c语言简易安卓系统播放默认铃声的代码？

以下是使用C语言在安卓系统播放默认铃声的代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <jni.h>
#include <android/log.h>
#include <android/asset_manager.h>
#include <android/asset_manager_jni.h>
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>

// 获取 JavaVM 对象
JavaVM* g_vm;
JNIEnv* getJNIEnv()
{
    JNIEnv* env;
    (*g_vm)->AttachCurrentThread(g_vm, &env, NULL);
    return env;
}

// 创建播放器
SLObjectItf createSLPlayer(SLObjectItf engineObject, SLDataSource *dataSource, SLDataSink *dataSink)
{
    SLObjectItf playerObject;
    SLPlayItf playerInterface;
    SLBufferQueueItf bufferQueueInterface;

    const SLInterfaceID ids[] = { SL_IID_BUFFERQUEUE };
    const SLboolean req[] = { SL_BOOLEAN_TRUE };
    (*engineObject)->CreateAudioPlayer(engineObject, &playerObject, dataSource, dataSink, 1, ids, req);
    (*playerObject)->Realize(playerObject, SL_BOOLEAN_FALSE);
    (*playerObject)->GetInterface(playerObject, SL_IID_PLAY, &playerInterface);
    (*playerObject)->GetInterface(playerObject, SL_IID_BUFFERQUEUE, &bufferQueueInterface);

    return playerObject;
}

// 播放音频
void playAudio(SLObjectItf playerObject, SLuint32 sampleRate, SLuint32 channels, void *buffer, size_t bufferSize)
{
    SLPlayItf playerInterface;
    SLBufferQueueItf bufferQueueInterface;
    (*playerObject)->GetInterface(playerObject, SL_IID_PLAY, &playerInterface);
    (*playerObject)->GetInterface(playerObject, SL_IID_BUFFERQUEUE, &bufferQueueInterface);

    (*bufferQueueInterface)->Enqueue(bufferQueueInterface, buffer, bufferSize);
    (*playerInterface)->SetPlayState(playerInterface, SL_PLAYSTATE_PLAYING);
}

extern "C" JNIEXPORT void JNICALL Java_com_example_android_MainActivity_playDefaultRingtone(JNIEnv *env, jobject obj)
{
    // 初始化 OpenSL ES 引擎
    SLresult result;
    SLObjectItf engineObject;
    result = slCreateEngine(&engineObject, 0, NULL, 0, NULL, NULL);
    result = (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
    result = (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineInterface);

    // 设置播放器参数（默认铃声）
    SLuint32 sampleRate = SL_SAMPLINGRATE_44_1;
    SLuint32 channels = SL_CHANNEL_MASK_STEREO;
    SLuint32 bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;
    SLuint32 bytesPerSample = bitsPerSample >> 3;
    SLuint32 numBytes = 0;
    unsigned char *buffer = NULL;

    AAsset *asset = AAssetManager_open(assetManager, "media/audio/ringtones/ringtone1.ogg", AASSET_MODE_BUFFER);
    off_t length = AAsset_getLength(asset);
    buffer = new unsigned char[length];
    AAsset_read(asset, buffer, length);
    AAsset_close(asset);

    numBytes = length;

    // 设置数据来源和接收对象
    SLDataLocator_AndroidSimpleBufferQueue dataLocatorIn = { SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2 };
    SLDataFormat_PCM dataFormat = { SL_DATAFORMAT_PCM, channels, sampleRate, bitsPerSample, bytesPerSample, SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT, SL_BYTEORDER_LITTLEENDIAN };
    SLDataSource dataSource = { &dataLocatorIn, &dataFormat };
    SLDataLocator_OutputMix dataLocatorOut = { SL_DATALOCATOR_OUTPUTMIX, outputMixObject };
    SLDataSink dataSink = { &dataLocatorOut, NULL };
    SLObjectItf playerObject = createSLPlayer(engineObject, &dataSource, &dataSink);

    // 播放音频
    playAudio(playerObject, sampleRate, channels, buffer, numBytes);

    // 释放资源
    delete[] buffer;
    (*playerObject)->Destroy(playerObject);
    (*engineObject)->Destroy(engineObject);
}

请注意，此代码中的功能需要在JNI环境中使用，并且需要将其与Java代码结合使用。如果您希望更深入地了解此代码，请查看OpenSL ES开发文档或咨询专业开发人员。