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<a class="post-title-link" href="/2022/11/10/kotlin/" itemprop="url">Kotlin基础</a></h1>
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<h4 id="Kotlin基础"><a href="#Kotlin基础" class="headerlink" title="Kotlin基础"></a>Kotlin基础</h4><hr>
<p><strong>在kotlin中，if是表达式，而不是语句</strong></p>
<figure class="highlight kotlin"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">fun</span> <span class="title">max</span><span class="params">(a: <span class="type">Int</span>, b: <span class="type">Int</span>)</span></span>: <span class="built_in">Int</span> {</div><div class="line"> <span class="keyword">return</span> <span class="keyword">if</span> (a > b) a <span class="keyword">else</span> b</div><div class="line">}</div></pre></td></tr></table></figure>
<p><strong>表达式函数体</strong></p>
<figure class="highlight kotlin"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">fun</span> <span class="title">max</span><span class="params">(a: <span class="type">Int</span>, b: <span class="type">Int</span>)</span></span>: <span class="built_in">Int</span> = <span class="keyword">if</span>(a > b) a <span class="keyword">else</span> b</div><div class="line"><span class="comment">//表达式函数体还可以省略返回值类型</span></div><div class="line"><span class="function"><span class="keyword">fun</span> <span class="title">max</span><span class="params">(a: <span class="type">Int</span>, b: <span class="type">Int</span>)</span></span> = <span class="keyword">if</span>(a > b) a <span class="keyword">else</span> b</div></pre></td></tr></table></figure>
<p><strong>字符串模版</strong></p>
<figure class="highlight kotlin"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">println(<span class="string">"Hello, <span class="subst">$name</span>!"</span>)</div></pre></td></tr></table></figure>
<p><strong>值对象 ，public是默认的可见性，可以省略</strong></p>
<figure class="highlight kotlin"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="class"><span class="keyword">class</span> <span class="title">Person</span></span>(<span class="keyword">val</span> name: String)</div></pre></td></tr></table></figure>
<p><strong>属性</strong></p>
<figure class="highlight kotlin"><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></pre></td><td class="code"><pre><div class="line"><span class="class"><span class="keyword">class</span> <span class="title">Person</span> </span>{</div><div class="line"> <span class="keyword">val</span> name: String, <span class="comment">//只读属性：一个字段和getter</span></div><div class="line"> <span class="keyword">var</span> isMarried: <span class="built_in">Boolean</span> <span class="comment">//可写属性，一个字段、getter、setter</span></div><div class="line">}</div></pre></td></tr></table></figure>
<p><strong>自定义访问器</strong></p>
<figure class="highlight kotlin"><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"><span class="class"><span class="keyword">class</span> <span class="title">Rectangle</span></span>(<span class="keyword">val</span> height: <span class="built_in">Int</span>, <span class="keyword">val</span> width: <span class="built_in">Int</span>) {</div><div class="line"> <span class="keyword">val</span> isSquare: <span class="built_in">Boolean</span></div><div class="line"> <span class="keyword">get</span>() {</div><div class="line"> <span class="keyword">return</span> height == width</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p><strong>枚举</strong></p>
<blockquote>
<p>枚举并不是值的列表，可以声明枚举的属性和方法，枚举常量和方法<code>；</code>隔开</p>
</blockquote>
