AndroidJavaException：java.lang.ClassNotFoundException：找不到类“ com.unity3d.player.ReflectionHelper”

Question

I am trying to call some java method in OnAudioFilterRead function body.

Here is the code segment.

void OnAudioFilterRead(float[] data, int channels)
{
    AndroidJNI.AttachCurrentThread();
    if (ok)
    {
        if (obj == null)
        {
            obj = new AndroidJavaObject("com.xx.aop.media.av.GPUFrameCapturer");
            Debug.Log(obj.Call<bool>("isRecording"));
        }
    }
}

When I build apk on Android platform.

Always encountered this error.

06-13 15:20:51.981 20255-20388/com.MeiTu.XRay E/Unity:

AndroidJavaException: java.lang.ClassNotFoundException: Didn't find class "com.unity3d.player.ReflectionHelper" on path: DexPathList[[directory "."], nativeLibraryDirectories=[/system/lib, /vendor/lib, /system/lib, /vendor/lib]]

java.lang.ClassNotFoundException: Didn't find class "com.unity3d.player.ReflectionHelper" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/system/lib, /vendor/lib, /system/lib, /vendor/lib]]

Answer 1

The OnAudioFilterRead function is called in another Thread so it looks like you used AndroidJNI.AttachCurrentThread() to make it possible to use AndroidJavaObject from another Thread. You also need to detach it. Call AndroidJNI.DetachCurrentThread() at the end of the OnAudioFilterRead function:

void OnAudioFilterRead(float[] data, int channels)
{
    AndroidJNI.AttachCurrentThread();
    if (ok)
    {
        if (obj == null)
        {
            obj = new AndroidJavaObject("com.xx.aop.media.av.GPUFrameCapturer");
            Debug.Log(obj.Call<bool>("isRecording"));
        }
    }
    AndroidJNI.DetachCurrentThread()
}

---

If this doesn't work, initialize the AndroidJavaObject outside the OnAudioFilterRead function such as the Start or Awake function then use it in the OnAudioFilterRead function like above.

AndroidJavaObject obj;

void Start()
{
    obj = new AndroidJavaObject("com.xx.aop.media.av.GPUFrameCapturer");
}

void OnAudioFilterRead(float[] data, int channels)
{
    AndroidJNI.AttachCurrentThread();
    if (ok)
    {
        if (obj == null)
        {
            Debug.Log(obj.Call<bool>("isRecording"));
        }
    }
    AndroidJNI.DetachCurrentThread()
}