RecycyleView SwipeRefrshLayout 使用

最新推荐文章于 2023-03-27 18:12:43 发布

原创最新推荐文章于 2023-03-27 18:12:43 发布 · 845 阅读

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#RecyclerView #SwipeRefrshLayout

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本文介绍了一个基于RecyclerView实现的下拉刷新及上拉加载更多的功能。通过自定义Adapter实现了不同类型的ViewHolder来区分列表项与加载提示，并利用SwipeRefreshLayout进行下拉刷新操作。

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1.布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <!--下拉刷新控件-->
    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe_refresh"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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


</LinearLayout>

2.Adapter

package com.example.liyn.foryou.recylerview;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.example.liyn.foryou.R;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Recylerview 适配器
 * Created by liyn on 2017/3/16.
 */

public class RecylerviewRefreshAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    Context mContext;
    LayoutInflater mInflater;
    List<String> mDatas;
    private static final int TYPE_ITEM = 0;
    private static final int TYPE_FOOTER = 1;

    //上拉加载更多
    public static final int PULLUP_LOAD_MORE = 0;
    //正在加载中
    public static final int LOADING_MORE = 1;
    //没有加载更多 隐藏
    public static final int NO_LOAD_MORE = 2;

    //上拉加载更多状态-默认为0
    private int mLoadMoreStatus = 0;


    public RecylerviewRefreshAdapter(Context context, List<String> datas) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
        mDatas = datas;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        if (viewType == TYPE_ITEM) {
            View itemView = mInflater.inflate(R.layout.recylerview_item, parent, false);

            return new ItemViewHolder(itemView);
        } else if (viewType == TYPE_FOOTER) {
            View itemView = mInflater.inflate(R.layout.load_more, parent, false);

            return new FooterViewHolder(itemView);
        }
        return null;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        if (holder instanceof ItemViewHolder) {

            ItemViewHolder itemViewHolder = (ItemViewHolder) holder;
            String str = mDatas.get(position);
            itemViewHolder.mTvContent.setText(str);

        } else if (holder instanceof FooterViewHolder) {

            FooterViewHolder footerViewHolder = (FooterViewHolder) holder;

            switch (mLoadMoreStatus) {
                case PULLUP_LOAD_MORE:
                    footerViewHolder.mTvLoadText.setText("上拉加载更多...");
                    break;
                case LOADING_MORE:
                    footerViewHolder.mTvLoadText.setText("正加载更多...");
                    break;
                case NO_LOAD_MORE:
                    //隐藏加载更多
                    footerViewHolder.mLoadLayout.setVisibility(View.GONE);
                    break;

            }
        }

    }

    @Override
    public int getItemCount() {
        //RecyclerView的count设置为数据总条数+ 1（footerView）
        return mDatas.size() + 1;
    }

    @Override
    public int getItemViewType(int position) {

        if (position + 1 == getItemCount()) {
            //最后一个item设置为footerView
            return TYPE_FOOTER;
        } else {
            return TYPE_ITEM;
        }
    }

    public class ItemViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.tv_text)
        TextView mTvContent;

        public ItemViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
            initListener(itemView);
        }

        private void initListener(View itemView) {
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(mContext, "poistion " + getAdapterPosition(), Toast.LENGTH_SHORT).show();
                }
            });
        }
    }

    public class FooterViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.pbLoad)
        ProgressBar mPbLoad;
        @BindView(R.id.tvLoadText)
        TextView mTvLoadText;
        @BindView(R.id.loadLayout)
        LinearLayout mLoadLayout;

        public FooterViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }

    /**
     * 更新加载更多状态
     *
     * @param status
     */
    public void changeMoreStatus(int status) {
        mLoadMoreStatus = status;
        notifyDataSetChanged();
    }

    //刷新数据
    public void refresh(List<String> list) {
        mDatas.clear();
        mDatas.addAll(list);
        notifyDataSetChanged();
    }

    //加载方法
    public void loadmore(List<String> list) {
        mDatas.addAll(list);
        notifyDataSetChanged();
    }
}

3.Activity

package com.example.liyn.foryou.recylerview;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
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.liyn.foryou.R;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Recyclerview 可以刷新 加载 使用
 * Created by liyn on 2017/3/16.
 */

public class RecyclerviewRefeshActivity extends Activity {


    @BindView(R.id.swipe_refresh)
    SwipeRefreshLayout swipeRefreshLayout;//刷新控件

    @BindView(R.id.recyclerview_list)
    RecyclerView recyclerView;//RecyclerView 列表

    RecylerviewRefreshAdapter adapter;//适配器
    List<String> stringList;//数据

    LinearLayoutManager linearLayoutManager;//布局管理器

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recylerview);
        ButterKnife.bind(this);

        initRecylerview();
        initSwipeRefreshLayout();
    }

    //初始化Recylerview
    void initRecylerview() {
        initData();
        //设置布局管理器
        linearLayoutManager = new LinearLayoutManager(this);
        //默认是垂直的
        recyclerView.setLayoutManager(linearLayoutManager);

        adapter = new RecylerviewRefreshAdapter(this, stringList);
        //设置Adapter
        recyclerView.setAdapter(adapter);

        //RecyclerView滑动监听
        recyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {

            int lastVisibleItem ;

            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                //判断RecyclerView的状态 是空闲时，同时，是最后一个可见的ITEM时才加载
                if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 == adapter.getItemCount()) {

                    //设置正在加载更多
                    adapter.changeMoreStatus(adapter.LOADING_MORE);

                    new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            List<String> newDatas = new ArrayList<>();
                            for (int i = 0; i < 5; i++) {
                                int index = i + 1;
                                newDatas.add("more item" + index);
                            }
                            adapter.loadmore(newDatas);
                            //设置回到上拉加载更多
                            adapter.changeMoreStatus(adapter.PULLUP_LOAD_MORE);
                        }
                    }, 1000);
                }
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                //最后一个可见的ITEM
                lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
            }
        });

    }

    //初始化SwipeRefreshLayout
    void initSwipeRefreshLayout(){
        swipeRefreshLayout.setColorSchemeResources(R.color.colorPrimary);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        List<String> newDatas = new ArrayList<>();
                        for (int i = 0; i < 20; i++) {
                            int index = i + 1;
                            newDatas.add("refresh item" + index);
                        }
                        adapter.refresh(newDatas);
                        swipeRefreshLayout.setRefreshing(false);
                    }
                }, 1000);
            }
        });
    }

    //添加数据
    private void initData() {
        stringList = new ArrayList<>();
        for (int i = 0; i < 40; i++) {
            stringList.add("item " + i);
        }
    }
}

4.item 布局文件

（recylerview_item.xml ）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:id="@+id/tv_text"
        android:gravity="center"
        android:text="我的世界"
        android:layout_height="30dp" />

</LinearLayout>

5.加载布局

（load_more.xml）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/loadLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="5dip"
        android:layout_marginTop="5dip"
        android:gravity="center">

        <ProgressBar
            android:id="@+id/pbLoad"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:layout_centerVertical="true"
            android:indeterminate="false" />

        <TextView
            android:id="@+id/tvLoadText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="4dip"
            android:layout_toRightOf="@id/pbLoad"
            android:clickable="true"
            android:text="魂牵梦萦 魂牵梦萦 "
            android:textColor="#000000"
            android:textSize="16sp" />
    </RelativeLayout>

</LinearLayout>