RecyclerView的加载显示多种布局

RecyclerView是对ListView的封装，所以ListView上能用的方法对RecyclerView同样适用，并且会更简单

在实际开发中，我们可能需要一个列表，显示多种布局，getItemViewType()方法完美解决了这个问题，在BaseAdapter中还有getViewTypeCount()这个方法。这里我们使用RecyclerView.Adapter。只用getItemViewType就可以了。

先来看这个方法
@Override
public int getItemViewType(int position) {
}
参数position代表RecyclerView的位置，而int型的返回值代表了布局的类型，我们可以用0,1,2…..来表示判断，例如：
@Override
public int getItemViewType(int position) {
if (position == 0){
return 0;
} else if (position == 1){
return 1;
} else {
return 2;
}
}
我们需要在
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
｝
方法中判断view的类型。该方法的第二个参数viewType就是getItemViewType返回值的类型，通过判断值0,1,2…..来根据不同类型加载显示不同的布局，例如

<code class="hljs cs has-numbering">@Override    <span class="hljs-keyword">public</span> ViewHolder <span class="hljs-title">onCreateViewHolder</span>(ViewGroup parent, <span class="hljs-keyword">int</span> viewType) {        View view = <span class="hljs-keyword">null</span>;        ViewHolder holder = <span class="hljs-keyword">null</span>;        <span class="hljs-keyword">switch</span> (viewType){            <span class="hljs-keyword">case</span> <span class="hljs-number">0</span>:                view = LayoutInflater.<span class="hljs-keyword">from</span>(mContext).inflate(android.R.layout.simple_list_item_1, parent, <span class="hljs-keyword">false</span>);                holder = <span class="hljs-keyword">new</span> ViewHolderOne(view);                <span class="hljs-keyword">break</span>;            <span class="hljs-keyword">case</span> <span class="hljs-number">1</span>:                view = LayoutInflater.<span class="hljs-keyword">from</span>(mContext).inflate(android.R.layout.simple_list_item_2, parent, <span class="hljs-keyword">false</span>);                holder = <span class="hljs-keyword">new</span> ViewHolderTwo(view);                <span class="hljs-keyword">break</span>;            <span class="hljs-keyword">case</span> <span class="hljs-number">2</span>:                view = LayoutInflater.<span class="hljs-keyword">from</span>(mContext).inflate(android.R.layout.simple_list_item_2, parent, <span class="hljs-keyword">false</span>);                holder = <span class="hljs-keyword">new</span> ViewHolderThree(view);                <span class="hljs-keyword">break</span>;        }        <span class="hljs-keyword">return</span> holder;    }</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li></ul>

最后在

<code class="hljs avrasm has-numbering">@Override    public void onBindViewHolder(final RecyclerView<span class="hljs-preprocessor">.ViewHolder</span> holder, int position) {        switch (getItemViewType(position)){            case <span class="hljs-number">0</span>:                final ViewHolderOne holderOne = (ViewHolderOne) holder<span class="hljs-comment">;</span>                holderOne<span class="hljs-preprocessor">.text</span>1<span class="hljs-preprocessor">.setText</span>(beans<span class="hljs-preprocessor">.get</span>(position)<span class="hljs-preprocessor">.getTxt</span>())<span class="hljs-comment">;</span>                <span class="hljs-keyword">break</span><span class="hljs-comment">;</span>            case <span class="hljs-number">1</span>:                ViewHolderTwo holderTwo = (ViewHolderTwo) holder<span class="hljs-comment">;</span>                holderTwo<span class="hljs-preprocessor">.text</span>1<span class="hljs-preprocessor">.setText</span>(beans<span class="hljs-preprocessor">.get</span>(position)<span class="hljs-preprocessor">.getTxt</span>())<span class="hljs-comment">;</span>                holderTwo<span class="hljs-preprocessor">.text</span>2<span class="hljs-preprocessor">.setText</span>(beans<span class="hljs-preprocessor">.get</span>(position)<span class="hljs-preprocessor">.getTxt</span>())<span class="hljs-comment">;</span>                <span class="hljs-keyword">break</span><span class="hljs-comment">;</span>            case <span class="hljs-number">2</span>:                ViewHolderThree holderTwo = (ViewHolderTwo) holder<span class="hljs-comment">;</span>                holderThree<span class="hljs-preprocessor">.text</span>1<span class="hljs-preprocessor">.setText</span>(beans<span class="hljs-preprocessor">.get</span>(position)<span class="hljs-preprocessor">.getTxt</span>())<span class="hljs-comment">;</span>                holderThree<span class="hljs-preprocessor">.text</span>2<span class="hljs-preprocessor">.setText</span>(beans<span class="hljs-preprocessor">.get</span>(position)<span class="hljs-preprocessor">.getTxt</span>())<span class="hljs-comment">;</span>                <span class="hljs-keyword">break</span><span class="hljs-comment">;</span>        }    }</code><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li></ul><div class="save_code tracking-ad" style="display: none;" data-mod="popu_249"><a target=_blank target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png" alt="" /></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li></ul>

在这里，我们要定义3个ViewHolder，我们的Adapter继承RecyclerView.Adapter就可以，以上就是列表显示多种布局的处理，灵活运用，举一反三。比如百度贴吧子评论的显示更多，就可以这样处理，通过控制getItemCount和getItemViewType来实现。
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