Android中关于Handle的用法和分析

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            <h1 class="csdn_top">Android中关于Handle的用法和分析</h1>
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                    <span class="time">2016年02月28日 15:40:50</span>
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<p><span style="font-size:24px">Handler</span></p>
<p><span style="font-size:18px"><strong><span style="font-size:24px">1.作用：</span></strong></span></p>
<p><span style="font-size:18px">（1）.&nbsp;结合<span style="font-family:Calibri">Thread</span><span style="font-family:宋体">实现连网读取数据，读取数据后更新页面,即<span style="font-family:宋体">从子线程给主线程提供一个消息报告的作用</span></span></span></p>
<p>因此主线程中一旦接收到此消息报告，即可更新页面。</p>
<p><span style="font-size:18px">（2）.&nbsp;指定一系列的动作排队执行</span></p>
<p><strong><span style="font-size:18px"><span style="font-size:24px">2.实现步骤：</span></span></strong></p>
<p><span style="font-size:18px">1.&nbsp;创建<span style="font-family:Calibri">Handler</span></span><span style="font-family:宋体"><span style="font-size:14px"><span style="font-size:18px">对象</span></span></span></p>
<p><span style="font-size:14px; color:#FF0000">注：在<span style="font-family:Calibri">new</span><span style="font-family:宋体">对象的结尾添加</span><span style="font-family:Calibri">{}</span><span style="font-family:宋体">，并重写</span><span style="font-family:Calibri">handleMessage</span></span><span style="font-family:宋体"><span style="color:#FF0000"><span style="font-size:14px">方法</span></span></span></p>
<p><span style="font-size:18px">2.&nbsp;通过<span style="font-family:Calibri">handler</span></span><span style="font-family:宋体"><span style="font-size:14px"><span style="font-size:18px">发送消息</span></span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2.1在发送消息时可选择发送空消息或者非空消息</span></p>
<p><strong><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 非空消息与空消息的区别：</span></strong></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; 空消息中只能携带一个<span style="font-family:Calibri">int</span><span style="font-family:宋体">类型的数字</span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; 非空消息中除了可以携带<span style="font-family:Calibri">int</span></span><span style="font-family:宋体"><span style="font-size:14px">类型的数字外，还可携带一些其他数据</span></span></p>
<p><strong><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 发送消息时可选择的方法：</span></strong></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; a)&nbsp;sendEmptyMessage<span style="font-family:宋体">（</span><span style="font-family:Calibri">int&nbsp;what</span><span style="font-family:宋体">）发送空消息</span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 参数作用：给当前发送的消息匹配一个唯一标识 由于所有通过<span style="font-family:Calibri">handler</span><span style="font-family:宋体">对象发送的消息，最后都会到同一个</span><span style="font-family:Calibri"> &nbsp; &nbsp; &nbsp; &nbsp;handleMessage</span><span style="font-family:宋体">方法中进行接收</span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 因此，为了<span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法中区分当前接收的消息是哪一个条</span>通过<span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">what</span><span style="font-family:宋体">属性进行判断</span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b)&nbsp;sendMessage&nbsp;(Message&nbsp;msg)&nbsp;&nbsp;&nbsp;</span><span style="font-family:宋体"><span style="font-size:14px">发送非空消息</span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2.2发送步骤：</span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1)<span style="font-family:宋体">封装要发送的</span><span style="font-family:Calibri">Message</span><span style="font-family:宋体">对象</span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 初始化方式有以下<span style="font-family:Calibri">3</span><span style="font-family:宋体">种：</span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Message&nbsp;msg&nbsp;=&nbsp;new&nbsp;Message();</span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Message&nbsp;msg&nbsp;=&nbsp;Message.obtain();</span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Message&nbsp;msg&nbsp;=&nbsp;handler.obtainMessage();</span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 推荐选择后两种方式的任意一种进行初始化，不推荐使用<span style="font-family:Calibri">new&nbsp;Message</span><span style="font-family:宋体">方法获取对象</span></span></p>
