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<time datetime="2014-08-09T00:00:00.000000+0800" itemprop="datePublished">2014-08-09</time>
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<a href="http://blog.aaapei.com/tags/yu-ming">域名</a> </div>
</div> <h1 class="title" itemprop="name"><a href="http://blog.aaapei.com/article/2014/08/blogaaapeicom" itemprop="url">blog.aaapei.com</a></h1>
<div class="entry-content" itemprop="description"><p>前端时间为了科学上网买了个vps，准备用aaapei这个主域名收回来，用在vps跑一些试验性服务，blog切到二级子域名 blog.aaapei.com</p>
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<br/ >
<a href="http://blog.aaapei.com/article/2014/08/blogaaapeicom">查看全文</a>
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<time datetime="2014-04-19T23:21:00.000000+0800" itemprop="datePublished">2014-04-19</time>
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<a href="http://blog.aaapei.com/tags/android">android</a> , <a href="http://blog.aaapei.com/tags/lua">lua</a> </div>
</div> <h1 class="title" itemprop="name"><a href="http://blog.aaapei.com/article/2014/04/androidzhong-luajiao-ben-de-bu-shu" itemprop="url">android中lua脚本的部署</a></h1>
<div class="entry-content" itemprop="description"><p>“愤怒的小鸟”中，lua脚本是运行时部署在应用的data目录，同时做了脚本加密；<br>
但是如果你的lua脚本有了模块包，脚本就会有多级目录，而android的data目录下是不允许有子目录；<br>
当然，lua脚本也可以在运行时拷贝到外置sd卡中，不过既然放置在不安全的公共目录，就会有被第三方删除或篡改的危险，那么每次启动的时候必须做一次文件校验，同时，也必须对脚本进行加密，避免程序逻辑暴露； </p>
<h3>lua自定义加载器</h3>
<p>lua引擎提供了一个自定义加载器，当lua脚本中调用require时，会回调到自定义加载器的CFunction；利用这样特性，可以尝试取消掉脚本的运行时拷贝，而直接从应用的asset资源目录加载；自定义加载器的原理中，云风的blog中有介绍，<a href="http://blog.codingnow.com/2007/04/user_define_lua_loader.html">以自定义方式加载lua模块</a><br>
直接贴个代码实现 </p>
<div class="highlight"><pre><span></span><span class="kt">void</span> <span class="nf">addAssetLuaLoader</span><span class="p">(</span><span class="n">lua_State</span> <span class="o">*</span><span class="n">L</span><span class="p">,</span> <span class="n">lua_CFunction</span> <span class="n">func</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">func</span><span class="p">)</span> <span class="k">return</span><span class="p">;</span>
<span class="n">lua_getglobal</span><span class="p">(</span><span class="n">L</span><span class="p">,</span> <span class="s">"package"</span><span class="p">);</span>
<span class="n">lua_getfield</span><span class="p">(</span><span class="n">L</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="s">"loaders"</span><span class="p">);</span>
<span class="n">lua_pushcfunction</span><span class="p">(</span><span class="n">L</span><span class="p">,</span> <span class="n">func</span><span class="p">);</span>
<span class="kt">int</span> <span class="n">i</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span>
<span class="k">for</span> <span class="p">(</span> <span class="n">i …</span></pre></div>
<br/ >
<a href="http://blog.aaapei.com/article/2014/04/androidzhong-luajiao-ben-de-bu-shu">查看全文</a>
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<div class="meta">
<span class="author">Posted by <a href="http://blog.aaapei.com/author/zhengwen.html">zhengwen</a></span>
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</article>
<hr/>
<article class="post" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
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<div class="date">
<time datetime="2014-02-19T19:50:00.000000+0800" itemprop="datePublished">2014-02-19</time>
</div>
<div class="tags">
