FAQ.md

Q & A

1. Camera preview black screen?

First, check targetSdk version. If targetSdk>=28, you should grant the app android.permission.CAMERA permission and this solution will be resolved as usual. However, if it doesn't work, you have to set your targetSdk below 28 because it's custom system problem. Otherwise, issues to me and send me a email with your logs at location Android/data/com.jiangdg.ausbc/files if you have already get the uvc camera permission greanted dialog.

2. How to filter some device？

If your uvc device can not be recognised, maybe you can try like this:

First, create a flie named default_device_filter.xml in app xml directory(If not exist, please create it.).

then, copying the default value into it and adding your uvc device information.

<?xml version="1.0" encoding="utf-8"?>
<usb>
	<usb-device class="239" subclass="2" />	<!-- all device of UVC -->
	<!-- a few android 9.0 -->
	<usb-device class="14" subclass="9" />
	<usb-device class="2" subclass="0" />
	<usb-device class="6" subclass="-1" />
	<usb-device class="39" subclass="0" />
	<usb-device product-id="4836" vendor-id="9573" />
	<usb-device product-id="2229" vendor-id="1133" />
	<usb-device product-id="640" vendor-id="1409" />
	<usb-device product-id="258" vendor-id="9228" />
	<usb-device product-id="16981" vendor-id="19" />
    <!-- your uvc device -->
    <usb-device product-id="xxx" vendor-id="xxx" />
    <usb-device product-id="xxx" vendor-id="xxx" />
</usb>

3. There is a certain probability of being ANR when operatoring hot plug?

Please update to 3.2.7+ and this version has been optimized accordingly.