1. 新建assets目录：
https://blog.csdn.net/qq_26585943/article/details/53885627
2. NCNN使用assets:
https://zhuanlan.zhihu.com/p/137453394
https://github.com/Arctanxy/DeepLearningDeployment/blob/master/SimplestNCNNExample/app/src/main/java/com/example/simplestncnnexample/MainActivity.java
3. assets文件访问：
https://www.cnblogs.com/willhua/p/9692529.html