android SwipeRefreshLayout 实现 下拉刷新 上拉加载

上图

没有什么注释   没有demo 但是 思路清晰 好好理解看一下

xml

<?xml version="1.0" encoding="utf-8"?><android.support.v4.widget.SwipeRefreshLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/swipe_refresh_widget"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.jsu.whr.recyclerview.Main3Activity">    <android.support.v7.widget.RecyclerView        android:id="@+id/recycle_view"        android:layout_width="match_parent"        android:layout_height="wrap_content">    </android.support.v7.widget.RecyclerView></android.support.v4.widget.SwipeRefreshLayout>

主activity

package com.jsu.whr.recyclerview;import android.os.Handler;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 com.jsu.whr.myapplication.R;import java.util.ArrayList;import java.util.List;public class Main3Activity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {    SwipeRefreshLayout mSwipeRefreshLayout;    RecyclerView mRecyclerView;    MyAdapter adapter;    List<String> list = new ArrayList<String>();    LinearLayoutManager  mLayoutManager;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main3);        mSwipeRefreshLayout = (SwipeRefreshLayout) this.findViewById(R.id.swipe_refresh_widget);        mSwipeRefreshLayout.setColorSchemeResources(                R.color.black,                R.color.read,                R.color.green,                R.color.blue);        mSwipeRefreshLayout.setOnRefreshListener(this);//下拉监听        mRecyclerView = (RecyclerView) this.findViewById(R.id.recycle_view);        mLayoutManager = new LinearLayoutManager(this);        mRecyclerView.setLayoutManager(mLayoutManager);        mRecyclerView.setOnScrollListener(mOnScrollListener);        adapter = new MyAdapter(this);        mRecyclerView.setAdapter(adapter);    }    private RecyclerView.OnScrollListener mOnScrollListener = new RecyclerView.OnScrollListener() {        private int lastVisibleItem;//窗体可见最后一个item        @Override        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {            super.onScrollStateChanged(recyclerView, newState);            if (newState == RecyclerView.SCROLL_STATE_IDLE//滑动状态   SCROLL_STATE_IDLE表示停止                    && lastVisibleItem + 1 == adapter.getItemCount()                    && adapter.isShowFooter()) {//条件表示 滑到最底端了                //加载更多                    handler.postDelayed(new Runnable() {                        @Override                        public void run() {                            list.addAll(loadNewData());                            adapter.notifyDataSetChanged();                        }                    },1000);            }        }        @Override        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {            super.onScrolled(recyclerView, dx, dy);            lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();        }    };    @Override    public void onRefresh() {            handler.postDelayed(new Runnable() {                @Override                public void run() {                    if(list!=null){                        list.clear();                    }                    list.addAll(loadData());                    adapter.setDatalist(list);                    mSwipeRefreshLayout.setRefreshing(false);                }            },4000);    }    public List<String> loadData(){        List<String> listdata = new ArrayList<String>();        for(int i=0;i<20;i++){            list.add("---->"+i);        }        return listdata;    }    public List<String> loadNewData(){        List<String> listdata = new ArrayList<String>();        for(int i=0;i<20;i++){            list.add("---xin->"+i);        }        return listdata;    }   Handler handler = new Handler(){   };}

adapter

package com.jsu.whr.recyclerview;import android.content.Context;import android.support.v7.widget.RecyclerView;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.jsu.whr.myapplication.R;import java.util.ArrayList;import java.util.List;/** * Created by k90 on 2016-09-02. */public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{    ItemViewHolder mItemViewHolder;    List<String>Datalist = new ArrayList<String>();    Context context;    private boolean mShowFooter = true;    private static final int TYPE_ITEM = 0;    private static final int TYPE_FOOTER = 1;    public void setDatalist(List<String> datalist) {        Datalist = datalist;        this.notifyDataSetChanged();    }    public MyAdapter(Context context) {        this.context = context;    }    @Override    public int getItemViewType(int position) {        // 最后一个item设置为footerView        if(!mShowFooter) {            return TYPE_ITEM;        }        if (position + 1 == getItemCount()) {            return TYPE_FOOTER;        } else {            return TYPE_ITEM;        }    }    public boolean isShowFooter() {        return this.mShowFooter;    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {        if(viewType == TYPE_ITEM) {            View view = LayoutInflater.from(context).inflate(R.layout.items, viewGroup, false);            mItemViewHolder = new ItemViewHolder(view);            return mItemViewHolder;        }        else{            View view = LayoutInflater.from(viewGroup.getContext()).inflate(                    R.layout.footer, null);            view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,                    ViewGroup.LayoutParams.WRAP_CONTENT));            return new FooterViewHolder(view);        }    }    @Override    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) {        if(viewHolder instanceof ItemViewHolder) {            String s = Datalist.get(i);            if (s == null) {                return;            }            ((ItemViewHolder) viewHolder).tv.setText(s);        }    }    @Override    public int getItemCount() {        return Datalist.size();    }    public class FooterViewHolder extends RecyclerView.ViewHolder {        public FooterViewHolder(View view) {            super(view);        }    }    public void isShowFooter(boolean showFooter) {        this.mShowFooter = showFooter;    }    class ItemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{        TextView tv;        public ItemViewHolder(View itemView) {            super(itemView);            tv = (TextView) itemView.findViewById(R.id.tv);            tv.setOnClickListener(this);        }        @Override        public void onClick(View v) {            if(mOnItemClickListtenet!=null){                mOnItemClickListtenet.onItemClick(v,this.getPosition());            }        }    }    OnItemClickListtenet mOnItemClickListtenet;    public interface OnItemClickListtenet{        void onItemClick(View v ,int position);    }    public void setmOnItemClickListtenet(OnItemClickListtenet mOnItemClickListtenet) {        this.mOnItemClickListtenet = mOnItemClickListtenet;    }}

底部layout

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/load_layout"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:gravity="center"    android:orientation="horizontal"    android:paddingBottom="12dip"    android:paddingTop="12dip" >    <ProgressBar        style="?android:attr/progressBarStyleSmall"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/more_data_msg"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="16sp"        android:layout_marginLeft="10dp"        android:text="正在加载..." /></LinearLayout>