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<a href="/2024/05/12/build-pdfium/" class="post-title-link" itemprop="url">如何构建一个pdfium.so</a>
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<time title="创建时间：2024-05-12 14:50:01" itemprop="dateCreated datePublished" datetime="2024-05-12T14:50:01+08:00">2024-05-12</time>
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<h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>项目中接入了打开pdf文件的功能，使用的是<a target="_blank" rel="noopener" href="https://github.com/barteksc/PdfiumAndroid/">https://github.com/barteksc/PdfiumAndroid/</a>。现在想升级一下pdfium库，旧库具体原因就不解释了，毕竟这个项目最后一个commit在6年前，当然，平常用来接入打开pdf也是没问题的。</p>
<h1 id="开源库"><a href="#开源库" class="headerlink" title="开源库"></a>开源库</h1><p>在google一通搜索，发现pdfium库包含两套，一套在aosp中，另一套在chromium中。</p>
<ul>
<li><a target="_blank" rel="noopener" href="https://android.googlesource.com/platform/external/pdfium/">https://android.googlesource.com/platform/external/pdfium/</a></li>
<li><a target="_blank" rel="noopener" href="https://pdfium.googlesource.com/pdfium/">https://pdfium.googlesource.com/pdfium/</a><br>两款代码应该差不多，aosp的构建使用Android.bp，版本要比pdfium版本的落后一些。再看PdfiumAndroid项目README，第一句就说Uses pdfium library from AOSP，使用的库应该也是aosp的库。</li>
</ul>
<h1 id="构建aosp版"><a href="#构建aosp版" class="headerlink" title="构建aosp版"></a>构建aosp版</h1><h2 id="准备"><a href="#准备" class="headerlink" title="准备"></a>准备</h2><ol>
<li>ubuntu 可以使用virtual box去装个虚拟机</li>
<li>200GB以上硬盘空间，清华会推荐你下载aosp-latest.tar再解压，光压缩包80G了，解压完我就把tar包删了</li>
</ol>
<h2 id="获取aosp源码"><a href="#获取aosp源码" class="headerlink" title="获取aosp源码"></a>获取aosp源码</h2><p>推荐使用清华镜像<a target="_blank" rel="noopener" href="https://mirrors-i.tuna.tsinghua.edu.cn/help/AOSP/">https://mirrors-i.tuna.tsinghua.edu.cn/help/AOSP/</a>，可结合google的官方说明<a target="_blank" rel="noopener" href="https://source.android.com/docs/setup?hl=zh-cn">https://source.android.com/docs/setup?hl=zh-cn</a>。具体指令就不介绍了，主要是repo sync费时，注意选好你想构建的build tag。</p>
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<h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>之前买了一台NX54路由器，结果这路由固件完全不给用户定制化的机会，研究如何保存ip6table的配置没有成功，但是成功保存了telnet开启配置，分享一下。这套固件的情况如下:</p>
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<li>默认开启ipv6防火墙，且关闭后，重启会失效，再次打开。</li>
<li>可以通过telnet连接路由，telnet配置也不保存，停电或者重启后失效。</li>
<li>根目录使用overlayfs做到了tmp下，是整个系统会恢复的主要原因。</li>
<li>提供了/mnt目录保存数据，/mnt/bak/startup.bak就是所有配置项。
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<h1 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h1><p>jetpack当时还没来得及用，整个项目就被砍掉了，这两年一直没有接触，最近好多岗位都要求会jetpack，这两年逐渐用的人越来越多，重学Android赶紧简单了解一下，做了一点整理，都是皮毛，供自己查笔记用吧，如果有一些知识点需要增加备注，随时修改。</p>
<h1 id="Navigation-用于fragment切换"><a href="#Navigation-用于fragment切换" class="headerlink" title="Navigation 用于fragment切换"></a>Navigation 用于fragment切换</h1><h2 id="优点"><a href="#优点" class="headerlink" title="优点"></a>优点</h2><ul>
<li>可视化，可以as中可视化编辑</li>
<li>通过destination和action完成页面的导航</li>
<li>参数传递安全， safe args</li>
