问应用程序在Python2 & Python3中运行良好，但是接收错误:导入android失败，按钮没有响应

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10-10 17:44:49.497 19176 19207 I python  : [ERROR  ] [Image       ] Error reading file .\logo_example1.png
10-10 17:44:49.498 19176 19207 I python  : [WARNING] [Base        ] Unknown <android> provider
10-10 17:44:49.498 19176 19207 I python  : [INFO   ] [Base        ] Start application main loop
10-10 17:44:49.503 19176 19207 I python  : [INFO   ] [GL          ] NPOT texture support is available
10-10 17:44:49.504 19176 19207 I python  : 0
10-10 17:44:49.504 19176 19207 I python  : coloring
10-10 17:44:49.505 19176 19207 I python  : [ERROR  ] [Base        ] Failed to import "android" module. Could not remove android presplash.

#: import Main main    
<CtmButton@Button>:
    font_size:30
    size:100, 50
<BackButton@Button>:
    font_size:30
    size:100, 50
    text: "Back"
    pos: Main.Wsize[0]+100, Main.Wsize[1]+100
<mainWidget>:
    id: main_widget
<homeWidget>:
    id: home_widget
    padding : 200
    Image:
        id:logo
        source: 'logo_example1.png'
        center: 300, 450
    CtmButton:
        id: start_button
        text: "Start"
        center:300, 200
        on_release: home_widget.startbutton_function()
    ## I also have tried replacing this with on_touch_down
    ## to see whether it will solve the problem
<puzzleWidget>:
    id: puzzle_widget
    BackButton:
        id: back_button_1
        center: 100, 37.5
        on_release: puzzle_widget.backbutton_function()

import kivy
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.label import Label
from kivy.core.window import Window
from kivy.uix.image import Image
from kivy.core.image import ImageData
from kivy.clock import Clock
from kivy.graphics import Rectangle
import time
import math
import itertools
import numpy 
Window.clearcolor = (0.2, 0.25, 0.2, 0.5); col_dx = 0.005; y = list(Window.clearcolor); xstart = 0;
Window.size = (600, 700); Wsize = Window.size;
class mainWidget(Widget):
    def __init__(self):
        Widget.__init__(self);
        home = homeWidget(); self.add_widget(home);
class homeWidget(Widget):
    def __init__(self):
        Widget.__init__(self);
        self.bg_animate();
    def printingsomething(self, dt):
        print(dt);
    def bg_animate(self):
        global bg_anim
        self.bg_anim = Clock.schedule_interval(self.printingsomething,1/40);
        self.bg_anim();
    def startbutton_function(self):
        print('start pressed');
        self.bg_anim.cancel();
        mainw.clear_widgets();
        mainw.add_widget(puzzleWidget());
class puzzleWidget(Widget):
    def __init__(self):
        Widget.__init__(self); 
        self.Bar1 = Image(size = [600, 75], color = list(Window.clearcolor)); self.Bar1.color[-1] = 0.8; self.Bar1.pos = [0, 700 - self.Bar1.size[1]];
        self.Bar2 = Image(size = [600, 75], color = list(Window.clearcolor)); self.Bar2.color[-1] = 0.8; self.Bar2.pos = [0, 0];
        #### ADD WIDGET(S):
        self.add_widget(self.Bar1); self.add_widget(self.Bar2); 
        self.remove_widget(self.ids.back_button_1); self.add_widget(self.ids.back_button_1);
    def backbutton_function(self):
        print('back pressed');
        self.clear_widgets();
        mainw.clear_widgets();
        mainw.add_widget(homeWidget());
################## main window for the app #########################
class mainApp(App):    
    def build(self):
        global mainw
        mainw = mainWidget();
        return mainw
####################################################################
mainApp = mainApp()
mainApp.run();