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Net


			
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    作用域
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      异步任务的作用域
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      网络请求的作用域
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      嵌套作用域
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    Https证书
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  <h1>作用域</h1>

<p>创建不同协程作用域可以实现不同的功能</p>
<div class="admonition success">
<p class="admonition-title">减少崩溃</p>
<p>Net所有作用域内抛出异常都会被捕获到, 可以防止应用崩溃 <br></p>
</div>
<h2 id="_1">异步任务的作用域<a class="headerlink" href="#_1" title="Permanent link">&para;</a></h2>
<p>可以捕捉异常的协程作用域, 用于构建普通异步任务</p>
<table>
<thead>
<tr>
<th>函数</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>scope</code></td>
<td>创建最基础的作用域</td>
</tr>
<tr>
<td><code>scopeLife</code></td>
<td>创建跟随生命周期自动取消的作用域</td>
</tr>
<tr>
<td><code>ViewModel.scopeLife</code></td>
<td>创建跟随ViewModel生命周期的作用域, <a href="view-model.html">如何在ViewModel创建作用域</a></td>
</tr>
</tbody>
</table>
<h2 id="_2">网络请求的作用域<a class="headerlink" href="#_2" title="Permanent link">&para;</a></h2>
<p>除异步任务外还适用于网络请求场景的作用域, 对比上面<code>异步任务的作用域</code>区别:</p>
<ol>
<li>发生错误自动吐司(可以自定义或者取消)</li>
<li>发生错误会触发全局错误处理<code>NetErrorHandler</code></li>
<li>具备一些特殊场景功能, 比如根据网络请求结果自动处理下拉刷新/上拉加载/缺省页/加载框的状态</li>
</ol>
<table>
<thead>
<tr>
<th>函数</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>scopeNet</code></td>
<td>创建自动处理网络错误的作用域</td>
</tr>
<tr>
<td><code>scopeNetLife</code></td>
<td>创建自动处理网络错误的作用域, 且包含跟随Activity或者Fragment生命周期</td>
</tr>
<tr>
<td><code>scopeDialog</code></td>
<td>创建自动加载对话框的作用域, 生命周期跟随对话框</td>
</tr>
<tr>
<td><code>ViewModel.scopeNetLife</code></td>
<td>创建跟随ViewModel生命周期的作用域, <a href="view-model.html">如何在ViewModel创建作用域</a></td>
</tr>
<tr>
<td><code>PageRefreshLayout.scope</code></td>
<td>创建跟随<a href="https://github.com/liangjingkanji/BRV">PageRefreshLayout</a>生命周期的作用域</td>
</tr>
<tr>
<td><code>StateLayout.scope</code></td>
<td>创建跟随<a href="https://github.com/liangjingkanji/BRV">StateLayout</a>生命周期的作用域</td>
</tr>
</tbody>
</table>
<div class="admonition failure">
<p class="admonition-title">区分函数接受者</p>
<p>优先跟随布局而非Activity生命周期, 所以PageRefreshLayout等onRefresh函数内请使用<code>scope</code></p>
</div>
<div class="admonition quote">
<p class="admonition-title">第三方库支持</p>
<p>PageRefreshLayout/StateLayout 属于第三方开源项目 <a href="https://github.com/liangjingkanji/BRV">BRV</a>
框架中的布局, 可用于支持<a href="auto-state.html">自动化缺省页/下拉刷新</a><br></p>
</div>
<p>如果想更了解协程使用方式,
可以阅读一篇文章: <a href="https://juejin.im/post/6844904037586829320">最全面的Kotlin协程: Coroutine/Channel/Flow 以及实际应用</a></p>
<h2 id="_3">嵌套作用域<a class="headerlink" href="#_3" title="Permanent link">&para;</a></h2>
<p>有时候可能面临内嵌<code>scopeXX</code>函数(嵌套作用域), 这时候生命周期如下</p>
<div class="language-kotlin 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">scopeNetLife</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="w">    </span><span class="kd">val</span><span class="w"> </span><span class="nv">task</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Post</span><span class="o">&lt;</span><span class="kt">String</span><span class="o">&gt;</span><span class="p">(</span><span class="s">&quot;path&quot;</span><span class="p">).</span><span class="na">await</span><span class="p">()</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w">    </span><span class="n">scopeNetLife</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="hll"><span class="w">        </span><span class="kd">val</span><span class="w"> </span><span class="nv">task</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Post</span><span class="o">&lt;</span><span class="kt">String</span><span class="o">&gt;</span><span class="p">(</span><span class="s">&quot;path/error&quot;</span><span class="p">).</span><span class="na">await</span><span class="p">()</span><span class="w"> </span><span class="c1">// 此时发生请求错误</span>
</span></span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w">    </span><span class="p">}.</span><span class="na">catch</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="w">        </span><span class="c1">// A</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w">    </span><span class="p">}</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="p">}.</span><span class="na">catch</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w">    </span><span class="c1">// B</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="p">}</span>
</span></code></pre></div>
<ul>
<li>错误将在<code>A</code>处可以获取到, 且不影响外部<code>scopeNetLife</code>的请求</li>
<li>两个<code>scopeNetLife</code>的异常抛出和捕获互不影响</li>
<li><code>scopeXX()</code>等函数同理</li>
</ul>
<h2 id="_4">子作用域<a class="headerlink" href="#_4" title="Permanent link">&para;</a></h2>
<div class="language-kotlin 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">scopeNet</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w">    </span><span class="kd">val</span><span class="w"> </span><span class="nv">await</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Post</span><span class="o">&lt;</span><span class="kt">String</span><span class="o">&gt;</span><span class="p">(</span><span class="s">&quot;path&quot;</span><span class="p">).</span><span class="na">await</span><span class="p">()</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w">    </span><span class="n">launch</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w">       </span><span class="kd">val</span><span class="w"> </span><span class="nv">task</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Post</span><span class="o">&lt;</span><span class="kt">String</span><span class="o">&gt;</span><span class="p">(</span><span class="s">&quot;path/error&quot;</span><span class="p">).</span><span class="na">await</span><span class="p">()</span><span class="w">  </span><span class="c1">// 此时发生请求错误</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w">    </span><span class="p">}.</span><span class="na">invokeOnCompletion</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="hll"><span class="w">        </span><span class="c1">// A</span>
</span></span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="w">    </span><span class="p">}</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="p">}.</span><span class="na">catch</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="hll"><span class="w">     </span><span class="c1">// B</span>
</span></span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="p">}</span>
</span></code></pre></div>
<ul>
<li>这种情况 先执行<code>A</code>然后执行<code>B</code>, 并且都能捕获异常.</li>
<li>同时<code>scopeNet</code>发生错误也会导致<code>launch</code>内的请求被取消, <code>launch</code>发生错误也会导致<code>scopeNet</code>发生错误</li>
</ul>


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