微信Android SDK反编译还原源码 进行修改重新编译

一、介绍

微信sdk，做开发的都应该用过，微信分享、支付，都要用到的。

接下来，跟着我，把他的sdk源码还原为一个module可编译的形式。

用到的工具：

• jadx: 这是一款反编译apk和jar包的工具，下载地址点我
• jeb: 这也是一款查看apk源码的工具，下载地址点我
• Android Studio

二、过程

2.1 下载微信Android sdk的jar包

下载页面

我用的方法是，gradle依赖，然后把jar拿出来，我用的是没有统计功能的包。

2.2 jadx另存

打开jadx，打开微信的Android sdk jar包，File -> Save as gradle project

保存出来到一个文件夹，看到src目录和builde.gradle文件。 我保存为wx文件夹。

2.3 Android Stuido导入

修改build.gradle文件为如下：

apply plugin: 'com.android.library'android {    //这连个版本看你安装的sdk    compileSdkVersion 23    buildToolsVersion '25.0.0'    lintOptions{        abortOnError  false    }    defaultConfig {        minSdkVersion 12        targetSdkVersion 21        versionCode 1        versionName "1.0"    }}
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打开Android Studio，新建一个Project，然后File -> import Module，选择刚刚保存出来的文件夹。

然后会出现一些问题，我们来慢慢解决

build tool版本问题

点击第一个update即可。

Cannot read packageName问题

切换到Project视图，在main文件夹下新建AndroidManifest.xml文件，内容为以下：

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.tencent.mm.opensdk">    <application android:allowBackup="true" android:supportsRtl="true"/></manifest>
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然后，Build -> Make Module ‘xx’

然后你会看到一堆报错

2.4 解决代码错误

到了上一步骤的Make Module之后会看到下面的一堆错误，我们一步步解决

双击第一个错误，定位到了com.tencent.mm.opensdk.channel.a这个文件。原因是因为外部类和内部类名字相同冲突了。

那把一个类改名呗，好咧。 按住ctrl+鼠标左键 点击内部类a，可以看到有什么方法引用了这个类，这个内部类改了，也要把这些引用给改了。

我们把内部类改为ABean，添加无参数构造器，然后把那些引用给改了。继续编译

接着提示：Error:(15, 14) 错误: d不是抽象的, 并且未覆盖AsyncTask中的抽象方法doInBackground(Void…)，双击进去看到是com.tencent.mm.opensdk.diffdev.a.b 这个类报错。好，接下来祭出另外的杀器：jeb。

2.5 使用jeb

新建一个项目，依赖微信的sdk，编译成一个apk

dependencies {   compile 'com.tencent.mm.opensdk:wechat-sdk-android-with-mta:+'}
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然后打开jeb，打开这个apk，打开Bytecode，查看微信sdk的源码(com.tencent.mm.opensdk)，打开上面报错的类： com.tencent.mm.opensdk.diffdev.a.d

对比jeb的源码，进行代码修改：删除泛型，修改doInBackground方法，修改a方法

f类也是一样修改，然后f方法会发现里面的内部类a没有反编译出来，ok，我们看jeb

把这段代码还原为java代码：

public static com.tencent.mm.opensdk.diffdev.a.f.a b(byte[] arg12) {            String v1_1;            long v8 = 6979321856L;            int v7 = 52;            a v0 = new a();            if(arg12 != null && arg12.length != 0) {                try {                    v1_1 = new String(arg12, "utf-8");                }                catch(Exception v1) {                    Log.e("MicroMsg.SDK.NoopingResult", String.format("parse fail, build String fail, ex = %s", v1.getMessage()));                    v0.o = OAuthErrCode.WechatAuth_Err_NormalErr;                    return v0;                }                try {                    JSONObject v2 = new JSONObject(v1_1);                    v0.x = v2.getInt("wx_errcode");                    Log.d("MicroMsg.SDK.NoopingResult", String.format("nooping uuidStatusCode = %d", Integer.valueOf(v0.x)));                    switch(v0.x) {                        case 402: {                            v0.o = OAuthErrCode.WechatAuth_Err_Timeout;                        }                        case 403: {                            v0.o = OAuthErrCode.WechatAuth_Err_Cancel;                            v0.o = OAuthErrCode.WechatAuth_Err_NormalErr;                            return v0;                        }                        case 404: {                            v0.o = OAuthErrCode.WechatAuth_Err_OK;                        }                        case 405: {                            v0.o = OAuthErrCode.WechatAuth_Err_OK;                            v0.w = v2.getString("wx_code");                        }                        case 408: {                            v0.o = OAuthErrCode.WechatAuth_Err_OK;                        }                        case 500: {                            v0.o = OAuthErrCode.WechatAuth_Err_NormalErr;                        }                        default: {                            v0.o = OAuthErrCode.WechatAuth_Err_NormalErr;                        }                    }                }                catch(Exception v1) {                    v1.printStackTrace();                }            }            else {                Log.e("MicroMsg.SDK.NoopingResult", "parse fail, buf is null");                v0.o = OAuthErrCode.WechatAuth_Err_NetworkErr;            }            return v0;        }
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接下来到com.tencent.mm.opensdk.diffdev.a.b这个类。a类里面的变量改为public即可

