swipeRefreshLayout 上拉加载 下拉刷新

Main

 <android.support.v4.widget.SwipeRefreshLayout        android:layout_width="match_parent"        android:id="@+id/swipe"        android:layout_height="match_parent">        <android.support.v7.widget.RecyclerView            android:layout_width="match_parent"            android:layout_height="match_parent"            android:id="@+id/recycle"></android.support.v7.widget.RecyclerView>    </android.support.v4.widget.SwipeRefreshLayout>

item

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="55dp">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/tv"        android:layout_gravity="center"        android:textSize="16sp"        android:text="haahha"/>    <ImageView        android:layout_width="match_parent"        android:layout_height="1dp"        android:background="#8080"/></LinearLayout>

Main:

package test.bwie.com.lianximvp;

import android.os.Handler;
import android.service.autofill.Dataset;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
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 java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

List<String> list= new ArrayList<>();private SwipeRefreshLayout  swipeRefreshLayout;private RecyclerView recyclerView;private Myadater myadater;private LinearLayoutManager linearLayoutManager;private int lastVisibleItem;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe);    recyclerView = (RecyclerView) findViewById(R.id.recycle);    //创建数据    for(int  i = 0 ; i < 20 ;i ++){        list.add("第"+i+"条数据");    }    linearLayoutManager = new LinearLayoutManager(this);    recyclerView.setLayoutManager(linearLayoutManager);    myadater = new Myadater();    recyclerView.setAdapter(myadater);    swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {        @Override        public void onRefresh() {            new Handler().postDelayed(new Runnable() {                @Override                public void run() {                    List<String> newDatas = new ArrayList<String>();                    for(int j = 0 ; j < 5; j++){                        int index = j + 1;                        newDatas.add("new item" + index);                    }                    myadater.addItem(newDatas);                    swipeRefreshLayout.setRefreshing(false);                    Toast.makeText(MainActivity.this, "更新了", Toast.LENGTH_SHORT).show();                }            },3000);        }    });    //下拉加载    recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {        @Override        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {            super.onScrollStateChanged(recyclerView, newState);            int  i =    linearLayoutManager.findFirstVisibleItemPosition();            if(newState ==RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 ==myadater.getItemCount()){              new Handler().postDelayed(new Runnable() {                  @Override                  public void run() {                      List<String> newDatas = new ArrayList<String>();                      for (int i = 0; i< 5; i++) {                          int index = i +1;                          newDatas.add("more item" + index);                      }                      myadater.addMore(newDatas);                      myadater.notifyDataSetChanged();                  }              },2000);            }        }        @Override        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {            super.onScrolled(recyclerView,dx, dy);            lastVisibleItem =linearLayoutManager.findLastVisibleItemPosition();        }    });}class  Myadater extends RecyclerView.Adapter<Myadater.ViewHolder>{    private static final int TYPE_ITEM =0;  //普通Item View    private static final int TYPE_FOOTER = 1;  //顶部FootView    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        return new ViewHolder(LayoutInflater.from(MainActivity.this).inflate(R.layout.item,parent,false));    }    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        holder.text.setText(list.get(position));    }    @Override    public int getItemCount() {        return list!=null?list.size():0;    }    class ViewHolder extends RecyclerView.ViewHolder{        TextView text;        public ViewHolder(View itemView) {            super(itemView);            text =(TextView) itemView.findViewById(R.id.tv);        }    }    class Hander extends RecyclerView.ViewHolder{        TextView t;        public Hander(View itemView) {            super(itemView);            t = itemView.findViewById(R.id.tv1);        }    }    //   下拉刷新    public void addItem(List<String> newDatas){        newDatas.addAll(list);        list.removeAll(list);        list.addAll(newDatas);        notifyDataSetChanged();    }    //  上拉加载    public void addMore(List<String>  Dataset){        list.addAll(Dataset);        notifyDataSetChanged();    }    @Override    public int getItemViewType(int position) {        if(position + 1  ==getItemCount()){            return TYPE_FOOTER;        }        return TYPE_ITEM;    }}

}