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<!DOCTYPE HTML>
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<hgroup>
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<h2>关于我</h2>
<p>生活@hangzhou. 工作@netease.<br/> 移动端码农. 正在减肥的胖子. 食肉. <br/>想养喵但老婆不让</p>
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<div id="content" class="inner">
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2015-02-19T00:00:00.000000+0800" itemprop="datePublished">2015-02-19</time>
</div>
<div class="tags">
<a href="http://blog.aaapei.com/tags/bitmapxing-neng-you-hua">bitmap，性能优化</a> </div>
</div> <h1 class="title" itemprop="name"><a href="http://blog.aaapei.com/article/2015/02/bookingcom-androidke-hu-duan-de-bitmapfu-yong" itemprop="url">booking.com android客户端的bitmap复用</a></h1>
<div class="entry-content" itemprop="description"><h3>前言</h3>
<p>被鞭炮吵得睡不着觉，rss中找一篇简单的文档翻译下，原文链接：http://blog.booking.com/android-reuse-bitmaps.html，大部分团队应该都做过这个bitmap优化，不过估计设置过BitmapFactory.Options.inTempStorage参数的应该不多 :)</p>
<p>booking.com android客户端在新版本的增加了一个新功能：酒店的图片集合</p>
<p><img alt="此处输入图片的描述" src="http://blog.booking.com/static/android-reuse-bitmaps/hotel_photo_header.png"></p>
<p>不幸的是，增加了这个新功能后，发现这个应用的内存消耗增长了20%。图片集的界面的滑动有明显的卡顿，经定位，我们发现viewpager加载图片时的gc问题造成了以上的问题。由于应用的图片资源多；控件布局层次复杂；数据量较大，造成内存的申请很容易触发GC。</p>
<p>当申请bitmap内存时，logcat输出信息如下：</p>
<div class="highlight"><pre><span></span>GC_FOR_ALLOC freed 3255K, 20% free 21813K/26980K, paused 62ms, total 62ms
GC_FOR_ALLOC freed 710K, 20% free 30242K/37740K, paused 72ms …</pre></div>
<br/ >
<a href="http://blog.aaapei.com/article/2015/02/bookingcom-androidke-hu-duan-de-bitmapfu-yong">查看全文</a>
</div>
<div class="meta">
<span class="author">Posted by <a href="http://blog.aaapei.com/author/zhengwen.html">zhengwen</a></span>
</div>
</article>
<hr/>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2015-02-01T00:00:00.000000+0800" itemprop="datePublished">2015-02-01</time>
</div>
<div class="tags">
<a href="http://blog.aaapei.com/tags/listviewxing-neng-you-hua">listview，性能优化</a> </div>
</div> <h1 class="title" itemprop="name"><a href="http://blog.aaapei.com/article/2015/02/facebookxin-wen-ye-listviewyou-hua" itemprop="url">facebook新闻页ListView优化</a></h1>
<div class="entry-content" itemprop="description"><h3>引言</h3>
<p>原文链接：<a href="https://code.facebook.com/posts/879498888759525/fast-rendering-news-feed-on-android/">https://code.facebook.com/posts/879498888759525/fast-rendering-news-feed-on-android/</a>
透漏的信息量不大，且大多数项目并不会遇到facebook这种ListView的场景，不过可以拓展下思路：逻辑单元不一定是视图单元；移动端不要死搬MVC的架构，在市场上仍是中低端机型为主时，还是应该多考虑性能；附上rebbit的关于本文的<a href="http://www.reddit.com/r/androiddev/comments/2tzrqe/fast_rendering_news_feed_on_android/">讨论</a>，有些干货 :)</p>
<h3>基础知识</h3>
<p>android系统每隔16.7ms发出一个渲染信号，通知ui线程进行界面的渲染。为了达到流畅的体验，应用程序需要在这个时间内完成应用逻辑，使系统达到60fps。当一个Listview被添加到布局时，其关联的adapter的getView方法将会被回调。在16.7毫秒这样一个时间单元内，可见listitem单元的getView方法将被按照顺序执行。在大多数情况下，由于其他绘图行为的存在，例如measure和draw，getVIew实际分配到执行时间远低于16ms。一旦listview包含复杂控件时，在16毫秒内不能完成渲染，用户只能看到上一祯的结果，这时就发生了掉帧。</p>
<h3>Facebook新闻页介绍</h3>
<p>Facebook的新闻页是一个复杂的listview控件，如何使它获得流畅的滚动体验一直困扰我们。
