MaterialRefreshLayout实现下拉刷新上拉加载更多

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通过本文可以了解以下几方面:

  • 1、MaterialRefreshLayout是什么
  • 2、MaterialRefreshLayout怎么使用
  • 3、一个简单的小小demo带你实现下拉刷新上拉加载更多

首先看下效果图:
这里写图片描述

MaterialRefreshLayout是什么

  • 项目地址: https://github.com/android-cjj/Android-MaterialRefreshLayout

  • 简介:这是一个下拉刷新控件,它比SwipeRefreshLayout更漂亮和强大,使用也比较简单。支持android 3.0 以上。希望你喜欢,呵呵。

用法介绍(摘自官方文档)

AS添加依赖库,这样就不用导入整个library库,Eclipse的用户导入library库,慢慢折腾吧!(因为我觉得如果不是环境不允许你用as的话,还是放弃eclipse吧,毕竟github上很多优秀的项目都是用as的,好吧我多嘴了…)

dependencies {    compile 'com.cjj.materialrefeshlayout:library:1.3.0'}

在你的layout xml.添加下面的代码:

<com.cjj.MaterialRefreshLayout    android:id="@+id/refresh"    android:layout_width="match_parent"    android:layout_height="match_parent"    >    <!--在这里我们可以添加ListView OR GridView OR RecycleView OR ScrollView OR 更多-->      <...ListView or GridView or RecyclerView or ScrollView and more...></com.cjj.MaterialRefreshLayout>

在java中实现以下代码:

materialRefreshLayout = (MaterialRefreshLayout) findViewById(R.id...);materialRefreshLayout.setMaterialRefreshListener(new MaterialRefreshListener() {      @Override      public void onRefresh(final MaterialRefreshLayout materialRefreshLayout) {          //下拉刷新...      }       @Override       public void onRefreshLoadMore(MaterialRefreshLayout materialRefreshLayout) {          //上拉加载更多...       }  }// 结束下拉刷新...materialRefreshLayout.finishRefresh();// 结束上拉刷新... materialRefreshLayout.finishRefreshLoadMore();

下拉效果配置(官方提供了6中下拉效果,这里提供本例子中使用的,如果想要了解更多,请去官方查看)

    <com.cjj.MaterialRefreshLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/refresh"        app:overlay="false"        app:wave_show="true"        app:wave_color="@color/material_green"        app:wave_height_type="higher"    >

好了,不多说,看代码吧。(一切还是以代码为主啊,只有代码实现了功能,才是王道)

MainActivity.java:

