how c/c++ call java method in android by jni

ndk_c_call_java_method

#include "com_jiezhi_jnitest_MainActivity.h"

jclass mClass;
jobject mObject;
jmethodID mStaticmethodID, mnotStaticMethodID;

/*
 * Class:     com_jiezhi_jnitest_MainActivity
 * Method:    nativeInit
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_com_jiezhi_jnitest_MainActivity_nativeInit(
		JNIEnv *env, jobject thiz)
{
	jclass clazz = env->GetObjectClass(thiz);
	mClass = (jclass) env->NewGlobalRef(clazz);
	mObject = (jobject) env->NewGlobalRef(thiz);
	mStaticmethodID = env->GetStaticMethodID(mClass,
			"setStaticMethodByNativeCode", "(I)V");
	mnotStaticMethodID = env->GetMethodID(mClass, "setMethodByNativeCode",
			"(I)V");

}

/*
 * Class:     com_jiezhi_jnitest_MainActivity
 * Method:    stringFromJni
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_com_jiezhi_jnitest_MainActivity_nativeExecution(
		JNIEnv *env, jobject thiz)
{
	env->CallVoidMethod(mObject, mnotStaticMethodID, 100);
}

/*
 * Class:     com_jiezhi_jnitest_MainActivity
 * Method:    nativeBusiness
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_com_jiezhi_jnitest_MainActivity_nativeStaticExecution(
		JNIEnv *env, jobject thiz)
{
	env->CallVoidMethod(mObject, mStaticmethodID, 200);
}