Kivy按鈕實現-如何用我的書面代碼做到這一點？

Question

我是python和kivy編程的新手，要了解更多信息，我嘗試制作一個小型音樂播放器-如果我從窗格旁邊的列表列表中進行選擇，它將播放聲音-但我無法將該窗格本身工作-我需要一些解釋說明如何實現這一目標，而類似主題並不是很有幫助。 我試圖在握點布局中使4個按鈕正常工作-但沒有任何效果。這是我在python \\ kivy中的代碼：

import kivy
kivy.require('1.10.0')
from kivy.config import Config
Config.set('graphics', 'fullscreen', '0')

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.core.audio import SoundLoader
from kivy.uix.gridlayout import GridLayout
from kivy.properties import ObjectProperty
from kivy.uix.floatlayout import FloatLayout
from os import listdir, path

Builder.load_file("views/theme.kv")

class Player(Widget):
    directory = "" #directory path;
    currentlyplaying = "" #now playing song;

    def Gettrack_path(self):
        try:
            track = open("path/path.dat", "r")
            self.ids.direct.text = str(track.readline())
            track.close()
            self.ids.searchBtn.text = "Search"
            self.load_tracks()
        except:
           self.ids.direct.text = ''

    def Savetrack_path(self, path):
        track = open("path/path.dat", "w")
        track.write(path)
        track.close()

    def select(self, path):
        self.directory = path
        self.ids.direct.text - self.directory
        self.ids.searchBtn.text = "Search tracks"
        self.Savetrack_path(self.directory)
        self.load_tracks()

    def load_tracks(self):
        tracks = []
        self.directory = self.ids.direct.text
        if not self.directory.endswith("/"):
            self.directory += "/"

        if not path.exists(self.directory):
            self.ids.status.text = "Given path doesn't exist"
            self.ids.status.color = (1,0,0,1)
        else:
            self.ids.status.text = ""
            self.ids.scroll.bind(minimum_height = self.ids.scroll.setter("height"))

        for file in listdir(self.directory):
            if file.endswith(".mp3") or file.endswith(".wav") or file.endswith(".aiff") or file.endswith(".aac") or file.endswith(".ogg") or file.endswith(".mp4") or file.endswith(".wma"):
                tracks.append(file)
        if tracks == [] and self.directory != "":
            self.ids.status.text = "No tracks found"
            self.ids.status.color = (1,0,0,1)
        if self.directory == "/" or self.directory == "":
            try:
                self.ids.status.text = "No tracks found - given path doesn't exist"
                self.ids.status.color = (1,0,0,1)
            except:
                self.ids.status.text ="Error loading path"
                self.ids.status.color = (1,0,0,1)
                self.directory = "/"
        tracks.sort()

        for track in tracks:
            def playTrack(bt):
                try:
                    self.currentlyplaying.stop()
                except:
                    pass
                finally:
                    if track.endswith(".mp3"): 
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.mp3')
                        self.currentlyplaying.play()
                        self.ids.nowplay.text = bt.text
                    if track.endswith(".wav"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.wav')
                        self.currentlyplaying.play()
                        self.ids.nowplay.text = bt.text
                    if track.endswith(".aiff"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.aiff')
                        self.currentlyplaying.play()
                        self.ids.nowplay.text = bt.text
                    if track.endswith(".aac"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.aac')
                        self.currentlyplaying.play()
                        self.ids.nowplay.text = bt.text
                    if track.endswith(".ogg"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.ogg')
                        self.currentlyplaying.play()
                        self.ids.nowplay.text = bt.text
                    if track.endswith(".mp4"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.mp4')
                        self.currentlyplaying.play()
                        self.ids.nowplay.text = bt.text
                    if track.endswith(".wma"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.wma')
                        self.currentlyplaying.play()
                        self.ids.nowplay.text = bt.text

            btn = Button(text = track[:-4], on_press = playTrack)
            self.ids.scroll.add_widget(btn)
            if tracks.index(track) % 2 == 0:
                btn.background_color = (88, 44, 234, 0.6)
            else:
                btn.background_color = (37, 44, 249, 0.6)
            self.soundplayer(*tracks)
        def soundplayer(sound):
            if self.ids.play.state == "down":
                playsound = SoundLoader.load(sound)
                playsound.play()



class PyPlayer(App):
    def build(self):
        player = Player()
        player.Gettrack_path()
        return player   
PyPlayer().run()

