UsbSerialProber.java 文件源码

/**
 * Finds and builds all possible {@link UsbSerialDriver UsbSerialDrivers}
 * from the currently-attached {@link UsbDevice} hierarchy. This method does
 * not require permission from the Android USB system, since it does not
 * open any of the devices.
 *
 * @param usbManager
 * @return a list, possibly empty, of all compatible drivers
 */
@Keep
public List<UsbSerialDriver> findAllDrivers(final UsbManager usbManager) {
    final List<UsbSerialDriver> result = new ArrayList<UsbSerialDriver>();
    HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
    Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
    while (deviceIterator.hasNext()) {
        UsbDevice usbDevice = deviceIterator.next();
        UsbSerialDriver driver = probeDevice(usbDevice);
        if (driver != null) {
            result.add(driver);
        }
    }
    return result;
}