SoundLoader 在 kivy 中重叠歌曲，python。如何在 python kivy 中代替其他歌曲播放歌曲？

Question

I have been developing an app using python and kivymd
This is a simple music player app which finds all the music in the phone and show it as a list
And when we click on the song name it will play the song But the problem is that the songs overlaps and then it keep on overlapping
What I want is that when we click on any other song the previous one stops and the clicked one starts to play

My previous code in which there is no stop function-:

from kivy.lang import Builder
from kivymd.uix.list import OneLineListItem
from kivymd.app import MDApp
from kivy.core.audio import SoundLoader
import os

helper_string = """
Screen:
    BoxLayout:
        orientation: "vertical"
        ScrollView:
            MDList:
                id: scroll

"""


class MainApp(MDApp):
    def build(self):
        screen = Builder.load_string(helper_string)
        return screen

    def on_start(self):
        for root, dirs, files in os.walk('C:/'):
            for file in files:
                if file.endswith('.mp3'):
                    required_file = file
                    the_location = os.path.abspath(required_file)
                    self.root.ids.scroll.add_widget(OneLineListItem(text=required_file, on_release=self.play_song))
                    # print(required_file)

    def play_song(self, onelinelistitem):
        # print('play:', onelinelistitem.text)
        the_song_path = os.path.abspath(onelinelistitem.text)
        sound = SoundLoader.load(the_song_path)
        if sound:
            sound.play()
        print(the_song_path)


MainApp().run()

My new code in which I tried a simple fix using the lists and it also did not worked -:

from kivy.lang import Builder
from kivymd.uix.list import OneLineListItem
from kivymd.app import MDApp
from kivy.core.audio import SoundLoader
import os

helper_string = """
Screen:
    BoxLayout:
        orientation: "vertical"
        ScrollView:
            MDList:
                id: scroll

"""


class MainApp(MDApp):
    def build(self):
        screen = Builder.load_string(helper_string)
        return screen

    def on_start(self):
        for root, dirs, files in os.walk('C:/'):
            for file in files:
                if file.endswith('.mp3'):
                    required_file = file
                    the_location = os.path.abspath(required_file)
                    self.root.ids.scroll.add_widget(OneLineListItem(text=required_file, on_release=self.play_song))
                    # print(required_file)

    def play_song(self, onelinelistitem):
        SongList = []
        # print('play:', onelinelistitem.text)
        the_song_path = onelinelistitem.secondary_text
        SongList.append(the_song_path)
        if len(SongList) == 1:
            sound = SoundLoader.load(SongList[0])
            if sound:
                sound.play()
            print(the_song_path)
        if len(SongList) > 1:
            SoundLoader.load(SongList[0]).stop()
            sound = SoundLoader.load(SongList[1])
            if sound:
                sound.play()
            print(the_song_path)


MainApp().run()

Yes I know that it was a very bad fix

So please can anyone help me out with this issue

Thank you Very Much in advance

Answer 1

您的 SongList 是方法 play_song() 中的局部变量，每次调用 play_song() 时都设置为 []。所以条件：

if len(SongList) > 1:

永远不会是真的。处理这个问题的一个简单方法是定义一个实例变量来保存当前播放的声音，我们称之为 self.sound。在build()方法中初始化：

def build(self):
    self.sound = None
    screen = Builder.load_string(helper_string)
    return screen

并在play_song()方法中使用：

def play_song(self, onelinelistitem):
    the_song_path = onelinelistitem.secondary_text
    if self.sound:
        self.sound.stop()
    self.sound = SoundLoader.load(the_song_path)
    if self.sound:
        self.sound.play()
    print(the_song_path)