ListView 闪烁图片错位问题

浅浅的花香味﹌ 2022-09-25 10:16 167阅读 0赞

本文转自[http://www.trinea.cn/android/android-listview-display-error-image-when-scroll/][http_www.trinea.cn_android_android-listview-display-error-image-when-scroll]

# Android ListView滑动过程中图片显示重复错位闪烁问题解决 #

主要分析Android ListView滚动过程中图片显示重复、错乱、闪烁的原因及解决方法，顺带提及ListView的缓存机制。  
1、原因分析  
ListView item缓存机制：为了使得性能更优，ListView会缓存行item(某行对应的View)。ListView通过adapter的getView函数获得每行的item。滑动过程中，

a. 如果某行item已经滑出屏幕，若该item不在缓存内，则put进缓存，否则更新缓存；  
b. 获取滑入屏幕的行item之前会先判断缓存中是否有可用的item，如果有，做为convertView参数传递给adapter的getView。  
更具体可见源代码[ListView.obtainView][]。

这样，如下的getView写法就可以充分利用缓存大大提升ListView的性能。即便上万个行item，最多inflate的次数为n，n为一屏最多显示ListView 行item的个数。

ListView Adapter getView写法

Java

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       6 
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       10 
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       11 
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       12 
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       17 
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       18 
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       22 
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      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">.</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">layout</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">.</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">list_item</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">,</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">null</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">)</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">;</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">holder</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">=</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">new</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">ViewHolder</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">(</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">)</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">;</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span>…… 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">convertView</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">.</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">setTag</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">(</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">holder</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">)</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">;</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">}</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: bold !important; color: rgb(204, 102, 0) !important; background: transparent;">else</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">{ </span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">holder</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">=</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">(</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">ViewHolder</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">)</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">convertView</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">.</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">getTag</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">(</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">)</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">;</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">}</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">}</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;">
       &nbsp; 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(136, 136, 136) !important; background: transparent;">/**</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(136, 136, 136) !important; background: transparent;"> * ViewHolder</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(136, 136, 136) !important; background: transparent;"> * </span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(136, 136, 136) !important; background: transparent;"> * @author trinea@trinea.cn 2013-08-01</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(136, 136, 136) !important; background: transparent;"> */</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">private</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">static</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">class</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">ViewHolder</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">{ </span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;">
       &nbsp; 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">ImageView </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">appIcon</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">;</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">TextView&nbsp;&nbsp;</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">appName</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">;</span> 
     </div> 
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      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;"> </span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(204, 102, 0) !important; background: transparent;">TextView&nbsp;&nbsp;</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(34, 34, 34) !important; background: transparent;">appInfo</span> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">;</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; outline: 0px; vertical-align: baseline; box-sizing: border-box; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(250, 250, 250) !important;"> 
      <span style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: inherit !important; vertical-align: baseline; font-family: inherit; height: inherit; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;">}</span> 
     </div> 
    </div></td> 
  </tr> 
 </tbody> 
</table>

这样提升了性能，但同时也会造成另外一些问题：

a. 行item图片显示重复  
这个显示重复是指当前行item显示了之前某行item的图片。  
比如ListView滑动到第2行会异步加载某个图片，但是加载很慢，加载过程中listView已经滑动到了第14行，且滑动过程中该图片加载结束，第2行已不在屏幕内，根据上面介绍的缓存原理，第2行的view可能被第14行复用，这样我们看到的就是第14行显示了本该属于第2行的图片，造成显示重复。

b. 行item图片显示错乱  
这个显示错乱是指某行item显示了不属于该行item的图片。  
比如ListView滑动到第2行会异步加载某个图片，但是加载很慢，加载过程中listView已经滑动到了第14行，第2行已不在屏幕内，根据上面介绍的缓存原理，第2行的view可能被第14行复用，第14行显示了第2行的View，这时之前的图片加载结束，就会显示在第14行，造成错乱。

c. 行item图片显示闪烁  
上面b的情况，第14行图片又很快加载结束，所以我们看到第14行先显示了第2行的图片，立马又显示了自己的图片进行覆盖造成闪烁错乱。

