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;

@Override
protected 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;
}

}

}