Android插件实例——360 DroidPlugin具体解释

在中国找到钱不难，但你的一个点子不意味着是一个创业。你谈一个再好的想法，比方我今天谈一个创意说，新浪为什么不收购GOOGLE呢？这个创意非常好。新浪一收购GOOGLE。是不是新浪就变成老大了？你从哪儿弄来钱？怎么去整合GOOGLE呢；

之前写过有关于Android 插件方向的文章，解析了一下Android的插件原理与执行方式。非常多小伙伴都问我。为什么不把我制作的插件放到Github上，让大家共享一下。

我仅仅能说。大哥啊，这个插件是我在公司研发的时候制作的，商业机密。不能开源啊。

刚好。近期逛github的时候。看到了奇虎360手机助手团队的一个Android插件开源项目。

今天。我们就详细的分析一下它的原理与实现逻辑。让大家更清楚的了解，一个Android插件的构造。

360 Android 插件项目 DroidPlugin

这个框架是奇虎360手机助手团队，近期在github上开源出来的Android插件框架。这样的精神是非常值得鼓舞的。

github地址为： https://github.com/Qihoo360/DroidPlugin

好。一下纯属引入了官方的说明：

说明

DroidPlugin是360手机助手在Android系统上实现了一种新的插件机制:

它能够在无需安装、改动的情况下执行APK文件,此机制对改进大型APP的架构，实现多团队协作开发具有一定的优点。

特点

支持Androd 2.3以上系统

插件APK全然不需做不论什么改动，能够独立安装执行、也能够做插件执行。
要以插件模式执行某个APK，你无需又一次编译、无需知道其源代码。

插件的四大组件全然不须要在Host程序中注冊，支持Service、Activity、BroadcastReceiver、ContentProvider四大组件

插件之间、Host程序与插件之间会互相觉得对方已经”安装”在系统上了。

API低侵入性：极少的API。HOST程序仅仅是须要一行代码就可以集成Droid Plugin

超强隔离：插件之间、插件与Host之间全然的代码级别的隔离：不能互相调用对方的代码。
通讯仅仅能使用Android系统级别的通讯方法。

支持全部系统API 资源全然隔离：插件之间、与Host之间实现了资源全然隔离。不会出现资源窜用的情况。

实现了进程管理，插件的空进程会被及时回收，占用内存低。

插件的静态广播会被当作动态处理，假设插件没有执行（即没有插件进程执行）。其静态广播也永远不回被触发。

那么这个插件框架。和我们之前所说的插件框架，有什么特点？它的实现方式是什么样的？这里我们从源代码来分析一下。

插件原理——DexClassLoader

之前，我们也讨论过。一个Android的apk插件是个什么形式。主要是三点。我总结例如以下：

- DexLoader动态的载入dex文件进入vm

- AndroidManifest.xml中预注冊一些将要使用的四大组件（方法非常low，事实上有更好的）

- 针对四大组件，分别进行抽象代理，proxy

- Apk安装还须要单独处理native的,so文件。

- 宿主须要处理好Resource，保证R文件的正确使用。

360这个Android插件系统是否和我们之前讨论的类似呢？这里我们从IPluginManagerImpl.java文件里，我们可以看到其真正的安装apk插件的方法——installPackage。具体方法具体解释例如以下所看到的：

<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">    <span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
      *<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> filepath 插件Apk的路径
      *<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> flags Flag
      *
      */</span>
    <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span>
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> <span class="hljs-title" style="box-sizing: border-box;">installPackage</span>(String filepath, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> flags) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> RemoteException {
        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//install plugin</span>
        String apkfile = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> {
            <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 验证合法性</span>
            PackageManager pm = mContext.getPackageManager();
            PackageInfo info = pm.getPackageArchiveInfo(filepath, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (info == <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>) {
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> PackageManagerCompat.INSTALL_FAILED_INVALID_APK;
            }

            apkfile = PluginDirHelper.getPluginApkFile(mContext, info.packageName);

            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> ((flags & PackageManagerCompat.INSTALL_REPLACE_EXISTING) != <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>) {
                <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 新安装的插件</span>

