文/程序员男神

前言

本周被派遣到上海出差，去医院演示项目，收集收集医院的需求；大早上起得比平时早了那么一会，就感觉一天有点疲乏。晚上到了，突然精神来了，写篇文章压压惊。说实话，上拉刷新、下拉加载功能很常用，也很常见，但是需要自己开发时，却感觉那么多不知道选用哪个了？记录下来，让自己在刷新面前不在迷茫。

aj

概述

先上效果图:上拉刷新，下拉加载的功能。

效果图
废话不多说，先给出两个项目的地址：
下拉刷新
https://github.com/liaohuqiu/android-Ultra-Pull-To-Refresh
上拉刷新、上拉加载更多
https://github.com/captainbupt/android-Ultra-Pull-To-Refresh-With-Load-More/blob/master/README-cn.md

实现步骤

只讲使用方法，不扯淡，就是那么认真。

1、参数说明

• 在旧版本中，ptr_duration_to_close是指回到刷新状态的事件。另外ptr_duration_to_close_header代表回到开始状态（不可见）的事件。这两个属性有点类似，因此可能造成误解，特别是在添加了footer之后。所以，在新版本中，ptr_duration_to_close被删除，而使用ptr_duration_to_back_refresh作为替代。同时，也加入了ptr_duration_to_back_header和ptr_duration_to_back_footer来区分头部和脚部。
• 新版本中，添加ptr_duration_to_close_either代表回到开始状态（不可见）的事件。
• 针对ptr_resistance，也分别添加ptr_resistance_header和ptr_resistance_footer。

2、添加的方法和类

• setFooterView：对应于setHeaderView()。在set完footer后，你需要调用 addPtrUIHandler()，这和设置header的机制是一样的。
• PtrHandler2：原有PtrHandler类的一个补充。当需要使用上拉加载更多的时候，你应该调用setPtrHandler(new PtrHandler2())，而不是setPtrHandler(new PtrHandler())。
• PtrDefaultHandler2：实现了默认的 checkCanDoLoadMore() 逻辑，可以适用于大部分的View。机制和PtrDefaultHandler一致。
• PtrClassicDefaultFooter：默认的footer，将默认header反转了过来。
• setMode(Mode): Mode是本分支的一个新特性。通过调用setMode, 你可以任意的开启/关闭header或者footer。参数类型是一个枚举变量，可以通过以下方式调用：setMode(Mode.BOTH)。

3、使用方法

首先，在gradle中:

compile 'in.srain.cube:ptr-load-more:1.0.6'

下面是布局文件，activity_main.xml：

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

    <in.srain.cube.views.ptr.PtrClassicFrameLayout
        android:id="@+id/ptr_classic_frame_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#FFFFFF"
        app:ptr_duration_to_back_refresh="200"
        app:ptr_duration_to_close_footer="1000"
        app:ptr_duration_to_close_header="1000"
        app:ptr_keep_header_when_refresh="true"
        app:ptr_pull_to_fresh="false"
        app:ptr_ratio_of_header_height_to_refresh="1.2"
        app:ptr_resistance="1.7">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycle_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </in.srain.cube.views.ptr.PtrClassicFrameLayout>

</LinearLayout>

接下来就是我们的adapter的代码：

package com.winning.health.rims.recoverydemo.adapter;

import android.app.Activity;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.winning.health.rims.recoverydemo.R;
import com.winning.health.rims.recoverydemo.model.Project;
import com.winning.health.rims.recoverydemo.view.SlidingButtonView;

import java.util.List;

/**
 * desc: adapter
 * author：djj on 2017/7/3 12:49
 * 简书：http://www.jianshu.com/u/dfbde65a03fc
 */
public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.MyViewHolder> implements SlidingButtonView.IonSlidingButtonListener {

    private List<Project> data;
    private Context mContext;
    private SlidingButtonView mMenu = null;

    public RecycleAdapter(List<Project> data, Context mContext) {
        this.data = data;
        this.mContext = mContext;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list, parent, false);
        MyViewHolder myViewHolder = new MyViewHolder(view);
        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, int position) {

        //将数据填充到具体的view中
        holder.itemTitle.setText(data.get(position).getItemTitle());
        holder.itemDuration.setText(data.get(position).getItemDuration() + "");
        holder.startTask.setText(data.get(position).getStartTask());
        holder.tvDelete.setText(data.get(position).getTvDelete());

        //设置内容布局的宽为屏幕宽度
        DisplayMetrics metrics = new DisplayMetrics();
        ((Activity) mContext).getWindowManager().getDefaultDisplay().getMetrics(metrics);
        int width = metrics.widthPixels;
        holder.layoutContent.getLayoutParams().width = width;

