Alertdialog Listener Not Attached

MyAlertDialog throws ClassCastException when trying to set the context to the listener. I'm calling the MyAlertDailog from a fragment. I'm using the guide found in the android dev

Solution 1:

Even though the launchAlertDialog() method is inside of MyFragment, the "host" for MyAlertDialog is your Activity, not MyFragment.

Implement MyAlerDialog.MyAlertDialogListener inside of MainActivity in order for the cast to succeed. MainActivity can then communicate to MyFragment if it has to.

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Alternatively, you could use setTargetFragment() in order to "connect" MyFragment and MyAlertDialog directly:

val dialog = MyAlertDialog()
dialog.setTargetFragment(this, 0)
dialog.show(requireActivity().supportFragmentManager, "DialogInfoFragment")

Then, rather than overriding onAttach() and casting a context, you would cast the results of getTargetFragment():

builder.setPosiviveButton(
        "Positive button",
        DialogInterface.OnClickListener {
            val listener = targetFragment as MyAlertDialogListener
            listener.onDialogPositiveClick(this)     
        }
)