Retrieve and set data from DialogFragment (DatePicker)

Question

My DialogFragment class is invoked when I press a button on a activity. I want the date set through this DialogFragment to be displayed on the buttons text. FindViewById re

Answer 1

here's a good pattern to follow:

1. create a listener interface in your dialog to handle the relevant button presses in the dialog
2. implement it in the starting activity
3. when the user presses "okay" or "cancel", call the listener methods
4. do whatever you need to do in the impl of the listener to update the activity's view

something like,

class MyDialogFragment extends DialogFragment implements DialogInterface.OnClickListener {
  static interface Listener {
    void onOkay(MyObject result);
    void onCancel();
  }
  ...

  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    ...

    // set this as a listener for ok / cancel buttons
    return new AlertDialog.Builder(activity)...whatever...
        .setPositiveButton(R.string.ok, this)
        .setNegativeButton(R.string.cancel, this).create();
  }

  @Override
  public void onClick(DialogInterface dialog, int which) {
      if (which == DialogInterface.BUTTON_POSITIVE) {
          if (getActivity() instanceof Listener) {
              ((Listener)getActivity()).onOkay(...);
          }
      } else {
          if (getActivity() instanceof Listener) {
              ((Listener)getActivity()).onCancel();
          }
      }
  }
}

class MyActivity extends Activity implements MyDialogFragment.Listener {
  ...
  @Override
  public void onOkay(MyObject result) {
    // update activity view here with result
  }

  @Override
  public void onCancel() {
    // anything?
  }
}

if your case, the "result" passed into the onOkay() method would be the Date object picked by the user in the dialog.