Overview In many cases, you'll send a message with Firebase Messaging and take some action when the notification is tapped (eg to go to a...

Overview A title error has occurred at FirebaseMessaging.onBackgroundMessage(). Cause and Solution The delegate passed to the argument of...

Overview When you use Firebase Messaging, you'll want to send a test to your device. It took a little time, so I will summarize how to do...

Overview I think that you often arrange images on the screen in a smartphone app. When displaying images uploaded by users or images...

Overview If you're using firebase, you want to separate your development environment from your production environment. In this process in...

Overview A library called image is useful when editing images with flutter. This library uses image data in the type Uint8List when...

Overview We often place gridview in the app, but I wanted to be able to drag and drop them. In that case, use drag_and_drop_gridview....

Phenomenon I get the following error when trying to save data to firestore. Unhandled Exception: 'package:cloud_firestore_platform_interf...

Overview When displaying an image in the app, you may want to round the corners of the original image. So, this time, I will introduce...

Overview If you want to display an image in the app, I will explain how to display the image according to the area to be displayed....

Phenomenon I got a title error after updating flutter to 2.5.1. According to the error log, the cause seems to be charts-flutter. Cause...

Overview If you want to crop an image in a circle with Flutter, I think you use Circle Avator. CircleAvator determines the radius and...

Overview When displaying an image on a smartphone app, I think that the original image is often cropped and displayed. If you want to...

Overview I will explain how to swipe the entire page in your smartphone app. Method When implementing a swipe with GestureDetector, it is...

Overview I tried to execute the created test with flutter test at once, but there are some tests that are not executed (even if I make it...

Overview I want to get only the documents that meet the conditions from the documents saved in the firestore. I made a query using where...

Overview When creating a page with StatefulWidget, I encountered a situation where I want to determine if it was rebuilt from the parent...

Situation As the title says, when I put a DropdownButton inside a Row with flutter, I get an exception of "A RenderFlex overflowed"....

Situation When I try to convert a character string representing the time to DateTime type with parse () method of DateFormat with...

Overview I'm making a smartphone app with flutter. Redux is used for state management. I want to write the data in the shared preference...