reciv with kivy -thearding - 不工作

Question

我用kivy做了一个应用程序，它在一个名为LoginScreen的类中向服务器发送数据，并从另一个名为Searchi的类中的服务器接收数据。

它不起作用，我真的不知道是什么问题而且我没有任何错误。

我的客户：

# kivy.require("1.8.0")
from kivy.app import App 
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.widget import Widget
from kivy.uix.textinput import TextInput  
from kivy.graphics import Line
from kivy.uix.button import Button
import socket
import threading

Builder.load_string("""
#: import FadeTransition kivy.uix.screenmanager.FadeTransition
<MenuScreen>:
    BoxLayout:
        Button:
            text: 'Sign Up'
            on_press:
                root.manager.transition.direction = 'left'
                root.manager.current = 'settings'
        Button:
            text: 'Login'
            on_press:
                root.manager.transition.direction = 'left'
                root.manager.current = 'settings'

<Searchi>:
    BoxLayout:
        Button:
            text: 'send massage'
            font_size: '20sp'
            size_hint: (0.4,0.111)
            pos_hint: {'y': 0,'x':0.6}
            on_press:
                root.manager.transition.direction = 'right'
                root.manager.current = 'settings'


<SettingsScreen>:
     BoxLayout:
         FloatLayout:
            LoginScreen
            Button:
                font_size: '20sp'
                size_hint: (0.4,0.111)
                pos_hint: {'y': 0,'x':0.6}
                text: 'Back to menu'
                on_press:
                     root.manager.transition.direction = 'right'
                     root.manager.current = 'menu'
""")


class LoginScreen(GridLayout):
    def __init__(self, **kwargs):
        super(LoginScreen, self).__init__(**kwargs)
        self.cols = 2


        self.add_widget(Label(text='username'))
        self.username = TextInput(multiline=False)
        self.add_widget(self.username)

        self.add_widget(Label(text='Password'))
        self.password = TextInput(multiline=False, password=True)
        self.add_widget(self.password)

        self.submit_button = Button(text='sumbit',size_hint=(.5, 
.25),font_size=20)
        self.submit_button.bind(on_press=self.submit_username)
        self.add_widget(self.submit_button)

    def submit_username(self, *args):
        send_data(self.username.text)
        sm.current = 'searchi'
        sm.transition.direction = 'left'

def send_data(name):
    my_socket = socket.socket()
    my_socket.connect(('127.0.0.1', 8088))
    my_socket.send(name.encode('utf-8'))
    my_socket.close()

def recv_data():
    my_socket = socket.socket()
    my_socket.connect(('127.0.0.1', 8085))
    name=my_socket.recv(1024)
    msg = name.decode('utf-8')
    my_socket.close()
    return msg

# Declare both screens
class MenuScreen(Screen):
    pass

class SettingsScreen(Screen):
    pass

 class Searchi(Screen):
     def __init__(self, **kwargs):
         super(Searchi, self).__init__(**kwargs)
         self.msg=threading.Thread(target=recv_data).start()
         self.add_widget(self.msg)


 # Create the screen manager
 sm = ScreenManager()
 sm.add_widget(MenuScreen(name='menu'))
 sm.add_widget(Searchi(name='searchi'))
 sm.add_widget(SettingsScreen(name='settings'))

class TestApp(App):
     def build(self):
          return sm

if __name__ == '__main__':
     TestApp().run()

我的服务器：

import socket
import db      # import my db
import threading


server_socket = socket.socket()
server_socket.bind(('127.0.0.1',8088))
server_socket.listen(5)


oldmsg = ""
while(True):
     (client_socket, client_address) = server_socket.accept()
     client_username = client_socket.recv(1024)
     msg = client_username.decode('utf-8')
     print(msg)

     if msg != oldmsg:
         db.data_entry_login(msg, "dsfsds", "dsfsfsdd", "2")  # insert to my db
        oldmsg=msg
        client_socket.send(msg.encode('utf-8'))