Flutter Rows & Columns

Widgets play a key role in flutter layout where everything is a widget. Text and images are widgets but something you don’t see in a Flutter app is also widgets e.g, rows and columns, etc. Text and images are visible widgets whereas rows and columns are layout or invisible widgets. Row Widget will have its […]

Flutter Container Widget

Do you have a widget that needs some background style, maybe a background color shape or some size constraints? Try wrapping it in a Container Widget. It helps you compose, decorate and position child widgets. Color If you wrap your widget in a container widget without any other parameters, you won’t notice any difference in […]

Flutter Display Widgets Conditionally

Our application have a bug, it crashes when all questions are answered. Instead of crashing the app, it would be nice if we display some message when the questions list is exhausted. Here, I’ll output a different widget once all questions are answered.

Flutter Maps

We need to improve the functionality of our app. Currently we have a list of just two questions and no answer is associated with the question. The question should also have the information about available answers. We need more complex object which can group multiple pieces of information together. We could create a new class […]

Flutter Button Formatting and Passing Call back Function

We had already created a new widget for questions. Now, we’ll create a new widget for answers. Create a new file answer.dart besides main.dart and add the following code there. Here is question.dart file previously created. In our main.dart file we’ll add the import for answer.dart and will replace ElevatedButton() code with this Answer() code […]

Flutter Widget Formatting

| flutter Flutter Widget Formatting widget formatting

Flutter Create a New Custom Widget

| custom widget Flutter Create a New Custom Widget flutter custom widget flutter widget

Flutter Private Properties

Unlike Java, Dart doesn’t have the keywords public, protected, and private. If an identifier starts with an underscore _, it’s private to its library. Libraries not only provide APIs, but are a unit of privacy: identifiers that start with an underscore _ are visible only inside the library. Every Dart app is a library, even if it […]

Flutter Need for StatefulWidget

Continuing from our last blog post “Flutter/Dart Anonymous Function” , in this post we have added a list of questions in build() for now, with only two questions. We have introduced a variable ‘questionIndex’ to keep track and change the question on the go. We increment this variable questionIndex in answerQuestion() function in MyApp class. […]

Flutter/Dart Anonymous Function

Anonymous function is called anonymous because it has no name. Anonymous function is always a good idea if you never need to call it from anywhere else, it has no name and you can’t call it from anywhere else. Output Happy Coding!

Flutter Functions on Button Click

Added: In the previous post “Flutter Column Layout Widget” we created a Column() layout widget that took ‘children’ argument which was a list of Widgets, one Text() widget and three ElevatedButton() widgets. ElevatedButton() widget took two arguments. child which takes a Text() widget i.e, text of the button. onPressed which we passed null at that […]

Dart Named Arguments

There are two types of arguments for a constructor in dart. Positional arguments – These are commonly used. For Positional arguments you have to remember which argument goes in to which place. Named arguments – This is a new concept if you belong to C++, Java or PHP. For Named Arguments you don’t need to […]

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Dart Constructor

In this constructor we are using positional arguments i.e, inputName and inputAge instead of named arguments.