                <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 停止，删除插件的缓存</span>
                forceStopPackage(info.packageName);
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (mPluginCache.containsKey(info.packageName)) {
                    deleteApplicationCacheFiles(info.packageName, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>);
                }
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(apkfile).delete();
                Utils.copyFile(filepath, apkfile);
                PluginPackageParser parser = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> PluginPackageParser(mContext, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(apkfile));
                parser.collectCertificates(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);
                PackageInfo pkgInfo = parser.getPackageInfo(PackageManager.GET_PERMISSIONS | PackageManager.GET_SIGNATURES);

                <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 验证申请的permission，宿主中是否存在，不存在不让安装。</span>
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (pkgInfo != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span> && pkgInfo.requestedPermissions != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span> && pkgInfo.requestedPermissions.length > <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>) {
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (String requestedPermission : pkgInfo.requestedPermissions) {
                        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">boolean</span> b = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>;
                        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> {
                            b = pm.getPermissionInfo(requestedPermission, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>) != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;
                        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (NameNotFoundException e) {
                        }
                        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!mHostRequestedPermission.contains(requestedPermission) && b) {
                            Log.e(TAG, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"No Permission %s"</span>, requestedPermission);
                            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(apkfile).delete();
                            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> PluginManager.INSTALL_FAILED_NO_REQUESTEDPERMISSION;
                        }
                    }
                }

                <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 保存签名</span>
                saveSignatures(pkgInfo);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                if (pkgInfo.reqFeatures != null && pkgInfo.reqFeatures.length > 0) {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                    for (FeatureInfo reqFeature : pkgInfo.reqFeatures) {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                        Log.e(TAG, "reqFeature name=%s,flags=%s,glesVersion=%s", reqFeature.name, reqFeature.flags, reqFeature.getGlEsVersion());</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                    }</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                }</span>

                <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 拷贝插件中的native库文件。</span>
                copyNativeLibs(mContext, apkfile, parser.getApplicationInfo(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>));
                <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// opt Dex文件，并使用DexClassLoader动态的加载类代码。</span>
                dexOpt(mContext, apkfile, parser);
                mPluginCache.put(parser.getPackageName(), parser);

                <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 回调函数，通知插件安装</span>
                mActivityManagerService.onPkgInstalled(mPluginCache, parser, parser.getPackageName());
                sendInstalledBroadcast(info.packageName);
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> PackageManagerCompat.INSTALL_SUCCEEDED;
            } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {
                <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 下面是插件，覆盖安装的过程。即更新的过程。与新安装相似。

不做解释了。

</span>

                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (mPluginCache.containsKey(info.packageName)) {
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> PackageManagerCompat.INSTALL_FAILED_ALREADY_EXISTS;
                } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {
                    forceStopPackage(info.packageName);
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(apkfile).delete();
                    Utils.copyFile(filepath, apkfile);
                    PluginPackageParser parser = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> PluginPackageParser(mContext, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(apkfile));
                    parser.collectCertificates(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);
                    PackageInfo pkgInfo = parser.getPackageInfo(PackageManager.GET_PERMISSIONS | PackageManager.GET_SIGNATURES);
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (pkgInfo != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span> && pkgInfo.requestedPermissions != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span> && pkgInfo.requestedPermissions.length > <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>) {
                        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (String requestedPermission : pkgInfo.requestedPermissions) {
                            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">boolean</span> b = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>;
                            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> {
                                b = pm.getPermissionInfo(requestedPermission, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>) != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;
                            } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (NameNotFoundException e) {
                            }
                            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!mHostRequestedPermission.contains(requestedPermission) && b) {
                                Log.e(TAG, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"No Permission %s"</span>, requestedPermission);
                                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(apkfile).delete();
                                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> PluginManager.INSTALL_FAILED_NO_REQUESTEDPERMISSION;
                            }
                        }
                    }
                    saveSignatures(pkgInfo);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                    if (pkgInfo.reqFeatures != null && pkgInfo.reqFeatures.length > 0) {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                        for (FeatureInfo reqFeature : pkgInfo.reqFeatures) {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                            Log.e(TAG, "reqFeature name=%s,flags=%s,glesVersion=%s", reqFeature.name, reqFeature.flags, reqFeature.getGlEsVersion());</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                        }</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//                    }</span>

