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  • 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();
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  • 原文地址:https://www.cnblogs.com/magics/p/3922888.html
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