APPlication

public class MyAppclition extends Application{

    @Override
    public void onCreate() {
        super.onCreate();
        //获取sd卡根目录路径
        File files = new File("/sdcard/Rimg");
        initImageLoader(getApplicationContext(),files);
    }
    public static void initImageLoader(Context context, File file) {
        // This configuration tuning is custom. You can tune every option, you may tune some of them,
        // or you can create default configuration by
        //  ImageLoaderConfiguration.createDefault(this);
        // method.
        ImageLoaderConfiguration.Builder config = new ImageLoaderConfiguration.Builder(context);
        config.threadPriority(Thread.NORM_PRIORITY - 2);//线程池内加载的数量
        config.denyCacheImageMultipleSizesInMemory();
        config.diskCacheFileNameGenerator(new Md5FileNameGenerator());
        config.diskCacheSize(50 * 1024 * 1024); // 50 MiB
        config.tasksProcessingOrder(QueueProcessingType.LIFO);
        // config.diskCache(true);
        config.writeDebugLogs(); // Remove for release app
        config .diskCache(new UnlimitedDiskCache(file));//UnlimitedDiskCache 限制这个图片的缓存路径
        config .diskCacheFileCount(50);//配置sdcard缓存文件的数量
        // Initialize ImageLoader with configuration.
        ImageLoader.getInstance().init(config.build());
    }

}

这是对图片的对图片的缓存， 在线程池里