Intercepting the back button

user_421372 0
Viewed 18283

I'm writing an application which will have two Activities, when the user presses the back button on the second activity a dialog should pop up asking the user to confirm the action. So how do I intercept this? I seriously doubt about this coz the backstack is a part of the OS itself. Has anyone found a workaround?

function android
4 Answers

By the docs, do not use onBackPressed if you can. Now is recommended using onBackPressedDispatcher.addCallback(this) {}. There's a Fragment example:

class MyFragment : Fragment() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // This callback will only be called when MyFragment is at least Started.
        val callback = requireActivity().onBackPressedDispatcher.addCallback(this) {
            // Handle the back button event
        }

        // The callback can be enabled or disabled here or in the lambda
    }
    ...
}
user_43676830
Related