【发布时间】：2018-11-13 15:21:12
【问题描述】：
我是 python 和 kivy 编程的新手，为了了解更多信息，我尝试制作一个小型音乐播放器 - 如果我从窗格旁边的 balk 列表中选择，它会播放声音 - 但我无法理解窗格本身可以工作 - 我需要一些解释如何实现这一点，而类似的主题并不是很有帮助。我试图让握把布局中的 4 个按钮正常工作 - 但没有任何效果。这是我在 python\kivy 中的代码：
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()
还有.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
这是我的第一个问题，所以请大家理解我还没有经验
【问题讨论】：
-
不确定你在问什么。我看到您在
GridLayout中定义了 4 个按钮，但只为其中一个分配了on_press操作。所以没有定义任何动作的三个将有no effect。请清楚您的问题是什么。 -
我知道必须在每个按钮上使用 on_press 但我的问题是如何为它们编写正确的功能 - 我的按钮如下前一首歌，暂停，播放和下一首歌曲 - 我在想我自己怎么做，但我每次尝试都失败了
-
因此，您首先在
Player中为每个按钮编写一个方法。使用documentation 寻求帮助。例如，pause方法可能会从Sound调用stop()方法，如果您希望play从暂停点继续，则可能会调用get_pos()方法，previous和next方法是只需停止任何当前播放的声音并在下一首或上一首曲目上调用SoundLoader。您可能需要将您的tracks列表作为实例变量，而不是load_tracks的本地变量。 -
谢谢约翰，我会立即在我的代码中尝试你的提示 - 我没有考虑这些方法，我试图将函数直接写入“load_tracks” - 我现在看到了我的错误。感谢您的宝贵时间，周末愉快。完成后我会通知你。
标签： python function button kivy