<p><span style="font-size:14px">原因：后两种方式在创建对象时会去判断内存中是否有能够直接使用的<span style="font-family:Calibri">Message</span><span style="font-family:宋体">对象，如果有，直接拿来用，</span></span></p>
<p><span style="font-size:14px">如果没有，再新建对象使用。通过后两种方式可以减少创建对象的个数，在内存方面比较优化</span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2)&nbsp;<span style="font-family:宋体">通过调用</span><span style="font-family:Calibri">msg.what&nbsp;=&nbsp;n</span><span style="font-family:宋体">（任意数字）给当前封装的</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">what</span><span style="font-family:宋体">属性赋值</span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3)&nbsp;<span style="font-family:宋体">向</span><span style="font-family:Calibri">Message</span><span style="font-family:宋体">对象中添加要携带的数据</span></span></p>
<p><span style="font-size:14px"><strong><span id="transmark"></span>可选的添加数据的方式：</strong></span></p>
<p><span style="font-size:14px">（1）&nbsp;msg.obj&nbsp;=&nbsp;Object(<span style="font-family:宋体">任意类型的对象</span><span style="font-family:Calibri">)&nbsp;&nbsp;&nbsp;</span><span style="font-family:宋体">给</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">obj</span><span style="font-family:宋体">属性赋值</span></span></p>
<p><span style="font-size:14px">（2）&nbsp;通过<span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">arg1</span><span style="font-family:宋体">和</span><span style="font-family:Calibri">arg2</span><span style="font-family:宋体">属性携带数据，添加数据的方式与</span><span style="font-family:Calibri">obj</span><span style="font-family:宋体">属性相同</span>msg.<span style="font-family:宋体">属性名&nbsp;</span><span style="font-family:Calibri">=&nbsp;&nbsp;</span><span style="font-family:宋体">赋值；</span></span></p>
<p><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 此两条属性只能携带<span style="font-family:Calibri">int</span><span style="font-family:宋体">类型的数据</span></span></p>
<p><span style="font-size:14px">（3）&nbsp;通过<span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">setData(Bundle&nbsp;args)</span><span style="font-family:宋体">方法携带数据</span></span></p>
<p><span style="font-size:14px"><strong>对应的取出数据的方式：</strong></span></p>
<p><span style="font-size:14px">在<span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法中，通过参数</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象</span></span></p>
<p><span style="font-size:14px">（1）&nbsp;Object&nbsp;o&nbsp;=&nbsp;msg.obj;&nbsp;&nbsp;<span style="font-family:宋体">取出</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">obj</span><span style="font-family:宋体">属性的值</span></span></p>
<p><span style="font-size:14px">注：接收该属性的对象可以按需求写成任意类型</span></p>
<p><span style="font-size:14px">如，接收的是一个<span style="font-family:Calibri">Bitmap</span><span style="font-family:宋体">图片数据</span></span></p>
<p><span style="font-size:14px">则可：<span style="font-family:Calibri">Bitmap&nbsp;o=&nbsp;</span><span style="font-family:宋体">（</span><span style="font-family:Calibri">Bitmap</span><span style="font-family:宋体">）</span><span style="font-family:Calibri">msg.obj;</span></span></p>
<p><span style="font-size:14px">（2）&nbsp;通过<span style="font-family:Calibri">msg.arg1</span><span style="font-family:宋体">进行取值即可</span></span></p>
<p><span style="font-size:14px">（3）&nbsp;通过<span style="font-family:Calibri">msg.getData&nbsp;</span><span style="font-family:宋体">先取出传递过来的</span><span style="font-family:Calibri">Bundle</span><span style="font-family:宋体">对象，然后通过</span><span style="font-family:Calibri">Bundle</span>对象调用<span style="font-family:Calibri">get</span><span style="font-family:宋体">方法根据</span><span style="font-family:Calibri">key</span><span style="font-family:宋体">取出对应的</span></span><span style="font-family:Calibri"><span style="font-size:14px">value</span></span></p>
