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RecyclerView下拉刷新上拉加载.html
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RecyclerView下拉刷新上拉加载.html
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<h3 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h3><p>作为<code>ListView</code>和<code>GridView</code>的替代者， <code>RecyclerView</code>以它的灵活性著称，而且有着更好更完善的缓存处理机制。但是在使用<code>RecyclerVew</code>的过程中有个很明显的问题：<code>RecyclerView</code>没有为开发者提供<code>addHeadView</code>和<code>addFooterView</code>两个接口，这就为<code>RecyclerView</code>的下拉刷新和上拉加载实现增加了难度，本文就为大家介绍<code>RecyclerView</code>的下拉刷新和上拉加载的实现方式。</p>
<a id="more"></a>
<h3 id="下拉刷新"><a href="#下拉刷新" class="headerlink" title="下拉刷新"></a>下拉刷新</h3><p>其实<code>RecyclerView</code>的下拉刷新使用<code>SwipeRefreshLayout</code>组件实现还是非常简单的。</p>
<p><code>SwipeRefreshLayout</code>也是<code>Android SDK</code>中为我们提供的一个布局容器类，它作为容器可以为它的子元素提供下拉刷新接口，而且使用方式也非常简单，我就直接上代码了<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="tag"><<span class="name">android.support.v4.widget.SwipeRefreshLayout</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/swipeRefreshLayout"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"wrap_content"</span>></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">android.support.v7.widget.RecyclerView</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/recyclerView"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"wrap_content"</span>></div><div class="line"> <span class="tag"></<span class="name">android.support.v7.widget.RecyclerView</span>></span></div><div class="line"></div><div class="line"><span class="tag"></<span class="name">android.support.v4.widget.SwipeRefreshLayout</span>></span></div></pre></td></tr></table></figure></p>
<p>这就是<code>RecyclerView</code>结合<code>SwipeRefreshLayout</code>实现下拉刷新的布局方式，非常简单吧，写完布局文件之后，当然还要处理刷新的逻辑<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line">mSwipeRefreshLayout.setOnRefreshListener(<span class="keyword">new</span> SwipeRefreshLayout.OnRefreshListener() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onRefresh</span><span class="params">()</span> </span>{</div><div class="line"> <span class="comment">//在此处实现刷新获取数据，然后更新RecyclerView的数据源即可</span></div><div class="line"> }</div><div class="line">});</div></pre></td></tr></table></figure></p>
<p>写完这两段代码之后，<code>RecyclerView</code>的下拉刷新就实现完成了，是不是很简单。不过还有个小小的问题需要注意下，那就是在刷新获取数据处理逻辑结束之后需要调用<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">mSwipeRefreshLayout.setRefreshing(<span class="keyword">false</span>);</div></pre></td></tr></table></figure></p>
<p>这个接口就是告诉<code>SwipRefreshLayout</code>刷新动作已经结束，刷新进度条可以不用再显示了，否则的话视图顶部的刷新进度条会一直存在，当然如果你手动调用<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">mSwipeRefreshLayout.setRefreshing(<span class="keyword">true</span>);</div></pre></td></tr></table></figure></p>
<p>这个接口的话，刷新进度条就会显示出来。</p>
<h3 id="上拉加载"><a href="#上拉加载" class="headerlink" title="上拉加载"></a>上拉加载</h3><p>由于<code>RecyclerView</code>中没有提供<code>addFooterView</code>接口，所以我们没有办法像<code>ListView</code>中那样直接添加一个<code>FooterView</code>作为上拉加载的视图。但是<code>RecyclerView.Adapter</code>中也提供了<code>public int getItemViewType(int position)</code>接口，我们可以为<code>RecyclerView.Adapter</code>指定两种<code>ViewType</code>，一个作为普通的<code>ItemViewType</code>用来显示普通数据视图，一个作为<code>FooterViewType</code>用来显示上拉加载视图，这样的话我们就需要在展示数据的基础上为<code>RecyclerView.Adapter</code>额外增加一条数据用来显示添加的<code>FooterView</code>，这个特定<code>Adapter</code>的实现逻辑如下：</p>
<ol>
<li><p>定义两个<code>ViewType</code>分表用来区分普通是数据视图和上拉加载视图</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> VIEW_TYPE_FOOTER = <span class="number">0</span>;</div><div class="line"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> VIEW_TYPE_ITEM = <span class="number">1</span>;</div></pre></td></tr></table></figure>
</li>
<li><p>重写<code>getItemCount()</code>方法，在原有数据的基础上增加一条数据用来显示<code>FooterView</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="meta">@Override</span></div><div class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getItemCount</span><span class="params">()</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">return</span> mList.size() + <span class="number">1</span>;<span class="comment">//在原有数据的基础增加一个数据用来显示FooterView</span></div><div class="line">}</div></pre></td></tr></table></figure>
</li>
<li><p>重写<code>getItemViewType(int position)</code>方法，用来判断当前加载显示何种视图</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"><span class="meta">@Override</span></div><div class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getItemViewType</span><span class="params">(<span class="keyword">int</span> position)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">if</span>(position + <span class="number">1</span> == getItemCount()) {<span class="comment">//最后一条数据显示FooterView</span></div><div class="line"> <span class="keyword">return</span> VIEW_TYPE_FOOTER;</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> VIEW_TYPE_ITEM;</div><div class="line">}</div></pre></td></tr></table></figure>
</li>
<li><p>在<code>onCreateViewHolder</code>方法中根据<code>viewType</code>初始化对应的视图</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div></pre></td><td class="code"><pre><div class="line"><span class="meta">@Override</span></div><div class="line"><span class="keyword">public</span> RecyclerView.<span class="function">ViewHolder <span class="title">onCreateViewHolder</span><span class="params">(ViewGroup parent, <span class="keyword">int</span> viewType)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">if</span>(viewType == VIEW_TYPE_FOOTER) {</div><div class="line"> <span class="keyword">return</span> onCreateFooterViewHolder(parent, viewType);</div><div class="line"> } <span class="keyword">else</span> <span class="keyword">if</span>(viewType == VIEW_TYPE_ITEM) {</div><div class="line"> <span class="keyword">return</span> onCreateItemViewHolder(parent, viewType);</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</div><div class="line">}</div></pre></td></tr></table></figure>
</li>
<li><p>在<code>onBindViewHolder</code>方法中根据<code>viewType</code>绑定显示对应的视图数据</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div></pre></td><td class="code"><pre><div class="line"><span class="meta">@Override</span></div><div class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onBindViewHolder</span><span class="params">(RecyclerView.ViewHolder holder, <span class="keyword">int</span> position)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">switch</span> (getItemViewType(position)) {</div><div class="line"> <span class="keyword">case</span> VIEW_TYPE_ITEM:</div><div class="line"> onBindItemViewHolder(holder, position);</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> <span class="keyword">case</span> VIEW_TYPE_FOOTER:</div><div class="line"> onBindFooterViewHolder(holder, position, mLoadStatus);</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> <span class="keyword">default</span>:</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
</li>
</ol>
<p>整个<code>Adapter</code>完整的代码如下：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div><div class="line">73</div><div class="line">74</div><div class="line">75</div><div class="line">76</div><div class="line">77</div><div class="line">78</div><div class="line">79</div><div class="line">80</div><div class="line">81</div><div class="line">82</div><div class="line">83</div><div class="line">84</div><div class="line">85</div><div class="line">86</div><div class="line">87</div><div class="line">88</div><div class="line">89</div><div class="line">90</div><div class="line">91</div><div class="line">92</div><div class="line">93</div><div class="line">94</div><div class="line">95</div><div class="line">96</div><div class="line">97</div><div class="line">98</div><div class="line">99</div><div class="line">100</div><div class="line">101</div><div class="line">102</div><div class="line">103</div><div class="line">104</div><div class="line">105</div><div class="line">106</div><div class="line">107</div><div class="line">108</div><div class="line">109</div><div class="line">110</div><div class="line">111</div><div class="line">112</div><div class="line">113</div><div class="line">114</div><div class="line">115</div><div class="line">116</div><div class="line">117</div><div class="line">118</div><div class="line">119</div><div class="line">120</div><div class="line">121</div><div class="line">122</div><div class="line">123</div><div class="line">124</div><div class="line">125</div><div class="line">126</div><div class="line">127</div><div class="line">128</div><div class="line">129</div><div class="line">130</div><div class="line">131</div><div class="line">132</div><div class="line">133</div><div class="line">134</div><div class="line">135</div><div class="line">136</div><div class="line">137</div><div class="line">138</div><div class="line">139</div><div class="line">140</div><div class="line">141</div><div class="line">142</div><div class="line">143</div><div class="line">144</div><div class="line">145</div><div class="line">146</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DemoAdapter</span> <span class="keyword">extends</span> <span class="title">RecyclerView</span>.<span class="title">Adapter</span><<span class="title">RecyclerView</span>.<span class="title">ViewHolder</span>> </span>{</div><div class="line"> <span class="keyword">private</span> LoadStatus mLoadStatus = LoadStatus.CLICK_LOAD_MORE;<span class="comment">//上拉加载的状态</span></div><div class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> VIEW_TYPE_FOOTER = <span class="number">0</span>;</div><div class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> VIEW_TYPE_ITEM = <span class="number">1</span>;</div><div class="line"> <span class="keyword">private</span> List<String> mList;</div><div class="line"> <span class="keyword">private</span> Context mContext;</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="title">DemoAdapter</span><span class="params">(Context context, List<String> list)</span> </span>{</div><div class="line"></div><div class="line"> mContext = context;</div><div class="line"> mList = list;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="keyword">public</span> RecyclerView.