flutter CircularProgressIndicator

The CircularProgressIndicator widget in Flutter is used to display a circular progress indicator, typically to indicate that a task is in progress. It is commonly used in scenarios such as loading data from a network or performing a time-consuming operation.

To use the CircularProgressIndicator widget in Flutter, you can simply create an instance of it and place it in your widget tree. Here's an example:


This will display a default circular progress indicator with the default size and colors. You can customize the appearance of the CircularProgressIndicator by using its various properties. For example, you can change the size, color, and stroke width of the indicator. Here's an example that demonstrates some of the available properties:

  backgroundColor: Colors.grey, // Sets the background color of the indicator
  valueColor: AlwaysStoppedAnimation<Color>(Colors.blue), // Sets the color of the indicator
  strokeWidth: 5.0, // Sets the width of the indicator's stroke

In this example, the backgroundColor property is set to Colors.grey, the valueColor property is set to AlwaysStoppedAnimation<Color>(Colors.blue), and the strokeWidth property is set to 5.0.

You can also control the progress of the indicator by using the value property. The value property accepts a double value between 0.0 and 1.0, where 0.0 represents no progress and 1.0 represents complete progress. By updating the value property over time, you can animate the progress indicator. Here's an example:

double progress = 0.5; // Initial progress value

  value: progress, // Sets the progress value of the indicator

In this example, the value property is set to progress, which is initially set to 0.5. As the progress value changes, the indicator will animate accordingly.

That's a brief overview of the CircularProgressIndicator widget in Flutter. I hope this helps!