AsyncTask异步请求工具类



import android.os.AsyncTask;

import java.io.InputStream;
import java.io.StreamTokenizer;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by john on 2018/2/23.
 */

public class MyTask extends AsyncTask<String,Void,String>{
    private IcallBack icallBack;
    private String streamtostr;
    private MyTask(){}

    public MyTask(IcallBack icallBack) {
        this.icallBack = icallBack;
    }

    @Override
    protected String doInBackground(String... strings) {
        String str="";
        try{

            URL url=new URL(strings[0]);
            HttpURLConnection urlConnection= (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setReadTimeout(5000);
            urlConnection.setConnectTimeout(5000);
            if (urlConnection.getResponseCode()==200){
                InputStream inputStream = urlConnection.getInputStream();
                streamtostr = StreamtoStr.streamtostr(inputStream, "utf-8");

            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return streamtostr;
    }

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        icallBack.updateUiByjson(s);
    }
    public interface  IcallBack{
        void updateUiByjson(String string);
    }
}