<span class="function">ViewHolder <span class="title">onCreateViewHolder</span><span class="params">(ViewGroup parent, <span class="keyword">int</span> viewType)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">if</span>(viewType == VIEW_TYPE_FOOTER) {</div><div class="line"> <span class="keyword">return</span> onCreateFooterViewHolder(parent, viewType);</div><div class="line"> } <span class="keyword">else</span> <span class="keyword">if</span>(viewType == VIEW_TYPE_ITEM) {</div><div class="line"> <span class="keyword">return</span> onCreateItemViewHolder(parent, viewType);</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onBindViewHolder</span><span class="params">(RecyclerView.ViewHolder holder, <span class="keyword">int</span> position)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">switch</span> (getItemViewType(position)) {</div><div class="line"> <span class="keyword">case</span> VIEW_TYPE_ITEM:</div><div class="line"> onBindItemViewHolder(holder, position);</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> <span class="keyword">case</span> VIEW_TYPE_FOOTER:</div><div class="line"> onBindFooterViewHolder(holder, position, mLoadStatus);</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> <span class="keyword">default</span>:</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> }</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keyword">public</span> RecyclerView.<span class="function">ViewHolder <span class="title">onCreateFooterViewHolder</span><span class="params">(ViewGroup parent, <span class="keyword">int</span> viewType)</span> </span>{</div><div class="line"></div><div class="line"> View view = View.inflate(mContext, R.layout.footer_layout, <span class="keyword">null</span>);</div><div class="line"> <span class="keyword">return</span> <span class="keyword">new</span> FooterViewHolder(view);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keyword">public</span> RecyclerView.<span class="function">ViewHolder <span class="title">onCreateItemViewHolder</span><span class="params">(ViewGroup parent, <span class="keyword">int</span> viewType)</span> </span>{</div><div class="line"></div><div class="line"> View view = View.inflate(mContext, R.layout.item_layout, <span class="keyword">null</span>);</div><div class="line"> <span class="keyword">return</span> <span class="keyword">new</span> ItemViewHolder(view);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onBindFooterViewHolder</span><span class="params">(RecyclerView.ViewHolder holder, <span class="keyword">int</span> position, LoadStatus loadStatus)</span> </span>{</div><div class="line"></div><div class="line"> FooterViewHolder viewHolder = (FooterViewHolder) holder;</div><div class="line"> <span class="keyword">switch</span> (loadStatus) {</div><div class="line"> <span class="keyword">case</span> CLICK_LOAD_MORE:</div><div class="line"> viewHolder.mLoadingLayout.setVisibility(View.GONE);</div><div class="line"> viewHolder.mClickLoad.setVisibility(View.VISIBLE);</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> <span class="keyword">case</span> LOADING_MORE:</div><div class="line"> viewHolder.mLoadingLayout.setVisibility(View.VISIBLE);</div><div class="line"> viewHolder.mClickLoad.setVisibility(View.GONE);</div><div class="line"> <span class="keyword">break</span>;</div><div class="line"> }</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onBindItemViewHolder</span><span class="params">(RecyclerView.ViewHolder holder, <span class="keyword">int</span> position)</span> </span>{</div><div class="line"></div><div class="line"> ItemViewHolder viewHolder = (ItemViewHolder) holder;</div><div class="line"> viewHolder.mTextView.setText(getItem(position));</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getItemCount</span><span class="params">()</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">return</span> mList.size() + <span class="number">1</span>;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getItem</span><span class="params">(<span class="keyword">int</span> position)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">return</span> mList.get(position);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">addAll</span><span class="params">(List<String> list)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">this</span>.mList.addAll(list);</div><div class="line"> notifyDataSetChanged();</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getItemViewType</span><span