Question

当我尝试在arrivalInfoArrayList.size()的{{1}}中打印onPostExecute时，结果就是我想要的。尽管在Tab1Fragment class之外，它始终打印onPostExecute 有什么问题... 请帮助我...

ArrivalAsync.java

TabFragment1.java

 public class ArrivalAsync extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... urls) {
        try {
            return downloadByUrl(urls[0]);
        } catch (Exception e) {
            return "Download failed";
        }
    }

    public String downloadByUrl(String apiUrl) throws IOException {
        HttpURLConnection conn = null;
        BufferedReader bufferedReader;
        String data;

        try {
            URL url = new URL(apiUrl);
            conn = (HttpURLConnection)url.openConnection();

            BufferedInputStream bufferedInputStream = new BufferedInputStream(conn.getInputStream());

            bufferedReader = new BufferedReader(new InputStreamReader(bufferedInputStream, "utf-8"));
            String line = null;
            data = "";
            while((line = bufferedReader.readLine()) != null) {
                data += line;
            }

            return data;

        } finally {
            conn.disconnect();
        }
    }

}

Answer 1

使用

new calc_stanica().execute(arraylistobjext);

访问AsyncTask

public class calc_stanica extends AsyncTask<String, Void, ArrayList<String>> {
        @Override
        protected ArrayList<String> doInBackground(String... args) {
           ...
        }

        @Override
        protected void onPostExecute(ArrayList<String> result) {
           ... //do something with the result list here
        }
}

onPostExecute中的android-ArrayList

1 个答案: