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  <h1>自动缺省页</h1>

<div class="admonition success">
<p class="admonition-title">模块化依赖</p>
<p>如果自己处理缺省页可跳过本章, Net可以仅仅作为简单的网络框架存在</p>
</div>
<p><br>
Net可依赖三方库实现自动缺省页, 以下二选一依赖</p>
<ol>
<li>依赖 <a href="https://github.com/liangjingkanji/StateLayout">StateLayout</a> <a href="https://jitpack.io/#liangjingkanji/StateLayout"><img src="https://jitpack.io/v/liangjingkanji/StateLayout.svg"/></a><br>
    <div class="language-groovy highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="n">implementation</span><span class="w"> </span><span class="s1">&#39;com.github.liangjingkanji:StateLayout:+&#39;</span><span class="w"> </span><span class="c1">// 使用固定版本号替换+符号</span>
</span></code></pre></div></li>
<li>依赖 <a href="https://github.com/liangjingkanji/BRV">BRV</a> (因为BRV包含StateLayout) <a href="https://jitpack.io/#liangjingkanji/BRV"><img src="https://jitpack.io/v/liangjingkanji/BRV.svg"/></a><br>
    <div class="language-groovy highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="n">implementation</span><span class="w"> </span><span class="s1">&#39;com.github.liangjingkanji:BRV:+&#39;</span><span class="w"> </span><span class="c1">// 使用固定版本号替换+符号</span>
</span></code></pre></div></li>
</ol>
<h2 id="_1">初始化<a class="headerlink" href="#_1" title="Permanent link">&para;</a></h2>
<p>在Application中初始化缺省页</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="n">StateConfig</span><span class="p">.</span><span class="na">apply</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="w">    </span><span class="n">emptyLayout</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">R</span><span class="p">.</span><span class="na">layout</span><span class="p">.</span><span class="na">layout_empty</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w">    </span><span class="n">loadingLayout</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">R</span><span class="p">.</span><span class="na">layout</span><span class="p">.</span><span class="na">layout_loading</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w">    </span><span class="n">errorLayout</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">R</span><span class="p">.</span><span class="na">layout</span><span class="p">.</span><span class="na">layout_error</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="p">}</span>
</span></code></pre></div>
<h2 id="_2">创建<a class="headerlink" href="#_2" title="Permanent link">&para;</a></h2>
<p>使用<code>StateLayout</code>包裹的内容即<code>内容</code>(content)</p>
<div class="language-xml highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="nt">&lt;com.drake.statelayout.StateLayout</span><span class="w"> </span><span class="na">xmlns:android=</span><span class="s">&quot;http://schemas.android.com/apk/res/android&quot;</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="w">    </span><span class="na">xmlns:tools=</span><span class="s">&quot;http://schemas.android.com/tools&quot;</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="w">    </span><span class="na">android:layout_width=</span><span class="s">&quot;match_parent&quot;</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="w">    </span><span class="na">android:id=</span><span class="s">&quot;@+id/state&quot;</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w">    </span><span class="na">android:layout_height=</span><span class="s">&quot;match_parent&quot;</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="w">    </span><span class="na">tools:context=</span><span class="s">&quot;.ui.fragment.StateLayoutFragment&quot;</span><span class="nt">&gt;</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w">    </span><span class="nt">&lt;TextView</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="w">        </span><span class="na">android:id=</span><span class="s">&quot;@+id/tv&quot;</span>
</span><span id="__span-3-10"><a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="w">        </span><span class="na">android:padding=</span><span class="s">&quot;32dp&quot;</span>
</span><span id="__span-3-11"><a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="w">        </span><span class="na">android:textStyle=</span><span class="s">&quot;bold&quot;</span>
</span><span id="__span-3-12"><a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="w">        </span><span class="na">android:layout_width=</span><span class="s">&quot;match_parent&quot;</span>
</span><span id="__span-3-13"><a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="w">        </span><span class="na">android:layout_height=</span><span class="s">&quot;match_parent&quot;</span>
</span><span id="__span-3-14"><a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="w">        </span><span class="na">android:text=</span><span class="s">&quot;内容&quot;</span><span class="w"> </span><span class="nt">/&gt;</span>
</span><span id="__span-3-15"><a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a>
</span><span id="__span-3-16"><a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a><span class="nt">&lt;/com.drake.statelayout.StateLayout&gt;</span>
</span></code></pre></div>
<h2 id="_3">网络请求<a class="headerlink" href="#_3" title="Permanent link">&para;</a></h2>
<ol>
<li>请求开始, 显示<code>加载中</code>缺省页</li>
<li>请求成功, 显示<code>内容</code>缺省页</li>
<li>请求失败,  显示<code>错误</code>缺省页</li>
</ol>
<p><div class="language-kotlin highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="n">state</span><span class="p">.</span><span class="na">onRefresh</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="hll"><span class="w">    </span><span class="n">scope</span><span class="w"> </span><span class="p">{</span>
</span></span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="w">        </span><span class="n">tv</span><span class="p">.</span><span class="na">text</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Get</span><span class="o">&lt;</span><span class="kt">String</span><span class="o">&gt;</span><span class="p">(</span><span class="n">Api</span><span class="p">.</span><span class="na">PATH</span><span class="p">).</span><span class="na">await</span><span class="p">()</span>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="w">    </span><span class="p">}</span>
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="p">}.</span><span class="na">showLoading</span><span class="p">()</span>
</span></code></pre></div>
<br></p>
<h2 id="_4">生命周期<a class="headerlink" href="#_4" title="Permanent link">&para;</a></h2>
<table>
<thead>
<tr>
<th>生命周期</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>开始</td>
<td><code>showLoading</code>触发<code>onRefresh</code>, 开始请求</td>
</tr>
<tr>
<td>结束</td>
<td>缺省页被销毁, 请求自动取消</td>
</tr>
</tbody>
</table>


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