c - SL_IID_ANDROIDSIMPLEBUFFERQUEUE调用的问题

Question

我想用jni在c层直接调用音频设置录音，在网上找了例子边研究，边编写代码时，发现
SL_IID_ANDROIDSIMPLEBUFFERQUEUE这个预定义变量只有声明，没有值，导致我编译不通过

提示 Error:(178) undefined reference to 'SL_IID_ANDROIDSIMPLEBUFFERQUEUE'

而我检查过代码了，已经include相关的头文件了

include <SLES/OpenSLES.h>

include <SLES/OpenSLES_Android.h>

我是c菜鸟，望大神指点迷津！
代码如下

int initNativeRecorder(){
    SLresult f_result;
    SLDataLocator_IODevice loc_dev={SL_DATALOCATOR_IODEVICE,SL_IODEVICE_AUDIOINPUT,SL_DEFAULTDEVICEID_AUDIOINPUT,NULL};
    SLDataSource aud_src = {&loc_dev,NULL};
    LOGE("Setup Audio Input Dev! OK！");
    SLDataLocator_AndroidSimpleBufferQueue mQueue = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE,2};
    SLDataFormat_PCM mFormat = {SL_DATAFORMAT_PCM,1,SL_SAMPLINGRATE_16,SL_PCMSAMPLEFORMAT_FIXED_16,SL_PCMSAMPLEFORMAT_FIXED_16,SL_SPEAKER_FRONT_CENTER,SL_BYTEORDER_LITTLEENDIAN};
    SLDataSink mAudSink = {&mQueue,&mFormat};
    LOGE("Configure Audio Recorder! OK！");
    const SLInterfaceID mId[1] = {SL_IID_ANDROIDSIMPLEBUFFERQUEUE};
    const SLboolean mReq[1] = {SL_BOOLEAN_TRUE};
    LOGE("Open Audio Device To Recorder! OK！");
    f_result = (*m_Engine)->CreateAudioRecorder(m_Engine,&m_RecordObject,&aud_src,&mAudSink,1,mId,mReq);
    return 0;
}

Answer 1

应该是linking时找不到OpenSLES库，检查你的.mk档看看