android ayntask原理,android - How to get a string back from AsyncTask? - Stack Overflow

I have the following class:

public class getURLData extends AsyncTask{

@Override

protected String doInBackground(String... params) {

String line;

try {

DefaultHttpClient httpClient = new DefaultHttpClient();

HttpPost httpPost = new HttpPost(params[0]);

HttpResponse httpResponse = httpClient.execute(httpPost);

HttpEntity httpEntity = httpResponse.getEntity();

line = EntityUtils.toString(httpEntity);

} catch (UnsupportedEncodingException e) {

line = "Can't connect to server";

} catch (MalformedURLException e) {

line = "Can't connect to server";

} catch (IOException e) {

line = "Can't connect to server";

}

return line;

}

@Override

protected void onPostExecute(String result) {

super.onPostExecute(result);

}

}

And I am trying to call it like this:

String output = null;

output = new getURLData().execute("http://www.domain.com/call.php?locationSearched=" + locationSearched);

But the output variable isn't getting data, instead I am getting an error:

Type mismatch: cannot convert from AsyncTask to String