Alibaba-Dexposed框架在线热补丁修复的使用

目录(?)[+]

前两篇已经介绍了alibaba的AndFix热修复：

Alibaba-AndFix Bug热修复框架的使用

Alibaba-AndFix Bug热修复框架原理及源码解析
DexPosed是Alibaba的另一个框架，都可以在线热修复bug，只不过DexPosed也可以实现其他的功能。

DexPosed

介绍
应用场景
在Android上的使用

在自定义Application初始化

patch文件的生成
支持的系统

DexPosed

介绍

DexPosed是强大而无侵入的AOP（面向切面编程）运行Android应用程序开发框架，基于开源的Xposed框架项目的工作（Xposed是修改系统框架服务的框架）。

Github : https://github.com/alibaba/dexposed

应用场景

AOP编程

仪表（用于测试，性能监测等）

在线热补丁修复

SDK hooking(钩)以提供更好的开发体验

在Android上的使用

Android Studio中使用：

在Gradle中添加：

<code class="hljs nginx 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-title" style="color:#0088;box-sizing: border-box;">dependencies</span> {
<span class="hljs-title" style="color:#0088;box-sizing: border-box;">compile</span> <span class="hljs-string" style="color:#0880;box-sizing: border-box;">'com.taobao.android:dexposed:0.1.1<span class="hljs-variable" style="color:#66066;box-sizing: border-box;">@aar</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></ul>

在libs中加入：dexposedbridge.jar、patchloader.jar包。

需要添加的so文件有：libdexposed.so、libdexposed_1.so。

在自定义Application初始化

<code class="hljs lasso 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:#0088;box-sizing: border-box;">if</span> (DexposedBridge<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>canDexposed(this)) {<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//判断系统是否支持DexPosed</span>
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"APP"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"true application"</span>);
} <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> {
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"APP"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"false application"</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></ul>

当收到服务器推送消息，需要下载patch文件，下载完成后即时加载来修复bug。

PatchResult result = PatchMain.load(this, “patch apk文件的路径”, null);

<code class="hljs lasso 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-comment" style="color:#8800;box-sizing: border-box;">//加载patch apk文件</span>
PatchResult result <span class="hljs-subst" style="color:#000000;box-sizing: border-box;">=</span> PatchMain<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>load(this, fullpath, <span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">null</span>);
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (result<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>isSuccess()) {
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"Hotpatch"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"patch success!"</span>);
} <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> {
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">Log</span><span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"Hotpatch"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"patch error is "</span> <span class="hljs-subst" style="color:#000000;box-sizing: border-box;">+</span> result<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>getErrorInfo());
}</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></ul>

//注：patch apk 文件不能放在共享目录中，建议放在cache文件中。

在应用升级之前需每次load加载patch apk，当应用升级后把patch apk进行清空。

PatchMain.load加载patch apk，会遍历apk中实现IPatch接口的所有,并hook对应的方法对象。

patch文件的生成

新创建一个项目MyPatch，并在libs中加入dexposedbridge.jar、patchloader.jar包。

在build.gradle设置jar为provided，如下：

<code class="hljs livecodeserver 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;">dependencies {
provided <span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">files</span>(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">'libs/dexposedbridge.jar'</span>)
provided <span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">files</span>(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">'libs/patchloader.jar'</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></ul>

如果想修复一个bug，需在MyPatch中创建一个类，并实现IPatch接口，实现handlePatch方法。
接下的Demo是想在bug方法的前后做一些处理，也可以终止bug方法的调用及修改bug方法的参数：

<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:#0088;box-sizing: border-box;">package</span> com.open.cool.patch;

<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> android.util.Log;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> android.view.View;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> android.widget.Toast;

<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> com.taobao.android.dexposed.DexposedBridge;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> com.taobao.android.dexposed.XC_MethodHook;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> com.taobao.patch.IPatch;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> com.taobao.patch.PatchParam;

<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//必须实现IPatch接口</span>
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">class</span> <span class="hljs-title" style="color:#66066;box-sizing: border-box;">MyPatch</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">implements</span> <span class="hljs-title" style="color:#66066;box-sizing: border-box;">IPatch</span> {</span>

