How to forbid user to close alert dialog touching outside it?

Question

I have this dialog fragment class:

class AskDownloadFragment : DialogFragment() {
private lateinit var navController: NavController
private lateinit var mainActivity: MainActivity

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {

    mainActivity = activity as MainActivity

    return activity.let {
        // Use the Builder class for convenient dialog construction
        AlertDialog.Builder(it).setMessage(R.string.want_to_download)
            .setNegativeButton(R.string.no) { _, _ ->
                dismiss()
            }

            .setPositiveButton(R.string.yes) { _, _ ->
                dismiss()
                mainActivity.showDownloadDialog()
            }
            .setCancelable(false)

            // Create the AlertDialog object and return it
            .create()
    }
}

}
And I cal it this way:

AskDownloadFragment().show(supportFragmentManager, DialogTags.TAG_ASK_DOWNLOAD.toString())

I can see the dialog on the screen, but I'm still able to close it touching outside alertDialog. What can I do?

Answer 1

Just simply use this key

.setCanceledOnTouchOutside(false)

So overall it will be like

class AskDownloadFragment : DialogFragment() {
private lateinit var navController: NavController
private lateinit var mainActivity: MainActivity

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {

    mainActivity = activity as MainActivity

    return activity.let {
            // Use the Builder class for convenient dialog construction
            val dialog = AlertDialog.Builder(it).setMessage(R.string.want_to_download)
                    .setNegativeButton(R.string.no) { _, _ ->
                        dismiss()
                    }

                    .setPositiveButton(R.string.yes) { _, _ ->
                        dismiss()
                        mainActivity.showDownloadDialog()
                    }
                    .setCancelable(false)
                   

                    // Create the AlertDialog object and return it
                    .create()
            dialog.setCanceledOnTouchOutside(false)
            dialog
        }
}