基于AsyncTask的图片下载

有一阵子没有写程序，连基本的AsyncTask用法都记不清楚了，复习一下于是有了下面的图片加载类。

package com.hitech.download;



import java.io.IOException;



import org.apache.http.HttpResponse;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;



import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.AsyncTask;

import android.util.Log;

import android.widget.ImageView;



public class ImageLoader {



    private static final String TAG = "ImageLoader";

    private String url = null;

    private ImageView imageView = null;



    public ImageLoader() {

    }



    public ImageLoader(String url, ImageView imageView) {

        this.url = url;

        this.imageView = imageView;

    }



    public void execute() {

        new Loader().execute(new String[] { url });

    }



    public class Loader extends AsyncTask<String, String, Bitmap> {



        @Override

        protected void onPreExecute() {

            super.onPreExecute();

        }



        @Override

        protected Bitmap doInBackground(String... params) {

            HttpClient client = new DefaultHttpClient();

            HttpGet request = new HttpGet(params[0]);

            Log.e(TAG, params[0]);

            try {

                HttpResponse response = client.execute(request);

                System.out.println(response.getStatusLine().getStatusCode());

                if (response.getStatusLine().getStatusCode() == 200) {

                    return BitmapFactory.decodeStream(response.getEntity().getContent());

                }

            } catch (ClientProtocolException e) {

                e.printStackTrace();

            } catch (IOException e) {

                e.printStackTrace();

            }

            return null;

        }



        @Override

        protected void onPostExecute(Bitmap bm) {

            super.onPostExecute(bm);

            // imageView.setImageBitmap(bm);

            imageView.setImageBitmap(bm);

        }

    }

}

调用只需要一行简单的代码就能完成图片的加载。

new ImageLoader("http://192.168.0.251/welcome.png", imageView1).execute();

new ImageLoader("http://192.168.0.251/genymotion.png", imageView2).execute();