Wsrtjtyk

I capture Key Events (from an external keyboard) within my App. I use onKeyDown() method from Activity. In my app I switch between different Fragments. If I am in a normal Fragment then Activity's onKeyDown() is triggered when pressing buttons. But when I use a DialogFragment as a Dialog then pressing the button does not trigger Activity'sonKeyDown()` any more.

Here some sample code:

class MainActivity : AppCompatActivity() {



    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

    }



    fun onClick(view: View) {

// a) Key Event works if adding it via a fragment transaction by my own

//        val fragment = MyDialogFragment.newInstance()

//        val fragmentTransaction = supportFragmentManager.beginTransaction()

//        fragmentTransaction.add(R.id.fr_container, fragment, fragment.javaClass.name)

//        fragmentTransaction.commit()



// b) Key Event doesn't work if showing as a dialog

        val fragment = MyDialogFragment.newInstance()

        fragment.show(supportFragmentManager, fragment.javaClass.name)



    }



    override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {

        Log.i(javaClass.name, "onKeyDown() keyCode: $keyCode")

        return true

    }

}

And my two fragments:

class MyNormalFragment : Fragment() {

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {

        return inflater.inflate(R.layout.fragment_my_normal, container, false)

    }

}





class MyDialogFragment : DialogFragment() {

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {

        return inflater.inflate(R.layout.fragment_my_dialog, container, false)

    }



    companion object {

        fun newInstance() = MyDialogFragment()

    }

}

As soon as I call a) show() to open the MyDialogFragment then the key events are not captured any more. But if I open MyDialogFragment b) via custom Fragments transaction then the key events are still captured, but my Fragment isn't shown as a Dialog any more.

What do I have to do to let the event also trigger when my dialog is displayed?

A Dialog is shown in/as a separate Window, so your Activity doesn't have the focus for keypresses any more. However, the Dialog has it's own onKeyDown method, so you can make use of that.

Ridcully's answer is right. I just wanted to post what I changed inside MyDialogFragment to keep on capturing key events:

class MyDialogFragment : DialogFragment() {

    private val keyEventListener = DialogInterface.OnKeyListener { dialog, keyCode, event ->

        Log.i(javaClass.name, "onKey() keyCode: $keyCode")

        true

    }



    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {

        dialog.setOnKeyListener(keyEventListener)

        return inflater.inflate(R.layout.fragment_my_dialog, container, false)

    }



    override fun onDestroyView() {

        dialog.setOnKeyListener(null)

        super.onDestroyView()

    }



    companion object {

        fun newInstance() = MyDialogFragment()

    }

}