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ViewHolder的超简洁写法
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<time title="创建时间：2016-08-17 01:21:00" itemprop="dateCreated datePublished" datetime="2016-08-17T01:21:00+08:00">2016-08-17</time>
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<p>ViewHoder如下:</p>
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<figure class="highlight pgsql"><table><tr><td class="gutter"><pre><span class="line">1</span></pre></td><td class="code"><pre><span class="line"><span class="built_in">public</span> <span class="keyword">class</span> ViewHolder &#123; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">2</span></pre></td><td class="code"><pre><span class="line"> // I added a generic <span class="keyword">return</span> <span class="keyword">type</span> <span class="keyword">to</span> reduce the casting noise <span class="keyword">in</span> client code </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">3</span></pre></td><td class="code"><pre><span class="line"> @SuppressWarnings("unchecked") </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">4</span></pre></td><td class="code"><pre><span class="line"> <span class="built_in">public</span> static &lt;T extends <span class="keyword">View</span>&gt; T <span class="keyword">get</span>(<span class="keyword">View</span> <span class="keyword">view</span>, <span class="type">int</span> id) &#123; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">5</span></pre></td><td class="code"><pre><span class="line"> SparseArray&lt;<span class="keyword">View</span>&gt; viewHolder = (SparseArray&lt;<span class="keyword">View</span>&gt;) <span class="keyword">view</span>.getTag(); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">6</span></pre></td><td class="code"><pre><span class="line"> <span class="keyword">if</span> (viewHolder == <span class="keyword">null</span>) &#123; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">7</span></pre></td><td class="code"><pre><span class="line"> viewHolder = <span class="built_in">new</span> SparseArray&lt;<span class="keyword">View</span>&gt;(); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">8</span></pre></td><td class="code"><pre><span class="line"> <span class="keyword">view</span>.setTag(viewHolder); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">9</span></pre></td><td class="code"><pre><span class="line"> &#125; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">10</span></pre></td><td class="code"><pre><span class="line"> <span class="keyword">View</span> childView = viewHolder.<span class="keyword">get</span>(id); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">11</span></pre></td><td class="code"><pre><span class="line"> <span class="keyword">if</span> (childView == <span class="keyword">null</span>) &#123; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">12</span></pre></td><td class="code"><pre><span class="line"> childView = <span class="keyword">view</span>.findViewById(id); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">13</span></pre></td><td class="code"><pre><span class="line"> viewHolder.put(id, childView); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">14</span></pre></td><td class="code"><pre><span class="line"> &#125; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">15</span></pre></td><td class="code"><pre><span class="line"> <span class="keyword">return</span> (T) childView; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">16</span></pre></td><td class="code"><pre><span class="line"> &#125; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">17</span></pre></td><td class="code"><pre><span class="line">&#125;</span></pre></td></tr></table></figure>
<p>在getView里这样</p>
<figure class="highlight reasonml"><table><tr><td class="gutter"><pre><span class="line">1</span></pre></td><td class="code"><pre><span class="line">@Override </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">2</span></pre></td><td class="code"><pre><span class="line">public View get<span class="constructor">View(<span class="params">int</span> <span class="params">position</span>, View <span class="params">convertView</span>, ViewGroup <span class="params">parent</span>)</span> &#123; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">3</span></pre></td><td class="code"><pre><span class="line"></span></pre></td></tr><tr><td class="gutter"><pre><span class="line">4</span></pre></td><td class="code"><pre><span class="line"> <span class="keyword">if</span> (convertView<span class="operator"> == </span>null) &#123; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">5</span></pre></td><td class="code"><pre><span class="line"> convertView = <span class="module-access"><span class="module"><span class="identifier">LayoutInflater</span>.</span></span>from(context) </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">6</span></pre></td><td class="code"><pre><span class="line"> .inflate(<span class="module-access"><span class="module"><span class="identifier">R</span>.</span></span>layout.banana_phone, parent, <span class="literal">false</span>); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">7</span></pre></td><td class="code"><pre><span class="line"> &#125; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">8</span></pre></td><td class="code"><pre><span class="line"></span></pre></td></tr><tr><td class="gutter"><pre><span class="line">9</span></pre></td><td class="code"><pre><span class="line"> ImageView bananaView = <span class="module-access"><span class="module"><span class="identifier">ViewHolder</span>.</span></span>get(convertView, <span class="module-access"><span class="module"><span class="identifier">R</span>.</span></span>id.banana); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">10</span></pre></td><td class="code"><pre><span class="line"> TextView phoneView = <span class="module-access"><span class="module"><span class="identifier">ViewHolder</span>.</span></span>get(convertView, <span class="module-access"><span class="module"><span class="identifier">R</span>.</span></span>id.phone); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">11</span></pre></td><td class="code"><pre><span class="line"></span></pre></td></tr><tr><td class="gutter"><pre><span class="line">12</span></pre></td><td class="code"><pre><span class="line"> BananaPhone bananaPhone = get<span class="constructor">Item(<span class="params">position</span>)</span>; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">13</span></pre></td><td class="code"><pre><span class="line"> phoneView.set<span class="constructor">Text(<span class="params">bananaPhone</span>.<span class="params">getPhone</span>()</span>); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">14</span></pre></td><td class="code"><pre><span class="line"> bananaView.set<span class="constructor">ImageResource(<span class="params">bananaPhone</span>.<span class="params">getBanana</span>()</span>); </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">15</span></pre></td><td class="code"><pre><span class="line"></span></pre></td></tr><tr><td class="gutter"><pre><span class="line">16</span></pre></td><td class="code"><pre><span class="line"> return convertView; </span></pre></td></tr><tr><td class="gutter"><pre><span class="line">17</span></pre></td><td class="code"><pre><span class="line">&#125;</span></pre></td></tr></table></figure>
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