Simplest way to pass float[][] to C++ via JNI

Question

In my Java code I have a 2D float array float[x][4] floatArray. Here x can be between 1 and 25. I have to pass this 2D float array to a C++<

Answer 1

For releasing the allocated memory you can do something like this:

static void releaseMatrixArray(JNIEnv *env, jobjectArray matrix) {
int size = (*env)->GetArrayLength(env, matrix);
for (int i = 0; i < size; i++) {
    jfloatArray oneDim = (jfloatArray) (*env)->GetObjectArrayElement(env, matrix, i);
    jfloat *elements = (*env)->GetFloatArrayElements(env, oneDim, 0);

    (*env)->ReleaseFloatArrayElements(env, oneDim, elements, 0);
    (*env)->DeleteLocalRef(env, oneDim);
  }
}

release local Array reference:

free(localArray);