SwipeRefreshLayout + RecyclerView 实现上拉刷新和下拉刷新

Posted 2020-08-08 森林森

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下拉刷新和上拉刷新都用SwipeRefreshLayout 自带的进度条

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.liu.swiperefreshlayoutrecyclerviewdemo.MainActivity">


    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipeRefreshLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </android.support.v7.widget.RecyclerView>


    </android.support.v4.widget.SwipeRefreshLayout>


</LinearLayout>

item布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:app="http://schemas.android.com/apk/res-auto"
              android:orientation="vertical"
              android:layout_margin="5dp"
              android:layout_width="match_parent"
              android:layout_height="wrap_content">

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        app:cardCornerRadius="10dp"
        android:elevation="10dp">
        <TextView
            android:layout_margin="10dp"
            android:textSize="18sp"

            android:id="@+id/tvContent"
            android:text="魂牵梦萦地"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </android.support.v7.widget.CardView>

</LinearLayout>

Adapter

package com.liu.swiperefreshlayoutrecyclerviewdemo.adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import com.liu.swiperefreshlayoutrecyclerviewdemo.R;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by 刘楠 on 2016/9/10 0010.18:06
 */
public class RefreshAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    Context        mContext;
    LayoutInflater mInflater;
    List<String>   mDatas;


    public RefreshAdapter(Context context, List<String> datas) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
        mDatas = datas;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View itemView = mInflater.inflate(R.layout.item_refresh_recylerview, parent, false);

        return new ItemViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        if(holder instanceof ItemViewHolder){

            ItemViewHolder itemViewHolder = (ItemViewHolder) holder;
            String str = mDatas.get(position);
            itemViewHolder.mTvContent.setText(str);

        }

    }

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

    @Override
    public int getItemViewType(int position) {

        return super.getItemViewType(position);
    }

    public class ItemViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.tvContent)
        TextView mTvContent;
        public ItemViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this,itemView);
            initListener(itemView);
        }

        private void initListener(View itemView) {
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(mContext, "poistion "+ getAdapterPosition(), Toast.LENGTH_SHORT).show();
                }
            });
        }
    }




    public void AddHeaderItem(List<String> items){
        mDatas.addAll(0,items);
        notifyDataSetChanged();
    }

    public void AddFooterItem(List<String> items){
        mDatas.addAll(items);
        notifyDataSetChanged();
    }
}

Activity

package com.liu.swiperefreshlayoutrecyclerviewdemo;

import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Window;
import android.widget.Toast;

import com.liu.swiperefreshlayoutrecyclerviewdemo.adapter.RefreshAdapter;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {

    @BindView(R.id.recyclerView)
    RecyclerView       mRecyclerView;
    @BindView(R.id.swipeRefreshLayout)
    SwipeRefreshLayout mSwipeRefreshLayout;

    List<String> mDatas = new ArrayList<>();
    private RefreshAdapter mRefreshAdapter;
    private LinearLayoutManager mLinearLayoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        initView();
        initData();
        initListener();
    }

    private void initView() {

        mSwipeRefreshLayout.setColorSchemeColors(Color.RED,Color.BLUE,Color.GREEN);

    }

    private void initData() {

        for (int i = 0; i < 10; i++) {

            mDatas.add(" Item "+i);
        }

        initRecylerView();
    }

    private void initRecylerView() {

        mRefreshAdapter = new RefreshAdapter(this,mDatas);
        mLinearLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);

        mRecyclerView.setLayoutManager(mLinearLayoutManager);
        mRecyclerView.setAdapter(mRefreshAdapter);

    }

    private void initListener() {

        initPullRefresh();

        initLoadMoreListener();

    }



    private void initPullRefresh() {
        mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {


                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        List<String> headDatas = new ArrayList<String>();
                        for (int i = 20; i <30 ; i++) {

                            headDatas.add("Heard Item "+i);
                        }
                        mRefreshAdapter.AddHeaderItem(headDatas);

                        //刷新完成
                        mSwipeRefreshLayout.setRefreshing(false);
                        Toast.makeText(MainActivity.this, "更新了 "+headDatas.size()+" 条目数据", Toast.LENGTH_SHORT).show();
                    }

                }, 3000);

            }
        });
    }

    private void initLoadMoreListener() {

        mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
            int lastVisibleItem ;
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);

                //判断RecyclerView的状态 是空闲时，同时，是最后一个可见的ITEM时才加载
                if(newState==RecyclerView.SCROLL_STATE_IDLE&&lastVisibleItem+1==mRefreshAdapter.getItemCount()){

                    new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {

                            List<String> footerDatas = new ArrayList<String>();
                            for (int i = 0; i< 10; i++) {

                                footerDatas.add("footer  item" + i);
                            }
                            mRefreshAdapter.AddFooterItem(footerDatas);
                            Toast.makeText(MainActivity.this, "更新了 "+footerDatas.size()+" 条目数据", Toast.LENGTH_SHORT).show();
                        }
                    }, 3000);


                }

            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);

               LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
                //最后一个可见的ITEM
                lastVisibleItem=layoutManager.findLastVisibleItemPosition();
            }
        });

    }
}

实现下拉刷新用SwipeRefreshLayout 自带的进度条，上拉刷新用类似ListView的刷新提示“加载中”等信息。

load_more 布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/loadLayout"
              android:padding="10dp"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"

              android:gravity="center"
              android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="5dip"
        android:layout_marginTop="5dip"
        android:gravity="center">

