加载recyclerView时出现滑动错误“您必须传入非空视图”

时间:2016-09-12 13:41:10

标签: android android-recyclerview android-glide

您好我正在尝试使用一系列图像填充Grid RecyclerView。 为此,我从网上获取图片网址并将其加载到List<>中。问题是,显然适配器获取的ImageView引用为null。这是代码:

private class ShowHolder extends RecyclerView.ViewHolder {
        public ImageView mImageView;
        public ProgressBar progressBar;

        public ShowHolder(LayoutInflater inflater, ViewGroup container) {
            super(inflater.inflate(R.layout.list_item_row, container, false));
            mImageView = (ImageView) itemView.findViewById(R.id.imageView);
            progressBar = (ProgressBar) itemView.findViewById(R.id.progress);
        }
    }

    private class ShowAdapter extends RecyclerView.Adapter<ShowHolder> {
        private List<Show> mShows;

        public ShowAdapter(List<Show> shows) {
            mShows = shows;
        }

        @Override
        public ShowHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
            return new ShowHolder(layoutInflater, parent);
        }
        @Override
        public void onBindViewHolder(ShowHolder holder, int position) {
            Show currentShow = mShows.get(position);




            Glide.with(getActivity())
                    .load(currentShow.getImage()) //image url
                    .listener(new RequestListener<String, GlideDrawable>() {
                        @Override
                        public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
                            return false;
                        }

                        @Override
                        public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
                                            holder.progressBar.setVisibility(View.GONE);
                            return false;
                        }
                    })
                    .into(holder.mImageView); //error here

        }
        @Override
        public int getItemCount() {
            return mShows.size();
        }
    }

这是我将图片网址传递给适配器的方式:

@Override
    public void onLoadFinished(Loader<List<Show>> loader, List<Show> shows) {
        // Clear the adapter of previous earthquake data
        mShowAdapter = new ShowAdapter(null);
        mShowAdapter.notifyDataSetChanged();

        // If there is a valid list of Shows, then add them to the adapter's
        // data set. This will trigger the ListView to update.
        Log.v(LOG_TAG, "onLoadFinished@shows: " + shows);
        if (shows != null && !shows.isEmpty()) {
            mShowAdapter = new ShowAdapter(shows);
            mShowAdapter.notifyDataSetChanged();
            mRecyclerView.setAdapter(mShowAdapter);
        }

        pb.setVisibility(View.GONE);
    }

堆栈跟踪:

FATAL EXCEPTION: main
                                                               Process: com.dcs.shows, PID: 27818
                                                               java.lang.IllegalArgumentException: You must pass in a non null View
                                                                   at com.bumptech.glide.GenericRequestBuilder.into(GenericRequestBuilder.java:678)
                                                                   at com.bumptech.glide.DrawableRequestBuilder.into(DrawableRequestBuilder.java:448)
                                                                   at com.dcs.shows.ListFragment$ShowAdapter.onBindViewHolder(ListFragment.java:154)
                                                                   at com.dcs.shows.ListFragment$ShowAdapter.onBindViewHolder(ListFragment.java:118)
                                                                   at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5768)
                                                                   at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5801)
                                                                   at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5037)
                                                                   at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4913)
                                                                   at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029)
                                                                   at android.support.v7.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:531)
                                                                   at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
                                                                   at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:578)
                                                                   at android.support.v7.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:170)
                                                                   at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3260)
                                                                   at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3069)
                                                                   at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3518)
                                                                   at android.view.View.layout(View.java:16630)
                                                                   at android.view.ViewGroup.layout(ViewGroup.java:5437)
                                                                   at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
                                                                   at android.view.View.layout(View.java:16630)
                                                                   at android.view.ViewGroup.layout(ViewGroup.java:5437)
                                                                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
                                                                   at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
                                                                   at android.view.View.layout(View.java:16630)
                                                                   at android.view.ViewGroup.layout(ViewGroup.java:5437)
                                                                   at android.support.design.widget.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:131)
                                                                   at android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42)
                                                                   at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1319)
                                                                   at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:817)
                                                                   at android.view.View.layout(View.java:16630)
                                                                   at android.view.ViewGroup.layout(ViewGroup.java:5437)
                                                                   at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1191)
                                                                   at android.view.View.layout(View.java:16630)
                                                                   at android.view.ViewGroup.layout(ViewGroup.java:5437)
                                                                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
                                                                   at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
                                                                   at android.view.View.layout(View.java:16630)
                                                                   at android.view.ViewGroup.layout(ViewGroup.java:5437)
                                                                   at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
                                                                   at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
                                                                   at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
                                                                   at android.view.View.layout(View.java:16630)
                                                                   at android.view.ViewGroup.layout(ViewGroup.java:5437)
                                                                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
                                                                   at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
                                                                   at android.view.View.layout(View.java:16630)
                                                                   at android.view.ViewGroup.layout(ViewGroup.java:5437)
                                                                   at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
                                                                   at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
                                                                   at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
                                                                   at android.view.View.layout(View.java:16630)
                                                                   at android.view.ViewGroup.layout(ViewGroup.java:5437)
                                                                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
                                                                   at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
                                                                   at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678)
                                                                   at android.view.View.layout(View.java:16630)

由于

1 个答案:

答案 0 :(得分:1)

onCerateViewHolder方法更改为:

    @Override
    public ShowHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            LayoutInflater inflater = LayoutInflater.from(getActivity());
            View rootView = inflater.inflate(R.layout.list_item_row, parent, false);
            return new ShowHolder(rootView);
    }

将持有人构造函数更改为:

   public ShowHolder(View itemView) {
            super(itemView);
            mImageView = (ImageView) itemView.findViewById(R.id.imageView);
            progressBar = (ProgressBar) itemView.findViewById(R.id.progress);
   }