Can’t access “findViewById” in AsyncTask

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Pass your inflated view to the AsyncTask like this :

public class RecuperarComentarisFoto extends AsyncTask<String, String, String>{
private Context mContext;
private View rootView;
[...]
public RecuperarComentarisFoto(Context context, View rootView){
    this.mContext=context;
    this.rootView=rootView;
}
@Override
protected void onPreExecute() {
    [...]
}

@Override
protected String doInBackground(String... arg0) { 
    params.add(new BasicNameValuePair("pid", "1"));
    JSONObject json = jsonParser.makeHttpRequest(url_get_comentaris, "GET", params);
    JSONArray productObj;
    //HERE I RETRIEVE DATA FROM JSON. ITS WORKING OK.

    return null;
}
@Override
protected void onPostExecute(String result) {
    //super.onPostExecute(result);  <--GET RID OF THIS (it will screw up on 2.1 devices)
    this.pDialog.dismiss();
    // use rootview to findViewById
    TextView comentariEditText = (TextView) rootView.findViewById(R.id.commentsMostrar);
}

Then call like so,

View myFragmentView = inflater.inflate(R.layout.fragment_a, container, false);

cont=getActivity();
new RecuperarComentarisFoto(cont, myFragmentView).execute();

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