简书链接:多个dex合并遇到的问题
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合并使用到的技术

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    /**
     *
     * @param mainclassLoader 合并到这里
     * @param pluginClassloader 被合并的dex
     */



    public static void mergeDex(ClassLoader mainclassLoader,ClassLoader pluginClassloader){
    /*    String cachePath = context.getCacheDir().getAbsolutePath();
        String apkPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/plugin.apk";
        DexClassLoader pluginClassloader = new DexClassLoader(apkPath, cachePath, cachePath, context.getClassLoader());*/

        //     第一步   找到    插件的Elements数组  dexPathlist  ----？dexElement

        try {
//            Class myDexClazzLoader=pluginClassloader.getClass();
            Class myDexClazzLoader=Class.forName("dalvik.system.BaseDexClassLoader");
            Field myPathListFiled=myDexClazzLoader.getDeclaredField("pathList");
            myPathListFiled.setAccessible(true);
            Object myPathListObject =myPathListFiled.get(pluginClassloader);


            Class  myPathClazz=myPathListObject.getClass();
            Field  myElementsField = myPathClazz.getDeclaredField("dexElements");
            myElementsField.setAccessible(true);
//          自己插件的  dexElements[]
            Object myElements=myElementsField.get(myPathListObject);



            //     第二步   找到    main的Elements数组    dexElements
//            ClassLoader pathClassLoader=mainclassLoader;
            Class baseDexClazzLoader =Class.forName("dalvik.system.BaseDexClassLoader");
            Field pathListFiled = baseDexClazzLoader.getDeclaredField("pathList");
            pathListFiled.setAccessible(true);
            Object pathListObject = pathListFiled.get(mainclassLoader);
            Class systemPathClazz = pathListObject.getClass();
            Field systemElementsField = systemPathClazz.getDeclaredField("dexElements");
            systemElementsField.setAccessible(true);
            //系统的  dexElements[]
            Object systemElements = systemElementsField.get(pathListObject);
            //     第三步  上面的dexElements  数组  合并成新的  dexElements     然后通过反射重新注入系统的Field （dexElements ）变量中

//       新的     Element[] 对象
//            dalvik.system.Element

            int systemLength = Array.getLength(systemElements);
            int myLength = Array.getLength(myElements);
//            找到 Element  的Class类型   数组    每一个成员的类型
            Class<?> sigleElementClazz = systemElements.getClass().getComponentType();
            int newSysteLength = myLength + systemLength;
            Object newElementsArray=Array.newInstance(sigleElementClazz, newSysteLength);
//融合
            for (int i = 0; i < newSysteLength; i++) {
//                先融合 插件的Elements
                if (i < myLength) {
                    Array.set(newElementsArray, i, Array.get(myElements, i));
                }else {
                    Object value = Array.get(systemElements, i - myLength);
                    Array.set(newElementsArray,i, value);
                }
            }
            Field  elementsField=pathListObject.getClass().getDeclaredField("dexElements");;
            elementsField.setAccessible(true);
//            将新生成的EleMents数组对象重新放到系统中去
            elementsField.set( pathListObject,newElementsArray);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

问题汇总

Found duplicate classes, falling back to interpreter mode

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 11325-11325/cn.qssq666.pluginload W/IInputConnectionWrapper: reportFullscreenMode on inexistent InputConnection
05-12 19:29:21.841 11325-11325/cn.qssq666.pluginload V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@a035b2a
05-12 19:29:21.948 11325-11325/cn.qssq666.pluginload W/MainActivity: CLASSLOADER length12
05-12 19:29:22.310 11325-11325/cn.qssq666.pluginload W/MainActivity: 融合file：/data/user/0/cn.qssq666.pluginload/app_robot_out_dex/classes.dex
05-12 19:29:22.397 11325-11325/cn.qssq666.pluginload W/MainActivity: 融合file：/data/user/0/cn.qssq666.pluginload/app_robot_out_dex/classes2.dex
05-12 19:29:22.408 11325-11325/cn.qssq666.pluginload W/art: Found duplicate classes, falling back to interpreter mode for /data/user/0/cn.qssq666.pluginload/app_robot_out_dex/classes2.dex
    Found duplicated class when checking oat files: 'Lcom/umeng/analytics/pro/m$1;' in /data/app/cn.qssq666.redpacket-2/base.apk and /data/user/0/cn.qssq666.pluginload/app_robot_out_dex/classes2.dex
    Failure to verify dex file '/data/user/0/cn.qssq666.pluginload/app_robot_out_dex/classes2.dex': Bad file size (1788928, expected 1787988d)
05-12 19:29:22.418 11325-11325/cn.qssq666.pluginload E/System: Unable to load dex file: /data/user/0/cn.qssq666.pluginload/app_robot_out_dex/classes2.dex
05-12 19:29:22.419 11325-11325/cn.qssq666.pluginload E/System: java.io.IOException: Failed to open dex files from /data/user/0/cn.qssq666.pluginload/app_robot_out_dex/classes2.dex because: Failure to verify dex file '/data/user/0/cn.qssq666.pluginload/app_robot_out_dex/classes2.dex': Bad file size (1788928, expected 1787988d)
        at dalvik.system.DexFile.openDexFileNative(Native Method)

真正的错误原因

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W/art: Found duplicate classes, falling back to interpreter mode for /data/user/0/cn.qssq666.pluginload/app_robot_out
_dex/classes2.dex
       Found duplicated class when checking oat files: 
'Lcom/umeng/analytics/pro/m$1;' in /data/app/cn.qssq666.redpacket-2/
base.apk and /data/user/0/cn.qssq666.pluginload/app_robot_out_dex/
classes2.dex
Failure to verify dex file 
'/data/user/0/cn.qssq666.pluginload/app_robot_out_dex

这个问题是因为我的情迁红包插件apk，它给每一个apk都加入了友盟，里面使用到了友盟，结果也被加载进来了。那么这样的合并代码显然是有问题的，那么为什么xposed融合就没有问题呢？我直接不跟主classloader融合了。

问题2 LinkageError:No superclass defined for class

No superclass defined for class java.lang.Object(declartion of ''java.lang.Object") appears in /data/user/0/xxxxx/apk_robot_out/class.dex

忘记注意classloader为空了。

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 DexClassLoader currentClassloader = new DexClassLoader(
file.getAbsolutePath(), 
dataDir.getAbsolutePath(), 
packageInfo.applicationInfo.nativeLibraryDir, 
MainActivity.this.getClassLoader());