Kivy application runtime crash with exceptions on click of buttons

[Aravind R]

It works good in IDE. Application was build successfully. It behaves really weird in runtime. On click of any button causes an runtime exception. I have attached a recording for the reference : video link . p4a is master version as per default in spec file and ran buildozer as non-root user and webview used is Android-for-Python. Please find all necessary files including source code file, apk that got built, buildozer.spec used, buildozer logcat logs, dependency images and lotty file in link. I don't know how to proceed further. I was blocked with this for months. Please help me resolve this issue. Please reply if you need any other information from my side. Any help is appreciated.

[Robert]

Cant read any file in the link.

If you are using KivyMD  https://github.com/Android-for-Python/Android-for-Python-Users#null-pointer-dereference

[Aravind R]

I am not able to find the root cause. Here are my source files. Please support me to trace the root cause.

[Robert]

I don't debug other people's apps, all I ever do is try to point people in what I think is a helpful direction. The rest is up to you.

But I do suggest you read the link I previously shared.

[Aravind R]

Hi Robert,

          I am not asking you to debug.There is no impure package in my code. None of this really applicable in my case as specified in my link.

• A corrupted build try an appclean. This probably it not the issue but if it is you'll save a lot of work. -- I tried this but doesn't help
  

• Pyjnius code that does not take into account the use of two garbage collectors, modify your code. --  I am using this in place but https://github.com/Android-for-Python/Webview-Example
  
          def copyrightNoticeButtonRelease(instance):
              platformName = platform.system()
              copyrightNoticeUrl = "https://sites.google.com/view/copyright-notices/home"
              if platformName in ["Windows", "Linux"]:
                  import webbrowser
                  webbrowser.open(copyrightNoticeUrl)
              else:
                  try:
                      from webview import WebView
                      WebView(copyrightNoticeUrl)
                  except:
                      showDialog(text = "Technical issues in showing the copyright notices")
  I think this pyjnius code doesn't cause any trouble. In fact this part works fine in app build even now.
  

• Plyer or android_permissions calls that do not occur in the 'App functions' block of the Kivy Lifecycle. Modify your code.
  # (list) Permissions
  android.permissions = INTERNET
  I have already set up the permissions as well.
  

• It is also possible that an impure Python package that has no recipe could generate this error; though other error messages or are more likely.
  from kivymd.app import MDApp
  from kivymd.uix.floatlayout import MDFloatLayout
  from kivymd.uix.textfield import MDTextField
  from kivymd.uix.button import MDFillRoundFlatButton
  from kivymd.uix.button import MDIconButton
  from kivymd.uix.dialog import MDDialog
  from kivy.uix.image import Image
  from kivymd.uix.fitimage import FitImage
  from kivymd.uix.button import MDFlatButton
  from kivymd.uix.card import MDCard
  from kivymd.uix.screen import MDScreen
  from kivy.uix.screenmanager import ScreenManager
  from kivy.uix.screenmanager import FadeTransition
  from kivy.uix.scrollview import ScrollView
  import platform
  from kivymd.uix.list import MDList
  from kivymd.uix.list import OneLineIconListItem
  from kivymd.uix.label import MDLabel
  from kivy.core.window import Window
  
  I have only these imported in my app. There is no impure python modules.
  
  Now I am again completely stuck with it. Can you suggest me some other ways ?
  

[Toon to Tech]

Tried with API level : 32 and p4a.branch as develop. But that doesn't help either. Can you tell me any other ways to resolve this ?

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[Robert]

First thing to try read where it says "ALERT" in the link.

[Toon to Tech]

I am using kivymd 1.0.2

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/997086df-8094-4ce7-a620-982aafb91682n%40googlegroups.com.

[Robert]

Your buildozer.spec says this is not the case

# (list) Application requirements
# comma separated e.g. requirements = sqlite3,kivy
requirements = python3,kivy,kivymd,PIL,android,jnius

[Toon to Tech]

Oops I think I looked in the wrong place. Let me try a build with kivymd 1.0.2 and get back here.

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/f2079cb8-8283-4c08-a10c-fa9ec67e4abbn%40googlegroups.com.

[Toon to Tech]

Hi Robert,

      I retried the build with kivymd 1.0.2. It was a successful build. I can use my application completely now. Then this issue was version specific. I hope you guys will take care of it. Thanks a lot for your support :) .

[Robert]

KivyMD is an unrelated project, all the Kivy project can do is post warnings.  :(