https://developers.weixin.qq.com/doc/oplatform/Mobile_App/Share_and_Favorites/Android.html

照你你们的微信开放文档找不到

Util.bmpToByteArray(thumbBitmap, true);

这个Util类

Bitmap thumb = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.send_music_thumb);

找不到

R.drawable.send_music_thumb