I was trying to create a AsyncTask to get some data from server side. But it reports a Null pointer exception in onPostExecute() in line "IOUtils.copy((response_.getEntity().getContent()), writer);" I use some logs to see what happens and found log 1 and 3 were printed but log 2 was not. Why onPostExecute was executed before client.executed() finish? Anyone can give some suggestions?
private class GetForm extends AsyncTask<String, Integer, Object> {
private HttpResponse response_;
private Exception exception_;
private String url_;
public GetForm(String url) {
super();
url_ = url;
}
protected Object doInBackground(String... params) {
try {
Log.i("mylog","inside doInbackground 1.");
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(url_);
response_ = client.execute(request);
Log.i("mylog","inside doInbackground 2.");
} catch (Exception e) {
exception_ = e;
}
return response_;
}
@Override
protected void onPostExecute(Object o) {
// Your current UI stuff here.
Log.i("mylog","inside onPostExecute 3.");
StringWriter writer = new StringWriter();
try{
IOUtils.copy((response_.getEntity().getContent()), writer);
......
}catch(IOException e) {
e.printStackTrace();
}
}
}
