未定义参考AAssetManager_fromJava [英] Undefined reference to AAssetManager_fromJava

问题描述

我试图使用AAssetManager一个Android APK访问的资产。不过，我不断收到
未定义的参考AAssetManager_fromJava即使我已经包括asset_manager.h和asset_manager_jni.h
从asset_manager.h其他功能，如AAssetManager_openDir（MGR，）等也不能被引用。

I am trying to access assets from an android apk using AAssetManager. However, I keep getting "Undefined reference to AAssetManager_fromJava" even though I've included asset_manager.h and asset_manager_jni.h Other functions from asset_manager.h, like AAssetManager_openDir(mgr, "") etc also can't be referenced.

下面是完整的code

Here's the complete code

#define EXPORT_API

#include <string.h>
#include <jni.h>
#include <android\log.h>

#include <sys\types.h>
#include <android\asset_manager.h>
#include <android\asset_manager_jni.h>

#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, "com.devin - native", __VA_ARGS__)

JNIEnv* env=0;

#ifdef __cplusplus
extern "C" {
#endif

JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* pvt){
    LOGD("JNI_OnLoad() called");
    vm->AttachCurrentThread(&env, 0);
    return JNI_VERSION_1_2;
}

EXPORT_API void LoadAsset(char* filename, jobject assetManager){
    AAssetManager* mgr = AAssetManager_fromJava(env, assetManager);
        /* More stuff */
}

#ifdef __cplusplus
};
#endif

这code为.cpp文件，并正与NDK R8编译。我做得可怕的错误在这里？

This code is in a .cpp file and being compiled with NDK R8. Am I doing something terribly wrong here?

推荐答案

我的错。我没有Android的库添加到链接器。我对Visual Studio的前preSS实际安装NDK开发环境和Android的库未添加到默认情况下，我的项目。

My mistake. I didn't have "android" library added to the linker. I have actually setup NDK dev environment on Visual Studio Express and "android" library wasn't added to my project by default.

如果您正在使用的makefile，务必使用原生AssetManager时-landroid添加到您的LOCAL_LDLIBS。

If you are using makefiles, be sure to add -landroid to your LOCAL_LDLIBS when using native AssetManager.

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