<p><span style="font-size:14px"><strong>应该在什么情况下选择哪种方式携带数据？</strong></span></p>
<p><span style="font-size:14px">1.&nbsp;如果要携带的数据的类型和个数不超出<span style="font-family:Calibri">2</span><span style="font-family:宋体">个</span><span style="font-family:Calibri">int</span><span style="font-family:宋体">和</span><span style="font-family:Calibri">1</span><span style="font-family:宋体">个任意类型时，推荐直接使用对应的属性进行携带</span></span></p>
<p><span style="font-size:14px">2.&nbsp;如果要携带的数据的类型或者个数超出上述的限制，那么使用<span style="font-family:Calibri">setData</span><span style="font-family:宋体">方法进行携带</span></span></p>
<p><span style="font-size:14px">3.&nbsp;在<span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">中接收通过</span><span style="font-family:Calibri">sendEmptyMessage</span><span style="font-family:宋体">或者通过</span><span style="font-family:Calibri">sendMessage</span><span style="font-family:宋体">方法发送过来的消息</span></span></p>
<p><span style="font-size:14px">4.&nbsp;通过<span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法中的参数</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象获取</span><span style="font-family:Calibri">msg.what</span></span><span style="font-family:宋体"><span style="font-size:14px">属性的值即可区分当前接收的是哪一个发送过来的消息</span></span></p>
<p><strong><span style="font-size:18px">使用<span style="font-family:Calibri">Handler</span></span></strong><span style="font-family:宋体"><strong><span style="font-size:18px">时的注意事项：</span></strong></span></p>
<p><span style="font-size:14px">1.&nbsp;handleMessage<span style="font-family:宋体">名称不要写错，参数列数不要修改</span></span></p>
<p><span style="font-size:14px">2.&nbsp;在初始化<span style="font-family:Calibri">Handler</span><span style="font-family:宋体">对象，重写</span><span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法的时候，注意不要写成以下格式：</span></span></p>
<p><span style="font-size:14px">3.&nbsp;在一个<span style="font-family:Calibri">Activity</span><span style="font-family:宋体">中支持创建多个</span><span style="font-family:Calibri">Handler</span><span style="font-family:宋体">对象，当发送消息后，由哪个</span><span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法进行消息的处理，取决于发送消息的对象是哪个</span><span style="font-family:Calibri">------</span><span style="font-family:宋体">哪个</span><span style="font-family:Calibri">handler</span><span style="font-family:宋体">对象发送的消息，就有哪个</span><span style="font-family:Calibri">handler</span><span style="font-family:宋体">对象进行消息的处理</span></span></p>
<p><span style="font-size:14px">4.&nbsp;handler<span style="font-family:宋体">对象的发送消息方法并不会阻塞主线程的运行，即</span>如果在发送消息的代码后方有其他代码，那么不会等到消息处理完后再后续代码，而是直接运行后续代码</span></p>
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                        原文来自：OSChina


今天新同事问了一些关于什么时候用全局变量，什么时候用self.赋值的问题，所以笔者在此说明一下。


何时使用self.在网上搜索或者论坛里的回复大多都是简简单单的说...
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                        众所周知，存储器主要分为只读存储器（ROM）、闪存（flash）、随机存储器（RAM）、光磁介质存储器。
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                        （来自：http://blog.163.com/shaochx@126/blog/static/202195182009111101932975/）


1.句柄是什么？
&nbsp;&nbsp;&nbsp;&nbsp;在windows...
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                        Handler是Android消息模型最重要的一个概念，它可以说是Android消息模型的核心，对于Looper、MessageQueue、Message 等概念一般在应用中很少使用。在Android...
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                        关于WM_NOTIFY的使用方法&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; 切记：此消息只发给它的父窗口，再要发给父窗口的父窗口或主框架窗口等...
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                        关于用研方法的心得　　现实工作中用户的需求会千奇百怪，再加上数据采集，业务部门的反馈，尝尝会让很多产品经理迷失在自己的世界里，而产品不可能大而全的满足所有用户的所有需求，这点虽然是老生常谈，但仍屡见不...
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                        关于JSP里JavaBean的用法分析:我们可以使用Scriptlet的方式:  / 
还可以用的方式//bean.HelloBean.java:
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public cl...