        // 如果设置了回调，则设置点击事件
        if (mIDeleteBtnClickListener != null) {
            holder.startTask.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int n = holder.getLayoutPosition();
                    mIDeleteBtnClickListener.onStartItemClick(view, holder, n);
                }
            });
            holder.layoutContent.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    //判断侧滑是否打开
                    if (menuIsOpen()) {
                        closeMenu();
                    } else {
                        int n = holder.getLayoutPosition();
                        mIDeleteBtnClickListener.onDeleteBtnClick(view, holder, n);
                    }
                }
            });
            holder.tvDelete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int n = holder.getLayoutPosition();
                    mIDeleteBtnClickListener.onDeleteBtnClick(view, holder, n);
                }
            });
        }
    }

    @Override
    public int getItemCount() {
        if (data != null) {
            return data.size();
        }
        return 0;
    }

    /**
     * 删除菜单打开信息接收
     */
    @Override
    public void onMenuIsOpen(View view) {
        mMenu = (SlidingButtonView) view;
    }

    /**
     * 滑动或者点击了Item监听
     *
     * @param slidingButtonView
     */
    @Override
    public void onDownOrMove(SlidingButtonView slidingButtonView) {
        if (menuIsOpen()) {
            if (mMenu != slidingButtonView) {
                closeMenu();
            }
        }
    }

    /**
     * 关闭菜单
     */
    public void closeMenu() {
        mMenu.closeMenu();
        mMenu = null;
    }

    /**
     * 判断是否有菜单打开
     */
    public Boolean menuIsOpen() {
        if (mMenu != null) {
            return true;
        }
        return false;
    }


    /**
     * 定义接口回调
     */
    private IonSlidingViewClickListener mIDeleteBtnClickListener;

    public void setOnSlidingViewClickListener(IonSlidingViewClickListener listener) {
        this.mIDeleteBtnClickListener = listener;
    }

    public interface IonSlidingViewClickListener {
        void onStartItemClick(View view, MyViewHolder holder, int position);

        void onDeleteBtnClick(View view, MyViewHolder holder, int position);
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {

        public TextView itemTitle;
        public TextView itemDuration;
        public TextView startTask;
        public TextView tvDelete;
        public ViewGroup layoutContent;

        public MyViewHolder(View itemView) {
            super(itemView);
            itemTitle = itemView.findViewById(R.id.item_title);
            itemDuration = itemView.findViewById(R.id.item_duration);
            startTask = itemView.findViewById(R.id.start_task);
            tvDelete = itemView.findViewById(R.id.tv_delete);
            layoutContent = itemView.findViewById(R.id.layout_content);
            ((SlidingButtonView) itemView).setSlidingButtonListener(RecycleAdapter.this);

        }
    }
}

接下来贴出item的xml代码item_list.xml：

<?xml version="1.0" encoding="utf-8"?>
<com.winning.health.rims.recoverydemo.view.SlidingButtonView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="70dp"
    android:background="@android:color/white">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <RelativeLayout
            android:id="@+id/layout_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="12dp"
                android:layout_marginTop="12dp"
                android:background="@color/white"
                android:descendantFocusability="blocksDescendants"
                android:gravity="center_vertical"
                android:orientation="horizontal">

                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center_vertical"
                    android:orientation="vertical">

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="center_vertical"
                        android:orientation="horizontal">

                        <TextView
                            android:id="@+id/item_title"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_marginLeft="10dp"
                            android:layout_weight="1"
                            android:text="推拿"
                            android:textColor="@color/textColor"
                            android:textSize="14sp" />

                        <TextView
                            android:id="@+id/item_duration"
                            style="@style/itemTextStyle"
                            android:layout_width="0dp"
                            android:layout_marginLeft="30dp"
                            android:layout_weight="0.5"
                            android:text="00:45:00" />
                    </LinearLayout>

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="center_vertical"
                        android:orientation="horizontal">

                        <TextView
                            android:id="@+id/item_patient_name"
                            style="@style/itemTextStyle"
                            android:layout_width="0dp"
                            android:layout_marginLeft="10dp"
                            android:layout_weight="0.5"
                            android:text="李青" />


                        <TextView
                            android:id="@+id/item_patient_age"
                            style="@style/itemTextStyle"
                            android:layout_width="wrap_content"
                            android:text="26岁" />

                        <TextView
                            android:id="@+id/item_patient_sex"
                            style="@style/itemTextStyle"
                            android:layout_width="0dp"
                            android:layout_weight="0.5"
                            android:text="男" />

                        <TextView
                            android:id="@+id/item_patient_num"
                            style="@style/itemTextStyle"
                            android:layout_width="0dp"
                            android:layout_weight="0.5"
                            android:text="20170511" />
                    </LinearLayout>