而且有.kv文件

    #:kivy 1.10
<Player>:

    canvas.before:
        Color:
            rgba: 0,0,0,1
        Rectangle:
            pos: self.pos
            size: self.size

    TextInput:
        id: direct
        pos: 0,root.top-35
        size: (root.width * 0.3),35
        hint_text: 'Browse'

    Button:
        id: searchBtn
        size: (root.width * 0.1),36
        background_color: 1, 0, 0, 22
        pos: root.width * 0.3, root.top-35
        on_release: root.load_tracks()

    ScrollView:
        size_hint: None, None
        size: (root.width *0.4), root.height - 45
        pos: 0, 0
        GridLayout:
            id: scroll
            cols: 1
            spacing: 10
            size_hint_y: None
            row_force_default: True
            row_default_height: 40

    GridLayout:
        rows: 1
        pos: (root.width * 0.4), root.height - 135
        size: (root.width * 0.6), 50
        Button:
            id:previous
            background_color: 0, 0, 0, 1
            Image:
                source: "backward.png"  
                y: self.parent.y + self.parent.height - 75
                x: self.parent.x + 10
                size: self.size
        Button:
            id:pause
            background_color: 0, 0, 0, 1
            Image:
                source: "pause.png"
                y: self.parent.y + self.parent.height - 75
                x: self.parent.x + 10
                size: self.size
        Button:
            id:play
            on_press: root.soundplayer()
            background_color: 0, 0, 0, 1
            Image:
                source: "play.png"
                y: self.parent.y + self.parent.height - 75
                x: self.parent.x + 10
                size: self.size

        Button:
            id:forward
            background_color: 0, 0, 0, 1

            Image:
                source: "forward.png"
                y: self.parent.y + self.parent.height - 75
                x: self.parent.x + 10
                size: self.size
    Button:
        id: nowplay
        text: 'Currently Playing'
        pos: (root.width * 0.4),root.height - 85
        size: (root.width * 0.6), 50
        background_color: 0, 0, 0, 0

    Label:
        id: status
        text: ''
        pos: root.width * 0.15, root.top * 0.5

這是我的第一個問題，所以請大家明白我還沒有經驗

Answer 1

花費了很長時間，但我忘了發布代碼-也許有人會在自己的項目中學習或重用我的答案：

import kivy
kivy.require('1.10.0')
from kivy.config import Config
Config.set('graphics', 'fullscreen', '0')

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.core.audio import SoundLoader
from kivy.uix.gridlayout import GridLayout
from kivy.properties import ObjectProperty
from kivy.properties import NumericProperty
from kivy.uix.slider import Slider
from os import listdir, path

Builder.load_file("views/theme.kv")

class Player(Widget):
    directory = "" #directory path;
    currentlyplaying = "" #now playing song;
    position = 0
    volume = 0
    maxvolume = NumericProperty(1.0)
    tracks = []
    def Gettrack_path(self):
        try:
            track = open("path/path.dat", "r")
            self.ids.direct.text = str(track.readline())
            track.close()
            self.ids.searchBtn.text = "Search"
            self.load_tracks()
        except:
           self.ids.direct.text = ''

    def Savetrack_path(self, path):
        track = open("path/path.dat", "w")
        track.write(path)
        track.close()

    def load_tracks(self):
        self.directory = self.ids.direct.text
        if not self.directory.endswith("\\"):
            self.directory += "\\"

        if not path.exists(self.directory):
            self.ids.status.text = "Given path doesn't exist"
            self.ids.status.color = (1,0,0,1)
        else:
            self.ids.status.text = ""
            self.ids.scroll.bind(minimum_height = self.ids.scroll.setter("height"))

