JNI & NDK

• JNI (Java Native Interface), Java Native Interface, so Java and other local languages ​​(C / C ++) interaction, JNI is the Java language features, and not directly related to Android;

• NDK (Native Development Kit), a development toolkit Android, rapid development of C / C ++ DLL, and the application and automatically packaged into SO APK, NDK Android belongs, not directly related to Java;

• When cross compiler Android C / C ++ libraries, tools required NDK compiling chain, chain 64 NDK tool comprising:
  1. aarch64-linux-android-gcc
  2. aarch64-linux-android-g++
  3. aarch64-linux-android-ar database management tool
  4. aarch64-linux-android-as Assembler
  5. aarch64-linux-android-ld linker
  6. ndk-gdb

If you want to make C / C ++ executable or DLL can run on the Android operating system, use NDK toolchain to compile, assemble, link.
Aarch64-Android Linux-gcc-represented aarch64 architecture -Linux operating system kernel -Android correspondence the gcc