Sample Syntax Declaration for NDK

Getting Static String from JNI

              env->NewStringUTF("I am back with string!");

Access Fields Declared in java class (public float[] VertexCoords;)

1. jclass cls = env->GetObjectClass(obj); //obj is the object of java class

2. jfieldID fieldId = env->GetFieldID(cls, "VertexCoords", "[F");

                     // VertexCoords is the name of variable defined in java

                    // [F defines the type of variable it is array float

3. jobject objArray = env->GetObjectField (obj, fieldId);

                 // Take the field in jobject.

4. jfloatArray* fArray = reinterpret_cast<jfloatArray*>(&objArray);

               // Cast it to jfloatArray

5. jsize len = env->GetArrayLength(*fArray);

             //get the length of float array

6. float* data = env->GetFloatArrayElements(*fArray, 0);

            //get all data

after getting data perform the task according to your requirements

7. env->ReleaseFloatArrayElements(*fArray, data, 0);

          //Dont forget to release the pointer array

   

Access Methods Declared in java class (public int getFacetCount(){})

     jclass cls = env->GetObjectClass(obj);

    jmethodID methodId = env->GetMethodID(cls, "getFacetCount", "()I");

    int result = env->CallIntMethod(obj, methodId);