AsyncTask不适用于4.0.4
我创建了一个下面的类去上网，并发送一个请求到PHP脚本。 我创建它像AsyncTask而不是在主线程中，以便在4.0.4上工作，但是当我测试它时，它不起作用，虽然它在2.2上可以正常工作。 你知道什么是问题吗？
class download extends AsyncTask<String, Integer, String> {
protected String doInBackground(String s1, String s2) {
String result = "";
//http post
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("Vreme", s1));
nameValuePairs.add(new BasicNameValuePair("Datum", s2));
InputStream is = null;
try {
String adresa = "http://senzori.open.telekom.rs/script.php";
HttpPost httppost = new HttpPost(adresa);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
}
//convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
return result;
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
return null;
}
}
这可能不起作用，因为你重载了doInBackground，但没有调用重载方法。
改变它，所以原来的方法是这样的：
@Override
protected String doInBackground(String... params) {
return doInBackground (params[0], params[1]);
}
请注意，它现在使得重载无用，将代码移回到重载doInBackground (String... params) ，并且还需要确保在调用execute()时提供两个字符串作为参数。