首先，新闻页的每一条新闻的可见区域非常大，包含一系列的文本以及照片；其次，新闻的展现类型也很多样，除了文本以及照片，新闻的附件还可包含链接、音频 …</p>
<br/ >
<a href="http://blog.aaapei.com/article/2015/02/facebookxin-wen-ye-listviewyou-hua">查看全文</a>
</div>
<div class="meta">
<span class="author">Posted by <a href="http://blog.aaapei.com/author/zhengwen.html">zhengwen</a></span>
</div>
</article>
<hr/>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2014-12-21T00:00:00.000000+0800" itemprop="datePublished">2014-12-21</time>
</div>
<div class="tags">
<a href="http://blog.aaapei.com/tags/android">android</a> , <a href="http://blog.aaapei.com/tags/yi-bu">异步</a> </div>
</div> <h1 class="title" itemprop="name"><a href="http://blog.aaapei.com/article/2014/12/androidyi-bu-bian-cheng" itemprop="url">android异步编程</a></h1>
<div class="entry-content" itemprop="description"><p>在android开发中，有两条很重要的<a href="http://developer.android.com/guide/components/processes-and-threads.html">编程准则</a></p>
<ul>
<li>不要堵塞ui线程</li>
<li>不要在非ui线程操作ui控件</li>
</ul>
<p>开发者必须这两个遵守单线程模型的准则，将耗时的逻辑转移到非ui线程进行，得出计算结果后，通知ui线程进行数据的展现。本文介绍一下android的异步编程。</p>
<h3>android线程模型</h3>
<p>同hotspot vm一样，在daivlk vm中，采取的是1：1线程模型，每一个android thread对应一个Native Linux thread；linux内核通过cfs（completely fair scheduler）来进行线程调度，在cfs中着影响一个线程时间分配的因素有两个：</p>
<ul>
<li>thread priority</li>
<li>thread group</li>
</ul>
<h4>thread group</h4>
<p>线程的thread group是动态改变的，在android framework层面，android的应用有5个等级，分别是</p>
<ul>
<li>foreground process</li>
<li>visible process</li>
<li>service process</li>
<li>backgroud process</li>
<li>empty process </li>
</ul>
<p>它们的thread …</p>
<br/ >
<a href="http://blog.aaapei.com/article/2014/12/androidyi-bu-bian-cheng">查看全文</a>
</div>
<div class="meta">
<span class="author">Posted by <a href="http://blog.aaapei.com/author/zhengwen.html">zhengwen</a></span>
</div>
</article>
<hr/>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
<div class="meta">
<div class="date">
<time datetime="2014-11-09T00:00:00.000000+0800" itemprop="datePublished">2014-11-09</time>
</div>
<div class="tags">
<a href="http://blog.aaapei.com/tags/dalvik">dalvik</a> , <a href="http://blog.aaapei.com/tags/jni">jni</a> </div>
</div> <h1 class="title" itemprop="name"><a href="http://blog.aaapei.com/article/2014/11/dalvik-jnijie-xi" itemprop="url">dalvik jni解析</a></h1>
<div class="entry-content" itemprop="description"><p>android开发者在移植第三方native库时,经常会使用到jni. <br>
Java Native Interface(java本地接口),用于java与c/c++代码进行交互.需要了解的是,jni只是jvm的一个规范,各家虚拟机有各自的实现,本文分享一下dalvik中jobject reference的实现.</p>
<h3>jobject reference type</h3>
<p>jni规范中,对jobject定义了两种reference类型:</p>
<ul>
<li>全局引用（global reference）</li>
<li>局部引用（local reference）</li>
</ul>
<p>在JNI Specification中的说明是:</p>
<blockquote>
<p>Local references are valid for the duration of a native method call, and are automatically freed after the native method returns. Global references …</p></blockquote>
<br/ >
<a href="http://blog.aaapei.com/article/2014/11/dalvik-jnijie-xi">查看全文</a>
</div>
<div class="meta">
<span class="author">Posted by <a href="http://blog.aaapei.com/author/zhengwen.html">zhengwen</a></span>
</div>
</article>
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