unit_converter | An easy to use PHP unit conversion library | Analytics library

I am currently learning flutter development through doing an Udacity tutorial. While testing my app after adding new assets to it, a strange black screen with a never ending blue loading circle shows up.

Here a screenshot:

When does this screen appear? Or why? Any ideas of how I can make this go away?

I have tried resetting the android emulator and removing updates to the code.

I have the code on GitHub: https://github.com/jonasxd360/hello_rectange/tree/cff4177593fadd3d21cd28a3b6eb4987d89581af

Thanks for your help!

Update:

I was able to solve the issue, but I am not sure why it came up.

This is the file that caused the issue:

i am trying to pass data from my flutter app to other apps. The purpose is to send the download link for my app to another app(say watsapp,facebook,twitter etc.). I am using flutter plugin share 0.6.0+1. i added the package as instructed. But when i ran the program, the following error was displayed:

[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: MissingPluginException(No implementation found for method share on channel plugins.flutter.io/share) E/flutter ( 8153): #0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:300:7) E/flutter ( 8153): E/flutter ( 8153): #1 Share.share (package:share/share.dart:44:20) E/flutter ( 8153): #2 _MyHomePageState.build. (package:unit_converter/main.dart:409:34) E/flutter ( 8153): #3 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:513:14) E/flutter ( 8153): #4 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:568:30) E/flutter ( 8153): #5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:120:24) E/flutter ( 8153): #6 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9) E/flutter ( 8153): #7 TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:204:7) E/flutter ( 8153): #8 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27) E/flutter ( 8153): #9 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:218:20) E/flutter ( 8153): #10 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:192:22) E/flutter ( 8153): #11 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:149:7) E/flutter ( 8153): #12 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:101:7) E/flutter ( 8153): #13 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:85:7) E/flutter ( 8153): #14 _rootRunUnary (dart:async/zone.dart:1136:13) E/flutter ( 8153): #15 _CustomZone.runUnary (dart:async/zone.dart:1029:19) E/flutter ( 8153): #16 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7) E/flutter ( 8153): #17 _invoke1 (dart:ui/hooks.dart:223:10) E/flutter ( 8153): #18 _dispatchPointerDataPacket (dart:ui/hooks.dart:144:5)

The following is the content of my pubspec.yaml file:

I am trying to follow along with the Flutter udacity course and in this portion of the code, I need to create a custom widget with a transparent background but instead it is showing a white background. The parent background is set to a slightly transparent green and i am using Scaffold in the parent widget. How do I get the background of my custom Category Widget transparent?

main.dart

I have a CSV file that has the following headers :