ImageLoader最新框架解析

绝地灬酷狼 2022-08-02 04:54 200阅读 0赞

一般会在自己的Application子类的onCreate（）方法中对ImageLoader进行配置

#### (1) ImageLoaderConfiguration各属性解释 ####

l 偷懒点可以直接使用缺省的配置ImageLoaderConfiguration:

ImageLoaderConfiguration configuration = ImageLoaderConfiguration.createDefault(this);

l 也可以自定义ImageLoaderConfiguration:

ImageLoaderConfiguration类Field详解：

<table style="margin:0px 0px 1.714285714rem; padding:0px; border-width:0px 0px 1px; border-bottom-style:solid; border-bottom-color:rgb(237,237,237); font-size:0.857142857rem; vertical-align:baseline; border-collapse:collapse; border-spacing:0px; color:rgb(117,117,117); line-height:24px; width:1011px; font-family:'Open Sans',Helvetica,Arial,sans-serif"> 
 <tbody style="margin:0px; padding:0px; border:0px; font-size:12px; vertical-align:baseline"> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Filed名称</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Filed意义</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 缺省默认值</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Builder中设置方法</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Int maxImageWidthForMemoryCacheInt maxImageHeightForMemoryCache</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 内存缓存图片的最大宽高</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 屏幕的宽高度</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> memoryCacheExtraOptions(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Int maxImageWidthForDiskCacheInt maxImageHeightForDiskCache</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 磁盘缓存图片的最大宽高</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 0,0</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> discCacheExtraOptions（…）或者diskCacheExtraOptions（…）</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> BitmapProcessor processorForDiskCache</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 图片处理器，负责从磁盘缓存读取或写入前对图片进行处理</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> null</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> discCacheExtraOptions（…）或者diskCacheExtraOptions（…）</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Executor taskExecutor</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 缓存线程池</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DefaultConfigurationFactory.createExecutor(…)；</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> taskExecutor(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Executor taskExecutorForCachedImages</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 下载缓存图片的线程池</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DefaultConfigurationFactory.createExecutor(…)；</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> taskExecutorForCachedImages（…）</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Boolean customExecutor</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 是否自定义线程池</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> false</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 无</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Boolean customExecutorForCachedImages</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 是否自定义下载缓存图片的线程池</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> false</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 无</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Int threadPoolSize</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 线程池数</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 3</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> threadPoolSize(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Int threadPriority</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 线程优先级</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Thread.NORM_PRIORITY – 2</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> threadPriority(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> QueueProcessingType tasksProcessingType</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 片下载和显示的工作队列排序</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> QueueProcessingType.FIFO</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> tasksProcessingOrder(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> MemoryCache memoryCache</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 指定内存缓存的实现</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DefaultConfigurationFactory.createMemoryCache(…)</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> memoryCache(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DiskCache diskCache</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 指定磁盘缓存的实现</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DefaultConfigurationFactory.createDiskCache(…);</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> discCache(…)或者 diskCache(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> ImageDownloader downloader</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 图片下载器，负责从图片的各个来源获取输入流</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> imageDownloader(…)</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DefaultConfigurationFactory.createImageDownloader(context);</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> ImageDecoder decoder</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 图片解码器，负责将图片输入流InputStream转换为Bitmap对象</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DefaultConfigurationFactory.createImageDecoder(writeLogs);</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> imageDecoder(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DisplayImageOptions defaultDisplayImageOptions;</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 缺省的图片显示的配置项</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DisplayImageOptions.createSimple();</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> defaultDisplayImageOptions(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> ImageDownloader networkDeniedDownloader</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 不允许访问网络的图片下载器</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> networkDeniedDownloader = new NetworkDeniedImageDownloader(downloader);</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 无</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> ImageDownloader slowNetworkDownloader</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 慢网络情况下的图片下载器</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> slowNetworkDownloader = new SlowNetworkImageDownloader(downloader);</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 无</td> 
  </tr> 
 </tbody> 
</table>

#### (2) DisplayImageOptions各属性解释 ####

l 创建默认的DisplayImageOptions:

DisplayImageOptions option\_0 = DisplayImageOptions.createSimple();

l 也可以自定义DisplayImageOptions:

