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116 lines
2.9 KiB
116 lines
2.9 KiB
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "simplejni native.cpp"
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#include <android/log.h>
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#include <stdio.h>
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#include "jni.h"
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#define ALOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, LOG_TAG, __VA_ARGS__)
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#define ALOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)
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#define ALOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
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#define ALOGW(...) __android_log_print(ANDROID_LOG_WARN, LOG_TAG, __VA_ARGS__)
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#define ALOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
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static jint
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add(JNIEnv* /*env*/, jobject /*thiz*/, jint a, jint b) {
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int result = a + b;
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ALOGI("%d + %d = %d", a, b, result);
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return result;
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}
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static const char *classPathName = "com/example/android/simplejni/Native";
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static JNINativeMethod methods[] = {
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{"add", "(II)I", (void*)add },
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};
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/*
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* Register several native methods for one class.
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*/
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static int registerNativeMethods(JNIEnv* env, const char* className,
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JNINativeMethod* gMethods, int numMethods)
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{
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jclass clazz;
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clazz = env->FindClass(className);
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if (clazz == NULL) {
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ALOGE("Native registration unable to find class '%s'", className);
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return JNI_FALSE;
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}
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if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
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ALOGE("RegisterNatives failed for '%s'", className);
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return JNI_FALSE;
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}
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return JNI_TRUE;
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}
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/*
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* Register native methods for all classes we know about.
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*
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* returns JNI_TRUE on success.
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*/
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static int registerNatives(JNIEnv* env)
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{
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if (!registerNativeMethods(env, classPathName,
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methods, sizeof(methods) / sizeof(methods[0]))) {
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return JNI_FALSE;
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}
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return JNI_TRUE;
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}
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// ----------------------------------------------------------------------------
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/*
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* This is called by the VM when the shared library is first loaded.
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*/
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typedef union {
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JNIEnv* env;
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void* venv;
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} UnionJNIEnvToVoid;
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jint JNI_OnLoad(JavaVM* vm, void* /*reserved*/)
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{
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UnionJNIEnvToVoid uenv;
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uenv.venv = NULL;
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jint result = -1;
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JNIEnv* env = NULL;
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ALOGI("JNI_OnLoad");
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if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_4) != JNI_OK) {
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ALOGE("ERROR: GetEnv failed");
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goto bail;
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}
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env = uenv.env;
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if (registerNatives(env) != JNI_TRUE) {
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ALOGE("ERROR: registerNatives failed");
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goto bail;
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}
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result = JNI_VERSION_1_4;
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bail:
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return result;
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}
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