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                        <li class="time">2011-11-02 09:49</li>
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<div class="container clearfix">    <main>        <article>            <h1 class="csdn_top">Android中关于Handle的用法和分析</h1>            <div class="article_bar clearfix">                <div class="artical_tag">                    <span class="original">原创</span>                    <span class="time">2016年02月28日 15:40:50</span>                </div>                <ul class="right_bar">                    <li><button class="btn-noborder"><i class="icon iconfont icon-read"></i><span class="txt">586</span></button></li>                    <li><button class="btn-noborder but-comment-topicon"><i class="icon iconfont icon-pinglun"></i><span class="txt">0</span></button></li>                    <li><button class="btn-noborder btn-like"><i class="icon iconfont icon-xihuan-"></i><span class="txt">1</span></button></li>                    <!--<li><button class="btn-noborder"><i class="icon iconfont icon-dashang-"></i><span class="txt">0</span></button></li>-->                    <li class="edit" 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style="font-family:Calibri">Thread</span><span style="font-family:宋体">实现连网读取数据，读取数据后更新页面,即<span style="font-family:宋体">从子线程给主线程提供一个消息报告的作用</span></span></span></p><p>因此主线程中一旦接收到此消息报告，即可更新页面。</p><p><span style="font-size:18px">（2）. 指定一系列的动作排队执行</span></p><p><strong><span style="font-size:18px"><span style="font-size:24px">2.实现步骤：</span></span></strong></p><p><span style="font-size:18px">1. 创建<span style="font-family:Calibri">Handler</span></span><span style="font-family:宋体"><span style="font-size:14px"><span style="font-size:18px">对象</span></span></span></p><p><span style="font-size:14px; color:#FF0000">注：在<span style="font-family:Calibri">new</span><span style="font-family:宋体">对象的结尾添加</span><span style="font-family:Calibri">{}</span><span style="font-family:宋体">，并重写</span><span style="font-family:Calibri">handleMessage</span></span><span style="font-family:宋体"><span style="color:#FF0000"><span style="font-size:14px">方法</span></span></span></p><p><span style="font-size:18px">2. 通过<span style="font-family:Calibri">handler</span></span><span style="font-family:宋体"><span style="font-size:14px"><span style="font-size:18px">发送消息</span></span></span></p><p><span style="font-size:14px">      2.1在发送消息时可选择发送空消息或者非空消息</span></p><p><strong><span style="font-size:14px">            非空消息与空消息的区别：</span></strong></p><p><span style="font-size:14px">                   空消息中只能携带一个<span style="font-family:Calibri">int</span><span style="font-family:宋体">类型的数字</span></span></p><p><span style="font-size:14px">                  非空消息中除了可以携带<span style="font-family:Calibri">int</span></span><span style="font-family:宋体"><span style="font-size:14px">类型的数字外，还可携带一些其他数据</span></span></p><p><strong><span style="font-size:14px">            发送消息时可选择的方法：</span></strong></p><p><span style="font-size:14px">                     a) sendEmptyMessage<span style="font-family:宋体">（</span><span style="font-family:Calibri">int what</span><span style="font-family:宋体">）发送空消息</span></span></p><p><span style="font-size:14px">                        参数作用：给当前发送的消息匹配一个唯一标识 由于所有通过<span style="font-family:Calibri">handler</span><span style="font-family:宋体">对象发送的消息，最后都会到同一个</span><span style="font-family:Calibri">        handleMessage</span><span style="font-family:宋体">方法中进行接收</span></span></p><p><span style="font-size:14px">                        因此，为了<span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法中区分当前接收的消息是哪一个条</span>通过<span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">what</span><span style="font-family:宋体">属性进行判断</span></span></p><p><span style="font-size:14px">                     b) sendMessage (Message msg)   </span><span style="font-family:宋体"><span style="font-size:14px">发送非空消息</span></span></p><p><span style="font-size:14px">       2.2发送步骤：</span></p><p><span style="font-size:14px">                     1)<span