class="params">(<span class="keyword">int</span> position)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">if</span>(position + <span class="number">1</span> == getItemCount()) {<span class="comment">//最后一条为FooterView</span></div><div class="line"> <span class="keyword">return</span> VIEW_TYPE_FOOTER;</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> VIEW_TYPE_ITEM;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">reSetData</span><span class="params">(List<String> list)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">this</span>.mList = list;</div><div class="line"> notifyDataSetChanged();</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setLoadStatus</span><span class="params">(LoadStatus loadStatus)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">this</span>.mLoadStatus = loadStatus;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ItemViewHolder</span> <span class="keyword">extends</span> <span class="title">RecyclerView</span>.<span class="title">ViewHolder</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">public</span> TextView mTextView;</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="title">ItemViewHolder</span><span class="params">(View itemView)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">super</span>(itemView);</div><div class="line"> mTextView = (TextView) itemView.findViewById(R.id.textView);</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FooterViewHolder</span> <span class="keyword">extends</span> <span class="title">RecyclerView</span>.<span class="title">ViewHolder</span> </span>{</div><div class="line"> <span class="keyword">public</span> LinearLayout mLoadingLayout;</div><div class="line"> <span class="keyword">public</span> TextView mClickLoad;</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="title">FooterViewHolder</span><span class="params">(View itemView)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">super</span>(itemView);</div><div class="line"> mLoadingLayout = (LinearLayout) itemView.findViewById(R.id.loading);</div><div class="line"> mClickLoad = (TextView) itemView.findViewById(R.id.click_load_txt);</div><div class="line"> mClickLoad.setOnClickListener(<span class="keyword">new</span> View.OnClickListener() {<span class="comment">//添加点击加载更多监听</span></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onClick</span><span class="params">(View v)</span> </span>{</div><div class="line"></div><div class="line"> loadMore();</div><div class="line"> }</div><div class="line"> });</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">public</span> <span class="keyword">enum</span> LoadStatus {</div><div class="line"> </div><div class="line"> CLICK_LOAD_MORE,<span class="comment">//点击加载更多</span></div><div class="line"> LOADING_MORE<span class="comment">//正在加载更多</span></div><div class="line">}</div></pre></td></tr></table></figure></p>
<p><code>FooterView</code>的布局如下：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div></pre></td><td class="code"><pre><div class="line"><span class="tag"><<span class="name">RelativeLayout</span> <span class="attr">xmlns:android</span>=<span class="string">"http://schemas.android.com/apk/res/android"</span></span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"40dp"</span></div><div class="line"> <span class="attr">android:gravity</span>=<span class="string">"center_horizontal"</span></div><div class="line"> <span class="attr">android:orientation</span>=<span class="string">"horizontal"</span>></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">LinearLayout</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/loading"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:orientation</span>=<span class="string">"horizontal"</span>></div><div class="line"> <span class="tag"><<span class="name">ProgressBar</span></span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"wrap_content"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"match_parent"</span>/></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">TextView</span></span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"wrap_content"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:gravity</span>=<span class="string">"center_vertical"</span></div><div class="line"> <span class="attr">android:text</span>=<span class="string">"正在加载..."</span>/></div><div class="line"> <span class="tag"></<span class="name">LinearLayout</span>></span></div><div class="line"></div><div class="line"> <span class="tag"><<span class="name">TextView</span></span></div><div class="line"> <span class="attr">android:id</span>=<span class="string">"@+id/click_load_txt"</span></div><div class="line"> <span class="attr">android:layout_width</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:layout_height</span>=<span class="string">"match_parent"</span></div><div class="line"> <span class="attr">android:paddingTop</span>=<span class="string">"5dp"</span></div><div class="line"> <span class="attr">android:paddingBottom</span>=<span class="string">"5dp"</span></div><div class="line"> <span class="attr">android:text</span>=<span class="string">"点击加载更多"</span></div><div class="line"> <span class="attr">android:visibility</span>=<span class="string">"gone"</span>/></div><div class="line"></div><div class="line"><span class="tag"></<span class="name">RelativeLayout</span>></span></div></pre></td></tr></table></figure></p>
