要捕获设备连接和断开的通知，可以使用以下方法：

1. 使用BroadcastReceiver：

public class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(UsbManager.ACTION_USB_DEVICE_ATTACHED)) {
            // 设备连接
            UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
            // 处理设备连接逻辑
        } else if (action.equals(UsbManager.ACTION_USB_DEVICE_DETACHED)) {
            // 设备断开
            UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
            // 处理设备断开逻辑
        }
    }
}

在Manifest文件中声明BroadcastReceiver：

2. 使用UsbManager：

UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
IntentFilter filter = new IntentFilter();
filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
registerReceiver(mUsbReceiver, filter);

private BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(UsbManager.ACTION_USB_DEVICE_ATTACHED)) {
            // 设备连接
            UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
            // 处理设备连接逻辑
        } else if (action.equals(UsbManager.ACTION_USB_DEVICE_DETACHED)) {
            // 设备断开
            UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
            // 处理设备断开逻辑
        }
    }
};

注意：在使用这两种方法之前，需要声明权限。另外，如果您是在Service中使用上述代码，需要替换getSystemService(Context.USB_SERVICE)为getApplicationContext().getSystemService(Context.USB_SERVICE)。