                    copyNativeLibs(mContext, apkfile, parser.getApplicationInfo(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>));
                    dexOpt(mContext, apkfile, parser);
                    mPluginCache.put(parser.getPackageName(), parser);
                    mActivityManagerService.onPkgInstalled(mPluginCache, parser, parser.getPackageName());
                    sendInstalledBroadcast(info.packageName);
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> PackageManagerCompat.INSTALL_SUCCEEDED;
                }
            }
        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (Exception e) {
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (apkfile != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>) {
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(apkfile).delete();
            }
            handleException(e);
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> PackageManagerCompat.INSTALL_FAILED_INTERNAL_ERROR;
        }
    }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; 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padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li><li style="box-sizing: border-box; padding: 0px 5px;">76</li><li style="box-sizing: border-box; padding: 0px 5px;">77</li><li style="box-sizing: border-box; padding: 0px 5px;">78</li><li style="box-sizing: border-box; padding: 0px 5px;">79</li><li style="box-sizing: border-box; padding: 0px 5px;">80</li><li style="box-sizing: border-box; padding: 0px 5px;">81</li><li style="box-sizing: border-box; padding: 0px 5px;">82</li><li style="box-sizing: border-box; padding: 0px 5px;">83</li><li style="box-sizing: border-box; padding: 0px 5px;">84</li><li style="box-sizing: border-box; padding: 0px 5px;">85</li><li style="box-sizing: border-box; padding: 0px 5px;">86</li><li style="box-sizing: border-box; padding: 0px 5px;">87</li><li style="box-sizing: border-box; padding: 0px 5px;">88</li><li style="box-sizing: border-box; padding: 0px 5px;">89</li><li style="box-sizing: border-box; padding: 0px 5px;">90</li><li style="box-sizing: border-box; padding: 0px 5px;">91</li><li style="box-sizing: border-box; padding: 0px 5px;">92</li><li style="box-sizing: border-box; padding: 0px 5px;">93</li><li style="box-sizing: border-box; padding: 0px 5px;">94</li><li style="box-sizing: border-box; padding: 0px 5px;">95</li><li style="box-sizing: border-box; padding: 0px 5px;">96</li><li style="box-sizing: border-box; padding: 0px 5px;">97</li><li style="box-sizing: border-box; padding: 0px 5px;">98</li><li style="box-sizing: border-box; padding: 0px 5px;">99</li><li style="box-sizing: border-box; padding: 0px 5px;">100</li><li style="box-sizing: border-box; padding: 0px 5px;">101</li><li style="box-sizing: border-box; padding: 0px 5px;">102</li><li style="box-sizing: border-box; padding: 0px 5px;">103</li><li style="box-sizing: border-box; padding: 0px 5px;">104</li><li style="box-sizing: border-box; padding: 0px 5px;">105</li><li style="box-sizing: border-box; padding: 0px 5px;">106</li><li style="box-sizing: border-box; padding: 0px 5px;">107</li><li style="box-sizing: border-box; padding: 0px 5px;">108</li><li style="box-sizing: border-box; padding: 0px 5px;">109</li><li style="box-sizing: border-box; padding: 0px 5px;">110</li><li style="box-sizing: border-box; padding: 0px 5px;">111</li><li style="box-sizing: border-box; padding: 0px 5px;">112</li><li style="box-sizing: border-box; padding: 0px 5px;">113</li><li style="box-sizing: border-box; padding: 0px 5px;">114</li><li style="box-sizing: border-box; padding: 0px 5px;">115</li><li style="box-sizing: border-box; padding: 0px 5px;">116</li></ul>