DisplayImageOptions类Field详解

<table style="margin:0px 0px 1.714285714rem; padding:0px; border-width:0px 0px 1px; border-bottom-style:solid; border-bottom-color:rgb(237,237,237); font-size:0.857142857rem; vertical-align:baseline; border-collapse:collapse; border-spacing:0px; color:rgb(117,117,117); line-height:24px; width:989px; font-family:'Open Sans',Helvetica,Arial,sans-serif"> 
 <tbody style="margin:0px; padding:0px; border:0px; font-size:12px; vertical-align:baseline"> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Filed名称</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Field意义</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 缺省默认值</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Builder中设置方法</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> int imageResOnLoadingDrawable imageOnLoading</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 图片下载期间显示的图片</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 0</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> showStubImage(…)或者showImageOnLoading(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> int imageResForEmptyUriDrawable imageForEmptyUri</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 空 uri 时的占位图片</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 0</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> showImageForEmptyUri(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> int imageResOnFailDrawable imageOnFail</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 图片下载失败时展示图片</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> &nbsp;</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> showImageOnFail(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> boolean resetViewBeforeLoading</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 在加载前是否重置 view</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> false</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> resetViewBeforeLoading()或者resetViewBeforeLoading(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> boolean cacheInMemory</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 是否启用内存缓存</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> false</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> cacheInMemory()或者cacheInMemory(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> boolean cacheOnDisk</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 是否启用磁盘缓存</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> false</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> cacheOnDisc()或者cacheOnDisc(…) <p style="margin-top:0px; margin-bottom:1.714285714rem; padding-top:0px; padding-bottom:0px; border:0px; vertical-align:baseline; line-height:1.714285714"> </p> <p style="margin-top:0px; margin-bottom:1.714285714rem; padding-top:0px; padding-bottom:0px; border:0px; vertical-align:baseline; line-height:1.714285714"> 或者cacheOnDisk（…）</p> </td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> ImageScaleType imageScaleType</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 图片的缩放类型</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> ImageScaleType.IN_SAMPLE_POWER_OF_2</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> imageScaleType(ImageScaleType imageScaleTy）</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Options decodingOptions</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 为 BitmapFactory.Options，用于BitmapFactory.decodeStream(imageStream, null, decodingOptions)得到图片尺寸等信息</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Options decodingOptions = new Options();</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> bitmapConfig(Bitmap.Config bitmapConfig)decodingOptions(Options decodingOptions)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> int delayBeforeLoading</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 设置在开始加载前的延迟时间，单位为毫秒</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 0</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> delayBeforeLoading(int delayInMillis)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> boolean considerExifParams</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 是否考虑图片的 EXIF 信息（括机身、镜头型号、拍摄时间、相机快门次数）</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> false</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> considerExifParams(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Object extraForDownloader</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 下载器需要的辅助信息</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> null</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> extraForDownloader(Object extra)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> BitmapProcessor preProcessor</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 缓存在内存之前的处理程序</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> null</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> preProcessor(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> BitmapProcessor postProcessor</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 缓存在内存之后的处理程序</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> null</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> postProcessor(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> BitmapDisplayer displayer</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 图片的显示方式</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> DefaultConfigurationFactory.createBitmapDisplayer();</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> displayer(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> Handler handler</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> handler 对象,消息处理</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> null</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> handler(…)</td> 
  </tr> 
  <tr style="margin:0px; padding:0px; border:0px; vertical-align:baseline"> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> boolean isSyncLoading</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> 是否同步加载</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> false</td> 
   <td style="margin:0px; padding:6px 10px 6px 0px; border-width:1px 0px 0px; border-top-style:solid; border-top-color:rgb(237,237,237); vertical-align:baseline"> syncLoading(…)</td> 
  </tr> 
 </tbody> 
</table>

> (3) 自定义配置总结：
> 
> 1) Imageloader提供的缺省的ImageLoaderConfiguration和缺省的DisplayImageOptions已经基本可以满足我们正常的需求，如果没有特殊的需要可以不用再修改；2) ImageLoaderConfiguration的Builder中的diskCache()方法, diskCacheSize() 方法以及diskCacheFileCount（）方法彼此功能重叠的，如果设置了其中一个，就不要再设置其他的了；
> 
> 3) ImageLoaderConfiguration的Builder中的diskCache()方法 和 diskCacheFileNameGenerator()方法彼此功能重叠的，如果设置了其中一个，就不要再设置其他的了；
> 
> 4) ImageLoaderConfiguration的Builder中的memoryCache() 方法和memoryCacheSize()方法 彼此功能重叠的，如果设置了其中一个，就不要再设置其他的了。
> 
> 1.2.补充理解：三大关键对象关系
> 
> 1) ImageLoader：
> 
> 具体下载图片，缓存图片，显示图片的具体执行类，它有两个具体的方法displayImage(…)、loadImage(…)，但是其实最终他们的实现都是displayImage(…)
> 
> 2) ImageLoaderConfiguration：
> 
> 图片缓存的全局配置，主要有线程类、缓存大小、磁盘大小、图片下载与解析、日志方面的配置
> 
> 3) DisplayImageOptions：
> 
> 指导每一个Imageloader根据网络图片的状态（空白、下载错误、正在下载）显示对应的图片，是否将缓存加载到磁盘上，下载完后对图片进行怎么样的处理
> 
> 4) 三者关系的形象比喻：
> 
> 这三者就像是公司执行机构、公司规章制度以及客户需求,ImageLoaderConfiguration就像一个公司的规章制度，里面规定了一个公司全局性的性质；ImageLoader就像是一个公司的执行机构，会给客户创造出客户想要的产品；DisplayImageOptions就像是每一个客户的具体需求，公司执行结构会根据这个需求最终决定如何生产那个产品。

