13:49
UallasUallas
5114
My application connects to a USB device via OTG cable. It works fine when I attach it to the cable. When I restart the tablet and the device is still connected, it will recognize it after the tablet starts. No problem with this. The problem happens when I use a hub. My application will recognize the device when I attach it but won't recognize it after I restart the tablet, so I have to detach it and attach it again.
To find the attached devices I use this code:
Map<String, UsbDevice> connectedDevices = usbManager.getDeviceList();
UsbDevice usbDevice = null;
for (UsbDevice device : connectedDevices.values()) {
if (device.getVendorId() == 0x0000 && device.getProductId() == 0x0000) {
Log.i(TAG, "Device found: " + device.getDeviceName());
usbDevice = device;
break;
}
}
Has anyone had this problem?
android usb usb-otg android usb usb-otg asked Nov 15 '18 at 13:49
UallasUallas
5114
asked Nov 15 '18 at 13:49
UallasUallas
5114
asked Nov 15 '18 at 13:49
UallasUallas
5114
asked Nov 15 '18 at 13:49
UallasUallas
5114
asked Nov 15 '18 at 13:49
UallasUallas
5114
5114
add a comment |
add a comment |
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