                </LinearLayout>

                <TextView
                    android:id="@+id/start_task"
                    android:layout_width="45dp"
                    android:layout_height="45dp"
                    android:layout_marginLeft="10dp"
                    android:layout_marginRight="10dp"
                    android:background="@drawable/button_back"
                    android:focusable="true"
                    android:focusableInTouchMode="false"
                    android:gravity="center"
                    android:text="开始"
                    android:textSize="12sp" />
            </LinearLayout>
        </RelativeLayout>

        <TextView
            android:id="@+id/tv_delete"
            android:layout_width="80dp"
            android:layout_height="match_parent"
            android:layout_toEndOf="@+id/layout_content"
            android:layout_toRightOf="@+id/layout_content"
            android:background="@color/red"
            android:gravity="center"
            android:text="取 消"
            android:textColor="@color/white" />
    </RelativeLayout>

</com.winning.health.rims.recoverydemo.view.SlidingButtonView>

实体类Project的代码,set、get方法自己添加：

package com.winning.health.rims.recoverydemo.model;

/**
 * desc: 治疗项目实体类
 * <p>
 * author：djj
 * <p>
 * date: 2017/7/3 13:12
 * <p>
 * blog：http://www.jianshu.com/u/dfbde65a03fc
 */

public class Project {

    private String itemTitle;
    private int itemDuration;
    private String startTask;
    private String tvDelete;
}

由于这是在有滑动删除的Recycleview代码基础上添加的刷新，所以也把滑动的自定义贴出来：

package com.winning.health.rims.recoverydemo.view;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.HorizontalScrollView;
import android.widget.TextView;

import com.winning.health.rims.recoverydemo.R;

/**
 * desc: 侧滑按钮自定义
 * author: dj
 * date: 2017/3/10 10:01
 */

public class SlidingButtonView extends HorizontalScrollView {

    private TextView mTextView_Delete;
    private int mScrollWidth;
    private Boolean isOpen = false;
    private Boolean once = false;

    public SlidingButtonView(Context context) {
        this(context, null);
    }

    public SlidingButtonView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SlidingButtonView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.setOverScrollMode(OVER_SCROLL_NEVER);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (!once) {
            mTextView_Delete = (TextView) findViewById(R.id.tv_delete);
            once = true;
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        if (changed) {
            this.scrollTo(0, 0);
            //获取水平滚动条可以滑动的范围，即右侧按钮的宽度
            mScrollWidth = mTextView_Delete.getWidth();
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        int action = ev.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_MOVE:
                mIonSlidingButtonListener.onDownOrMove(this);
                break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                changeScrollx();
                return true;
            default:
                break;
        }
        return super.onTouchEvent(ev);
    }

    /**
     * 按滚动条被拖动距离判断关闭或打开菜单
     */
    public void changeScrollx() {
        if (getScrollX() >= (mScrollWidth / 2)) {
            this.smoothScrollTo(mScrollWidth, 0);
            isOpen = true;
            mIonSlidingButtonListener.onMenuIsOpen(this);
        } else {
            this.smoothScrollTo(0, 0);
            isOpen = false;
        }
    }

    /**
     * 打开菜单
     */
    public void openMenu() {
        if (isOpen) {
            return;
        }
        this.smoothScrollTo(mScrollWidth, 0);
        isOpen = true;
        mIonSlidingButtonListener.onMenuIsOpen(this);
    }

    /**
     * 关闭菜单
     */
    public void closeMenu() {
        if (!isOpen) {
            return;
        }
        this.smoothScrollTo(0, 0);
        isOpen = false;
    }

    private IonSlidingButtonListener mIonSlidingButtonListener;

    public void setSlidingButtonListener(IonSlidingButtonListener listener) {
        this.mIonSlidingButtonListener = listener;
    }

    public interface IonSlidingButtonListener {
        void onMenuIsOpen(View view);

        void onDownOrMove(SlidingButtonView slidingButtonView);
    }
}

最后就是我们的activity的代码，Mainactivity.java:

package com.winning.health.rims.recoverydemo.activity;

import android.graphics.Color;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Toast;

import com.winning.health.rims.recoverydemo.R;
import com.winning.health.rims.recoverydemo.adapter.RecycleAdapter;
import com.winning.health.rims.recoverydemo.model.Project;

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

import in.srain.cube.views.ptr.PtrClassicDefaultFooter;
import in.srain.cube.views.ptr.PtrClassicDefaultHeader;
import in.srain.cube.views.ptr.PtrClassicFrameLayout;
import in.srain.cube.views.ptr.PtrDefaultHandler2;
import in.srain.cube.views.ptr.PtrFrameLayout;
import in.srain.cube.views.ptr.PtrHandler2;
import in.srain.cube.views.ptr.util.PtrLocalDisplay;

