package com.example.asynctask;

 import java.net.MalformedURLException;

 import java.net.URL;

 import android.app.Activity;

 import android.os.AsyncTask;

 import android.os.Bundle;

 import android.util.Log;

 import android.view.Menu;

 import android.view.MenuItem;

 import android.widget.TextView;

 /**

  * 异步任务实现，可以实现直接修改UI线程的控件。

  * @author shb

  *

  */

 public class MainActivity extends Activity {

     private TextView tView;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         tView = (TextView) this.findViewById(R.id.textView1);

         TestAsyn testAsyn = new TestAsyn();

         try {

             testAsyn.execute(new URL("https://www.baidu.com/img/bd_logo1.png"));

         } catch (MalformedURLException e) {

             // TODO Auto-generated catch block

             e.printStackTrace();

         }

     }

     public class TestAsyn extends AsyncTask<URL,Integer,String> {

         @Override

         protected String doInBackground(URL... arg0) {

             // TODO Auto-generated method stub

             return arg0[0].toString();

         }

         @Override

         protected void onPostExecute(String result) {

             // TODO Auto-generated method stub

             super.onPostExecute(result);

             MainActivity.this.tView.setText(result);

         }

         @Override

         protected void onPreExecute() {

             // TODO Auto-generated method stub

             super.onPreExecute();

             Log.d("msg","onPreex");

         }

     }

 }