<a href="http://blog.aaapei.com/tags/lua">lua</a> , <a href="http://blog.aaapei.com/tags/luajava">luajava</a> </div>
</div> <h1 class="title" itemprop="name"><a href="http://blog.aaapei.com/article/2014/02/luazai-kua-yu-yan-huan-jing-zhong-de-nei-cun-xie-lu" itemprop="url">lua在跨语言环境中的内存泄露</a></h1>
<div class="entry-content" itemprop="description"><p>前段时间在android环境中使用lua,采用的luabridge是luajava,遇到一个内存泄露问题,查了很久,终于定位了;</p>
<p>场景是这样的:<br>
1:在lua中创建了一个java对象,将jobject指针传递给java;对应在luajava中,即传递了一个luaobject给java;java保存了这个对象;<br>
2:在Lua中需要对这个java对象设置一个事件回调,比如说为某个控件setOnClickListener;<br>
其中设置的代码是这样的:</p>
<div class="highlight"><pre><span></span><span class="kd">local</span> <span class="n">viewclick_cb</span><span class="o">=</span><span class="p">{}</span>
<span class="k">function</span> <span class="nc">viewclick_cb</span><span class="p">.</span><span class="nf">onClick</span><span class="p">(</span><span class="n">v</span><span class="p">)</span>
<span class="n">self</span><span class="p">:</span><span class="n">cb</span><span class="p">(</span><span class="n">v</span><span class="p">)</span>
<span class="k">end</span>
<span class="kd">local</span> <span class="n">listenerProxy</span> <span class="o">=</span> <span class="n">luajava</span><span class="p">.</span><span class="n">createProxy</span><span class="p">(</span><span class="s1">'</span><span class="s">android.view.View$OnClickListener'</span><span class="p">,</span><span class="n">viewclick_cb</span><span class="p">)</span>
<span class="n">javaobjhandler</span><span class="p">:</span><span class="n">setOnClickListener</span><span class="p">(</span><span class="n">ListenerProxy</span><span class="p">)</span>
</pre></div>
<p>lua和java交互时,对象生命周期管理分两种情况:</p>
<blockquote>
<p>1:java对象传递个lua虚拟机,lua虚拟机为java对象创建一个userdata,在globalref中增加一个引用,标记这个java对象正在被使用;同时,为这个userdata设置一个__gc元方法,当lua对象需要被释放时,_gc元方法回调,释放掉java对象的globaref …</p></blockquote>
<br/ >
<a href="http://blog.aaapei.com/article/2014/02/luazai-kua-yu-yan-huan-jing-zhong-de-nei-cun-xie-lu">查看全文</a>
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<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">
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<div class="date">
<time datetime="2014-01-28T17:30:00.000000+0800" itemprop="datePublished">2014-01-28</time>
</div>
<div class="tags">
<a href="http://blog.aaapei.com/tags/android">android</a> </div>
</div> <h1 class="title" itemprop="name"><a href="http://blog.aaapei.com/article/2014/01/android-bitmap-tips" itemprop="url">android bitmap tips</a></h1>
<div class="entry-content" itemprop="description"><p>大部分android开发者只知道bitmap再使用之后，需要显式的调用一次bitmap.recycle，回收bitmap内存; </p>
<p>这个观点，在android3.0之后其实已经过时了，android3.0将bitmap所引用的位图资源从native heap移到虚拟机的heap空间，bitmap的生命周期由虚拟机管理，开发者只需要保证在应用中不在持有对bitmap的引用，即可保证不发生内存泄漏；位图资源的内存由GC进行回收；<br>
将bitmap的位图内存转移到虚拟机heap后，由于位图资源本身较大，造成gc的概率的增加 </p>
<h3>bitmap proxy</h3>
<p>在一般的应用场景中，bitmap的引用一般是和imageview关联；当大量imageview持有对bitmap的引用时，虚拟机无法释放bitmap的内存，导致oom；</p>
<p>针对这种场景，开发者可以实现一个bitmap的代理类，作为bitmap和imageview的中间层，在imageview不可见时（例如imageview是一个listview的子控件，listview发生滚动/activiy切换到后台），即释放掉对bitamp的引用；当imageview重新可见时，通过代理类重新去加载bitmap，以解耦bitmap和iamgeview的引用关系; </p>
<h3>inBitmap</h3>
<p>android在3.0之后新增了一个BitmapFactory.Options.inBitmap开关，加了这个开关之后，bitmapfactory在加载位图时候，会尝试使用inbitmap指向的已分配在heap中位图空间；而不是重新申请一块内存；从而减少了虚拟机最讨厌的短生命周期大内存对象； 不过这个开关有严格的使用场景，即两个bitamp的位图大小必须一致</p>
<br/ >
<a href="http://blog.aaapei.com/article/2014/01/android-bitmap-tips">查看全文</a>
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