1. sourceSets {  
2.         main {  
3.             jni.srcDirs = [‘src/main/jni‘, ‘src/main/jni/‘]  
4.         }  
5.     }  
6.   
7.     externalNativeBuild {  
8.         ndkBuild {  
9.             path file("src\\main\\jni\\Android.mk")  
10.         }  
11.     }  

http://blog.csdn.net/u012527560/article/details/51752070

http://blog.csdn.net/langxm2006/article/details/53899638

ndk