java - JNI UnsatisfiedLinkError - 未找到 native 方法

Question

我尝试在 Android 中使用 JNI，但一直收到“UnsatisfiedLinkError - Native method not found”。我花了几个小时寻找解决方案，但仍然遇到问题。感谢您的帮助。

我的代码如下:

Java 类:

package com.example.icam;

public class Native {
    static{
        System.loadLibrary("nativeLib");
    }
    public static native int nativeFunction();
}

头文件(使用javah生成):

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_example_icam_Native */

#ifndef _Included_com_example_icam_Native
#define _Included_com_example_icam_Native
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     com_example_icam_Native
 * Method:    nativeFunction
 * Signature: ()I
 */
JNIEXPORT jint JNICALL Java_com_example_icam_Native_nativeFunction
  (JNIEnv *, jclass);

#ifdef __cplusplus
}
#endif
#endif

C++ 源文件:

#include "com_example_icam_Native.h"

JNIEXPORT jint JNICALL Java_com_example_icam_Native_nativeFunction(JNIEnv * env, jclass clazz){
    return (jint)1;
}

我的Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on
#OPENCV_LIB_TYPE:=SHARED
APP_ABI := armeabi-v7a
LOCAL_SRC_FILES  := native.cpp

include C:\OpenCV-2.4.8-android-sdk\sdk\native\jni\OpenCV.mk
LOCAL_LDLIBS     += -llog -ldl

LOCAL_MODULE     := nativeLib

include $(BUILD_SHARED_LIBRARY)

我是 JNI 的新手，也许我遗漏了什么？

错误信息:

02-14 03:44:37.501: E/AndroidRuntime(23484): java.lang.UnsatisfiedLinkError: Native method not found: com.example.icam.Native.nativeFunction:()I
02-14 03:44:37.501: E/AndroidRuntime(23484):    at com.example.icam.Native.nativeFunction(Native Method)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at com.example.icam.MainActivity.onCreate(MainActivity.java:81)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at android.app.Activity.performCreate(Activity.java:5231)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at android.app.ActivityThread.access$800(ActivityThread.java:135)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at android.os.Handler.dispatchMessage(Handler.java:102)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at android.os.Looper.loop(Looper.java:136)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at android.app.ActivityThread.main(ActivityThread.java:5017)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at java.lang.reflect.Method.invokeNative(Native Method)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at java.lang.reflect.Method.invoke(Method.java:515)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-14 03:44:37.501: E/AndroidRuntime(23484):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

.c 文件中声明的函数不是 .h 文件中声明的函数，也不是 Java 代码中的本地方法。您更改了沿线某处的名称，但没有使所有内容保持同步。