code: func (c *Client) DialFunc() func(network, addr string) (net.Conn, error) {
  	if c.useTLS() {
  		return nil
  	}
  	if android.IsChild() {
  		return func(network, addr string) (net.Conn, error) {
  			return android.Dial(network, addr)
  		}
  	}
  	return nil
  }
docs: // DialFunc returns the adequate dial function when we're on android.