DialogFragment - 使其成为外部类的成员而不是静态内部类

Question

这是Android教程中的一个小例子，显示了DialogFragment和DatePicker。 它实现为MainActivity的静态内部类。我想知道是否可以更改代码以使其成为MainActivity的成员函数？

编辑：问题是我想在DialogFragment所在的内部类的MainActivity中设置textview。但是这个内部类是静态的 - 实际上是静态的。从静态开始，对主Activity的回调 - 回调函数 - 也必须是静态的。但是，如果此函数是静态的 - 如何在MainActivity中访问textview？

谢谢！

TextView tv;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    tv = (TextView) findViewById(R.id.dateTextView);

 }


 public void showTimePickerDialog(View v) {
      newFragment = new DatePickerFragment();
      newFragment.show(getSupportFragmentManager(), "datePicker"); 
 }

 public static void notifyActivity() {
    // want to change the textview here but cannot since the method is static.
 }



 public static class DatePickerFragment extends DialogFragment
implements DatePickerDialog.OnDateSetListener {

    private int year, month, day;

    @Override
 public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current time as the default values for the picker
        final Calendar c = Calendar.getInstance();

        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);


        DatePickerDialog date = new DatePickerDialog(getActivity(), DatePickerFragment.this, year, month, day);
        date.setButton(DialogInterface.BUTTON_POSITIVE, "OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        notifyActivity(); 
                    }
                });
        return date;

    }