【项目FJU】使用SwipeRefreshLayout+RecyclerView制作下拉刷新上拉加载更多

效果截图

https://github.com/ydslib/Jianshu/tree/develop

需要用到的知识

• setColorSchemeResources：设置下拉刷新进度条的颜色
• setOnRefreshListener：设置下拉刷新监听
• android:overScrollMode：设置滑动到边缘时无效果模式
• ContentLoadingProgressBar：内容加载进度条，继承ProgressBar，该进度在显示时将以最短时间内显示，在消失时最短时间内消失，避免了UI闪烁。
• 设置上拉加载更多进度条颜色

mProgressBar.getIndeterminateDrawable().setColorFilter(ContextCompat.getColor(mContext,R.color.f_font_tabbar_text_selected), PorterDuff.Mode.MULTIPLY);

• progressBar的style

• android:elevation：设置控件阴影
• newState的三种状态

//空闲，RecyclerView空闲时返回的状态值，RecyclerView完全停止
public static final int SCROLL_STATE_IDLE = 0;
//拖拽，RecyclerView滑动时返回的状态值
public static final int SCROLL_STATE_DRAGGING = 1;
//停止，RecyclerView停止时返回的状态值，此时手指已经离开屏幕，但RecyclerView可能由于惯性依然在滑动
public static final int SCROLL_STATE_SETTLING = 2;

代码实现

• SwipeRefreshLayout+RecyclerView布局

• RecyclerView加载Adapter

        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        dataBOList = MakeListDataDAO.parseMakeListData(getContext());
        mAdapter = new ArticleAdapter(getActivity(),dataBOList);
        mRecyclerView.setAdapter(mAdapter);

• 下拉刷新

        mRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                dataBOList.clear();
                dataBOList.addAll(MakeListDataDAO.refreshMakeListData(getContext()));
                mAdapter.notifyDataSetChanged();

                mRefreshLayout.setRefreshing(false);
            }
        });
        mRefreshLayout.setColorSchemeResources(R.color.f_font_tabbar_text_selected);

• 上拉加载更多监听

/**
 * Created by yds
 * on 2020/3/24.
 */
public abstract class OnLoadMoreListener extends RecyclerView.OnScrollListener {
    private int countItem;
    private int lastItem;
    private boolean isScrolled = false;
    private static boolean isAllScreen = false;
    private RecyclerView.LayoutManager mLayoutManager;

    protected abstract void onLoading(int countItem, int lastItem);

    @Override
    public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
        if (newState == RecyclerView.SCROLL_STATE_DRAGGING || newState == RecyclerView.SCROLL_STATE_SETTLING) {
            isScrolled = true;
            isAllScreen = true;
        } else {
            isScrolled = false;
        }
    }

    @Override
    public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
        if (recyclerView.getLayoutManager() instanceof LinearLayoutManager) {
            mLayoutManager = recyclerView.getLayoutManager();
            countItem = mLayoutManager.getItemCount();
            lastItem = ((LinearLayoutManager) mLayoutManager).findLastCompletelyVisibleItemPosition();
        }
        if (isScrolled && countItem != lastItem && lastItem == countItem - 1) {
            onLoading(countItem, lastItem);
        }
    }
    public static boolean isAllScreen(){
        return isAllScreen;
    }

• 上拉加载更多

       mRecyclerView.addOnScrollListener(new OnLoadMoreListener() {
            @Override
            protected void onLoading(int countItem, int lastItem) {
                Handler handler = new Handler();
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        dataBOList.addAll(MakeListDataDAO.refreshMakeListData(getContext()));
                        mAdapter.notifyDataSetChanged();
                        if (mRefreshLayout.isRefreshing()){
                            mRefreshLayout.setRefreshing(false);
                        }
                    }
                },3000);

            }
        });

• Adapter

/**
 * Created by yds
 * on 2020/3/10.
 */
public class ArticleAdapter extends RecyclerView.Adapter {
    private Context mContext;
    private static final int TYPE_CONTENT = 0;
    private static final int TYPE_FOOTER = 1;
    private List mDataBOList;

    public ArticleAdapter(Context mContext, List dataBOList) {
        this.mContext = mContext;
        this.mDataBOList = dataBOList;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
//        View view = LayoutInflater.from(mContext).inflate(R.layout.recycler_adapter_item_article, parent, false);
//        return new ViewHolder(view);
        if (viewType == TYPE_CONTENT){
            View view = LayoutInflater.from(mContext).inflate(R.layout.recycler_adapter_item_article, parent, false);
            return new ViewHolder(view);
        }else{
            View view = LayoutInflater.from(mContext).inflate(R.layout.recycler_adapter_item_footer, parent, false);
            return new FootViewHolder(view);
        }

    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        if (getItemViewType(position)==TYPE_FOOTER){
            FootViewHolder viewHolder = (FootViewHolder) holder;
            viewHolder.mProgressBar.getIndeterminateDrawable().setColorFilter(ContextCompat.getColor(mContext,R.color.f_font_tabbar_text_selected), PorterDuff.Mode.MULTIPLY);
        }else{
            ViewHolder viewHolder = (ViewHolder) holder;
            Glide.with(mContext).load(mDataBOList.get(position).getHeadUrl()).thumbnail(0.3f).into(viewHolder.mCircleImageView);
            viewHolder.mUserName.setText(mDataBOList.get(position).getUserName());
            viewHolder.mTime.setText(mDataBOList.get(position).getTime());
            viewHolder.mAbstract.setText(mDataBOList.get(position).getAbstractStr());
            List mList = mDataBOList.get(position).getList();
            viewHolder.mImageView.setImagesData(mList);
        }


    }

    @Override
    public int getItemCount() {
        return mDataBOList.size() + 1;
    }

    @Override
    public int getItemViewType(int position) {
        if (position == mDataBOList.size()&& OnLoadMoreListener.isAllScreen()) {
            return TYPE_FOOTER;
        }
        return TYPE_CONTENT;
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        private MultiImageView mImageView;
        private CirCleImageView mCircleImageView;
        private TextView mUserName;
        private TextView mTime;
        private TextView mAbstract;

        //        private RecyclerView mRecyclerView;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            mImageView = itemView.findViewById(R.id.image_three);
            mCircleImageView = itemView.findViewById(R.id.circle_img);
            mUserName = itemView.findViewById(R.id.user_name);
            mTime = itemView.findViewById(R.id.time);
            mAbstract = itemView.findViewById(R.id.abstract_article_tv);
//            mRecyclerView = itemView.findViewById(R.id.image_recyclerview);
        }
    }

    public class FootViewHolder extends RecyclerView.ViewHolder {
        private ContentLoadingProgressBar mProgressBar;

        public FootViewHolder(@NonNull View itemView) {
            super(itemView);
            mProgressBar = itemView.findViewById(R.id.load_more_progress);
        }
    }
}

源码地址：https://github.com/ydslib/Jianshu/tree/develop