JNI call block Coroutine & update thread

In Oculus VR Project play video by wifi, code below:

StartCoroutine (StartPlayCoroutine ());
  IEnumerator StartPlayCoroutine () {
  ...
  mediaPlayer = StartVideoPlayerOnTextureId(textureWidth, textureHeight, mediaFullPath);
}

AndroidJavaObject StartVideoPlayerOnTextureId () {
  IntPtr setSurfaceMethodId = AndroidJNI.GetMethodID(mediaPlayer.GetRawClass(),"setSurface",(Landroid/view/Surface;)
  try
  {
    Debug.Log("timestamp000"+Time.fixedTime);
    mediaPlayer.Call("setDataSource", mediaPath);
    mediaPlayer.Call("prepare");
    mediaPlayer.Call("setLooping", true);
    mediaPlayer.Call("start");
    Debug.Log("timestamp111"+Time.fixedTime);
  }
  catch (Exception e)
  {
    Debug.Log("Failed to start mediaPlayer with message " + e.Message);
  }
  return mediaPlayer;
}

From the log I find that timestamp000 19.00 and timestamp111 19.00 but t$$anonymous$$s takes more than 10s. and update thread also block.

It seems that but JNI takes too much times, and block the Coroutine and update thread.

The screen also blocked.

Does there have a method to solve it?