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

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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

        <!-- 默认的进度条风格. 这是一个中等的圆形进度条 --><attr name="progressBarStyle" format="reference" /><!-- 水平进度条风格. 这是一个水平的进度条. --><attr name="progressBarStyleHorizontal" format="reference" /><!-- 小型进度条风格. 这是一个小型的圆形进度条 --><attr name="progressBarStyleSmall" format="reference" /><!-- 标题样式的小ProgressBar。 这是一个小的圆形进度条，将放置在标题栏中。 --><attr name="progressBarStyleSmallTitle" format="reference" /><!-- 大ProgressBar样式。 这是一个很大的圆形进度条 --><attr name="progressBarStyleLarge" format="reference" /><!-- 反ProgressBar样式。 这是一个中等的圆形进度栏。 --><attr name="progressBarStyleInverse" format="reference" /><!--小型反向ProgressBar样式。 这是一个小的圆形进度栏。 --><attr name="progressBarStyleSmallInverse" format="reference" /><!-- 大的反向ProgressBar样式。 这是一个很大的圆形进度栏。 --><attr name="progressBarStyleLargeInverse" format="reference" />

• 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

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"><androidx.swiperefreshlayout.widget.SwipeRefreshLayoutandroid:id="@+id/swipe_refresh_layout"android:layout_width="match_parent"android:layout_height="match_parent"><androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/recyclerview"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#fff"android:overScrollMode="never"/></androidx.swiperefreshlayout.widget.SwipeRefreshLayout></androidx.constraintlayout.widget.ConstraintLayout>

• 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() {@Overridepublic 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);@Overridepublic 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;}}@Overridepublic 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() {@Overrideprotected void onLoading(int countItem, int lastItem) {Handler handler = new Handler();handler.postDelayed(new Runnable() {@Overridepublic 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<RecyclerView.ViewHolder> {private Context mContext;private static final int TYPE_CONTENT = 0;private static final int TYPE_FOOTER = 1;private List<MakeListDataBO> mDataBOList;public ArticleAdapter(Context mContext, List<MakeListDataBO> dataBOList) {this.mContext = mContext;this.mDataBOList = dataBOList;}@NonNull@Overridepublic 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);}}@Overridepublic 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<String> mList = mDataBOList.get(position).getList();viewHolder.mImageView.setImagesData(mList);}}@Overridepublic int getItemCount() {return mDataBOList.size() + 1;}@Overridepublic 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

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