<ol>
<li>写完<code>Adapter</code>的<code>FooterView</code>视图适配之后，我们还有一个重要的步骤需要做，在哪里实现加载更多的逻辑处理</li>
</ol>
<p>其实<code>RecyclerView</code>也为我们提供了<code>mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() )</code>接口，这样我们就看一看通过这个接口来判断什么时候调用加载更多的实现接口，关键代码如下：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line">mRecyclerView.setOnScrollListener(<span class="keyword">new</span> RecyclerView.OnScrollListener() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onScrollStateChanged</span><span class="params">(RecyclerView recyclerView, <span class="keyword">int</span> newState)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">super</span>.onScrollStateChanged(recyclerView, newState);</div><div class="line"> <span class="keyword">if</span> (newState == RecyclerView.SCROLL_STATE_IDLE</div><div class="line"> && mLastVisibleItemPosition + <span class="number">1</span> == mAdapter.getItemCount()) {</div><div class="line"></div><div class="line"> loadMore();</div><div class="line"> }</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onScrolled</span><span class="params">(RecyclerView recyclerView, <span class="keyword">int</span> dx, <span class="keyword">int</span> dy)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">super</span>.onScrolled(recyclerView, dx, dy);</div><div class="line"> mLastVisibleItemPosition = mLayoutManager.findLastVisibleItemPosition();</div><div class="line"> }</div><div class="line">});</div></pre></td></tr></table></figure></p>
<p>整个<code>Demo</code>的<code>Activity</code>的实现如下：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div><div class="line">73</div><div class="line">74</div><div class="line">75</div><div class="line">76</div><div class="line">77</div><div class="line">78</div><div class="line">79</div><div class="line">80</div><div class="line">81</div><div class="line">82</div><div class="line">83</div><div class="line">84</div><div class="line">85</div><div class="line">86</div><div class="line">87</div><div class="line">88</div><div class="line">89</div><div class="line">90</div><div class="line">91</div><div class="line">92</div><div class="line">93</div><div class="line">94</div><div class="line">95</div><div class="line">96</div><div class="line">97</div><div class="line">98</div><div class="line">99</div><div class="line">100</div><div class="line">101</div><div class="line">102</div><div class="line">103</div><div class="line">104</div><div class="line">105</div><div class="line">106</div><div class="line">107</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MainActivity</span> <span class="keyword">extends</span> <span class="title">AppCompatActivity</span> </span>{</div><div class="line"> <span class="keyword">private</span> RecyclerView mRecyclerView;</div><div class="line"> <span class="keyword">private</span> SwipeRefreshLayout mSwipeRefreshLayout;</div><div class="line"> <span class="keyword">private</span> DemoAdapter mAdapter;</div><div class="line"> <span class="keyword">private</span> <span class="keyword">int</span> mLastVisibleItemPosition = <span class="number">0</span>;</div><div class="line"> <span class="keyword">private</span> LinearLayoutManager mLayoutManager;</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onCreate</span><span class="params">(Bundle savedInstanceState)</span> </span>{</div><div class="line"></div><div class="line"> <span class="keyword">super</span>.onCreate(savedInstanceState);</div><div class="line"> setContentView(R.layout.activity_main);</div><div class="line"> mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);</div><div class="line"> mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);</div><div class="line"></div><div class="line">mLayoutManager = <span class="keyword">new</span> LinearLayoutManager(<span class="keyword">this</span>);</div><div class="line"> mRecyclerView.setLayoutManager(mLayoutManager);</div><div class="line"> mRecyclerView.setItemAnimator(<span class="keyword">new</span> DefaultItemAnimator());</div><div class="line"> </div><div class="line"> mAdapter = <span class="keyword">new</span> DemoAdapter(<span class="keyword">this</span>, getData(<span class="string">"init"</span>));</div><div class="line"> mRecyclerView.setAdapter(mAdapter);</div><div class="line"> mSwipeRefreshLayout.setOnRefreshListener(<span