使用SwipeRefreshLayout和RecyclerView实现下拉刷新上拉加载更多

效果图: 

文件目录 

布局文件.xml：

• activity_main.xml

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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.day06_lianxi.MainActivity">

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

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

    android.support.v4.widget.SwipeRefreshLayout>

LinearLayout>

Java代码文件：

• RefreshRecyclerAdapter.java

package com.example.day06_lianxi;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.Gravity;
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 java.util.ArrayList;
import java.util.List;

/**
 * Created by 刘重阳 on 2018/1/2.
 */

public class RefreshRecyclerAdapter extends RecyclerView.Adapter {
    private static final int TYPE_ITEM = 0;
    private static final int TYPE_FOOTER = 1;

    public boolean isLoadMore = false;

    private Context mContext;
    private LayoutInflater mInflater;
    private List mTitles = null;

    public RefreshRecyclerAdapter(Context context) {
        this.mContext = context;
        this.mInflater = LayoutInflater.from(context);
        this.mTitles = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            int index = i + 1;
            mTitles.add("item" + index);
        }
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(-1, -2);
        if (viewType == TYPE_ITEM) {
            final TextView view = new TextView(mContext);
            view.setGravity(Gravity.CENTER);
            view.setLayoutParams(lp);
            ViewHolder viewHolder = new ViewHolder(view);
            return viewHolder;
        }
        final ProgressBar bar = new ProgressBar(mContext);
        bar.setLayoutParams(lp);
        ProgressViewHoler barViewHolder = new ProgressViewHoler(bar);
        return barViewHolder;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof ViewHolder) {
            ((ViewHolder) holder).item_tv.setText(mTitles.get(position));
            ((ViewHolder) holder).item_tv.setTag(position);
        }
//        ((ProgressViewHoler)(holder)).bar.setScrollBarStyle(ProgressBar.);
    }

    @Override
    public int getItemCount() {
        if (isLoadMore) {
            return mTitles.size() + 1;
        }
        return mTitles.size();
    }

    @Override
    public int getItemViewType(int position) {
        if (position + 1 == getItemCount() && isLoadMore) {
            return TYPE_FOOTER;
        }
        return TYPE_ITEM;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView item_tv;

        public ViewHolder(View itemView) {
            super(itemView);
            item_tv = (TextView) itemView;
        }
    }

    public static class ProgressViewHoler extends RecyclerView.ViewHolder {
        public ProgressBar bar;

        public ProgressViewHoler(View itemView) {
            super(itemView);
            bar = (ProgressBar) itemView;
        }
    }

    public void addItem(List newDatas) {
        newDatas.addAll(mTitles);
        mTitles.removeAll(mTitles);
        mTitles.addAll(newDatas);
        notifyDataSetChanged();
    }

    public void addMoreItem(List newData) {
        mTitles.addAll(newData);
        isLoadMore = false;
        notifyDataSetChanged();
    }

    public void startLoad() {
        isLoadMore = true;
        notifyDataSetChanged();
    }
}

• MainActivity.java

package com.example.day06_lianxi;

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.OrientationHelper;
import android.support.v7.widget.RecyclerView;
import android.util.TypedValue;
import android.widget.Toast;

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

import butterknife.Bind;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {

    @Bind(R.id.demo_swiperefreshlayout)
    SwipeRefreshLayout swipeRefreshLayout;

    @Bind(R.id.demo_recycler)
    RecyclerView recyclerView;

    private RefreshRecyclerAdapter adapter;
    private LinearLayoutManager linearLayoutManager;
    private int lastVisibleItem;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        swipeRefreshLayout.setProgressBackgroundColorSchemeResource(android.R.color.white);
        swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_light,
                android.R.color.holo_red_light, android.R.color.holo_orange_light,
                android.R.color.holo_green_light);
        swipeRefreshLayout.setProgressViewOffset(false, 0,
                (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, getResources().getDisplayMetrics()));
        linearLayoutManager = new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(OrientationHelper.VERTICAL);
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setAdapter(adapter = new RefreshRecyclerAdapter(this));

        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        List newDatas = new ArrayList();
                        for (int i = 0; i < 5; i++) {
                            int index = i + 1;
                            newDatas.add("new item" + index);
                        }
                        adapter.addItem(newDatas);
                        swipeRefreshLayout.setRefreshing(false);
                        Toast.makeText(MainActivity.this, "更新了5条数据", Toast.LENGTH_SHORT).show();
                    }
                }, 5000);
            }
        });

        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if(swipeRefreshLayout.isRefreshing()) return;
                if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem == adapter.getItemCount() - 1) {
                    adapter.startLoad();
                    new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            List newDatas = new ArrayList();
                            for (int i = 0; i < 5; i++) {
                                int index = i + 1;
                                newDatas.add("more item" + index);
                            }
                            adapter.addMoreItem(newDatas);
                        }
                    }, 1000);
                }
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
            }
        });
    }
}

注意！不要忘记需要添加的gradle依赖：

compile 'com.jakewharton:butterknife:7.0.1'

compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'