<figure class="highlight kotlin"><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="keyword">enum</span> <span class="class"><span class="keyword">class</span> <span class="title">Color</span> </span>{</div><div class="line"> RED, ORANGE, YELLOW, BLUE</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">enum</span> <span class="class"><span class="keyword">class</span> <span class="title">Color</span></span>(<span class="keyword">val</span> r: <span class="built_in">Int</span>, <span class="keyword">val</span> g: <span class="built_in">Int</span>, <span class="keyword">val</span> b: <span class="built_in">Int</span>) {</div><div class="line"> RED(<span class="number">225</span>, <span class="number">0</span>,<span class="number">0</span>), ORANGE(<span class="number">255</span>, <span class="number">165</span>, <span class="number">0</span>), YELLOW(<span class="number">255</span>,<span class="number">255</span>,<span class="number">0</span>)</div><div class="line"> BLUE(<span class="number">0</span>,<span class="number">0</span>, <span class="number">255</span>);</div><div class="line"> </div><div class="line"> <span class="function"><span class="keyword">fun</span> <span class="title">rgb</span><span class="params">()</span></span> = (r * <span class="number">256</span> + g) * <span class="number">256</span> + b</div><div class="line">}</div></pre></td></tr></table></figure>
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<h1 id="干货：ANR日志分析全面解析"><a href="#干货：ANR日志分析全面解析" class="headerlink" title="干货：ANR日志分析全面解析"></a>干货：ANR日志分析全面解析</h1><h1 id="一、概述"><a href="#一、概述" class="headerlink" title="一、概述"></a>一、概述</h1><p>解决ANR一直是Android 开发者需要掌握的重要技巧，一般从三个方面着手。</p>
<blockquote>
<p>开发阶段：通过工具检查各个方法的耗时，卡顿情况，发现一处修改一处。</p>
<p>线上阶段：这个阶段主要依靠监控工具发现ANR并上报，比如matrix。</p>
<p>分析阶段：如果线上用户发生ANR，并且你获取了一份日志，这就涉及了本文要分享的内容——ANR日志分析技巧。</p>
</blockquote>
<h1 id="二、ANR产生机制"><a href="#二、ANR产生机制" class="headerlink" title="二、ANR产生机制"></a>二、ANR产生机制</h1><p>网上通俗的一段面试答题</p>
<blockquote>
<p>ANR——应用无响应，Activity是5秒，BroadCastReceiver是10秒，Service是20秒。</p>
</blockquote>
<p>这句话说的很笼统，要想深入分析定位ANR，需要知道更多知识点，一般来说，ANR按产生机制，分为4类：</p>
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<h1 id="Java-Annotation-Processor"><a href="#Java-Annotation-Processor" class="headerlink" title="Java Annotation Processor"></a>Java Annotation Processor</h1><p>本文介绍了如何自定义Java注解处理器及涉及到的相关知识，看完本文可以很轻松看懂并理解各大开源框架的注解处理器的应用。</p>
<p>关于自定义Java注解请查看<a href="https://yuweiguocn.github.io/java-annotation/" target="_blank" rel="external">自定义注解</a>。</p>
<blockquote>
<p>本文转载自<a href="https://yuweiguocn.github.io/java-annotation-processor/" target="_blank" rel="external">自定义Java注解处理器</a></p>
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<h2 id="基本实现"><a href="#基本实现" class="headerlink" title="基本实现"></a>基本实现</h2><p>实现一个自定义注解处理器需要有两个步骤，第一是实现Processor接口处理注解，第二是注册注解处理器。</p>
<h3 id="实现Processor接口"><a href="#实现Processor接口" class="headerlink" title="实现Processor接口"></a>实现Processor接口</h3><p>通过实现Processor接口可以自定义注解处理器，这里我们采用更简单的方法通过继承AbstractProcessor类实现自定义注解处理器。实现抽象方法process处理我们想要的功能。</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></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">CustomProcessor</span> <span class="keyword">extends</span> <span class="title">AbstractProcessor</span> </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">boolean</span> <span class="title">process</span><span class="params">(Set<? extends TypeElement> annotations, RoundEnvironment roundEnvironment)</span> </span>{</div><div class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
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<h3 id="EventBus-源码详解"><a href="#EventBus-源码详解" class="headerlink" title="EventBus 源码详解"></a>EventBus 源码详解</h3><p>我们知道，EventBus 在有消息被发送出来时，可以直接为我们回调该消息的所有监听方法，回调操作是通过反射 <code>method.invoke</code> 来实现的。那么 EventBus 在回调之前也必须先拿到所有的监听方法才行，这样才知道该消息类型对应什么监听方法以及对应多少监听方法</p>
<p>EventBus 获取监听方法的方式有两种：</p>
<ul>
<li>不配置注解处理器。在 subscriber 进行 register 时通过反射获取到，这种方式是在运行时实现的</li>
<li>配置注解处理器。预先解析监听方法到辅助文件中，在运行时就可以直接拿到所有的解析结果而不必依靠反射来实现，这种方式是在编译阶段实现的，相比第一种方式性能会高很多</li>
</ul>
<p>这里先介绍第一种方式，这种方式只需要导入如下依赖即可</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">implementation <span class="string">"org.greenrobot:eventbus:3.2.0"</span></div></pre></td></tr></table></figure>
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