Cant Connect

Question

我在kivy中创建了一个应用程序，使用pymysql模块创建了一个简单的登录系统。python文件在我的桌面上运行时没有任何错误，但是当我在我的Nexus平板电脑上运行这个应用程序时，它会崩溃并抛出随后的错误。

有人能找出这个问题的原因并指出正确的方向吗？谢谢。

06-07 12:07:35.319 10766 10786 I python  :  Traceback (most recent call     last):
06-07 12:07:35.342 10766 10786 I python  :    File "/home/andrew/Desktop/Python/Kivy/1-application/.buildozer/android/app/main.py", line 83, in <module>
06-07 12:07:35.343 10766 10786 I python  :    File "/home/andrew/Desktop/Python/Kivy/1-application/.buildozer/android/platform/build/dists/myapp/private/lib/python2.7/site-packages/pymysql/__init__.py", line 90, in Connect
06-07 12:07:35.344 10766 10786 I python  :    File "/home/andrew/Desktop/Python/Kivy/1-application/.buildozer/android/platform/build/dists/myapp/private/lib/python2.7/site-packages/pymysql/connections.py", line 706, in __init__
06-07 12:07:35.345 10766 10786 I python  :    File "/home/andrew/Desktop/Python/Kivy/1-application/.buildozer/android/platform/build/dists/myapp/private/lib/python2.7/site-packages/pymysql/connections.py", line 963, in connect
06-07 12:07:35.346 10766 10786 I python  :  pymysql.err.OperationalError: (2003, "Can't connect to MySQL server on '<IP ADDRESS>' ([Errno 13] Permission denied)")
06-07 12:07:35.402 10766 10786 I python  : Python for android ended.

编辑:我进入了buildozer.spec文件，取消了访问互联网的权限，现在我得到了一个超时错误。

pymysql.err.OperationalError: (2003, "Can't connect to MySQL server on '<IP ADDRESS>' (timed out)")

这是我试图连接到我的数据库的一个例子.

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
import pymysql.cursors

class LoginScreen(GridLayout):
    #CONTENT HERE

class SimpleKivy(App):
    def build(self):
        return LoginScreen()

if __name__ == "__main__":
    #Error Happens Here
    connection = pymysql.connect(host="<IP ADDRESS>", user="usr", password="pswd", db="slogin")

    SimpleKivy().run()

Answer 1

已修复。防火墙阻止了对MYSQL服务器的访问，并且毫无例外地错误处理导致应用程序崩溃。