下面是dexOpt方法的详细内容，简单的贴一下，不做说明了。

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">    private void dexOpt(Context hostContext, String apkfile, PluginPackageParser parser) throws Exception {
        String packageName = parser<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getPackageName</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
        String optimizedDirectory = PluginDirHelper<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getPluginDalvikCacheDir</span>(hostContext, packageName)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
        String libraryPath = PluginDirHelper<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getPluginNativeLibraryDir</span>(hostContext, packageName)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
        ClassLoader classloader = new PluginClassLoader(apkfile, optimizedDirectory, libraryPath, ClassLoader<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getSystemClassLoader</span>())<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
//        DexFile dexFile = DexFile<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.loadDex</span>(apkfile, PluginDirHelper<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getPluginDalvikCacheFile</span>(mContext, parser<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getPackageName</span>()), <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
//        Log<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.e</span>(TAG, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"dexFile=%s,1=%s,2=%s"</span>, dexFile, DexFile<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.isDexOptNeeded</span>(apkfile), DexFile<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.isDexOptNeeded</span>(PluginDirHelper<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getPluginDalvikCacheFile</span>(mContext, parser<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getPackageName</span>())))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
    }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>

占坑——预注冊四大组件

360 Android插件DroidPlugin中，基本的四大组件代理方式还是占坑。

这里所说的占坑就是指。在AndroidManifest.xml中预注冊下面可能会用到的信息。

ps.这个方式不是特别好。假设大家对为什么要预注冊这个问题不是非常了解。或者不了解为什么不好。能够看一下我的博客，我会持续更新。http://blog.csdn.net/yzzst/article/details/45582315

OK。以下是我们从DroidPlugin的Test项目中。截取出来的AndroidManifest.xml代码，我们看看什么叫占坑。怎么占坑。代码例如以下所看到的：

<code class="language-xml hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">application
</span>        <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:icon</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@drawable/ic_launcher"</span>
        <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@string/app_name"</span>
        <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:theme</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@style/AppTheme"</span> ></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".MyActivity"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@string/app_name"</span> ></span>
            <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">intent-filter</span>></span>
                <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">action</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.intent.action.MAIN"</span> /></span>

                <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">category</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.intent.category.LAUNCHER"</span> /></span>
            <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">intent-filter</span>></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span>></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".ServiceTest1"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"服务測试"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".ContentProviderTest"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"ContentProvider測试"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".BroadcastReceiverTest"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"广播測试"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".NotificationTest"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"通知測试"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".ServiceTest2"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"多进程服务測试"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".ContentProviderTest2"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"多进程ContentProvider測试"</span> /></span>

        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"><!-- 预声明不同process的Service --></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">service</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".Service1"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">service</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".Service2"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">service
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".Service3"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:process</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">":Process2"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">service
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".Service4"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:process</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">":Process2"</span> /></span>

        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"><!-- 预声明两种process的Provider --></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">provider
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".MyContentProvider1"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:authorities</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"com.example.ApiTest.MyContentProvider1"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">provider
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".MyContentProvider2"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:authorities</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"com.example.ApiTest.MyContentProvider2"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:process</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">":Process2"</span> /></span>

        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">receiver</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".StaticBroadcastReceiver"</span> ></span>
            <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">intent-filter</span>></span>
                <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">action</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"com.example.ApiTest.StaticBroadcastReceiver"</span> /></span>
            <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">intent-filter</span>></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">receiver</span>></span>

        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"><!-- 预声明各种launchMode的Activity --></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".StandardActivity"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@string/title_activity_standard"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".SingleTopActivity"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@string/title_activity_single_top"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:launchMode</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"singleTop"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".SingleTaskActivity"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@string/title_activity_single_task"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:launchMode</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"singleTask"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".SingleInstanceActivity"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@string/title_activity_single_instance"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:launchMode</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"singleInstance"</span> /></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".ActivityTestActivity"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:label</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@string/title_activity_activity_test"</span> ></span>
        <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span>></span>
<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">application</span>></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li><li style="box-sizing: border-box; padding: 0px 5px;">76</li><li style="box-sizing: border-box; padding: 0px 5px;">77</li><li style="box-sizing: border-box; padding: 0px 5px;">78</li></ul>

