应用程序中的 JNI 检测到错误：CallObjectMethodV 的返回类型与 void android.media.AudioTrack.play() 不匹配答案

【问题标题】：JNI DETECTED ERROR IN APPLICATION: the return type of CallObjectMethodV does not match void android.media.AudioTrack.play()应用程序中的 JNI 检测到错误：CallObjectMethodV 的返回类型与 void android.media.AudioTrack.play() 不匹配
【发布时间】：2017-11-20 13:33:09
【问题描述】：

我正在尝试使用 AudioTrack 播放来自 JNI 的音频缓冲区

使用以下代码从 JNI 初始化 AudioTrack 对象

    jclass AudioTrack = mEnv->FindClass("android/media/AudioTrack");
    jclass AudioFormat = mEnv->FindClass("android/media/AudioFormat");
    jclass AudioManager = mEnv->FindClass("android/media/AudioManager");

    jfieldID AudioFormat_ENCODING_PCM_16BIT = mEnv->GetStaticFieldID(AudioFormat, "ENCODING_PCM_16BIT", "I");
    jint ENCODING_PCM_16BIT =mEnv->GetStaticIntField( AudioFormat, AudioFormat_ENCODING_PCM_16BIT);

    jfieldID AudioFormat_CHANNEL_CONFIGURATION_MONO = mEnv->GetStaticFieldID(AudioFormat, "CHANNEL_CONFIGURATION_MONO", "I");
    jint CHANNEL_CONFIGURATION_MONO =mEnv->GetStaticIntField( AudioFormat, AudioFormat_CHANNEL_CONFIGURATION_MONO);

    getMinBufferSize = mEnv->GetStaticMethodID(AudioTrack,"getMinBufferSize","(III)I");

    // int minBufferSize = AudioTrack.getMinBufferSize(8000,AudioFormat.CHANNEL_CONFIGURATION_MONO,AdioFormat.ENCODING_PCM_16BIT);
    minBufferSize = mEnv->CallStaticIntMethod(AudioTrack,getMinBufferSize,8000,ENCODING_PCM_16BIT,CHANNEL_CONFIGURATION_MONO);

    //AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, 8000, AudioFormat.CHANNEL_CONFIGURATION_MONO,AudioFormat.ENCODING_PCM_16BIT, minBufferSize,AudioTrack.MODE_STREAM);
    jfieldID AudioManager_STREAM_MUSIC = mEnv->GetStaticFieldID(AudioManager, "STREAM_MUSIC", "I");
    jint STREAM_MUSIC = mEnv->GetStaticIntField( AudioManager, AudioManager_STREAM_MUSIC);

    jfieldID AudioTrack_MODE_STREAM = mEnv->GetStaticFieldID(AudioTrack, "MODE_STREAM", "I");
    jint MODE_STREAM = mEnv->GetStaticIntField( AudioTrack, AudioTrack_MODE_STREAM);

    audioTrackConstructor = mEnv->GetMethodID(AudioTrack,"<init>","(IIIIII)V");
    mAudioTrack = mEnv->NewObject(AudioTrack,audioTrackConstructor,STREAM_MUSIC,8000,CHANNEL_CONFIGURATION_MONO,ENCODING_PCM_16BIT,minBufferSize,MODE_STREAM);


    AudioTrack_Play =  mEnv->GetMethodID(AudioTrack,"play","()V");
    AudioTrack_Stop =  mEnv->GetMethodID(AudioTrack,"stop","()V");
    AudioTrack_Write=  mEnv->GetMethodID(AudioTrack,"write","([BII)I");

应用程序出错

JNI DETECTED ERROR IN APPLICATION：返回类型 CallObjectMethodV 不匹配 void android.media.AudioTrack.play()

当我执行代码时

 mEnv->CallObjectMethod(mAudioTrack,AudioTrack_Play);

感谢您的帮助

【问题讨论】：

你使用的是CallObjectMethod，而你应该使用CallVoidMethod。
你为什么要这样做？为什么不直接从java层调用AudioTrack.play()呢？
@Michael 谢谢它的工作:)，谢谢你的帮助（Y）
只需使用pipe()函数并将pipefd[0]传递给java层进行读取
它只工作文件，这是一个output，当被调用两次时 - 离开活动时也没有崩溃

标签： java android android-ndk java-native-interface jnienv

【解决方案1】：

替换这个：

env->CallObjectMethod( mediaPlayer.GetRawObject(), setSurfaceMethodId, parms);

有了这个：

env->CallVoidMethod( mediaPlayer.GetRawObject(), setSurfaceMethodId, parms );

【讨论】：