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  <h1>轮询器/倒计时</h1>

<p>Net自带轮询器(计时器), 包含以下特性</p>
<ul>
<li>正计时</li>
<li>倒计时</li>
<li>指定次数</li>
<li>支持开始/停止/暂停/继续/重置/切换开关</li>
<li>仅页面显示时计时</li>
<li>页面销毁自动取消</li>
</ul>
<p><br></p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:3"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><input id="__tabbed_1_3" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">限制次数/间隔</label><label for="__tabbed_1_2">无限执行</label><label for="__tabbed_1_3">倒计时</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<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">interval</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Interval</span><span class="p">(</span><span class="m">100</span><span class="p">,</span><span class="w"> </span><span class="m">1</span><span class="p">,</span><span class="w"> </span><span class="n">TimeUnit</span><span class="p">.</span><span class="na">SECONDS</span><span class="p">).</span><span class="na">life</span><span class="p">(</span><span class="k">this</span><span class="p">)</span><span class="w"> </span><span class="c1">// 自定义计数器个数的轮询器</span>
</span></code></pre></div>
</div>
<div class="tabbed-block">
<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="w"> </span><span class="n">interval</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Interval</span><span class="p">(</span><span class="m">1</span><span class="p">,</span><span class="w"> </span><span class="n">TimeUnit</span><span class="p">.</span><span class="na">SECONDS</span><span class="p">)</span><span class="w"> </span><span class="c1">// 每秒回调一次, 不会自动结束</span>
</span></code></pre></div>
</div>
<div class="tabbed-block">
<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="c1">// 倒计时轮询器, 当[start]]比[end]值大, 且end不等于-1时, 即为倒计时</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="n">interval</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Interval</span><span class="p">(</span><span class="m">1</span><span class="p">,</span><span class="w"> </span><span class="m">1</span><span class="p">,</span><span class="w"> </span><span class="n">TimeUnit</span><span class="p">.</span><span class="na">SECONDS</span><span class="p">,</span><span class="w"> </span><span class="m">5</span><span class="p">).</span><span class="na">life</span><span class="p">(</span><span class="k">this</span><span class="p">)</span>
</span></code></pre></div>
</div>
</div>
</div>
<p>监听轮询器
<div class="language-kotlin 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="n">interval</span><span class="p">.</span><span class="na">subscribe</span><span class="w"> </span><span class="p">{</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="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="nb">it</span><span class="p">.</span><span class="na">toString</span><span class="p">()</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="p">}.</span><span class="na">finish</span><span class="w"> </span><span class="p">{</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="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="s">&quot;计时完成&quot;</span><span class="w"> </span><span class="c1">// 最后一位数时同时回调 subscribe/finish</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="p">}.</span><span class="na">start</span><span class="p">()</span>
</span></code></pre></div></p>
<table>
<thead>
<tr>
<th>Interval</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>start</td>
<td>开始轮询器</td>
</tr>
<tr>
<td>stop</td>
<td>停止</td>
</tr>
<tr>
<td>cancel</td>
<td>取消, 区别于stop, 此函数执行后并不会回调finish</td>
</tr>
<tr>
<td>pause</td>
<td>暂停</td>
</tr>
<tr>
<td>resume</td>
<td>继续</td>
</tr>
<tr>
<td>reset</td>
<td>重置</td>
</tr>
<tr>
<td>switch</td>
<td>切换开关</td>
</tr>
<tr>
<td>subscribe</td>
<td>每次计时都会执行该回调</td>
</tr>
<tr>
<td>finish</td>
<td>当计时器完成时执行该回调, 执行stop后也会回调</td>
</tr>
<tr>
<td>life</td>
<td>指定生命周期自动取消轮询器</td>
</tr>
<tr>
<td>onlyResumed</td>
<td>当界面不可见时暂停, 当界面可见时继续</td>
</tr>
</tbody>
</table>
<div class="admonition failure">
<p class="admonition-title">后台运行</p>
<p>由于系统限制, 本工具无法保证一直后台运行</p>
</div>


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