JNI support for C + + and C differences

1. The code suffix for C + + is ". cpp"

2. There are two sets of code in the JNI.h file. One is to support C, and the other is to support JNI.

Jni. H Address:mac? user? Douj? Documents? ANDROID-NDK-R10B? Platforms? Android-8?

The code for C in JNI is:

Jstring (*newstringutf) (jnienv*, const Char*);

C in Call mode:

(*env)->newstringutf (env,"haha from c");

The code for C + + in JNI is:

jstring newstringutf (const char* bytes)

{ return Functions->newstringutf (this, bytes);}

How to call in C + +

jniexport jstring jnicall java_cn_itcast_cpp_demoactivity_helloinc   * env, Jobject obj) {     return      env->newstringutf ("haha from c" );}

3. Modify the Android.mk file

  Local_path: = $ (call My-dir)   include $ (clear_vars)   #针对C + + support, tag C + + file extension name   local_cpp_extension: = CPP      #打的包模块名称. The Libhello.so library is generated based on this.   local_module    : = Hello   local_src_files: = Hello.cpp #需要编译的相关C, C + + code   # Log Support   Local_ldlibs + =- Llog   include $ (build_shared_library)

4. Advantages of C + +

The function parameter names that are not required can be unnamed parameters.

JNI support for C + + and C differences