RecycleView上拉加载和下拉刷新二

之前写过一篇刷新加载http://blog.youkuaiyun.com/pengyu1801/article/details/51171961

这次是进行改装完善，

代码中注释的很详细，所以就直接上代码了。

核心实现

package com.example.fly.recyclerviewrefresh.base;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import com.example.fly.recyclerviewrefresh.R;
import java.util.ArrayList;
import java.util.List;

/**
 * 类名：
 * 类描述：下拉刷新和上拉加载
 * 创建人：fly
 * 创建日期： 2017/2/2.
 * 版本：V1.0
 */
public abstract class RefreshActivity<T extends Object,A extends RecyclerView.Adapter> extends BaseActivity implements SwipeRefreshLayout.OnRefreshListener {
    protected SwipeRefreshLayout swipeRefreshLayout;
    protected RecyclerView recyclerView;
    protected LinearLayoutManager linearLayoutManager;
    protected A adapter;
    protected List<T> lists = new ArrayList<>();
    protected T dataBeanLoadMore = createBean();
    protected boolean isLoadDataIng;  // 默认为false  是否正在加载数据， false 不在加载， true 正在加载
    protected boolean isScrollY;      // 是否在Y轴（垂直方向）上滑动， false 没滑动， true 滑动

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(setLayout());
        swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
        swipeRefreshLayout.setOnRefreshListener(this);
        swipeRefreshLayout.setColorSchemeResources(Refresh.colors);   // 设置变化的颜色
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);
        loadMore();
    }

    /**作用就是能在父类中初始化公共的控件如上面的onCreate(@Nullable Bundle savedInstanceState)初始化的控件*/
    protected abstract int setLayout();

    public abstract T createBean();

//    public abstract A createAdapter();

    /**上拉加载*/
    protected void loadMore() {
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {

            /**
             *
             * @param recyclerView 当前在滚动的RecyclerView
             * @param newState     当前滚动状态
             *                     newState有三种值:
            //静止,没有滚动
            public static final int SCROLL_STATE_IDLE = 0;

            //正在被外部拖拽,一般为用户正在用手指滚动
            public static final int SCROLL_STATE_DRAGGING = 1;

            //自动滚动开始
            public static final int SCROLL_STATE_SETTLING = 2;
             */
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if (newState == RecyclerView.SCROLL_STATE_IDLE && isLoadDataIng == false ) {
                    int lastVisibleItem = linearLayoutManager.findLastCompletelyVisibleItemPosition(); // 获取最后一个item的角标
                    int totalItemCount = linearLayoutManager.getItemCount(); // 获取item的总数
                    if (lastVisibleItem == (totalItemCount - 1)) { // 判断滑到最后一个item
                        if (!swipeRefreshLayout.isRefreshing()) { //不再下拉刷新状态
                            if (isScrollY) {  // 在Y轴（垂直方向）上有滑动
                                // TODO  执行上拉加载
                                onShowRefresh();
                                loadMoreData();
                            }
                        }
                    }
                }
            }

            /**
             *
             * @param recyclerView 当前滚动的view
             * @param dx  水平滚动距离
             * @param dy  垂直滚动距离
             */
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                if (dy > 0) {
                    isScrollY = true;
                }else{
                    isScrollY = false;
                }
            }
        });
    }

    /**加载数据*/
    public abstract void loadMoreData();

    /**显示加在更多的View*/
    protected void onShowRefresh() {
        isLoadDataIng = true; // 正在加载数据
        lists.add(dataBeanLoadMore);
        adapter.notifyDataSetChanged();
    }

    /**隐藏加在更多的View*/
    protected void onHintLoadMore() {
        lists.remove(dataBeanLoadMore);
        isLoadDataIng = false; // 不在加载数据
        adapter.notifyDataSetChanged();
    }
}

package com.example.fly.recyclerviewrefresh;

import android.os.Handler;
import android.os.Bundle;
import com.example.fly.recyclerviewrefresh.adapter.RecyclerAdapter;
import com.example.fly.recyclerviewrefresh.base.Refresh;
import com.example.fly.recyclerviewrefresh.base.RefreshActivity;
import com.example.fly.recyclerviewrefresh.bean.DataBean;

/**
 * 类名：
 * 类描述：RecyclerView刷新  方法二
 * 创建人：fly
 * 创建日期： 2017/2/2.
 * 版本：V1.0
 */
public class MainActivity extends RefreshActivity<DataBean,RecyclerAdapter>{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        for (int i = 0; i < 20; i++) {
            DataBean dataBean = new DataBean(Refresh.COMMON);
            dataBean.number = String.valueOf(i);
            lists.add(dataBean);
        }
        adapter = new RecyclerAdapter(lists,this);
        recyclerView.setAdapter(adapter);
    }

    @Override
    public void onRefresh() {
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                lists.clear();
                adapter.notifyDataSetChanged();
                swipeRefreshLayout.setRefreshing(false);
            }
        },1000);
    }

    @Override
    protected int setLayout() {return R.layout.activity_main;}

    @Override
    public DataBean createBean() {return new DataBean(Refresh.LOAD_MORE);}

    @Override
    public void loadMoreData() {
        for (int i = 0; i < 5; i++) {
            DataBean dataBean = new DataBean(Refresh.COMMON);
            dataBean.number = String.valueOf(i) + "fly";
            lists.add(dataBean);
        }
        adapter.notifyDataSetChanged();
        onHintLoadMore();
    }
}

demo下载