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。