style="font-family:宋体">封装要发送的</span><span style="font-family:Calibri">Message</span><span style="font-family:宋体">对象</span></span></p><p><span style="font-size:14px">                      初始化方式有以下<span style="font-family:Calibri">3</span><span style="font-family:宋体">种：</span></span></p><p><span style="font-size:14px">                        Message msg = new Message();</span></p><p><span style="font-size:14px">                        Message msg = Message.obtain();</span></p><p><span style="font-size:14px">                        Message msg = handler.obtainMessage();</span></p><p><span style="font-size:14px">                        推荐选择后两种方式的任意一种进行初始化，不推荐使用<span style="font-family:Calibri">new Message</span><span style="font-family:宋体">方法获取对象</span></span></p><p><span style="font-size:14px">原因：后两种方式在创建对象时会去判断内存中是否有能够直接使用的<span style="font-family:Calibri">Message</span><span style="font-family:宋体">对象，如果有，直接拿来用，</span></span></p><p><span style="font-size:14px">如果没有，再新建对象使用。通过后两种方式可以减少创建对象的个数，在内存方面比较优化</span></p><p><span style="font-size:14px">                      2) <span style="font-family:宋体">通过调用</span><span style="font-family:Calibri">msg.what = n</span><span style="font-family:宋体">（任意数字）给当前封装的</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">what</span><span style="font-family:宋体">属性赋值</span></span></p><p><span style="font-size:14px">                      3) <span style="font-family:宋体">向</span><span style="font-family:Calibri">Message</span><span style="font-family:宋体">对象中添加要携带的数据</span></span></p><p><span style="font-size:14px"><strong><span id="transmark"></span>可选的添加数据的方式：</strong></span></p><p><span style="font-size:14px">（1） msg.obj = Object(<span style="font-family:宋体">任意类型的对象</span><span style="font-family:Calibri">)   </span><span style="font-family:宋体">给</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">obj</span><span style="font-family:宋体">属性赋值</span></span></p><p><span style="font-size:14px">（2） 通过<span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">arg1</span><span style="font-family:宋体">和</span><span style="font-family:Calibri">arg2</span><span style="font-family:宋体">属性携带数据，添加数据的方式与</span><span style="font-family:Calibri">obj</span><span style="font-family:宋体">属性相同</span>msg.<span style="font-family:宋体">属性名 </span><span style="font-family:Calibri">=  </span><span style="font-family:宋体">赋值；</span></span></p><p><span style="font-size:14px">           此两条属性只能携带<span style="font-family:Calibri">int</span><span style="font-family:宋体">类型的数据</span></span></p><p><span style="font-size:14px">（3） 通过<span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">setData(Bundle args)</span><span style="font-family:宋体">方法携带数据</span></span></p><p><span style="font-size:14px"><strong>对应的取出数据的方式：</strong></span></p><p><span style="font-size:14px">在<span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法中，通过参数</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象</span></span></p><p><span style="font-size:14px">（1） Object o = msg.obj;  <span style="font-family:宋体">取出</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象的</span><span style="font-family:Calibri">obj</span><span style="font-family:宋体">属性的值</span></span></p><p><span style="font-size:14px">注：接收该属性的对象可以按需求写成任意类型</span></p><p><span style="font-size:14px">如，接收的是一个<span style="font-family:Calibri">Bitmap</span><span style="font-family:宋体">图片数据</span></span></p><p><span style="font-size:14px">则可：<span style="font-family:Calibri">Bitmap o= </span><span style="font-family:宋体">（</span><span style="font-family:Calibri">Bitmap</span><span style="font-family:宋体">）</span><span style="font-family:Calibri">msg.obj;</span></span></p><p><span style="font-size:14px">（2） 通过<span style="font-family:Calibri">msg.arg1</span><span style="font-family:宋体">进行取值即可</span></span></p><p><span style="font-size:14px">（3） 通过<span style="font-family:Calibri">msg.getData </span><span style="font-family:宋体">先取出传递过来的</span><span style="font-family:Calibri">Bundle</span><span style="font-family:宋体">对象，然后通过</span><span style="font-family:Calibri">Bundle</span>对象调用<span style="font-family:Calibri">get</span><span style="font-family:宋体">方法根据</span><span style="font-family:Calibri">key</span><span style="font-family:宋体">取出对应的</span></span><span style="font-family:Calibri"><span style="font-size:14px">value</span></span></p><p><span style="font-size:14px"><strong>应该在什么情况下选择哪种方式携带数据？