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private RecycleAdapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    private List<Project> projectList;
    private PtrClassicFrameLayout ptrClassicLayout;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initDate();
        initView();


    }

    //初始化数据
    private void initDate() {
        projectList = new ArrayList<Project>();
        for (int i = 0; i < 20; i++) {
            Project project = new Project();
            project.setItemTitle("微波治疗");
            project.setItemDuration(10);
            project.setStartTask("开始");
            project.setTvDelete("取消");
            projectList.add(project);
        }
    }

    //初始化控件
    private void initView() {
        mRecyclerView = (RecyclerView) findViewById(R.id.recycle_view);
        ptrClassicLayout = (PtrClassicFrameLayout) findViewById(R.id.ptr_classic_frame_layout);
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
        mLayoutManager = new LinearLayoutManager(this);
        mRecyclerView.setLayoutManager(mLayoutManager);
        mAdapter = new RecycleAdapter(projectList, MainActivity.this);
        mRecyclerView.setAdapter(mAdapter);
        mAdapter.setOnSlidingViewClickListener(new RecycleAdapter.IonSlidingViewClickListener() {
            @Override
            public void onStartItemClick(View view, final RecycleAdapter.MyViewHolder holder, int position) {
                //判断状态调收费接口
                CountDownTimer timer = new CountDownTimer((20 * 1000), 1000) {
                    @Override
                    public void onTick(long l) {
                        holder.itemDuration.setText(l / 1000 + "");
                        holder.startTask.setBackgroundResource(R.drawable.button_load_back);
                        holder.startTask.setTextColor(Color.parseColor("#0BC0BA"));
                        holder.startTask.setText("进行");

                    }

                    @Override
                    public void onFinish() {
                        holder.itemDuration.setText("00:00:00");
                        holder.startTask.setBackgroundResource(R.drawable.button_no_back);
                        holder.startTask.setText("完成");
                    }
                };
                timer.start();
            }

            @Override
            public void onDeleteBtnClick(View view, RecycleAdapter.MyViewHolder holder, int position) {
                Toast.makeText(MainActivity.this, "onDeleteBtnClick", Toast.LENGTH_SHORT).show();

            }
        });
        /**
         * 经典 风格的头部实现
         */
        final PtrClassicDefaultHeader header = new PtrClassicDefaultHeader(this);
        header.setPadding(0, PtrLocalDisplay.dp2px(15), 0, 0);

        PtrClassicDefaultFooter footer = new PtrClassicDefaultFooter(this);
        footer.setPadding(0, 0, 0, PtrLocalDisplay.dp2px(15));

        ptrClassicLayout.setHeaderView(header);
        ptrClassicLayout.addPtrUIHandler(header);

        ptrClassicLayout.setFooterView(footer);
        ptrClassicLayout.addPtrUIHandler(footer);
        //mPtrFrame.setKeepHeaderWhenRefresh(true);//刷新时保持头部的显示，默认为true
        //mPtrFrame.disableWhenHorizontalMove(true);//如果是ViewPager，设置为true，会解决ViewPager滑动冲突问题。
        ptrClassicLayout.setPtrHandler(new PtrHandler2() {
            @Override
            public boolean checkCanDoLoadMore(PtrFrameLayout frame, View content, View footer) {
                // 默认实现，根据实际情况做改动
                return PtrDefaultHandler2.checkContentCanBePulledUp(frame, content, footer);
            }

            /**
             * 加载更多的回调
             * @param frame
             */
            @Override
            public void onLoadMoreBegin(PtrFrameLayout frame) {
                frame.postDelayed(new Runnable() {
                    @Override
                    public void run() {

                        ptrClassicLayout.refreshComplete();
                    }
                }, 2000);
            }

            @Override
            public boolean checkCanDoRefresh(PtrFrameLayout frame, View content, View header) {
                // 默认实现，根据实际情况做改动
                return PtrDefaultHandler2.checkContentCanBePulledDown(frame, content, header);
            }

            /**
             * 下拉刷新的回调
             * @param frame
             */
            @Override
            public void onRefreshBegin(PtrFrameLayout frame) {
                frame.postDelayed(new Runnable() {
                    @Override
                    public void run() {

                        ptrClassicLayout.refreshComplete();
                    }
                }, 1000);
            }
        });

    }
}

这些都是我真实项目的demo，里面不止上拉刷新、下拉加载的功能，在以前功能基础上添加到，把这分享出来和大家交流，希望可以更好的进步。
最后贴上源码地址：https://github.com/hellodonj/PtrClassicDemo.git

总结：
学习需要坚持。不要怂，就是干。