<li>支持deeplink，支持创建PendingIntent
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<h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>大概半个月前，群里的一个小伙伴问，谁能把某电商APP的订单列表导出到电脑，有个私活，报个价。其实我对这种稍微有点了解，无非是抓包，破解。但通常App的网络请求会有一套签名验证机制，所以要想模拟出整套请求流程，也算比较复杂。和群里的讨论后，觉得用hook做合适，但群里和我一样，都是安卓开发，没有逆向工程师，首先想到的是xposed。</p>
<h1 id="xposed太重"><a href="#xposed太重" class="headerlink" title="xposed太重"></a>xposed太重</h1><p>我之前倒是写过xposed，xposed缺点有两个，第一就是环境复杂，你得安装xposed环境才可以，目前都是通过virtual xposed来使用。再就是插件一但有修改，就得重启手机。不过这也带来了一个有点就是持久化，只要装进去，就一直存在。那有没有更轻量级的工具可以达到这种效果，后来在网上找到了frida。(这也好几年了，我居然不知道)</p>
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<h1 id="导读"><a href="#导读" class="headerlink" title="导读"></a>导读</h1><p>因为2021年开始做C++，之前的项目还没来得及怎么用kotlin，就直接被爸爸宣布死刑了。所以目前找工作等于需要再学一次kotlin，特别是协程，之前几乎没有了解。买了本书，再加上网上的各种文章，整理一点笔记出来。如果有和我差不多的，可以看一看</p>
<p>协程，协程可以理解为某种自由调度的任务，主要是对函数挂起，恢复。听起来像线程的唤醒，本质上和线程没什么关系。使用协程，我们可以以单线程的方式写多线程的代码，同时还能节省线程资源，并且能方便处理异常信息，返回结果等。我们给函数前面加一个<code>suspend</code>关键字，就变成一个挂起函数，可以在函数内操作协程的挂起和恢复。其中部分内容有重复，不必理会。主要参考资料<深入理解Kotlin协程>，算是一个简单的笔记整理。</p>
<h1 id="协程的API"><a href="#协程的API" class="headerlink" title="协程的API"></a>协程的API</h1><h2 id="什么是挂起"><a href="#什么是挂起" class="headerlink" title="什么是挂起"></a>什么是挂起</h2>
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<h1 id="第2节"><a href="#第2节" class="headerlink" title="第2节"></a>第2节</h1><p>防卫式声明，防止重复include引起的问题(guard)</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">//complex.h</span><br><span class="line">#ifndef _COMPLEX_</span><br><span class="line">#def _COMPLEX_</span><br><span class="line">...</span><br><span class="line">#endif</span><br></pre></td></tr></table></figure>
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<h1 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h1><p>想要编译一个自己的framework，用来在系统api中插入自己的代码，监听一下应用的行为，比如获取imei，获取网络。最直接的想法就是，修改安卓源码，直接编译出一个系统镜像，给模拟器使用。</p>
<p>准备：</p>
<ol>
<li><p>因为之前编译过android.jar，所以源码环境还有，直接开工，或者看以前编译的文章有讲。</p>
</li>
<li><p>修改代码，比如找到TelephonyManager.java，在getDeviceId()中插入自己的代码。</p>
</li>
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<h1 id="需求"><a href="#需求" class="headerlink" title="需求"></a>需求</h1><p>没有需求，自己看了一眼自己之前写的打包脚本，简直无法看下去。而且，产品经理的定制化需求越来越多，用shell脚本的可读性也越来越差，再加上里面一堆的sed命令，惨不忍睹。</p>
<p>改!!!</p>
<h1 id="分析"><a href="#分析" class="headerlink" title="分析"></a>分析</h1><p>gradle其实支持自定义参数，关于自定义参数的介绍，参考官方文档：<a target="_blank" rel="noopener" href="https://docs.gradle.org/current/userguide/build_environment.html%EF%BC%8C%E7%AE%80%E5%8D%95%E8%AF%B4%E4%B8%80%E4%B8%8B%E7%94%A8%E5%88%B0%E7%9A%84%EF%BC%9A[Gradle">https://docs.gradle.org/current/userguide/build_environment.html，简单说一下用到的：[Gradle</a> properties](<a target="_blank" rel="noopener" href="https://docs.gradle.org/current/userguide/build_environment.html#sec:gradle_configuration_properties)%EF%BC%9A">https://docs.gradle.org/current/userguide/build_environment.html#sec:gradle_configuration_properties)：</a></p>
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