</strong></span></p><p><span style="font-size:14px">1. 如果要携带的数据的类型和个数不超出<span style="font-family:Calibri">2</span><span style="font-family:宋体">个</span><span style="font-family:Calibri">int</span><span style="font-family:宋体">和</span><span style="font-family:Calibri">1</span><span style="font-family:宋体">个任意类型时，推荐直接使用对应的属性进行携带</span></span></p><p><span style="font-size:14px">2. 如果要携带的数据的类型或者个数超出上述的限制，那么使用<span style="font-family:Calibri">setData</span><span style="font-family:宋体">方法进行携带</span></span></p><p><span style="font-size:14px">3. 在<span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">中接收通过</span><span style="font-family:Calibri">sendEmptyMessage</span><span style="font-family:宋体">或者通过</span><span style="font-family:Calibri">sendMessage</span><span style="font-family:宋体">方法发送过来的消息</span></span></p><p><span style="font-size:14px">4. 通过<span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法中的参数</span><span style="font-family:Calibri">msg</span><span style="font-family:宋体">对象获取</span><span style="font-family:Calibri">msg.what</span></span><span style="font-family:宋体"><span style="font-size:14px">属性的值即可区分当前接收的是哪一个发送过来的消息</span></span></p><p><strong><span style="font-size:18px">使用<span style="font-family:Calibri">Handler</span></span></strong><span style="font-family:宋体"><strong><span style="font-size:18px">时的注意事项：</span></strong></span></p><p><span style="font-size:14px">1. handleMessage<span style="font-family:宋体">名称不要写错，参数列数不要修改</span></span></p><p><span style="font-size:14px">2. 在初始化<span style="font-family:Calibri">Handler</span><span style="font-family:宋体">对象，重写</span><span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法的时候，注意不要写成以下格式：</span></span></p><p><span style="font-size:14px">3. 在一个<span style="font-family:Calibri">Activity</span><span style="font-family:宋体">中支持创建多个</span><span style="font-family:Calibri">Handler</span><span style="font-family:宋体">对象，当发送消息后，由哪个</span><span style="font-family:Calibri">handleMessage</span><span style="font-family:宋体">方法进行消息的处理，取决于发送消息的对象是哪个</span><span style="font-family:Calibri">------</span><span style="font-family:宋体">哪个</span><span style="font-family:Calibri">handler</span><span style="font-family:宋体">对象发送的消息，就有哪个</span><span style="font-family:Calibri">handler</span><span style="font-family:宋体">对象进行消息的处理</span></span></p><p><span style="font-size:14px">4. handler<span style="font-family:宋体">对象的发送消息方法并不会阻塞主线程的运行，即</span>如果在发送消息的代码后方有其他代码，那么不会等到消息处理完后再后续代码，而是直接运行后续代码</span></p><link rel="stylesheet" href="http://static.blog.csdn.net/public/res-min/markdown_views.css?v=2.0">            </div>        </article>        <div class="readall_box csdn-tracking-statistics readall_box_nobg" data-mod="popu_376" style="display: none;">            <a class="btn btn-large btn-gray-fred read_more_btn" target="_self">阅读全文</a>        </div>        <div class="article_copyright">            版权声明：本文为博主原创文章，未经博主允许不得转载。            <span class="r_ico"><i class="icon iconfont icon-jubao"></i><span class="txt" id="reportBtn">举报</span></span>        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href="http://edu.csdn.net/huiyiCourse/series_detail/61?utm_source=blog10" target="_blank">如何成为一名机器学习的大咖？</a></h2>  <div class="summary">对于机器学习，很多人的观点是：机器学习技术是今后所有技术人员都绕不过的一个门槛。 那么，普通程序员该学习机器学作为一名对机器学习心有向往的程序员，我该以什么样的姿势开始呢？</div>                     </div>                </dd>            </dl>                        <dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post">                <dd>                    <h2><a href="/xiang_pao/article/details/20949199" target="_blank" strategy="BlogCommendFromCsdn_2">关于Android Handle的用法</a></h2>                    <div class="summary">                        一、Handler的定义:      主要接受子线程发送的数据, 并用此数据配合主线程更新UI.      