<span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">handlePatch</span>(<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">final</span> PatchParam arg0) <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">throws</span> Throwable {
Class<?> cls = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">try</span> {
<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//使用类加载器获取需要修复的方法所在的类Class</span>
cls = arg0.context.getClassLoader()
.loadClass(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"com.open.cool.mydex1.MainActivity"</span>);
} <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">catch</span> (ClassNotFoundException e) {
e.printStackTrace();
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">return</span>;
}
<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//hook想要操作的方法，在方法前后做一些处理，XC_MethodHook</span>
<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//cls上边获取到的，这里的test1是有bug的方法名称，View.class是test1的参数类型，如果有多个参数就依次在后边添加View.class,Object.class,Object.class等。</span>
DexposedBridge.findAndHookMethod(cls, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"test1"</span>, View.class,
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> XC_MethodHook() {
<span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">beforeHookedMethod</span>(MethodHookParam param) <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">throws</span> Throwable {
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">super</span>.beforeHookedMethod(param);
Log.e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"IPatch"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"beforeHookedMethod"</span>);
<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//TODO 调用hook方法前的操作</span>
Toast.makeText(arg0.context, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"before"</span>, Toast.LENGTH_SHORT).show();

<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//                           param.setResult(null);//禁止调用原方法</span>
}

<span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">afterHookedMethod</span>(MethodHookParam param) <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">throws</span> Throwable {
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">super</span>.afterHookedMethod(param);
<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//TODO 调用hook方法后的操作</span>

Log.e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"IPatch"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"afterHookedMethod"</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></ul>

下面的Demo是直接替换掉bug方法：

<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:#0088;box-sizing: border-box;">package</span> com.open.cool.patch;

<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> android.util.Log;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> android.view.View;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> android.widget.Toast;

<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> com.taobao.android.dexposed.DexposedBridge;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> com.taobao.android.dexposed.XC_MethodHook;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> com.taobao.android.dexposed.XC_MethodReplacement;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> com.taobao.patch.IPatch;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">import</span> com.taobao.patch.PatchParam;

<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//必须实现IPatch接口</span>
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">class</span> <span class="hljs-title" style="color:#66066;box-sizing: border-box;">MyPatch</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">implements</span> <span class="hljs-title" style="color:#66066;box-sizing: border-box;">IPatch</span> {</span>

<span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">handlePatch</span>(<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">final</span> PatchParam arg0) <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">throws</span> Throwable {
Class<?> cls = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>;
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">try</span> {
<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//使用类加载器获取指定的类Class</span>
cls = arg0.context.getClassLoader()
.loadClass(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"com.open.cool.mydex1.MainActivity"</span>);
} <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">catch</span> (ClassNotFoundException e) {
e.printStackTrace();
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">return</span>;
}
<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//        //替换hook方法中的方法实现，XC_MethodReplacement</span>
DexposedBridge.findAndHookMethod(cls, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"test1"</span>, View.class, <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> XC_MethodReplacement() {
<span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">protected</span> Object <span class="hljs-title" style="box-sizing: border-box;">replaceHookedMethod</span>(XC_MethodHook.MethodHookParam methodHookParam) <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">throws</span> Throwable {

<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//TODO 替换后的方法实现</span>
<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//.....</span>

<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</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></ul>

上面2个Demo两者的区别是：回调接口的类不同(XC_MethodHook和XC_MethodReplacement);

//XC_MethodHook是XC_MethodReplacement的基类。
把MyPatch项目打包生成补丁apk文件，服务器通知客户端下载补丁文件apk，并使用

<code class="hljs sql 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;">PatchResult result = PatchMain.<span class="hljs-operator" style="box-sizing: border-box;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">load</span>(this, “patch apk文件的路径”, <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</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></ul>

加载补丁apk，即时修复bug方法。
如果项目有代码混淆：

需注意的部分

<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;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">cls</span> = arg0<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.context</span><span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.getClassLoader</span>()
<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.loadClass</span>(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"packageName+className"</span>)<span class="hljs-comment" style="color:#8800;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></ul>

packageName+className必须是混淆后的类名和方法名称。
在打release包时，在build/outputs/mapping/release/下面有mapping.txt，这个里面记录了混淆以前的类和混淆以后的类的一一对应关系（所以叫mapping.txt)，所以每次发版以后要保留好mapping.txt文件，以便以后编写Patch。
原文地址：　http://blog.csdn.net/qxs965266509/article/details/49821413

支持的系统

Runtime	Android Version	Support
Dalvik	2.2	Not Test
Dalvik	2.3	Yes
Dalvik	3.0	No
Dalvik	4.0-4.4	Yes
ART	5.0	Testing
ART	5.1	No
ART	M	No

注意：android4.4之后的版本都用Art取代了Dalvik,所以要hook Android4.4以后的版本就必须去适配Art虚拟机的机制。目前官方表示，为了适配Art的dexposed_l只是beta版，所以最好不要在正式的线上产品中使用它。