2、解决方法  
通过上面的分析我们知道了出现错乱的原因是异步加载及对象被复用造成的，如果每次getView能给对象一个标识，在异步加载完成时比较标识与当前行item的标识是否一致，一致则显示，否则不做处理即可。  
下面以使用[ImageCache][]为ListView提供图片获取缓存为例，ListView中强烈推荐使用[ImageCache][]。  
首先在listview adapter的getView中添加

Java

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     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:0px 50%"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">convertView</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">=</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">inflater</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">.</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(204,102,0)!important; background:transparent">inflate</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">(</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">R</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">.</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">layout</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">.</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">list_item</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">,</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(204,102,0)!important; background:transparent">null</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">)</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">;</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:rgb(250,250,250)!important"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">holder</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">=</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(204,102,0)!important; background:transparent">new</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(204,102,0)!important; background:transparent">ViewHolder</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">(</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">)</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">;</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:0px 50%"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span>…… 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:rgb(250,250,250)!important"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">convertView</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">.</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(204,102,0)!important; background:transparent">setTag</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">(</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">holder</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">)</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">;</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:0px 50%"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">}</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:bold!important; color:rgb(204,102,0)!important; background:transparent">else</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">{ </span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:rgb(250,250,250)!important"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">holder</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">=</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">(</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">ViewHolder</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">)</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">convertView</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">.</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(204,102,0)!important; background:transparent">getTag</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">(</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">)</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">;</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:0px 50%"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">}</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:rgb(250,250,250)!important">
       &nbsp; 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:0px 50%"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span>…… 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:rgb(250,250,250)!important"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(136,136,136)!important; background:transparent">// add tag for image, to compare it when image loaded finish</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:0px 50%"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">imageView</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">.</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(204,102,0)!important; background:transparent">setTag</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">(</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(34,34,34)!important; background:transparent">imageUrl</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">)</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">;</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:rgb(250,250,250)!important"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(136,136,136)!important; background:transparent">// if not in cache, restore default</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; outline:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:0px 50%"> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:bold!important; color:rgb(204,102,0)!important; background:transparent">if</span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"> </span> 
      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">(</span> 
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      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">)</span> 
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      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important; background:transparent"></span> 
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      <span style="margin:0px; padding:0px; border:0px; outline:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; height:inherit; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important; background:transparent">}</span> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

其中setTag表示设置标识，方便下面进行标志比对

Cache.ICON\_CACHE为[ImageCache][]的实例，表示如果不在缓存内则设置drawable为null(当然你可以可以设置为你自己的默认资源)，防止显示了之前某个行item的图片，解决了a. 行item图片显示重复问题。

在ImageCache的OnImageCallbackListener的onGetSuccess函数中添加

Java

在上面用String imageUrlTag = (String)imageView.getTag();取得之前设置的tag，然后和当前的url进行比较，如果相等则显示，解决了b. 行item图片显示错乱，c. 行item图片显示错乱的两个问题。其中ObjectUtils可见[ObjectUtils@Github][ObjectUtils_Github].

其他异步加载过程解决原理类似。

[http_www.trinea.cn_android_android-listview-display-error-image-when-scroll]: http://www.trinea.cn/android/android-listview-display-error-image-when-scroll/
[ListView.obtainView]: http://www.grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.0.1_r1/android/widget/AbsListView.java#AbsListView.obtainView%28int%2Cboolean%5B%5D%29
[ImageCache]: http://www.trinea.cn/android/android-imagecache%e5%9b%be%e7%89%87%e7%bc%93%e5%ad%98%ef%bc%8c%e4%bd%bf%e7%94%a8%e7%ae%80%e5%8d%95%ef%bc%8c%e6%94%af%e6%8c%81%e9%a2%84%e5%8f%96%ef%bc%8c%e6%94%af%e6%8c%81%e5%a4%9a%e7%a7%8d%e7%bc%93/
[ObjectUtils_Github]: https://github.com/Trinea/AndroidCommon/blob/master/src/cn/trinea/android/common/util/ObjectUtils.java