ITicktetPresentImpl中  this.mCallback = callback; 时是有值的, 可是到了 onResponse中mCallback为空

//homepageFragment执行跳转操作

public void getClickItem(homePageContent.DataBean data) {
    mTicktetPresentImpl = new PresentManager().getmITicketPresent();
    mTicktetPresentImpl.LoadTicket(data.getTitle(),data.getClick_url(),data.getPict_url());

    startActivity(new Intent(getContext(), TicketActivity.class));

}

----------------------ITicktetPresentImpl中加载网络请求----------------

public class ITicktetPresentImpl implements ITicketPresent {

    public ITicketPageCallBack mCallback=null;
    private String mImageUrl;
    private TicketResult mTicketResult;
    //判断当前的加载状态
    enum LoadState{
        SUCCESS,ERROR,LOADDING,NONE
    }
    private LoadState currentState =LoadState.NONE;

    @Override
    public void LoadTicket(String title, String url, String imageUrl) {
        loadingAction();
        LogUtils.w(this,"title"+title);
        LogUtils.w(this,"url"+url);
        LogUtils.w(this,"imageUrl"+imageUrl);
      String newUrl = URLUtils.setStartHttps(url);
        LogUtils.w(this,"newUrl"+newUrl);
        mImageUrl = imageUrl;
        //post请求数据
        Retrofit retrofit = RetrofitManager.getInstance().getRetrofit();
        //创建api实例
        Api api = retrofit.create(Api.class);
//        Call<categories> task = api.getCategories();
        TicketParaments TicketParaments  = new TicketParaments(title,newUrl);
      Call<TicketResult>task = api.getTicketResult(TicketParaments);
      task.enqueue(new Callback<TicketResult>() {
          @Override
          public void onResponse(Call<TicketResult> call, Response<TicketResult> response) {
             int reponseCode = response.code();
             if (reponseCode == HttpURLConnection.HTTP_OK)
             {
                 LogUtils.w(ITicktetPresentImpl.this,"mCallback"+mCallback);
                 //请求成功
                 mTicketResult = response.body();
                 LogUtils.w(ITicktetPresentImpl.this,"请求成功"+mTicketResult.toString());

                 loadSuccessAction();

             }else
             {

                 loadErrorAction();
             }
          }


          @Override
          public void onFailure(Call<TicketResult> call, Throwable t) {
              LogUtils.w(ITicktetPresentImpl.this,"请求失败"+t.toString());
              loadErrorAction();
          }
      });
    }

    //加载成功封装
    private void loadSuccessAction() {
        LogUtils.w(this,"Ui成功回调");
        if (mCallback != null) {
            mCallback.onSuccessLoad(mImageUrl, mTicketResult);
        }else
        {
            currentState = LoadState.SUCCESS;
        }
        //否则就修改为success状态
    }
    //加载失败封装
    private void loadErrorAction() {
        if (mCallback != null) {
            mCallback.loadError();
        }else
        {
            currentState = LoadState.ERROR;
        }
    }

    //加载loadding
    private void loadingAction() {
        if (mCallback != null) {
            //加载成功,通知UI
            mCallback.loadding();
        }else
        {
            currentState = LoadState.LOADDING;
        }
    }

    @Override
    public void registerViewCallback(ITicketPageCallBack callback) {
        this.mCallback = callback;
        if (currentState !=LoadState.NONE)
        {
            LogUtils.w(this,"准备执行");

//            根据不同状态来设置ui
            if (currentState == LoadState.SUCCESS)
            {

                loadSuccessAction();
            }else if(currentState ==LoadState.ERROR)
            {
                loadErrorAction();
            }else if(currentState == LoadState.LOADDING) {
                loadingAction();
            }

        }
    }


    @Override
    public void unRegisterViewCallback(ITicketPageCallBack callBack) {

      this.mCallback = null;
    }
}

@Override
protected void initListener() {
    mITicketPresent = PresentManager.newInstance().getmITicketPresent();

    if (mITicketPresent !=null) {
        mITicketPresent.registerViewCallback(this);
    }
}