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I'm newbie in python and kivy programming and to learn a bit more I've tried to make a small music player - it plays sound if I choose from balk list next to the pane - but I can't get that pane itself to work - I need some explanation how to achieve that and the similair subjects aren't very helpful. I've tried to get exactly 4 buttons in grip layout to work - but without any effect.Here is my code in pythonkivy:

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()

And there is .kv file

 #: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

It's my first question here so please guys understand that I don't have experience yet

That took not so long but I forgot to post my code - maybe somebody will learn or reuse my answer in own project:

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()

And of course a .kv file:

#: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

What have I changed - at first I replace a list of my tracks to head class - that makes it available for all functions and make possible to write functions to all buttons in my small interface - I've used in kv file a link to background image what makes it a bit prettier, and as bonus I've written a volume control function and I've created a bar for it to read constantly the value whatever it is in range from 0 to 100