可以作为保存全局数据使用，比如在mianActivity中使用，

public class CacheManager {

  private static volatile CacheManager instance;

  private OnMainActivityListener mainActivityListener;

  public List<BaseInfoBean> inInterDataList = new ArrayList<>();

  public List<BaseInfoBean> baseInfoBeansLists = new ArrayList<>();

  private int chatScreenHeight;//chatActivity的可视布局高度，用于软键盘的全屏与缩放功能计算

  public boolean smsStatus;

  public static CacheManager getInstance(){
      if(instance == null){
          synchronized (CacheManager.class) {
              if(instance == null){
                  instance = new CacheManager();
              }
          }
      }
      return instance;
  }

  public OnMainActivityListener getMainActivityListener() {
      return mainActivityListener;
  }

  public void setMainActivityListener(OnMainActivityListener mainActivityListener) {
      this.mainActivityListener = mainActivityListener;
  }

  public void clear(){
      this.mainActivityListener = null;
      instance = null;
  }

  public int getChatScreenHeight() {
      return chatScreenHeight;
  }

  public  void setChatScreenHeight(int chatScreenHeight) {
      this.chatScreenHeight = chatScreenHeight;
  }

  public void setBaseBeaanListTest(List<BaseInfoBean> baseInfoBeansList) {
      this.baseInfoBeansLists = baseInfoBeansList;
      for (int i= 0;i< baseInfoBeansList.size();i++) {
          if (baseInfoBeansList.get(i).getServerFlag() != 0) {
              this.inInterDataList.add(baseInfoBeansLists.get(i));
          }
      }
  }

  public void setSmsStatus(boolean smsStatus) {
      this.smsStatus = smsStatus;
  }

  private int rtcSecLevelSend=0;//发起请求，由输入框，聊天对象等级更新；

  public int getRtcSecLevelReceive() {
      int rtcSecLevelReceive=0;
      try{
          rtcSecLevelReceive = Integer.parseInt(VIMVideoClient.videoState.getMultiExtend().get("securityLevel"));
      }catch (Exception e){
          VideoLog.d("VideoRequestHandler"," getRtcSecLevelReceive e "+ e.toString());
      }
      VideoLog.d("VideoRequestHandler"," getRtcSecLevelReceive "+ rtcSecLevelReceive);
      return rtcSecLevelReceive;
  }

  public void setRtcSecLevelReceive(int rtcSecLevelReceive) {
      VideoLog.d("VideoRequestHandler"," setRtcSecLevelReceive "+ rtcSecLevelReceive);
      VIMVideoClient.videoState.getMultiExtend().put("securityLevel",rtcSecLevelReceive+"");
  }

  public int getRtcSecLevelSend() {
      return rtcSecLevelSend;
  }

  public void setRtcSecLevelSend(int rtcSecLevelSend) {
      this.rtcSecLevelSend = rtcSecLevelSend;
  }
}