1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "SplitApp" 18 19 #include <android/log.h> 20 #include <stdio.h> 21 22 #include "jni.h" 23 24 #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__) 25 #define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__) 26 27 28 static jint add(JNIEnv *env, jobject thiz, jint a, jint b) { 29 int result = a + b; 30 LOGI("%d + %d = %d", a, b, result); 31 return result; 32 } 33 34 static jstring arch(JNIEnv *env, jobject thiz) { 35 return env->NewStringUTF(__ANDROID_ARCH__); 36 } 37 38 static const char *classPathName = "com/android/cts/splitapp/Native"; 39 40 static JNINativeMethod methods[] = { 41 {"add", "(II)I", (void*)add }, 42 {"arch", "()Ljava/lang/String;", (void*)arch }, 43 }; 44 45 static int registerNativeMethods(JNIEnv* env, const char* className, JNINativeMethod* gMethods, int numMethods) { 46 jclass clazz; 47 48 clazz = env->FindClass(className); 49 if (clazz == NULL) { 50 LOGE("Native registration unable to find class '%s'", className); 51 return JNI_FALSE; 52 } 53 if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) { 54 LOGE("RegisterNatives failed for '%s'", className); 55 return JNI_FALSE; 56 } 57 58 return JNI_TRUE; 59 } 60 61 static int registerNatives(JNIEnv* env) { 62 if (!registerNativeMethods(env, classPathName, methods, sizeof(methods) / sizeof(methods[0]))) { 63 return JNI_FALSE; 64 } 65 66 return JNI_TRUE; 67 } 68 69 typedef union { 70 JNIEnv* env; 71 void* venv; 72 } UnionJNIEnvToVoid; 73 74 jint JNI_OnLoad(JavaVM* vm, void* reserved) { 75 UnionJNIEnvToVoid uenv; 76 uenv.venv = NULL; 77 jint result = -1; 78 JNIEnv* env = NULL; 79 80 LOGI("JNI_OnLoad"); 81 82 if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_4) != JNI_OK) { 83 LOGE("ERROR: GetEnv failed"); 84 goto bail; 85 } 86 env = uenv.env; 87 88 if (registerNatives(env) != JNI_TRUE) { 89 LOGE("ERROR: registerNatives failed"); 90 goto bail; 91 } 92 93 result = JNI_VERSION_1_4; 94 95 bail: 96 return result; 97 } 98