package com.example.materialrefreshlayoutdemo;import android.os.Bundle;import android.os.Handler;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.DefaultItemAnimator;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.widget.Toast;import com.cjj.MaterialRefreshLayout;import com.cjj.MaterialRefreshListener;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private MaterialRefreshLayout mRefreshLayout;    private RecyclerView mRecyclerView;    /**     * 刚初始化的数据     */    private List<String> datas = new ArrayList<>();    /**     * 一个承接数据的数组     */    private List<String> mList = new ArrayList<>();    private MyAdapter mAdapter;    /**     * 在上拉刷新的时候,判断,是否处于上拉刷新,如果是的话,就禁止在一次刷新,保障在数据加载完成之前     * 避免重复和多次加载     */    private boolean isLoadMore = true;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initDatas();    }    /**     * 初始化布局控件     */    private void initView() {        mRefreshLayout = (MaterialRefreshLayout) findViewById(R.id.refresh);        mRecyclerView = (RecyclerView) findViewById(R.id.recycleview);        initRefresh();    }    /**     * 初始化加载     */    private void initRefresh() {        mAdapter = new MyAdapter(datas);        mRecyclerView.setAdapter(mAdapter);           //下面可以自己设置默认动画        mRecyclerView.setItemAnimator(new DefaultItemAnimator());           //下面可以自己设置排版方式        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));        /**         * 设置是否上拉加载更多,默认是false,要手动改为true,要不然不会出现上拉加载         */        mRefreshLayout.setLoadMore(isLoadMore);        //设置分割线        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST));        mRefreshLayout.setMaterialRefreshListener(new MaterialRefreshListener() {            /**             * 刷新的方法,我这里演示的是下拉刷新,因为没有数据,我这里也就只是toast一下             * 如果想要实现你们自己要的结果,就会在定义一个方法,获取最新数据,或者是在次             * 在这里调用之前获取数据的方法,以达到刷新数据的功能             * @param materialRefreshLayout             */            @Override            public void onRefresh(MaterialRefreshLayout materialRefreshLayout) {                //一般加载数据都是在子线程中,这里我用到了handler                new Handler().postDelayed(new Runnable() {                    @Override                    public void run() {                        Toast.makeText(MainActivity.this, "已经没有更多数据了", Toast.LENGTH_SHORT).show();                        /**                         * 刷新完成后调用此方法,要不然刷新效果不消失                         */                        mRefreshLayout.finishRefresh();                    }                }, 3000);            }            /**             * 上拉加载更多的方法,在这里我只是简单的模拟了加载四条数据             * 真正用的时候,就会去定义方法,获取数据,一般都是分页,在数据端获取的时候             * 把页数去增加一,然后在去服务端去获取数据             * @param materialRefreshLayout             */            @Override            public void onRefreshLoadMore(MaterialRefreshLayout materialRefreshLayout) {                new Handler().postDelayed(new Runnable() {                    @Override                    public void run() {                        isLoadMore = false;                        for (int i = 0; i <= 3; i++) {                            mList.add(i, "new City " + i);                        }                        //通知刷新                        mAdapter.addLists(mAdapter.getLists().size(), mList);                        //mRecyclerView.scrollToPosition(mAdapter.getLists().size());                        /**                         * 完成加载数据后,调用此方法,要不然刷新的效果不会消失                         */                        mRefreshLayout.finishRefreshLoadMore();                    }                }, 3000);            }        });    }    /**     * 初始化数据     */    private void initDatas() {        datas.add("New York");        datas.add("Bei Jing");        datas.add("Boston");        datas.add("London");        datas.add("San Francisco");        datas.add("Chicago");        datas.add("Shang Hai");        datas.add("Tian Jin");        datas.add("Zheng Zhou");        datas.add("Hang Zhou");        datas.add("Guang Zhou");        datas.add("Fu Gou");        datas.add("Zhou Kou");    }}

MyAdapter.java:

package com.example.materialrefreshlayoutdemo;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import java.util.List;/** * Created by 若兰 on 2016/1/26. * 一个懂得了编程乐趣的小白,希望自己 * 能够在这个道路上走的很远,也希望自己学习到的 * 知识可以帮助更多的人,分享就是学习的一种乐趣 * QQ:1069584784 * csdn:http://blog.csdn.net/wuyinlei */public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {    /**     * 加载布局的     */    private LayoutInflater mInflater;    /**     * 用来存放数据的集合     */    private List<String> mLists;    /**     * 自定义的item点击(在这里没有用到)     */    private OnItemClickListener mListener;    /**     * mListener get方法     * @return     */    public OnItemClickListener getListener() {        return mListener;    }    /**     * mListener set方法     * @param listener     */    public void setListener(OnItemClickListener listener) {        mListener = listener;    }    /**     * mLists集合的get方法  通过他可以取得数据的size();     * @return     */    public List<String> getLists() {        return mLists;    }    /**     * 对以下方法的复用     * @param lists     */    public void addLists(List<String> lists) {        addLists(0, lists);    }    /**     * 添加数据     * @param position  添加的位置     * @param lists   添加的数据     */    public void addLists(int position, List<String> lists) {        //mLists = lists;        if (lists != null && lists.size() > 0) {            mLists.addAll(lists);            /**             * Notify any registered observers that the <code>itemCount</code> items starting at             * position <code>positionStart</code> have changed.             *             * 通知item是从哪个地方到哪个地方已经改变了             */            notifyItemRangeChanged(position, mLists.size());        }    }    /**     * 构造方法,通过new对象的时候传入数据     * @param items     */    public MyAdapter(List<String> items) {        mLists = items;    }    // 创建ViewHolder ,相当于ListVie Adapter 的getView 方法    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        mInflater = LayoutInflater.from(parent.getContext());        View view = mInflater.inflate(R.layout.list_item, null);        return new MyViewHolder(view);    }    /**     * 绑定数据     * @param holder     * @param position     */    @Override    public void onBindViewHolder(MyViewHolder holder, int position) {        holder.tv_text.setText(mLists.get(position));    }    @Override    public int getItemCount() {        return mLists.size();    }    class MyViewHolder extends RecyclerView.ViewHolder {        private TextView tv_text;        public MyViewHolder(View itemView) {            super(itemView);            tv_text = (TextView) itemView.findViewById(R.id.tv_item);            /**             * 如果我们想要实现item的点击事件,就要在这处理,因为recycleview             * 并没有给我们提供直接的点击触摸事件,这个也是他的好处(也可以理解为不好的地方)             */            tv_text.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    if (mListener != null) {                        mListener.onClick(v, getLayoutPosition(), mLists.get(getLayoutPosition()));                    }                }            });        }    }    //RecycleView的事件监听,这个要自己去写,里面的参数也是根据自己的需要去定义    //不像listview中,已经有了item的点击监听事件    interface OnItemClickListener {        //自己定义        void onClick(View v, int position, String item);    }}

