Dialog to ask for string to enter

dialog_custom_edit_text.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="wrap_content">

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="24dp"
        android:layout_marginRight="24dp"
        android:layout_marginTop="8dp"
        android:maxLength="64"
        tools:text="Hello">
    </EditText>

</FrameLayout>

EnterStringDialogFragment.java

package ru.mobileup.myalarm2.ui.dialog;

import android.app.Activity;
import android.app.Dialog;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.StringRes;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatDialogFragment;
import android.widget.EditText;

import ru.mobileup.myalarm2.R;

/**
 * Dialog to ask for string to enter
 * @author Vasili Chyrvon (vasili.chyrvon@gmail.com)
 */
public class EnterStringDialogFragment extends AppCompatDialogFragment {

    private static final String ARGS_TITLE_RES_ID = "args_title";
    private static final String ARGS_HINT = "args_hint";
    private OnStringEnteredListener mListener;
    private EditText mEditText;

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        try {
            mListener = (OnStringEnteredListener) getParentFragment();
        } catch (ClassCastException e) {
            throw new ClassCastException(getParentFragment().toString() + " must implement OnStringEnteredListener");
        }
    }

    public static EnterStringDialogFragment newInstance(@StringRes int titleResId, String hint) {

        Bundle args = new Bundle();
        args.putInt(ARGS_TITLE_RES_ID, titleResId);
        args.putString(ARGS_HINT, hint);

        EnterStringDialogFragment fragment = new EnterStringDialogFragment();
        fragment.setArguments(args);
        return fragment;
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new AlertDialog.Builder(getContext())
                .setTitle(getArguments().getInt(ARGS_TITLE_RES_ID))
                .setView(R.layout.dialog_custom_edit_text)
                .setPositiveButton(R.string.save, (dialog, which) -> mListener.onStringEntered(mEditText.getText().toString()))
                .setNegativeButton(R.string.cancel, (dialog, which) -> dismiss())
                .create();
    }

    @Override
    public void onStart() {
        super.onStart();
        mEditText = (EditText) getDialog().findViewById(R.id.edit_text);
        mEditText.setHint(getArguments().getString(ARGS_HINT));
    }

    public interface OnStringEnteredListener {
        void onStringEntered(String string);
    }
}