        <ProgressBar
            android:id="@+id/pbLoad"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:layout_centerVertical="true"
            android:indeterminate="false"/>

        <TextView
            android:id="@+id/tvLoadText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="4dip"
            android:layout_toRightOf="@id/pbLoad"
            android:clickable="true"
            android:text="魂牵梦萦 魂牵梦萦 "
            android:textColor="#000000"
            android:textSize="16sp"/>
    </RelativeLayout>

</LinearLayout>

Adapter

package com.liu.swiperefreshlayoutrecyclerviewdemo.adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.liu.swiperefreshlayoutrecyclerviewdemo.R;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by 刘楠 on 2016/9/10 0010.18:06
 */
public class RefreshAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    Context        mContext;
    LayoutInflater mInflater;
    List<String>   mDatas;
    private static final int TYPE_ITEM   = 0;
    private static final int TYPE_FOOTER = 1;

    //上拉加载更多
    public static final int PULLUP_LOAD_MORE = 0;
    //正在加载中
    public static final int LOADING_MORE     = 1;
    //没有加载更多 隐藏
    public static final int NO_LOAD_MORE     = 2;

    //上拉加载更多状态-默认为0
    private int mLoadMoreStatus = 0;


    public RefreshAdapter(Context context, List<String> datas) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
        mDatas = datas;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        if (viewType == TYPE_ITEM) {
            View itemView = mInflater.inflate(R.layout.item_refresh_recylerview, parent, false);

            return new ItemViewHolder(itemView);
        } else if (viewType == TYPE_FOOTER) {
            View itemView = mInflater.inflate(R.layout.load_more_footview_layout, parent, false);

            return new FooterViewHolder(itemView);
        }
        return null;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        if (holder instanceof ItemViewHolder) {

            ItemViewHolder itemViewHolder = (ItemViewHolder) holder;
            String         str            = mDatas.get(position);
            itemViewHolder.mTvContent.setText(str);

        } else if (holder instanceof FooterViewHolder) {


            FooterViewHolder footerViewHolder = (FooterViewHolder) holder;


            switch (mLoadMoreStatus) {
                case PULLUP_LOAD_MORE:
                    footerViewHolder.mTvLoadText.setText("上拉加载更多...");
                    break;
                case LOADING_MORE:
                    footerViewHolder.mTvLoadText.setText("正加载更多...");
                    break;
                case NO_LOAD_MORE:
                    //隐藏加载更多
                    footerViewHolder.mLoadLayout.setVisibility(View.GONE);
                    break;

            }
        }

    }

    @Override
    public int getItemCount() {
        //RecyclerView的count设置为数据总条数+ 1（footerView）
        return mDatas.size() + 1;
    }

    @Override
    public int getItemViewType(int position) {

        if (position + 1 == getItemCount()) {
            //最后一个item设置为footerView
            return TYPE_FOOTER;
        } else {
            return TYPE_ITEM;
        }
    }

    public class ItemViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.tvContent)
        TextView mTvContent;

        public ItemViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
            initListener(itemView);
        }

        private void initListener(View itemView) {
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(mContext, "poistion " + getAdapterPosition(), Toast.LENGTH_SHORT).show();
                }
            });
        }
    }

    public class FooterViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.pbLoad)
        ProgressBar  mPbLoad;
        @BindView(R.id.tvLoadText)
        TextView     mTvLoadText;
        @BindView(R.id.loadLayout)
        LinearLayout mLoadLayout;
        public FooterViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this,itemView);
        }
    }


    public void AddHeaderItem(List<String> items) {
        mDatas.addAll(0, items);
        notifyDataSetChanged();
    }

    public void AddFooterItem(List<String> items) {
        mDatas.addAll(items);
        notifyDataSetChanged();
    }

    /**
     * 更新加载更多状态
     * @param status
     */
    public void changeMoreStatus(int status){
        mLoadMoreStatus=status;
        notifyDataSetChanged();
    }
}

Activity

变更加载更多方法

  private void initLoadMoreListener() {

        mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
            int lastVisibleItem ;
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);

                //判断RecyclerView的状态 是空闲时，同时，是最后一个可见的ITEM时才加载
                if(newState==RecyclerView.SCROLL_STATE_IDLE&&lastVisibleItem+1==mRefreshAdapter.getItemCount()){

                    //设置正在加载更多
                    mRefreshAdapter.changeMoreStatus(mRefreshAdapter.LOADING_MORE);

                    new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {

                            List<String> footerDatas = new ArrayList<String>();
                            for (int i = 0; i< 10; i++) {

                                footerDatas.add("footer  item" + i);
                            }
                            mRefreshAdapter.AddFooterItem(footerDatas);
                            //设置回到上拉加载更多
                            mRefreshAdapter.changeMoreStatus(mRefreshAdapter.PULLUP_LOAD_MORE);
                            Toast.makeText(MainActivity.this, "更新了 "+footerDatas.size()+" 条目数据", Toast.LENGTH_SHORT).show();
                        }
                    }, 3000);


                }

            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);

               LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
                //最后一个可见的ITEM
                lastVisibleItem=layoutManager.findLastVisibleItemPosition();
            }
        });

    }

源码：

https://github.com/ln0491/SwipeRefreshLayoutRecyclerViewDemo

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