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#define LOG_TAG "libJniCal native.cpp"
#include <utils/Log.h>
#include <stdio.h>
#include "jni.h"
#include "../libcal/Cal.h"
static jint
cal_service_add(JNIEnv *env, jobject thiz, jint a, jint b)
{
android::Cal cal;
int result = cal.Add(a, b);
LOGI("%d + %d = %d", a, b, result);
return result;
}
static jint
cal_service_sub(JNIEnv *env, jobject thiz, jint a, jint b)
{
android::Cal cal;
int result = cal.Sub(a, b);
LOGI("%d - %d = %d", a, b, result);
return result;
}
static jint
cal_service_mul(JNIEnv *env, jobject thiz, jint a, jint b)
{
android::Cal cal;
int result = cal.Mul(a, b);
LOGI("%d * %d = %d", a, b, result);
return result;
}
static jfloat
cal_service_div(JNIEnv *env, jobject thiz, jint a, jint b)
{
android::Cal cal;
float result = cal.Div(a, b);
LOGI("%d / %d = %f", a, b, result);
return result;
}
static const char *classPathName = "com/example/android/simpleservice/Native";/*应用程序中所对应类的地址，这里错了很多次*/
static JNINativeMethod methods[] = {
{"add", "(II)I", (void*)cal_service_add },
{"sub", "(II)I", (void*)cal_service_sub },
{"mul", "(II)I", (void*)cal_service_mul },
{"div", "(II)F", (void*)cal_service_div },
};
/*
* Register several native methods for one class.
*/
static int registerNativeMethods(JNIEnv* env, const char* className,
JNINativeMethod* gMethods, int numMethods)
{
jclass clazz;
clazz = env->FindClass(className);
if (clazz == NULL) {
LOGE("Native registration unable to find class '%s'", className);
return JNI_FALSE;
}
if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
LOGE("RegisterNatives failed for '%s'", className);
return JNI_FALSE;
}
return JNI_TRUE;
}
/*
* Register native methods for all classes we know about.
*
* returns JNI_TRUE on success.
*/
static int registerNatives(JNIEnv* env)
{
if (!registerNativeMethods(env, classPathName,
methods, sizeof(methods) / sizeof(methods[0]))) {
return JNI_FALSE;
}
return JNI_TRUE;
}
----------------------------------------------------------------------------
/*
* This is called by the VM when the shared library is first loaded.
*/
typedef union {
JNIEnv* env;
void* venv;
} UnionJNIEnvToVoid;
jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
UnionJNIEnvToVoid uenv;
uenv.venv = NULL;
jint result = -1;
JNIEnv* env = NULL;
LOGI("JNI_OnLoad");
if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_4) != JNI_OK) {
LOGE("ERROR: GetEnv failed");
goto fail;
}
env = uenv.env;
if (registerNatives(env) != JNI_TRUE) {
LOGE("ERROR: registerNatives failed");
goto fail;
}
LOGI("JNI_OnLoad Done");
result = JNI_VERSION_1_4;
fail:
return result;
}
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