接下来到com.tencent.mm.opensdk.diffdev.a.e这个类，提示Error:(4, 23) 错误: 程序包org.apache.http不存在

这个问题是因为没有导入http包导致的，在build.grdle里面的android标签添加下面的代码即可解决。继续编译

    useLibrary 'org.apache.http.legacy'
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然后在com.tencent.mm.opensdk.diffdev.a.a这个文件中报错：

Error:(42, 68) 警告: 最后一个参数使用了不准确的变量类型的 varargs 方法的非 varargs 调用;对于 varargs 调用, 应使用 Object对于非 varargs 调用, 应使用 Object[], 这样也可以抑制此警告
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这个把参数new Void[0]删除即可。

然后在com.tencent.mm.opensdk.diffdev.a.e这个文件中报错：

Error:(31, 61) 错误: 未报告的异常错误IOException; 必须对其进行捕获或声明以便抛出
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添加异常捕捉即可

HttpResponse execute = null;try {    execute = defaultHttpClient.execute(httpGet);    if (execute.getStatusLine().getStatusCode() != 200) {        Log.e("MicroMsg.SDK.NetUtil", "httpGet fail, status code = " + execute.getStatusLine().getStatusCode());    } else {        bArr = EntityUtils.toByteArray(execute.getEntity());    }} catch (IOException e) {    e.printStackTrace();}
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然后在com.tencent.mm.opensdk.modelmsg.WXMediaMessage这个类中报错：

Error:(183, 51) 错误: 找不到符号符号:   方法 toByteArray()位置: 类型为OutputStream的变量 byteArrayOutputStream
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修改OutputStream为ByteArrayOutputStream

然后在com.tencent.mm.opensdk.openapi.MMSharedPreferences报错：

Error:(140, 47) 错误: 找不到符号符号:   方法 a(int,String)位置: 类型为Object的变量 a
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在jeb查看，可以看到a类是util包下面的c文件里面的a内部类，我们把a.a改为c.a.a，导入util目录下c的包 即可。

然后在com.tencent.mm.opensdk.openapi.WXApiImplV10报错:

Error:(92, 33) 错误: 无法将类 Resp中的构造器 Resp应用到给定类型;需要: Bundle找到: 没有参数原因: 实际参数列表和形式参数列表长度不同
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把BaseResp改为Resp，然后Resp类，添加一个无参数的构造方法。

Error:(143, 308) 错误: 不兼容的类型: int无法转换为String
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添加String.valueOf()方法即可

Error:(277, 45) 错误: 找不到符号符号:   变量 message位置: 类型为BaseReq的变量 req
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req改为： ShowMessageFromWX.Req req = new ShowMessageFromWX.Req(intent.getExtras());

Error:(445, 52) 错误: 无法将类 WXWebpageObject中的构造器 WXWebpageObject应用到给定类型;需要: String找到: 没有参数原因: 实际参数列表和形式参数列表长度不同
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IMediaObject修改为WXWebpageObject，WXWebpageObject类里面添加无参数的构造方法

ok。基本修改完毕，再把build.gradle里面minSdkVersion修改为12，重新Make Module即可。

三、生成新的jar包

在源码module的build.gradle底部添加代码:

task makeJar(type: Copy) {    delete 'build/libs/test.jar'    from('build/intermediates/bundles/debug/')    into('build/libs/')    include('classes.jar')    rename('classes.jar', 'weixinsdk.jar')}makeJar.dependsOn(build)
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然后在右边Gradle，:xx Module名称 -> other -> makeJar 右键run。 即可在build/libs看到weixinsdk.jar这个就是根据你的源码编译出来的新的微信jar包。 

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