Dear Sir:
I use "USB Device Info" App to test usb multi-devices by some Android
mobiles or PAD
Below is my steps
1. USB Hub with plugging 3 usb the-same devices
2. plug into Galaxy Nexus
3. Open "USB Device Info" App and switch to "Android" Page
4. unplug one usb device in order out of USB Hub(finally unplug all
devices)
5. plug usb device in order into USB Hub(finally plug into 3 devices)
6. unplug USB Hub out of Android mobiles or PAD
Below is my test devices and its response
1. Galaxy Nexus(with Android 4.0.3) => App will show normally
2. Galaxy Nexus(with Android 4.2.2) => It will hold USB-Hub message
after unplug USB Hub, if repeat plug/unplug it hold many messages for
USB-Hub
3. Nexus-7(with Android 4.1.1)/Galaxy S2(with Android 4.0.4) => It
can't detect USB-Hub, so no-device can't found. If plug usb device
directly into
Nexus-7/S2, it can be detected
Do you have any idea for this condition?
Why does it have the same and correct response for USB devices at all
Android mobiles or PAD???
Because they have the same and correct response, I can't use USB-HOST
API to find correct devices
Thank you for your advices
BR,
Alan
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