java Android NDK应用程序抛出错误未满足链接错误

5 月 Questions & Answers 142

我正在开发基于NDK的Android应用程序。现在我正在学习使用示例“HelloWorld”应用程序。但它每次都会抛出错误请指出错误所在

注意：我所有的cpp文件都只在jni文件夹中

在LogCat中，调试时，它说

08-19 14:52:59.340: W/dalvikvm(469): No implementation found for native Lcom/example/myfirstndkapp/MainActivity;.concateneMyStringWithCppString (Ljava/lang/String;)Ljava/lang/String;

以下是基本代码：

主要活动。java

package com.example.myfirstndkapp;

import 安卓.support.v7.app.ActionBarActivity;

import 安卓.support.v4.app.Fragment;
import 安卓.os.Bundle;
import 安卓.view.*;

public class MainActivity extends ActionBarActivity {

    static {
        System.loadLibrary("MyFirstNDKApp");
        }

    private native String concateneMyStringWithCppString(String myString);

    private EditText tvGetValue = null;
    private TextView tvSetValue = null;
    private Button btnCallCPPMethod = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }

        String str = concateneMyStringWithCppString("OutputString");



        System.out.println("output : "+str);

        }
}

Android。mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE    := MyFirstNDKApp
LOCAL_SRC_FILES := CoreWrapper.cpp
LOCAL_SRC_FILES += Core.cpp
LOCAL_C_INCLUDES := $(LOCAL_PATH)
include $(BUILD_SHARED_LIBRARY)

应用程序。mk

APP_STL := gnustl_static
APP_ABI := all

核心。h和核心。cpp

//
//  Core.h
#ifndef __MyFistNDKApp__Core__
#define __MyFistNDKApp__Core__

#include <iostream>
const char* concateneMyStringWithCppString(const char* myString);
#endif /* defined(__MyFistNDKApp__Core__) */

//  Core.cpp

#include "Core.h"

const char* CPP_BASE_STRING = "cpp says hello world to %s";

const char* concateneMyStringWithCppString(const char* myString) {
    char* concatenedString = new char[strlen(CPP_BASE_STRING) + strlen(myString)];
    sprintf(concatenedString, CPP_BASE_STRING, myString);
    return concatenedString;
}

核心包装器。c

//  CoreWrapper.c

#include <string.h>
#include <jni.h>
#include "Core.h"

extern "C" {

JNIEXPORT jstring JNICALL com_example_myfirstndkapp_MainActivity_concateneMyStringWithCppString(JNIEnv* env, jobject thiz, jstring myString) {
    return env->NewStringUTF(concateneMyStringWithCppString(env->GetStringUTFChars(myString, 0)));
}

}

但在运行时，它在main活动中的以下行上抛出错误：concateneMyStringWithCppString。java甚至都不进去。上面写着一个未被识别的。以下是错误日志：

enter image description here

在该方法内部调试时：它导航到UnsatifiedLinkError类方法：

public UnsatisfiedLinkError(String detailMessage) {
    super(detailMessage);
}

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java Android NDK应用程序抛出错误未满足链接错误

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