问片段中的片段活动调用startactivityforresult，但通知数据集已更改不起作用

EN

Intent returnIntent = new Intent();
                    returnIntent.putExtra("POST_OBJECT", postData);
                    setResult(Activity.RESULT_OK, returnIntent);
                    finish();

Intent editIntent = new Intent(context, MyActivity.class);
        editIntent.putExtra("EDIT_POST", postDetailsData);
        startActivity(editIntent);
        break;    

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
        if (requestCode == ADD_EDIT_POST ) {

                if (data != null && data.hasExtra("POST_OBJECT")) {
                    PostDetailsData postData = (PostDetailsData) data
                            .getSerializableExtra("POST_OBJECT");

                    if (postData != null) {
                        myPostFeedList.add(postData);
                        postAdapter.notifyDataSetChanged();
                        setAdapter();
                    }
                }
            }
        }

private void setAdapter() {
    // if (postAdapter == null) {
    postAdapter = new PostListAdapter(context, myPostFeedList);
    postAdapter.setSwipeOptionClickedListner(this);
    myPostfeedListView.setAdapter(postAdapter);

    postAdapter.notifyDataSetChanged();
    // } else {
    // postAdapter.notifyDataSetChanged();
    // }

}

 @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
}