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add_notation.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/etInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="16dp"
        android:inputType=""
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <requestFocus />

    </EditText>


</android.support.constraint.ConstraintLayout>

AddNotationDialogFragment.java

import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;


public class AddNotationDialogFragment extends DialogFragment {

    public interface AddNotationDialogListener {
        void onFinishAddNotationDialog(String inputText);
    }

    private AddNotationDialogListener mListener;
    private EditText mEditText;
    private AlertDialog dialog;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        LayoutInflater inflater = getActivity().getLayoutInflater();
        View view = inflater.inflate(R.layout.add_notation, null);

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle(R.string.enter_new_notation);
        builder.setView(view); //This layout contains only two EditText, ET1 and ET2.
        mEditText = view.findViewById(R.id.etInput);
        mEditText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) { }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) { }

            @Override
            public void afterTextChanged(Editable s) {
                boolean valid = DiceNotation.isValid(s.toString());
                dialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(valid);
            }
        });


        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                AddNotationDialogListener activity = (AddNotationDialogListener) getActivity();
                activity.onFinishAddNotationDialog(mEditText.getText().toString());
                AddNotationDialogFragment.this.dismiss();
            }
        });
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                AddNotationDialogFragment.this.dismiss();
            }
        });
        dialog = builder.create();
        return dialog;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        mListener = (AddNotationDialogListener) getActivity();
    }

}

ItemListActivity.java

// code snippets only  

...
  
  public class ItemListActivity extends AppCompatActivity
        implements AddNotationDialogFragment.AddNotationDialogListener {
          
...
  
@Override
    public void onFinishAddNotationDialog(String id) {
        DummyContent.addItem(new DummyContent.DummyItem(id,"",id));
        adapter.notifyItemInserted(adapter.getItemCount()-1);
    }
          
...

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