[JAVA] [Android] How to make Dialog Fragment


public class HogeActivity extends AppCompatActivity  {
    protected void onCreate(Bundle savedInstanceState) {
        Button button = findViewById(R.id.huga_button);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
              //Display a dialog
              DialogFragment dialog = new DialogFragment();
              //Note: getFragmentManager()Will result in an error


public class BookReviewDialogFragment extends DialogFragment {
    //Method called when dialog is generated
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        //Dialog generation Specify and instantiate the AlertDialog Builder class
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity());
        //Title setting
        dialogBuilder.setTitle("Dialog title");
        //Text settings to display
        dialogBuilder.setMessage("please fill in the value");
        //Input field creation
        final EditText editText = new EditText(getActivity());
        //Create OK button
        dialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                //Get value from editText
                String returnValue = editText.getText().toString();
                //Get an instance of HogeActivity
                HogeActivity hogeActivity = (HogeActivity) getActivity();
        //NG button creation
        dialogBuilder.setNegativeButton("NG", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                //Close without doing anything
        //returns dialogBulder
        return dialogBuilder.create();

■ Refer to the character of the OK button of the dialog fragment from @strings

Resources res = getResources();
//Create OK button dialogBuilder.setPositiveButton(res.getString(R.string.ok), new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {

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