How do I turn off the back button in Flutter?

Answer: To disable the back button in Flutter, you can use a custom WillPopScope widget. Wrap your material app in this widget, preventing the user from using the back button. You can also override the method to have your custom action when the back button is pressed.

In Flutter, you can disable the back button by intercepting the back button press event and preventing the default behavior.

One way to do this is to use the WillPopScope widget. You can wrap the entire body of your app with a WillPopScope widget and provide an onWillPop callback function that returns a Future. The onWillPop function is called when the back button is pressed. You can prevent the back button from closing the app by returning the Future.value(false) from this function.

Here’s an example of how you can use the WillPopScope widget to disable the back button:

In this example, the onWillPop callback is set to return false, which will prevent the user from leaving the current screen. If you want to show an alert or any other custom UI before disabling the back button you can use showDialog to show an alert Dialog, or any other custom UI you want.

In this example, the onWillPop callback shows an alert dialog asking the user if they want to leave the current screen. If the user taps “Yes,” the callback returns true, allowing the user to leave the screen. If the user taps “No,” the callback returns false, preventing the user from leaving the screen.