Rikka仿网易云项目点击每日推荐跳出bug

Question

Rikka仿网易云项目点击每日推荐跳出bug
java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object[] java.util.Collection.toArray()' on a null object reference

报错代码， 文件main/mvo/view/DailyRecommendActivity

 @Override
    public void onGetDailyRecommendSuccess(DailyRecommendBean bean) {
        hideDialog();
        LogUtil.d(TAG, "onGetDailyRecommendSuccess : " + bean);
        SharePreferenceUtil.getInstance(this).saveDailyUpdateTime(System.currentTimeMillis());
        dailyList.addAll(bean.getRecommend());   // 该行代码报错

涉及的文件WowPresenter

public void getDailyRecommend() {
        mModel.getDailyRecommend().subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<DailyRecommendBean>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        LogUtil.d(TAG, "getDailyRecommend Subscribe");
                    }

                    @Override
                    public void onNext(DailyRecommendBean bean) {
                        LogUtil.d(TAG, "onNext" + bean);
                        mView.onGetDailyRecommendSuccess(bean);
                    }

                    @Override
                    public void onError(Throwable e) {
                        LogUtil.e(TAG, "onError" + e);
                        mView.onGetDailyRecommendFail(e.getMessage());
                    }

    }

网络请求时成功的，但数据缺失，有尝试过多getRecommend()判空，bug不在了，但依旧页面没有数据显示
文件DailyRecommendBean

Answer 1

bean.getRecommend()这个数据为空了，所以报错了

 @Override
    public void onGetDailyRecommendSuccess(DailyRecommendBean bean) {
        hideDialog();
        LogUtil.d(TAG, "onGetDailyRecommendSuccess : " + bean);
        SharePreferenceUtil.getInstance(this).saveDailyUpdateTime(System.currentTimeMillis());
        dailyList.addAll(bean.getRecommend());   // 该行代码报错

为空的原因，应该是下面这个