Android实现腾讯新闻的新闻类别导航效果

发布时间：2020-09-13 02:50:05 来源：脚本之家阅读：253 作者：地中海伯爵栏目：移动开发

效果图如下所示：

1、在Adapter中加入如下代码

<pre ><span >private int </span><span >clickTemp </span>= -<span >1</span><span >;</span><span >//</span><span ><em>TODO </em></span><span ><em>被选择的</em></span><span ><em>item</em></span><span ><em>下标</em></span></pre><p></p> 
<pre ><span ><em>/** 
</em></span><span ><em> * </em></span><span ><em>TODO </em></span><span ><em>传入下标，设置被选择的</em></span><span ><em>item 
</em></span><span ><em> </em></span><span ><em>* 
</em></span><span ><em> * </em></span><span ><strong><em>@param </em></strong></span><span ><em>position 
</em></span><span ><em> </em></span><span ><em>*/ 
</em></span><span >public void </span><span >setSelection</span>(<span >int </span>position) { 
 <span >clickTemp </span>= position<span >; 
</span>}</pre> 
<br> 
<pre></pre>

2、在Adapter的getView方法中加入如下代码

<p></p> 
<p></p><pre name="code" class="java"><pre ><span >//</span><span ><em>TODO </em></span><span ><em>点击改变</em></span><span ><em>item</em></span><span ><em>底部控件状态 
</em></span><span >if </span>(<span >clickTemp </span>== position) {<span >//</span><span ><em>TODO </em></span><span ><em>选中的</em></span><span ><em>item</em></span><span ><em>显示底部控件 
</em></span><span ><em> </em></span>typeHolder.<span >item_gv_viewBottom</span>.setVisibility(View.<span ><em>VISIBLE</em></span>)<span >; 
</span>} <span >else </span>{<span >//</span><span ><em>TODO </em></span><span ><em>未选中的</em></span><span ><em>item</em></span><span ><em>隐藏底部控件 
</em></span><span ><em> </em></span>typeHolder.<span >item_gv_viewBottom</span>.setVisibility(View.<span ><em>INVISIBLE</em></span>)<span >; 
</span>}</pre><p></p> 
<pre></pre>

3、修改OnItemClickListener代码<br>

<pre name="code" class="java"><pre ><span ><em>/** 
</em></span><span ><em> * item</em></span><span ><em>点击事件 
</em></span><span ><em> </em></span><span ><em>*/ 
</em></span>AdapterView.OnItemClickListener <span >mItemClickListener </span>= <span >new </span>AdapterView.OnItemClickListener() { 
 <span >@Override 
</span><span > </span><span >public void </span><span >onItemClick</span>(AdapterView<?> parent<span >, </span>View view<span >, int </span>position<span >, long </span>id) { 
  <span >myGridViewAdapter</span>.setSelection(position)<span >;</span><span >//</span><span ><em>TODO </em></span><span ><em>传入当前点击</em></span><span ><em>item</em></span><span ><em>的下标 
</em></span><span ><em>  </em></span><span >myGridViewAdapter</span>.notifyDataSetChanged()<span >;</span><span >//</span><span ><em>TODO </em></span><span ><em>刷新</em></span><span ><em>Adapter 
</em></span><span ><em> </em></span>} 
}<span >;</span></pre> 
<pre></pre> 
<br> 
<br> 
<p></p> 
<p><br> 
<br> 
</p>  
</pre></pre>

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Android实现腾讯新闻的新闻类别导航效果

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