android 图片缓存LruCache(二)

来源：互联网发布：sql server select if 编辑：程序博客网时间：2024/04/29 23:58

针对上一章的图片缓存，本章增加网络请求；如需完整的图片缓存，需要在本章的基础上，增加sd卡缓存。

public class ImageLoader {    ImageCache imageCache = new ImageCache();    ExecutorService executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());    public void displayImage(final String url, final ImageView imageView){        Bitmap bitmap = imageCache.get(url);        if(bitmap != null){            imageView.setImageBitmap(bitmap);            return;        }        imageView.setTag(url);                //TODO 需另外增加sd卡缓存        executorService.submit(new Runnable() {            @Override            public void run() {                Bitmap bitmap = downloadImage(url);                if (bitmap == null){                    return;                }                if(imageView.getTag().equals(url)){                    imageView.setImageBitmap(bitmap);                }                imageCache.put(url,bitmap);            }        });    }


//TODO 如需扩展，需另外建立一个类，用来管理下载，本类只做图片加载赋值
    public Bitmap downloadImage(String imageUrl){        Bitmap bitmap = null;        try{            URL url = new URL(imageUrl);            final HttpURLConnection connection = (HttpURLConnection)url.openConnection();            bitmap = BitmapFactory.decodeStream(connection.getInputStream());            connection.disconnect();        }catch (Exception e){            e.printStackTrace();        }        return bitmap;    }}

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