## 2.各式缓存方式任你选择 ##

> 2.1.DiskCache 磁盘缓存
> 
> 1) UnlimitedDiscCache不限制缓存大小；2) UnlimitedDiscCache很简单它只是简单的继承了BaseDiscCache并未对BaseDiscCache做任何扩展；
> 
> 3) LimitedAgeDiscCache限制缓存时间；
> 
> 4) LimitedAgeDiscCache该类实现了在缓存中删除被加载超过规定时间的文件：满足以下条件的时候就从缓存中删除文件：系统当前时间-文件的最新修改时间 > maxFileAge；
> 
> 2.2.MemoryCache内存缓存
> 
> 1) 通过实现接口MemoryCacheAware <String,Bitmap>来实现自己的缓存
> 
> 2) UsingFreqLimitedCache (最少被用到的对象会被删除)
> 
> 3) UsingAgeLimitedCache (最早被添加的对象会被删除)
> 
> 4) LargestLimitedCache (空间占用最大的对象会被删除)
> 
> 5) FIFOLimitedCache (根据先进先出的原则上删除多余对象)  
> 2.3.不要忘记缓存的清理
> 
> 一般要在整个应用结束的时候调用下面两个方法，分别情况内存缓存和磁盘缓存，提高用户体验 ：
> 
> i. imageLoader.clearMemoryCache();
> 
> ii. imageLoader.clearDiskCache();

## 3. 网络图片获取想停就停 ##

> 主要是用于GirdView,ListView加载图片的情况，因为这两个控件展示图片的时候会出现滑动操作，为了更友好的用户体验，可以设置GirdView,ListView的setOnScrollListener监听事件。
> 
> listView.setOnScrollListener(new PauseOnScrollListener(imageLoader, pauseOnScroll, pauseOnFling));gridView.setOnScrollListener(new PauseOnScrollListener(imageLoader, pauseOnScroll, pauseOnFling));
> 
> pauseOnScroll—是否在滑动过程中停止加载图片
> 
> pauseOnFling—是否在快速猛的滑动中停止加载图片

## 4.图像大小由你控制 ##

#  #

> 在ImageLoadingListener接口有以下几个状态监听，用于监听图片下载的不同状态：
> 
> 1) onLoadingStarted(String imageUri, View view)；2) onLoadingFailed(String imageUri, View view, FailReason failReason)；
> 
> 3) onLoadingComplete(String imageUri, View view, Bitmap loadedImage)：
> 
> 在图片加载成功之后，可以对获取到的Bitmap进行各种大小设置，图形裁剪操作以及动画效果添加等，
> 
> 最后再加图片展示到控件上。
> 
> 4) onLoadingCancelled(String imageUri, View view)。

## 5.注意事项 ##

#  #

> 使用了ImageLoader可以有效的避免程序加载图片出现OOM的情况，但是也不是百分之百的屏蔽这个问题，在有的时候，还是会出现，这个时候，我们 可以从下面几个思路去优化我们的ImageLoader
> 
> 1) 减少配置之中线程池的大小，(.threadPoolSize).推荐1-5；2) 使用.bitmapConfig(Bitmap.config.RGB\_565)代替ARGB\_8888;
> 
> 3) 使用.imageScaleType(ImageScaleType.IN\_SAMPLE\_INT)或者 try.imageScaleType(ImageScaleType.EXACTLY)；
> 
> 4) 避免使用RoundedBitmapDisplayer.他会创建新的ARGB\_8888格式的Bitmap对象；
> 
> 5) 使用.memoryCache(new WeakMemoryCache())，不要使用.cacheInMemory();

## 6.下载地址：   https://github.com/nostra13/Android-Universal-Image-Loader ##