学习jni及反调试策略
结合反射一起学习NDK
###反射四步（代码位置MainActivity.class & ReflectionModel.class）
1.拿class
2.拿field/method
3.设置可见性setAccess
4.调用set修改field/invoke调用method
###jni调java三步(代码位置ctest.cpp)
1.FindClass拿class
2.拿GetMethodId/GetMethodId
3.调用GetField/GetField
jni调java最需要注意的就是c++和java的类型变换
###jni动态注册/轮询反调试（代码位置ccheck.cpp)
1.复写jni_OnLoad方法
2.创建子线程读取proc/[pid]/status文件下的traceid值
###安全检查（代码位置SecurityCheckUtils.class）
1.检查签名；
2.检查debug属性；
3.检查root；
4.检查xp框架；
5.检查端口
###详细见
经过分析后发现，是check中发现当前签名不对，导致的。
原因：因为其他下载这个demo之后，打包的签名肯定和作者不一样的。所以签名肯定不对。
要对这个位置修改，先注释，或者写入自己当前签名就行。
ccheck.cpp：159行
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