环信初始化异常：java.lang.ClassNotFoundException: com.xiaomi.mipush.sdk.MiPushClient

问题描述：
环信版本2.0，在华为P6机器调测通过可以运行，换了mate7之后，出现上面的异常，做了以下的排查工作：
1.包内的method总数小于65535，大概在50000左右，基本上排除multiDex问题；
2.在混淆文件中增加-keep class com.xiaomi.mipush.sdk.MiPushClient ，不管用；
3.在华为P6（android4.4，api19）不出现，能够起到，换了mate7（android6，api23）问题必现；
5.异常调用栈：
java.lang.ClassNotFoundException: com.xiaomi.mipush.sdk.MiPushClient
    at java.lang.Class.classForName(Native Method)
    at java.lang.Class.forName(Class.java:324)
    at java.lang.Class.forName(Class.java:285)
    at com.easemob.chat.EMPushNotificationHelper.checkAvailablePushServ
    at com.easemob.chat.EMSessionManager.loginSync(Unknown Source)
    at com.easemob.chat.EMSessionManager.access$0(Unknown Source)
    at com.easemob.chat.EMSessionManager$1.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.xia
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.ja
    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
    ... 7 more
    Suppressed: java.lang.ClassNotFoundException: com.xiaomi.mipush.sdk.
    at java.lang.Class.classForName(Native Method)
    at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
    at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
        ... 8 more
    Caused by: java.lang.NoClassDefFoundError: Class not found using the
 memoryCache() and memoryCacheSize() calls overlap each other
 diskCache(), diskCacheSize() and diskCacheFileCount calls overlap each
 diskCache() and diskCacheFileNameGenerator() calls overlap each other
4. 怀疑是环信的初始化没有成功导致，对比p6和mate7启动logcat过程，mate7缺失下面的打印信息(P6启动信息)，从下面信息看出P6中也找不到xiaomi的类，但不报异常，所以怀疑是环信初始化失败：
D/EaseMob: easemob init in process:31084
D/EaseMob: passed userName : null
D/EaseMob: is autoLogin : true
D/EaseMob: lastLoginUser : 11293476
D/EMDBManager: initDB : 11293476
D/EaseMob: HuanXin SDK is initialized with version : 2.2.5
D/HXSDKHelper: initialize EMChat SDK
D/HXSDKHelper: init HuanXin Options
D/group: group manager clear
D/HXSDKHelper: init listener
D/EMDBManager: created chatdb for :11293476
I/dalvikvm: Could not find method Could not find method com.google.android.gms.common.GooglePlayServicesUtil.isGooglePlayServicesAvailable, referenced from method com.easemob.chat.EMPushNotificationHelper.checkAvailablePushService
VFY: unable to resolve static method 34845: Lcom/google/android/gms/common/GooglePlayServicesUtil;.isGooglePlayServicesAvailable (Landroid/content/Context;)I
VFY: replacing opcode 0x71 at 0x003b
Could not find method com.xiaomi.mipush.sdk.MiPushClient.shouldUseMIUIPush, referenced from method com.easemob.chat.EMPushNotificationHelper.checkAvailablePushService
VFY: unable to resolve static method 42079: Lcom/xiaomi/mipush/sdk/MiPushClient;.shouldUseMIUIPush (Landroid/content/Context;)Z
VFY: replacing opcode 0x71 at 0x008f
0916进展：
华为P6上面也出现该异常，位置比较靠下，但没有报process stopped due to unexpected signal 13。