Create an AlertDialog in a fragment using Kotlin

Question

In my Android app, I have an observer and in the callback I want to display an AlertDialog. The Builder method however needs a context. I need to obtain the context of the activity that the fragment is in but am not sure how to get it:

viewModel.onError.observe(this, Observer {
    val mAlertDialog = AlertDialog.Builder(activity) // This needs the activity's context
    mAlertDialog.setMessage(it.toString())
    mAlertDialog.show()
})

Answer 1

You should pass activity!! for Fragment.

val dialogBuilder = AlertDialog.Builder(activity!!)
        dialogBuilder.setMessage(it.toString())
                // if the dialog is cancelable
                .setCancelable(false)
                .setPositiveButton("Ok", DialogInterface.OnClickListener {
                    dialog, id ->
                    dialog.dismiss()

                })

        val alert = dialogBuilder.create()
        alert.setTitle("Test")
        alert.show()