title: Error when building APK in android studio
body: <p>in my project there <code>DialogFragment</code>.</p>
  
  <pre><code>public class MyDatePicer extends DialogFragment implements DatePickerDialog.OnDateSetListener {
      private TextView tv;
  
      public MyDatePicer(TextView tv) {
          this.tv = tv;
      }
  
      @NonNull
      @Override
      public Dialog onCreateDialog(Bundle savedInstanceState) {
  
          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);
  
          Dialog picker = new DatePickerDialog(getActivity(), this, year, month, day);
          picker.setTitle("Выбереите дату");
          return picker;
      }
  
      @Override
      public void onStart() {
          super.onStart();
          Button nButton = ((AlertDialog) getDialog())
                  .getButton(DialogInterface.BUTTON_POSITIVE);
          nButton.setText("Готово");
      }
  
      @Override
      public void onDateSet(android.widget.DatePicker datePicker, int year,int month, int day) {
          tv.setText(day + "-" + (month + 1) + "-" + year);
      }
  }
  </code></pre>
  
  <p>and in my passage I call it:</p>
  
  <pre><code> dateBegin = (TextView) v.findViewById(R.id.dateBegin);
          dateEnd = (TextView) v.findViewById(R.id.dateEnd);
  
  ....
   case R.id.dateBegin:
                  dateDialog = new MyDatePicer(dateBegin);
                  dateDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
                  break;
              case R.id.dateEnd:
                  dateDialog = new MyDatePicer(dateEnd);
                  dateDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
                  break;
  </code></pre>
  
  <p>everything works as I need to. I run on the emulator and on my phone and it works. but when I try to build an android APK studio produces an error:</p>
  
  <pre><code>Error:Error: This fragment should provide a default constructor (a public constructor with no arguments) (com.managment.pavel.managmentgradle.fragments.MyDatePicer) [ValidFragment]
  </code></pre>
  
  <p>I do not know how else to convey View(TextView my date) in another class. I do not know how to build APK so that I have. tell me what do I fix?</p>