USB.java 文件源码

private void register() {
    IntentFilter usbFilter = new IntentFilter();
    usbFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
    usbFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
    usbFilter.addAction(ACTION_USB_PERMISSION);
    Activity activity = ctx.get();
    if (activity != null) {
        activity.registerReceiver(mUsbPermissionActionReceiver, usbFilter);
    }
}