RecyclerView实现上下拉刷新

在ListView的时代，上下拉刷新可以给ListView添加一个头布局和尾布局来实现，通过对滑动动作进行动态监测,实现页面刷新的效果
像主流的第三方的XListView和PullToListView都是通过这样的方式来实现的上下拉的刷新效果，最近我注意到像内涵段子和知乎这两个app使用了一种新的刷新效果,一查才知道他们是使用了Google新推出的一个控件SwipeRefreshLayout来实现的下拉刷新效果，因为此控件内部只允许添加一个子View，所以我们可以在其中加入一个ListView或者（RecyclerView）或者一个Layout来实现下拉刷新的效果
至于上拉加载 ,可以在适配器中动态判断

拿到可见的最后一个条目 int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();

package com.longyue.recyclerviewreflesh3;

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.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import butterknife.ButterKnife;
import butterknife.InjectView;

/** * @author Leo */
public class MainActivity extends AppCompatActivity {


    @InjectView(R.id.toolbar)
    Toolbar toolbar;
    @InjectView(R.id.recyclerView)
    RecyclerView recyclerView;
    @InjectView(R.id.SwipeRefreshLayout)
    SwipeRefreshLayout swipeRefreshLayout;

    boolean isLoading;
    private List<Map<String, Object>> data = new ArrayList<>();
    private RecyclerViewAdapter adapter = new RecyclerViewAdapter(this, data);
    private Handler handler = new Handler();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_notice);
        ButterKnife.inject(this);
        initView();
        initData();
    }

    public void initView() {
        setSupportActionBar(toolbar);
        toolbar.setTitle(R.string.notice);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

        swipeRefreshLayout.setColorSchemeResources(R.color.blueStatus);
        swipeRefreshLayout.post(new Runnable() {
            @Override
            public void run() {
                swipeRefreshLayout.setRefreshing(true);
            }
        });

        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        data.clear();
                        getData();
                    }
                }, 2000);
            }
        });
        final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(adapter);
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                Log.d("test", "StateChanged = " + newState);


            }

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

                int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
                if (lastVisibleItemPosition + 1 == adapter.getItemCount()) {
                    Log.d("test", "loading executed");

                    boolean isRefreshing = swipeRefreshLayout.isRefreshing();
                    if (isRefreshing) {
                        adapter.notifyItemRemoved(adapter.getItemCount());
                        return;
                    }
                    if (!isLoading) {
                        isLoading = true;
                        handler.postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                getData();
                                Log.d("test", "load more completed");
                                isLoading = false;
                            }
                        }, 1000);
                    }
                }
            }
        });

        //添加点击事件
        adapter.setOnItemClickListener(new RecyclerViewAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                Log.d("test", "item position = " + position);
            }

            @Override
            public void onItemLongClick(View view, int position) {

            }
        });
    }


    public void initData() {
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                getData();
            }
        }, 1500);

    }

    /** * 获取测试数据 */
    private void getData() {
        for (int i = 0; i < 6; i++) {
            Map<String, Object> map = new HashMap<>();
            data.add(map);
        }
        adapter.notifyDataSetChanged();
        swipeRefreshLayout.setRefreshing(false);
        adapter.notifyItemRemoved(adapter.getItemCount());
    }


}

package com.longyue.recyclerviewreflesh3;

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

import java.util.List;

public class RecyclerViewAdapter extends Adapter<ViewHolder> {

    private static final int TYPE_ITEM = 0;
    private static final int TYPE_FOOTER = 1;
    private Context context;
    private List data;


    public RecyclerViewAdapter(Context context, List data) {
        this.context = context;
        this.data = data;
    }

    public interface OnItemClickListener {
        void onItemClick(View view, int position);

        void onItemLongClick(View view, int position);
    }

    private OnItemClickListener onItemClickListener;

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

    @Override
    public int getItemCount() {
        return data.size() == 0 ? 0 : data.size() + 1;
    }

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

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == TYPE_ITEM) {
            View view = LayoutInflater.from(context).inflate(R.layout.item_base, parent,
                    false);
            return new ItemViewHolder(view);
        } else if (viewType == TYPE_FOOTER) {
            View view = LayoutInflater.from(context).inflate(R.layout.item_foot, parent,
                    false);
            return new FootViewHolder(view);
        }
        return null;
    }


    @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        if (holder instanceof ItemViewHolder) {
            //holder.tv.setText(data.get(position));
            if (onItemClickListener != null) {
                holder.itemView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        int position = holder.getLayoutPosition();
                        onItemClickListener.onItemClick(holder.itemView, position);
                    }
                });

                holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View v) {
                        int position = holder.getLayoutPosition();
                        onItemClickListener.onItemLongClick(holder.itemView, position);
                        return false;
                    }
                });
            }
        }
    }


    static class ItemViewHolder extends ViewHolder {

        TextView tv;

        public ItemViewHolder(View view) {
            super(view);
            tv = (TextView) view.findViewById(R.id.tv_date);
        }
    }

    static class FootViewHolder extends ViewHolder {

        public FootViewHolder(View view) {
            super(view);
        }
    }
}

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