DialogFragment and force to show keyboard

override onActivityCreated in your dialogfragment and put getDialog().getWindow().setSoftInputMode(LayoutParams.SOFT_INPUT_STATE_VISIBLE); in there

The answer of tyczj does not work for me.

The solution was, inside onCreateDialog

Dialog d = builder.create();
d.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
return d;

In the end, the code would be like this

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    builder
           .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    callback.onYesConnectClick(edit.getText().toString());
                }
            })
            .setNegativeButton(R.string.refuse, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    callback.onNoConnectClick();
                }
            });

    Dialog d = builder.create();
        d.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
return d;
}

Use "SOFT_INPUT_STATE_ALWAYS_VISIBLE" instead of "SOFT_INPUT_STATE_VISIBLE" either in onActivityCreated or onCreateDialog method.

Watch out for the setLayout() call if you use it. It took me a while to realize that it may override your window's attributes. After wrapping it into a handler, the accepted solution worked for me.

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    final Dialog dialog = super.onCreateDialog(savedInstanceState);
    dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);

    return dialog;
}

@Override
public void onStart() {
    super.onStart();

    // without a handler, the window sizes itself correctly
    // but the keyboard does not show up
    new Handler().post(new Runnable() {
        @Override
        public void run() {
            getDialog().getWindow().setLayout(DIALOG_WIDTH, DIALOG_HEIGHT);
        }
    });
}

If you want to show a keyboard after a short delay, you should use another method. Solutions with onActivityCreated and onCreateDialog work right, but for instant keyboard showing. If you have EditText, you should open the keyboard over it, not over a dialog. See pictures at https://stackoverflow.com/a/65007148/2914140.

fun showKeyboard(view: EditText) {
    val imm = view.context.getSystemService(
        Context.INPUT_METHOD_SERVICE) as InputMethodManager?
    imm?.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT)
}


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

    val view = activity?.layoutInflater?.inflate(R.layout.your_layout, null)

    view?.edit_text?.run {
        requestFocus() // Required for showing a keyboard.
        setText("Some text")
        setSelection(text.length)
    }

    val dialogBuilder = MaterialAlertDialogBuilder(requireContext()).apply {
        setView(view)
        // Set message, buttons.
        setCancelable(false)
    }
    val dialog = dialogBuilder.create()

    Handler(Looper.getMainLooper()).postDelayed({
        view?.edit_text?.let { showKeyboard(it) }
    }, 100)
//    Instead of Handler you can use coroutines:
//    lifecycleScope.launch {
//        delay(100)
//        view?.edit_text?.let { showKeyboard(it) }
//    }

    return dialog
}