Android Tv开发 RecyclerView焦点控制及自动换行
<p align="center">Android Tv开发 RecyclerView<span style="font-family: 宋体">焦点控制及自动换行</span></p><p><span style="font-family: 宋体"> 最近开始接触</span>Android TV端开发，有好多不适应，尤其是对焦点的控制，这也是手机app和电视app最大的不同之处。RecyclerView<span style="font-family: 宋体">是个强大的控件，能代替</span>ListView<span style="font-family: 宋体">，</span>GridView<span style="font-family: 宋体">，</span><span style="font-family: 宋体">能实现瀑布流，还能实现横向</span>ListView<span style="font-family: 宋体">，</span><span style="font-family: 宋体">只需要一句代码就能使纵向的</span>ListView<span style="font-family: 宋体">变成横向的（主要实现就是布局管理器的选择上）。这里我要说的是</span>RecyclerView<span style="font-family: 宋体">的</span>item的焦点控制和RecyclerView<span style="font-family: 宋体">末尾自动换行。</span></p>
<p>一、RecyclerView<span style="font-family: 宋体">焦点控制</span></p>
<p> Android TV使用RecyclerView,用焦点控制item</p>
<p> <span style="font-family: 宋体">首先在</span>item的xml中的最外层添加android:focusable="true",该句是为RecycleView<span style="font-family: 宋体">的</span>item添加焦点属性，添加完属性后，在RecyclerView<span style="font-family: 宋体">的</span>adapter中的onBindViewHolder方法中添加该view（<span style="font-family: 宋体">设置过</span> android:focusable="true"的view<span style="font-family: 宋体">）的</span>setOnFocusChangeListener()方法，如下所示：</p>
<p class="pre">((MyHolder) holder).ll_commitphone.setOnFocusChangeListener(new View.OnFocusChangeListener(){<br> @Override<br> public void onFocusChange(View v, boolean hasFocus) {<br> if (hasFocus) {<br> ((MyHolder) holder).ll_commitphone.setBackgroundResource(R.drawable.<em>select_ture</em>);<br> } else {<br> ((MyHolder) holder).ll_commitphone.setBackgroundResource(R.drawable.<em>select_false</em>);<br> }<br> }<br>});</p>
<p> </p>
<p>二、RecyclerView<span style="font-family: 宋体">末尾自动换行</span></p>
<p> <span style="font-family: 宋体">由于</span>RecyclerView<span style="font-family: 宋体">的</span>item在焦点控制的时候不会自动换行，可设置强制换行，如下：</p>
<p class="pre">RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(DiagnosiserActivity.this,4);<br>diagnosisRV.addItemDecoration(new DividerGridItemDecoration(<br> DiagnosiserActivity.this));<br>diagnosisRV.setLayoutManager(mLayoutManager);</p>
<p class="pre"> </p>
<p><span style="font-family: 宋体">以上只是部分代码，欢迎下载</span>demo。</p>
<p>下载地址：https://download.csdn.net/download/qq_35702985/12882124</p>
<p> </p><br><br>
来源：https://www.cnblogs.com/dmrbell/p/13719529.html
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