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首先我必须说,我已阅读本:获取从OnPostExecute Android的返回值
How to get the return value from onpostexecute method in android?
这:
How do I return a boolean from AsyncTask?
没有帮助,也许我不明白他们在说什么。 这是我的porblem: 我只需要找回在我的OnPostExecute方法的字符串值。 不是从doInBackground,我需要从我的OnPostExecute。
我的代码:
public void max(String build,String cls)
{
BackgroundTask3 myTask = new BackgroundTask3();
myTask.execute(build,cls);
Toast.makeText(getApplicationContext(),"fcur is" + Fcur,Toast.LENGTH_LONG).show();
}
和:
public class BackgroundTask3 extends AsyncTask<String,Void,String>
{
String capacity_url;
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
String finalValue;
json_capacity = result;
finalValue=parseMax();
Toast.makeText(getApplicationContext(),"finalValue is" + finalValue,Toast.LENGTH_LONG).show();
super.onPostExecute(result);
}
@Override
protected void onPreExecute() {
capacity_url = "http://www.skedge.co.il/ANCurrentCapacity.php";
}
@Override
protected String doInBackground(String... params) {
String cls,build;
build= params[0];
cls = params[1];
try {
URL url = new URL (capacity_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
String data_string = URLEncoder.encode("Fclass","UTF-8")+"="+URLEncoder.encode(cls,"UTF-8")+"&"+
URLEncoder.encode("building","UTF-8")+"="+URLEncoder.encode(build,"UTF-8")+"&"+
URLEncoder.encode("hour","UTF-8")+"="+URLEncoder.encode(hour,"UTF-8");
bufferedWriter.write(data_string);
bufferedWriter.flush();
bufferedWriter.close();
//here is the new
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"UTF-8"));
StringBuilder stringBuilder = new StringBuilder();
while ((JSON_STRING = bufferedReader.readLine())!= null)
{
stringBuilder.append(JSON_STRING+"\n");
}
outputStream.close();
inputStream.close();
httpURLConnection.disconnect();
return stringBuilder.toString().trim();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
所有我想要做的是: 分配是在OnPostExecute内最终值的字符串值,到Fcur(公共字符串)这是最大的功能。
看起来很简单,但由于某种原因,我无法完成它。
获得从后台线程回调
我利用这一点也是因为认为接口是实现对asyncTask回调响应的更好方法。 –
@Yarden Rotem,试试这个:http://stackoverflow.com/a/13815960/3332734 –