activity_main.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="match_parent"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:orientation="vertical">    <com.cjj.MaterialRefreshLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/refresh"        app:overlay="false"        app:wave_show="true"        app:wave_color="@color/material_green"        app:wave_height_type="higher"    >        <android.support.v7.widget.RecyclerView            android:layout_width="match_parent"            android:id="@+id/recycleview"            android:layout_height="match_parent">        </android.support.v7.widget.RecyclerView>    </com.cjj.MaterialRefreshLayout></LinearLayout>

item_list.xml:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:layout_width="match_parent"              android:layout_height="match_parent"              android:orientation="vertical"              >    <TextView        android:id="@+id/tv_item"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:padding="10dp"        android:text="1"        android:gravity="center"        android:textColor="#000"        android:textSize="20dp"/></RelativeLayout>

DividerItemDecoration.java(这个网上找的):

package com.example.materialrefreshlayoutdemo;/** * Created by ruolan on 2015/11/11. *//* * Copyright (C) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.View;/** * This class is from the v7 samples of the Android SDK. It's not by me! * <p/> * See the license above for details. */public class DividerItemDecoration extends RecyclerView.ItemDecoration{    private static final int[] ATTRS = new int[] { android.R.attr.listDivider };    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;    private Drawable mDivider;    private int mOrientation;    public DividerItemDecoration(Context context, int orientation)    {        final TypedArray a = context.obtainStyledAttributes(ATTRS);        mDivider = a.getDrawable(0);        a.recycle();        setOrientation(orientation);    }    public void setOrientation(int orientation)    {        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST)        {            throw new IllegalArgumentException("invalid orientation");        }        mOrientation = orientation;    }    @Override    public void onDraw(Canvas c, RecyclerView parent)    {        if (mOrientation == VERTICAL_LIST) {            drawVertical(c, parent);        } else {            drawHorizontal(c, parent);        }    }    public void drawVertical(Canvas c, RecyclerView parent)    {        final int left = parent.getPaddingLeft();        final int right = parent.getWidth() - parent.getPaddingRight();        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++)        {            final View child = parent.getChildAt(i);            RecyclerView v = new RecyclerView(                    parent.getContext());            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child                    .getLayoutParams();            final int top = child.getBottom() + params.bottomMargin;            final int bottom = top + mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    public void drawHorizontal(Canvas c, RecyclerView parent)    {        final int top = parent.getPaddingTop();        final int bottom = parent.getHeight() - parent.getPaddingBottom();        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++)        {            final View child = parent.getChildAt(i);            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child                    .getLayoutParams();            final int left = child.getRight() + params.rightMargin;            final int right = left + mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    @Override    public void getItemOffsets(Rect outRect, int itemPosition,                               RecyclerView parent)    {        if (mOrientation == VERTICAL_LIST)        {            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());        } else        {            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);        }    }}

好了,一个简单的上拉加载更多和下拉刷新就完成了,如果有兴趣,可以参考一下这个文章
RecycleView+SwipeRefreshLayout 实现下拉刷新地址:

  • http://blog.csdn.net/wuyinlei/article/details/49805567

MaterialRefreshLayout实现下拉刷新上拉加载更多项目的github地址:

  • https://github.com/wuyinlei/MaterialRefreshLayoutDemo
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