        for file in listdir(self.directory):
            if file.endswith(".mp3") or file.endswith(".wav") or file.endswith(".aiff") or file.endswith(".aac") or file.endswith(".ogg") or file.endswith(".mp4") or file.endswith(".wma"):
                self.tracks.append(file)
        if self.tracks == [] and self.directory != "":
            self.ids.status.text = "No tracks found"
            self.ids.status.color = (1,0,0,1)
        if self.directory == "\\" or self.directory == "":
            try:
                self.ids.status.text = "No tracks found - given path doesn't exist"
                self.ids.status.color = (1,0,0,1)
            except:
                self.ids.status.text ="Error loading path"
                self.ids.status.color = (1,0,0,1)
                self.directory = "\\"
        self.tracks.sort()
        for track in self.tracks:
            def playTrack(bt):
                try:
                    self.currentlyplaying.stop()
                except:
                    pass
                finally:
                    if track.endswith(".mp3"): 
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.mp3')
                        self.currentlyplaying.play()
                        self.currentlyplaying.volume = self.volume
                        self.ids.nowplay.text = bt.text+'.mp3'
                    if track.endswith(".wav"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.wav')
                        self.currentlyplaying.play()
                        self.currentlyplaying.volume = self.volume
                        self.ids.nowplay.text = bt.text+'.wav'
                    if track.endswith(".aiff"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.aiff')
                        self.currentlyplaying.play()
                        self.currentlyplaying.volume = self.volume
                        self.ids.nowplay.text = bt.text+'.aiff'
                    if track.endswith(".aac"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.aac')
                        self.currentlyplaying.play()
                        self.currentlyplaying.volume = self.volume
                        self.ids.nowplay.text = bt.text+'.aac'
                    if track.endswith(".ogg"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.ogg')
                        self.currentlyplaying.play()
                        self.currentlyplaying.volume = self.volume
                        self.ids.nowplay.text = bt.text+'.ogg'
                    if track.endswith(".mp4"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.mp4')
                        self.currentlyplaying.play()
                        self.currentlyplaying.volume = self.volume
                        self.ids.nowplay.text = bt.text+'.mp4'
                    if track.endswith(".wma"):
                        self.currentlyplaying = SoundLoader.load(self.directory+bt.text+'.wma')
                        self.currentlyplaying.play()
                        self.currentlyplaying.volume = self.volume
                        self.ids.nowplay.text = bt.text+'.wma'

            btn = Button(text = track[:-4], on_press = playTrack)
            self.ids.scroll.add_widget(btn)
            if self.tracks.index(track) % 2 == 0:
                btn.background_color = (88, 44, 234, 0.6)
            else:
                btn.background_color = (37, 44, 249, 0.6)
    def pause(self):
        if self.ids.pause.state == "down":
            if self.currentlyplaying == "":
                pass
            else:
                self.position = self.currentlyplaying.get_pos()
                self.currentlyplaying.stop()
    def play(self):
        if self.ids.play.state == "down":
            if self.currentlyplaying == "":
                pass
            if self.currentlyplaying.state == "stop":
                self.currentlyplaying.play()
                self.currentlyplaying.volume = self.volume
                self.currentlyplaying.seek(self.position - 1)
            if self.currentlyplaying.state =="play":
                pass
    def next(self):
        if self.ids.forward.state == "down":
            if self.currentlyplaying == "":
                pass
            i = 0
            while(i < len(self.tracks)):
                if self.currentlyplaying.filename == self.directory + self.tracks[i]:
                    self.currentlyplaying.stop()
                    self.currentlyplaying = SoundLoader.load(self.directory + self.tracks[i+1])
                    self.ids.nowplay.text = self.tracks[i+1]
                    self.currentlyplaying.play()
                    self.currentlyplaying.volume = self.volume
                    break
                elif self.currentlyplaying.filename == self.directory + self.tracks[-1]:
                    self.currentlyplaying.stop()
                    self.currentlyplaying = SoundLoader.load(self.directory + self.tracks[0])
                    self.ids.nowplay.text = self.tracks[0]
                    self.currentlyplaying.play()
                    self.currentlyplaying.volume = self.volume
                    break
                i += 1
    def previous(self):
        if self.ids.previous.state == "down":
            if self.currentlyplaying == "":
                pass
            i = 0
        while(i < len(self.tracks)):
                if self.currentlyplaying.filename == self.directory + self.tracks[i]:
                    self.currentlyplaying.stop()
                    self.currentlyplaying = SoundLoader.load(self.directory + self.tracks[i-1])
                    self.ids.nowplay.text = self.tracks[i-1]
                    self.currentlyplaying.play()
                    self.currentlyplaying.volume = self.volume
                    break
                elif self.currentlyplaying.filename == self.directory + self.tracks[0]:
                    self.currentlyplaying.stop()
                    self.currentlyplaying = SoundLoader.load(self.directory + self.tracks[-1])
                    self.ids.nowplay.text = self.tracks[-1]
                    self.currentlyplaying.play()
                    self.currentlyplaying.volume = self.volume
                    break
                i += 1