大家都看的出来，尽管简单的插件已经全然够用了。

可是这样的方式确实不是非常好。

Hook 系统API方法

DroidPlugin中最重要的就是。为了让插件中的方法可以正确的调用。

DroidPlugin把全部的，方法都在内部Hook并替换掉了。

等等。为什么不可以正确的调用？

由于。这个是一个插件系统，Activity是虚拟Proxy出来的。四大组件，并非真正的。即Context拿到不一定是真的。系统也不会有此类的回调。所以，非常多单例都须要Context才干使用。

比方：InputMethodManager.getInstance(Context context);

这时。插件中的代码将不可以直接执行。

当然。还有其它原因。

详细的替换和操作方法，我们可以在 HookFactory.java文件里installHook方法中，看到整个DroidPlugin的详细操作例如以下所看到的：

<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">installHook</span>(Context context, ClassLoader classLoader) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Throwable {
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IClipboardBinderHook(context), classLoader);
        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//for INotificationManager</span>
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> INotificationManagerBinderHook(context), classLoader);
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IMountServiceBinder(context), classLoader);
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IAudioServiceBinderHook(context), classLoader);
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IContentServiceBinderHook(context), classLoader);
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IWindowManagerBinderHook(context), classLoader);
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP_MR1) {
            installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IGraphicsStatsBinderHook(context), classLoader);
        }
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (VERSION.SDK_INT >= VERSION_CODES.KITKAT) {
            installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IMediaRouterServiceBinderHook(context), classLoader);
        }
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
            installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> ISessionManagerBinderHook(context), classLoader);
        }
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR2) {
            installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IWifiManagerBinderHook(context), classLoader);
        }

        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR2) {
            installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IInputMethodManagerBinderHook(context), classLoader);
        }

        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IPackageManagerHook(context), classLoader);
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> IActivityManagerHook(context), classLoader);
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> PluginCallbackHook(context), classLoader);
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> InstrumentationHook(context), classLoader);
        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> LibCoreHook(context), classLoader);

        installHook(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> SQLiteDatabaseHook(context), classLoader);
    }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li></ul>

限制和缺陷

Ok。说到最后。还是得称赞一下360。国内大公司开源的使用框架原来越少了。他们的这一举动确实是造福了眼下的Android开发人员。

可是，对于DroidPlugin来说，眼下还存在一下几种不足和缺点：

无法在插件中发送具有自己定义资源的Notification，比如： a. 带自己定义RemoteLayout的Notification b.

图标通过R.drawable.XXX指定的通知（插件系统会自己主动将其转化为Bitmap）
无法在插件中注冊一些具有特殊Intent
Filter的Service、Activity、BroadcastReceiver、ContentProvider等组件以供Android系统、已经安装的其它APP调用。
对Activity的LaunchMode支持不够好，Activity
Stack管理存在一定缺陷。

Activity的onNewIntent函数可能不会被触发。

（此为BUG，未来会修复）
缺乏对Native层的Hook。对某些带native代码的apk支持不好，可能无法执行。比方一部分游戏（cocos2d、unity3d开发的游戏预计都用不了）无法当作插件执行。

当然，看我说的再多。也仅仅是我的个人理解。有兴趣的同学，直接去github clone一份代码阅读阅读吧。

github地址为： https://github.com/Qihoo360/DroidPlugin

时间： 2024-04-25 08:12:48

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转载:http://lruheng.com/2017/07/01/Android%E6%8F%92%E4%BB%B6%E5%8C%96%E5%85%A5%E9%97%A8%E6%8C%87%E5%8D%97/ 一.Android插件化介绍 1.含义所谓插件化,就是让我们的应用不必再像原来一样把所有的内容都放在一个apk中,可以把一些功能和逻辑单独抽出来放在插件apk中,然后主apk做到［按需调用］,这样的好处是一来可以减少主apk的体积,让应用更轻便,二来可以做到热插拔,更加动态化. 2.背景