code: public void save(OnSaveLogListener listener) {
          File dir = getLogDir();
  
          if (dir == null) {
              listener.onError("Can't save logs. External storage is not mounted. " +
                  "Check android.permission.WRITE_EXTERNAL_STORAGE permission");
              return;
          }
  
          FileWriter fileWriter = null;
  
          try {
              File output = new File(dir, getLogFileName());
              fileWriter = new FileWriter(output, true);
  
              List<LogEntry> entries = bufferedLogs();
              for (LogEntry entry : entries) {
                  fileWriter.write(entry.prettyPrint() + "\n");
              }
  
              listener.onSave(output);
  
          } catch (IOException e) {
              listener.onError(e.getMessage());
              e.printStackTrace();
  
          } finally {
              if (fileWriter != null) {
                  try {
                      fileWriter.close();
                  } catch (IOException e) {
                      listener.onError(e.getMessage());
                      e.printStackTrace();
                  }
              }
          }
      }
docs: Save the current logs to disk.