解释: 当应用程序启动时，Android首先会开启一个主线程 (也就是UI线...                    </div>                    <ul>                        <li class="avatar_img"><a href="http://blog.csdn.net/xiang_pao" target="_blank" strategy="BlogCommendFromCsdn_2"><img src="http://avatar.csdn.net/C/4/B/2_xiang_pao.jpg" alt="xiang_pao" title="xiang_pao"></a></li>                        <li class="user_name"><a href="http://blog.csdn.net/xiang_pao" target="_blank">xiang_pao</a></li>                        <li class="time">2014-03-10 20:38</li>                        <li class="visited_num"><i class="icon iconfont icon-read"></i><span>252</span></li>                    </ul>                </dd>            </dl>                        <dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post">                <dd>                    <h2><a href="/s2311307/article/details/76769468" target="_blank" strategy="BlogCommendFromCsdn_3">分析Android中Handle机制</a></h2>                    <div class="summary">                        上次浅分析了android中的绘画机制，今天我们来谈谈，android中的Handle机制。在一开始学习Android的时候，总会遇见一个问题，更新UI只能在主线程中进行，而有时候做耗时操作（耗时操作...                    </div>                    <ul>                    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当我们在处理下载或是其他需要长时间执行的任务时，如果直接把处理函数放Activity的OnCreate或是OnStart中，会导致执行过程中整个Activity无响应，如果时间过长，程序还会挂掉。Ha...                    </div>                    <ul>                        <li class="avatar_img"><a href="http://blog.csdn.net/sinat_32869075" target="_blank" strategy="BlogCommendFromCsdn_4"><img src="http://avatar.csdn.net/4/6/6/2_sinat_32869075.jpg" alt="sinat_32869075" title="sinat_32869075"></a></li>                        <li class="user_name"><a href="http://blog.csdn.net/sinat_32869075" target="_blank">sinat_32869075</a></li>                        <li class="time">2016-03-08 12:32</li>                        <li class="visited_num"><i class="icon iconfont icon-read"></i><span>207</span></li>                    </ul>                </dd>            </dl>                        <dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post">                <dd>                    <h2><a href="/dai_jing/article/details/8892452" target="_blank" strategy="BlogCommendFromCsdn_5">关于c++static关键字和extern关键字</a></h2>                    <div class="summary">                        1.static用于变量当我们将变量声明为static类型，如：static int n=0,这就告诉编译器记住第一次的声明，以后再重复使用时不再声明，相当于在文件内定义一个全局变量下面给出一个例...                    </div>                    <ul>                        <li class="avatar_img"><a href="http://blog.csdn.net/dai_jing" target="_blank" strategy="BlogCommendFromCsdn_5"><img src="http://avatar.csdn.net/B/5/A/2_dai_jing.jpg" alt="dai_jing" title="dai_jing"></a></li>                        <li class="user_name"><a href="http://blog.csdn.net/dai_jing" target="_blank">dai_jing</a></li>                        <li class="time">2013-05-06 21:42</li>                        <li class="visited_num"><i class="icon iconfont icon-read"></i><span>578</span></li>                    </ul>                </dd>            </dl>                        <dl class="clearfix csdn-tracking-statistics" 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class="user_name"><a href="http://blog.csdn.net/u013868143" target="_blank">u013868143</a></li>                        <li class="time">2017-01-09 13:53</li>                        <li class="visited_num"><i class="icon iconfont icon-read"></i><span>82</span></li>                    </ul>                </dd>            </dl>                        <dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post">                <dd>                    <h2><a href="/zyttae/article/details/44926393" target="_blank" strategy="BlogCommendFromCsdn_9">关于MFC中的#ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #endif</a></h2>                    <div class="summary">                        情况1:#ifdef _DEBUGvirtual void AssertValid() const; //assert(断言)valid(有效的，正确的)virtual void Dump...                    </div>                    <ul>                        <li class="avatar_img"><a href="http://blog.csdn.net/ZYTTAE" 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class="summary">                        今天遇到一篇写的浅显易懂的文章，特别贴出来。在Android的UI开发中，我们经常会使用Handler来控制主UI程序的界面变化。有关Handler的作用，我们总结为：与其他线程协同工作，接收...                    </div>                    <ul>                        <li class="avatar_img"><a href="http://blog.csdn.net/u010550007" target="_blank" strategy="BlogCommendFromCsdn_11"><img src="http://avatar.csdn.net/6/E/8/2_u010550007.jpg" alt="u010550007" title="u010550007"></a></li>                        <li class="user_name"><a href="http://blog.csdn.net/u010550007">u010550007</a></li>                        <li class="time">2015-06-04 16:58</li>                        <li class="visited_num"><i class="icon iconfont icon-read"></i><span>375</span></li>                    </ul>                </dd>            </dl>                        <dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post">                <dd>                    <h2><a href="/li_huifeng/article/details/8280792" target="_blank" strategy="BlogCommendFromCsdn_12">Objective-C 关于 self 的用法总结</a></h2>                    <div class="summary">                        原文来自：OSChina今天新同事问了一些关于什么时候用全局变量，什么时候用self.赋值的问题，所以笔者在此说明一下。何时使用self.在网上搜索或者论坛里的回复大多都是简简单单的说...                    </div>                    <ul>                        <li class="avatar_img"><a href="http://blog.csdn.net/Li_Huifeng" target="_blank" strategy="BlogCommendFromCsdn_12"><img src="http://avatar.csdn.net/F/8/B/2_li_huifeng.jpg" alt="Li_Huifeng" title="Li_Huifeng"></a></li>                        <li class="user_name"><a href="http://blog.csdn.net/Li_Huifeng">Li_Huifeng</a></li>                        <li class="time">2012-12-11 09:08</li>                        <li class="visited_num"><i class="icon iconfont icon-read"></i><span>1049</span></li>                    </ul>                </dd>            </dl>                        <dl class="clearfix csdn-tracking-statistics" 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class="time">2016-09-26 20:01</li>                        <li class="visited_num"><i class="icon iconfont icon-read"></i><span>69</span></li>                    </ul>                </dd>            </dl>                        <dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post">                <dd>                    <h2><a href="/tianxiangshan/article/details/7807230" target="_blank" strategy="BlogCommendFromCsdn_16">handle的用法</a></h2>                    <div class="summary">                        Handler是Android消息模型最重要的一个概念，它可以说是Android消息模型的核心，对于Looper、MessageQueue、Message 等概念一般在应用中很少使用。在Android...                    </div>                    <ul>                        <li class="avatar_img"><a href="http://blog.csdn.net/tianxiangshan" target="_blank" strategy="BlogCommendFromCsdn_16"><img src="http://avatar.csdn.net/2/3/1/2_tianxiangshan.jpg" alt="tianxiangshan" title="tianxiangshan"></a></li>               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bean;public cl...                    </div>                    <ul>                        <li class="avatar_img"><a href="http://blog.csdn.net/irelandken" target="_blank" strategy="BlogCommendFromCsdn_19"><img src="http://avatar.csdn.net/F/C/E/2_irelandken.jpg" alt="irelandken" title="irelandken"></a></li>                        <li class="user_name"><a href="http://blog.csdn.net/irelandken">irelandken</a></li>                        <li class="time">2011-11-02 09:49</li>                        <li class="visited_num"><i class="icon iconfont icon-read"></i><span>2176</span></li>                    </ul>                </dd>            </dl>            </div>    </main>    <aside>        <div class="right_box user_info">            <dl class="inf_bar clearfix">                <dt class="csdn-tracking-statistics" data-mod="popu_381">                    <a href="http://blog.csdn.net/u013010578" target="_blank">                        <img 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