    def volumectrl(self, *args):
        self.volume = int(args[1]) / 100
        if self.volume >= int(self.maxvolume):
            self.volume = int(self.maxvolume)
        self.currentlyplaying.volume = self.volume


class PyPlayer(App):
    def build(self):
        player = Player()
        player.Gettrack_path()
        return player   
PyPlayer().run()

當然還有一個.kv文件：

#:kivy 1.10
<Player>:
    orientation: "horizontal"
    canvas.before:
        Rectangle:
            pos: self.pos
            size: self.size
            source: "264727.jpg"


    TextInput:
        id: direct
        pos: 0,root.top-35
        size: (root.width * 0.3),35
        hint_text: 'balk is empty'

    Button:
        id: searchBtn
        size: (root.width * 0.1),36
        background_color: 1, 0, 0, 22
        pos: root.width * 0.3, root.top-35
        on_release: root.load_tracks()

    ScrollView:
        size_hint: None, None
        size: (root.width *0.4), root.height - 45
        pos: 0, 0
        GridLayout:
            id: scroll
            cols: 1
            spacing: 10
            size_hint_y: None
            row_force_default: True
            row_default_height: 40

    GridLayout:
        rows: 1
        pos: (root.width * 0.4), root.height - 135
        size: (root.width * 0.6), 50
        Button:
            id:previous
            background_color: 0, 0, 0, 0
            on_press: root.previous()
            Image:
                source: "backward.png"  
                y: self.parent.y + self.parent.height - 75
                x: self.parent.x + 10
                size: self.size
        Button:
            id:pause
            on_press: root.pause()
            background_color: 0, 0, 0, 0
            Image:
                source: "pause.png"
                y: self.parent.y + self.parent.height - 75
                x: self.parent.x + 10
                size: self.size
        Button:
            id:play
            on_press: root.play()
            background_color: 0, 0, 0, 0
            Image:
                source: "play.png"
                y: self.parent.y + self.parent.height - 75
                x: self.parent.x + 10
                size: self.size

        Button:
            on_press: root.next()  
            id:forward
            background_color: 0, 0, 0, 0
            Image:
                source: "forward.png"
                y: self.parent.y + self.parent.height - 75
                x: self.parent.x + 10
                size: self.size
    Slider:
        id:volumecontrol
        size_hint_y: 0.1
        pos: (root.width * 0.4), root.height - 200
        size: (root.width * 0.6) - 15, 50
        max: 100
        min: 0
        on_value:root.volumectrl(*args)

    Button:
        id: nowplay
        text: 'Currently Playing'
        pos: (root.width * 0.4),root.height - 85
        size: (root.width * 0.6), 50
        background_color: 0, 0, 0, 0

    Label:
        id: status
        text: ''
        pos: root.width * 0.15, root.top * 0.5

我做了什么更改-首先，我將曲目列表替換為head類-這樣就可以使用所有功能，並可以將功能寫入小界面中的所有按鈕-我在kv文件中使用了指向背景的鏈接image是什么使它更漂亮，並且作為獎勵，我編寫了一個音量控制功能，並創建了一個條形圖，使其可以不斷讀取該值，無論該值在0到100之間