code: public void cancel() {
          wannaCancel = true;
          stop();
          if (!TextUtils.isEmpty(fullPath)) {
              File file = new File(fullPath);
              file.deleteOnExit();
          }
          if (null != mOnRecordPreparedListener) {
              mOnRecordPreparedListener.onCancel();
          }
      }
docs: 取消录制并删除已录制的文件