class="keyword">new</span> SwipeRefreshLayout.OnRefreshListener() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onRefresh</span><span class="params">()</span> </span>{</div><div class="line"> </div><div class="line"> <span class="keyword">new</span> Thread() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</div><div class="line"> </div><div class="line"> <span class="keyword">try</span> {</div><div class="line"> Thread.sleep(<span class="number">3000</span>);</div><div class="line"> <span class="keyword">final</span> List<String> list = getData(<span class="string">"refresh"</span>);</div><div class="line"> runOnUiThread(<span class="keyword">new</span> Runnable() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</div><div class="line"> </div><div class="line"> mAdapter.reSetData(list);</div><div class="line"> mSwipeRefreshLayout.setRefreshing(<span class="keyword">false</span>);</div><div class="line"> }</div><div class="line"> });</div><div class="line"> } <span class="keyword">catch</span> (InterruptedException e) {</div><div class="line"> e.printStackTrace();</div><div class="line"> }</div><div class="line"> }</div><div class="line"> }.start();</div><div class="line"> }</div><div class="line"> });</div><div class="line"> </div><div class="line"> mRecyclerView.setOnScrollListener(<span class="keyword">new</span> RecyclerView.OnScrollListener() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onScrollStateChanged</span><span class="params">(RecyclerView recyclerView, <span class="keyword">int</span> newState)</span> </span>{</div><div class="line"> </div><div class="line"> <span class="keyword">super</span>.onScrollStateChanged(recyclerView, newState);</div><div class="line"> <span class="keyword">if</span> (newState == RecyclerView.SCROLL_STATE_IDLE</div><div class="line"> && mLastVisibleItemPosition + <span class="number">1</span> == mAdapter.getItemCount()) {</div><div class="line"> </div><div class="line"> loadMore();</div><div class="line"> }</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onScrolled</span><span class="params">(RecyclerView recyclerView, <span class="keyword">int</span> dx, <span class="keyword">int</span> dy)</span> </span>{</div><div class="line"> </div><div class="line"> <span class="keyword">super</span>.onScrolled(recyclerView, dx, dy);</div><div class="line"> mLastVisibleItemPosition = mLayoutManager.findLastVisibleItemPosition();</div><div class="line"> }</div><div class="line"> });</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">loadMore</span><span class="params">()</span> </span>{</div><div class="line"> </div><div class="line"> mAdapter.setLoadStatus(LoadStatus.LOADING_MORE);</div><div class="line"> <span class="keyword">new</span> Thread() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</div><div class="line"> </div><div class="line"> <span class="keyword">try</span> {</div><div class="line"> Thread.sleep(<span class="number">3000</span>);</div><div class="line"> <span class="keyword">final</span> List<String> list = getData(<span class="string">"load more"</span>);</div><div class="line"> runOnUiThread(<span class="keyword">new</span> Runnable() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>{</div><div class="line"> </div><div class="line"> mAdapter.addAll(list);</div><div class="line"> mAdapter.setLoadStatus(LoadStatus.CLICK_LOAD_MORE);</div><div class="line"> }</div><div class="line"> });</div><div class="line"> } <span class="keyword">catch</span> (InterruptedException e) {</div><div class="line"> e.printStackTrace();</div><div class="line"> }</div><div class="line"> }</div><div class="line"> }.start();</div><div class="line"> }</div><div class="line"> </div><div class="line"> <span class="function"><span class="keyword">public</span> List<String> <span class="title">getData</span><span class="params">(String flag)</span> </span>{</div><div class="line"> </div><div class="line"> <span class="keyword">int</span> idx = <span class="number">1</span>;</div><div class="line"> <span class="keyword">if</span>(mAdapter != <span class="keyword">null</span>) {</div><div class="line"> idx = mAdapter.getItemCount();</div><div class="line"> }</div><div class="line"> List<String> list = <span class="keyword">new</span> ArrayList<>(<span class="number">10</span>);</div><div class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">0</span>; i < <span class="number">10</span>; i++) {</div><div class="line"> list.add(flag + <span class="string">":"</span> + (idx + i));</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> list;</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>以上就是我针对<code>RecyclerView</code>的下拉刷新上拉加载的实现方式。</p>
<hr>
<p>原创文章，本文采用<a href="https://creativecommons.org/licenses/by/2.5/cn/" target="_blank" rel="external">知识共享署名 2.5(中国大陆许可协议)</a>进行许可，欢迎转载，但转载请注明来自<a href="ittiger.cn">ittiger.cn</a>，并保证转载后文章内容的完整性。本人(laohu)保留所有版权相关权利。</p>
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