What want to do I want to create an input form using TextField. For example, if the input content is a monetary amount, I would like to...

What want to do There is a variable that remain unchanged once the initial value is determined. However, it cannot be determined yet when...

What want to do As the title suggests. Place two widgets in one line on the screen One in the center of the screen and the other on the...

Phenomenon Certain icons perform certain actions when long-pressed To achieve this, I registered the actions in GestureDetector's...

Background Consider the following case. There is a list of items There is a page that displays details for a specific item. You can...

Issue Assumptions Register and save multiple items Items are managed with a unique id State management is redux The flow of adding a new...

Things to do Use Redux for state management. Let the state be AppState. Start acquiring data from remote database when app starts Get...

Things to do There is a widget that displays an image Images are acquired from remote storage Because it takes time, I would like to...

What want to do Characters A list of some items (hereafter ListView) Some Widget (hereafter text) Layout Text is fixed at the bottom of...

Problem There are times when you want to do asynchronous process in the constructor of a Dart class. For example, the initial value is...

Phenomenon When I try to sign in to Firebase with google_sign_in, it fails with the following error. Unhandled Exception:...

Phenomenon When hot restart the Flutter runApp(MyApp()); runs twice (checked with debugger). It seems this issue is only for Hot Restart....

Phenomenon When I try to build with Flutter I get the following error Method 'addPostFrameCallback' cannot be called on 'WidgetsBinding?'...

Phenomenon When Admob is added in the app and the app is started, the following error occurs. java.lang.RuntimeException: Unable to get...

Overview When I have a Uri and want to convert it to a Url, I'm a little confused, so I'll share. Method String url = uri.toString();...

Overview In dart, you can add the factory keyword to the constructor. I made the following mistake. A factory constructor is for creating...

Oveview There is a generic StatefulWidget like below. class childWidget extends StatefulWidget{ State<StatefulWidget> createState() {...

Overview When creating an instance of a certain class, there are cases where it is optional to set arguments to the instance, and if not...

Overview Suppose adding a class variable in dart like below. Private (don't want to be accessed from outside) Determine the value by...

Phenomenon Create a notification using flutter_local_notification. The method when tapping the notification is also registered. If the...