只要鼠标点击,kivymd屏幕就会变黑

我正在编写一个使用客户端-服务器架构的音乐流媒体平台。在客户端,我使用kivymd库来编写GUI。当流媒体播放时,客户端会显示一个屏幕,上面写着“立即流媒体播放”,还有播放和暂停按钮。出于某种原因,当流媒体发生时(工作正常),我们在“立即流媒体”屏幕上,如果用户的鼠标点击屏幕上的任何地方,无论是按钮还是其他地方,屏幕就会变黑。即使屏幕是黑色的,流媒体也不会停止——这首歌听得很好。

这是客户端流媒体屏幕的类:

class StreamingScreen(Screen):
global is_playing
is_playing = True

streaming_thread = None

def on_enter(self):
    self.streaming_thread = threading.Thread(target=self.play_song())
    # self.play_song()
    self.streaming_thread.start()
    print('started the thread')

def pause(self, *args):
    global is_playing
    print('pause pressed')
    is_playing = False
    # Send a pause command to the server
    client.send('PAUSE'.encode())

def resume(self):
    global is_playing
    print('resume pressed')
    is_playing = True
    # Send a resume command to the server
    client.send('RESUME'.encode())

def play_song(self):
    global is_playing

    client.send('GOOD'.encode(FORMAT))
    print('now playing song')

    # Stream song
    p = pyaudio.PyAudio()
    stream = p.open(format=p.get_format_from_width(2),
                    channels=2,
                    rate=44100,
                    output=True,
                    frames_per_buffer=CHUNK)

    data = b""
    payload_size = struct.calcsize("Q")

    while True:
        if is_playing:
            while len(data) < payload_size:
                packet = client.recv(4 * 1024)  # 4K
                if not packet:
                    break
                data += packet
            packed_msg_size = data[:payload_size]
            data = data[payload_size:]
            msg_size = struct.unpack("Q", packed_msg_size)[0]
            while len(data) < msg_size:
                data += client.recv(4 * 1024)
            frame_data = data[:msg_size]
            data = data[msg_size:]
            frame = pickle.loads(frame_data)
            print('writing to stream')
            stream.write(frame)
        elif not is_playing:
            # Pause the stream
            print('streaming paused')
            time.sleep(0.1)

负责流媒体屏幕的kv文件:

<StreamingScreen>:
name: 'streaming'

MDBoxLayout:
    orientation: 'vertical'
    spacing: '20dp'
    padding: '20dp'

    MDLabel:
        text: "Now streaming"
        font_style: "H2"
        theme_text_color: "Secondary"
        halign: 'center'

    MDBoxLayout:
        size_hint_y: None
        height: self.minimum_height

        MDFloatLayout:
            MDIconButton:
                icon: "arrow-left"
                theme_text_color: "Custom"
                text_color: (1, 1, 1, 1)
                size_hint: None, None
                size: '72dp', '72dp'
                pos_hint: {'center_x': 0.5, 'center_y': 0.5}
                radius: [36]
                md_bg_color: (0.5, 0, 0.5, 1)
                on_release:
                    root.manager.transition.direction = 'right'
                    app.navigation_draw()

        MDFloatLayout:
            MDIconButton:
                icon: "play"
                theme_text_color: "Custom"
                text_color: (1, 1, 1, 1)
                size_hint: None, None
                size: '96dp', '96dp'
                pos_hint: {'center_x': 0.5, 'center_y': 0.5}
                radius: [48]
                md_bg_color: (0.5, 0, 0.5, 1)
                on_press:
                    root.play()

        MDFloatLayout:
            MDIconButton:
                icon: "pause"
                theme_text_color: "Custom"
                text_color: (1, 1, 1, 1)
                size_hint: None, None
                size: '72dp', '72dp'
                pos_hint: {'center_x': 0.5, 'center_y': 0.5}
                radius: [36]
                md_bg_color: (0.5, 0, 0.5, 1)
                on_press:
                    root.pause()

当我按下“暂停”按钮时,甚至不会调用“暂停”功能。有些东西因为鼠标点击而崩溃,我不明白为什么。任何建议都将不胜感激!