异步任务不工作

Question

我正在尝试从here 中提取数据。我想提取所有数据并将其打印在日志猫上，我正在使用 AsyncTask 获取数据但没有获取数据。

toast 没有出现，Log Cat 窗口也没有打印出任何东西。

这是我的代码：

package com.example.name.bill;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import org.json.JSONObject;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class Login extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        new MyTask();
    }

    private void readStream(InputStream in)
    {
        Log.e("TAG", in.toString());
    }

    class MyTask extends AsyncTask<URL , Integer, JSONObject>
    {
        @Override
        protected void onPreExecute() {
        }

        @Override
        protected JSONObject doInBackground(URL... s) {
            try {
                URL url = new URL("http://researchweb.iiit.ac.in/~name.jain/data");
                Toast.makeText(Login.this, "Hello Name", Toast.LENGTH_SHORT).show();
                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.connect();
                urlConnection.getResponseCode();
                InputStream in = new BufferedInputStream(urlConnection.getInputStream());
                readStream(in);
                urlConnection.disconnect();
            } catch (java.io.IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
        }

        @Override
        protected void onPostExecute(JSONObject jsonObject) {
        }
    }
}

请告诉我哪里出错了。

注意：链接中提供的数据不保密，仅供学习。

UPD1：

原木猫：

11-06 17:12:03.544 5433-5433/? I/art: Late-enabling -Xcheck:jni

11-06 17:12:04.008 5433-5477/com.example.name.bill D/OpenGLRenderer: Render dirty regions requested: true

11-06 17:12:04.026 5433-5433/com.example.name.bill D/Atlas: Validating map...

11-06 17:12:04.154 5433-5477/com.example.name.bill I/Adreno-EGL: <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_LA.BF.1.1.04.04.02.162.107_msm8226_LA.BF.1.1__release_AU ()

11-06 17:12:04.154 5433-5477/com.example.name.bill I/Adreno-EGL: OpenGL ES Shader Compiler Version: E031.25.01.03

11-06 17:12:04.154 5433-5477/com.example.name.bill I/Adreno-EGL: Build Date: 10/28/14 Tue

11-06 17:12:04.154 5433-5477/com.example.name.bill I/Adreno-EGL: Local Branch:

11-06 17:12:04.154 5433-5477/com.example.name.bill I/Adreno-EGL: Remote Branch: quic/l_LNX.LA.3.6

11-06 17:12:04.154 5433-5477/com.example.name.bill I/Adreno-EGL: Local Patches: NONE

11-06 17:12:04.154 5433-5477/com.example.name.bill I/Adreno-EGL: Reconstruct Branch: AU_LINUX_ANDROID_LA.BF.1.1.04.04.02.162.107 + cb93e16 + f50fe49 + d7c18e6 + 5b9a565 + 0f3a25d + 607156e + 75511aa + e4d16c0 + 686f3eb + 211a271 + dd281ee + NOTHING

11-06 17:12:04.157 5433-5477/com.example.name.bill I/OpenGLRenderer: Initialized EGL, version 1.4

11-06 17:12:04.194 5433-5477/com.example.name.bill D/OpenGLRenderer: Enabling debug mode 0

11-06 17:12:08.274 5433-5684/com.example.name.bill E/TAG: java.io.BufferedInputStream@2ad62e1f

11-06 17:12:36.697 5433-5443/com.example.name.bill W/art: Suspending all threads took: 5.339ms

Answer 1

喜欢

new MyTask().execute();

也删除

Toast.makeText(Login.this, "Hello Lashit", Toast.LENGTH_SHORT).show(); 

来自InBackground(....)

Answer 2

使用它..我已经用你的 URL 测试过...

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        new TheTask().execute("http://researchweb.iiit.ac.in/~lashit.jain/data");

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }



    class TheTask extends AsyncTask<String,String,String>
    {

            ProgressDialog pd=null;

            @Override
            protected void onPreExecute() {
                // TODO Auto-generated method stub
                super.onPreExecute();
                pd = new ProgressDialog(MainActivity.this);
                pd.show();
            }

            @Override
            protected String doInBackground(String... params) {
                 try
                    {
                        HttpClient httpclient = new DefaultHttpClient();
                        HttpPost method = new HttpPost(params[0]);
                        HttpResponse response = httpclient.execute(method);
                        HttpEntity entity = response.getEntity();
                        if(entity != null){
                            return EntityUtils.toString(entity);
                        }
                        else{
                            return "No string.";
                        }
                     }
                     catch(Exception e){
                         return "Network problem";
                     }

            }

            @Override
            protected void onPostExecute(String result) {
                // TODO Auto-generated method stub
                super.onPostExecute(result);

                Log.e("result",result);

                if(pd!=null) pd.dismiss();
            }




        }
}