Flutter - Quiz application by using Radio and Checkbox

In the mobile application, if you creating a feature that providing multiple options like user registration form screen where we always ask gender and hobby of the user. So, in that case, we always need a radio and checkbox widget in the application.

A Radio button used in the radio group that provides more than one radio button. The user can choose only one option at a time. A radio button has two states which are either checked or unchecked. Once a radio button is checked, it cannot be marked as unchecked by the user.

The check box is a different type of two-state button that either checked or unchecked. It is generally used in a place where user can select more than one choices from a given list of options. For example: hobby of the user or activate/deactivate the specific state.

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Flutter - Sticky header list

To divide the category of the items in the list view, we always need a sticky header. The sticky header shows header of group at the top of the list view when the user scrolls through the contents. The sticky header makes groups of children of the same type and also gives great UI.

The headers display at the top of the list content and help your application users keep track of which section they are currently in. The header may be one or more, it depends upon the type of the children items of the list view. If there is more than one header than the header will be replaced by another header when the user scrolls up all the items of the old header. 

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Flutter - Upload multipart images on server.

Sometimes, we have to upload an image on the server to complete application features like feed and user profile pic. The multipart is a simple option to upload images in the multipart request.

The Dio library also gives an option to send the multipart HTTP requests. You must use Dio
library to upload multiple file if creating a big application. The Dio client is a powerful Http client for Dart or Flutter application which supports Interceptors, Request Cancellation, Form Data, File downloading, Global configuration, Connection Timeout, etc that is explained here: Flutter - Dio client to create Http Request

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