Android测试AsyncTask下载图片

 package com.example.myact8_async;

 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.util.EntityUtils;
 import android.app.ProgressDialog;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.support.v7.app.ActionBarActivity;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.ImageView;
 /**
  * 测试AsyncTask异步任务进行下载图片
  * @Describe:
  * @package: com.example.myact8_async
  * @author shaobn
  * @date 2015-9-11 下午4:03:24
  */
 public class MainActivity extends ActionBarActivity {
     private Button button;
     private ImageView iv;
     private ProgressDialog pd;
     private final static String URLPATH = "http://d.hiphotos.baidu.com/image/pic/item/f3d3572c11dfa9ec919c6f1960d0f703918fc109.jpg";
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         iv = (ImageView) this.findViewById(R.id.imageView1);
         pd = new ProgressDialog(this);
         pd.setTitle("下载提示");
         pd.setMessage("正在下载，请稍后...");
         button = (Button) this.findViewById(R.id.button1);
         button.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View arg0) {
                 // TODO Auto-generated method stub
                 new MyAsync().execute(MainActivity.URLPATH);
             }
         });
     }
     /**
      * 自定义异步任务类
      * @Describe:
      * @package: com.example.myact8_async
      * @author shaobn
      * @date 2015-9-11 下午4:27:09
      */
     public class MyAsync extends AsyncTask<String, Void, Bitmap>{
         //下载进程
         @Override
         protected Bitmap doInBackground(String... arg0) {
             // TODO Auto-generated method stub
             HttpClient hClient = new DefaultHttpClient();
             HttpGet hGet = new HttpGet(MainActivity.URLPATH);
             Bitmap bitmap = null;
             try {
                 //实现图片下载
                 HttpResponse hResponse = hClient.execute(hGet);
                 if(hResponse.getStatusLine().getStatusCode()==200){
                     HttpEntity hEntity = hResponse.getEntity();
                     byte[] byt = EntityUtils.toByteArray(hEntity);
                     bitmap = BitmapFactory.decodeByteArray(byt, 0, byt.length);
                 }
             } catch (Exception e) {
                 // TODO: handle exception
                 e.printStackTrace();
             }
             return bitmap;

         }
         //下载后执行操作
         @Override
         protected void onPostExecute(Bitmap result) {
             // TODO Auto-generated method stub
             super.onPostExecute(result);
             MainActivity.this.iv.setImageBitmap(result);
             MainActivity.this.pd.dismiss();
         }
         //下载前动作
         @Override
         protected void onPreExecute() {
             // TODO Auto-generated method stub
             super.onPreExecute();
             MainActivity.this.pd.show();
         }        

     }

     @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);
     }
 }

自己写的小程序，方便保存一下。