如何在kivy python中使用滑块作为进度条和控制音频？ [英] how to use slider as progress bar and control audio in kivy python?

问题描述

我正在为Android制作一个音乐播放器，现在我成功地播放和暂停了这首歌，但
问题是，与Spotify或Google Play Music等其他音乐播放器应用程序一样，我们在底部有一个滑块
我们可以使用该滑块来控制当前正在播放的歌曲
所以关键是我想要做同样的事情，我想添加一个滑块，它的功能也像 我们可以使用进度条来控制歌曲播放。我尝试了一下，结果代码如下：

from kivymd.app import MDApp
from kivymd.uix.screen import Screen
from kivymd.uix.slider import MDSlider


class MusicApp(MDApp):

   def build(self):

          a = mixer.Sound(filename)
         
          slider = MDSlider(min=0,max=total_length,value = 0, 
                            pos_hint={'center_x':0.50,'center_y':0.6},  
                            size_hint=(0.6,0.1))

           screen = Screen()

           screen.add_widget(slider)
           return screen

MusicApp().run()

有人能帮我吗

预先谢谢😊😊

推荐答案

您可以将滑块用作进度条和控制器。下面是一些代码(基于您的代码)，可以做到这一点：

from kivy.clock import Clock
from kivy.core.audio import SoundLoader
from kivy.properties import ObjectProperty
from kivymd.app import MDApp
from kivymd.uix.screen import Screen
from kivymd.uix.slider import MDSlider


class MySlider(MDSlider):
    sound = ObjectProperty(None)

    def on_touch_up(self, touch):
        if touch.grab_current == self:
            # call super method and save its return
            ret_val = super(MySlider, self).on_touch_up(touch)

            # adjust position of sound
            self.sound.seek(self.max * self.value_normalized)

            # if sound is stopped, restart it
            if self.sound.state == 'stop':
                MDApp.get_running_app().start_play()

            # return the saved return value
            return ret_val
        else:
            return super(MySlider, self).on_touch_up(touch)


class MusicApp(MDApp):

    def build(self):
        self.a = SoundLoader.load('test.mp3')

        # create slider and pass the sound to it
        self.slider = MySlider(min=0, max=self.a.length, value=0, sound=self.a,
                          pos_hint={'center_x': 0.50, 'center_y': 0.6},
                          size_hint=(0.6, 0.1))

        screen = Screen()

        screen.add_widget(self.slider)

        self.updater = None

        # start the sound
        self.start_play()

        return screen

    def start_play(self, *args):
        # play the sound
        self.a.play()

        if self.updater is None:
            # schedule updates to the slider
            self.updater = Clock.schedule_interval(self.update_slider, 0.5)

    def update_slider(self, dt):
        # update slider
        self.slider.value = self.a.get_pos()

        # if the sound has finished, stop the updating
        if self.a.state == 'stop':
            self.updater.cancel()
            self.updater = None


MusicApp().run()

MySlider类扩展MDSlider并重写其on_touch_up()方法以调整声音位置。它也由计划的update_slider()方法更新。

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