Android RecyclerView上拉加载和下拉刷新

之前写过一篇刷新加载《RecyclerView上拉加载和下拉刷新（基础版）》 ，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();
}
}

源码下载：RecyclerViewRefresh刷新加载