usb驅(qū)動(dòng)來源https://github.com/jiangdongguo/AndroidUSBCamera
android8以下沒有問題彼乌；華為8x升級(jí)到android9之后發(fā)現(xiàn)不能連接攝像頭，發(fā)現(xiàn)主要是協(xié)議過濾和獲取到的不匹配：
華為8x為例：
android8 返回的是class =239 subClass = 2
android9 返回的是class =14 subClass = 9
適配：
1洋访、修改

image.png

<usb>
    <usb-device class="239" subclass="2" /> <!-- all device of UVC -->
    <usb-device class="14" subclass="9" /> <!-- 華為8x of UVC -->
    <usb-device class="2" subclass="0" />
</usb>

2贤斜、修改UVCCameraHelper.java

  public List<UsbDevice> getUsbDeviceList() {       
        List<DeviceFilter> deviceFilters = DeviceFilter
                .getDeviceFilters(context, R.xml.device_filter);
        if (mUSBMonitor == null || deviceFilters == null)
            return null;
        //獲取多個(gè)設(shè)備過濾條件;之前只返回了第一個(gè)
        return mUSBMonitor.getDeviceList(deviceFilters);
    }

3裕寨、修改USBMonitor.java

    public List<UsbDevice> getDeviceList(final List<DeviceFilter> filters) throws IllegalStateException {
        if (destroyed) throw new IllegalStateException("already destroyed");
        final HashMap<String, UsbDevice> deviceList = mUsbManager.getDeviceList();
        final List<UsbDevice> result = new ArrayList<UsbDevice>();
        if (deviceList != null) {
            if ((filters == null) || filters.isEmpty()) {
                result.addAll(deviceList.values());
            } else {
                for (final UsbDevice device : deviceList.values()) {
                    for (final DeviceFilter filter : filters) {
                        //增加判斷filter.mSubclass == device.getDeviceSubclass()
                        if (((filter != null) && filter.matches(device)) || (filter != null && filter.mSubclass == device.getDeviceSubclass())) {
                            // when filter matches
                            if (!filter.isExclude) {
                                result.add(device);
                            }
                            break;
                        }
                    }
                }
            }
        }
        return result;
    }

4楼熄、如果還發(fā)現(xiàn)有其他的class 和 subClass 直接添加在配置文件中既可
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