PullToRefresh

本Demo地址：http://download.csdn.net/download/g_ying_jie/10129660

原作者做了一系列的封装实现了通用的下拉刷新和上拉加载更多，讲解的非常详细生动不了解原理的可以点击下面的链接学习。我在其基础上简化出了一个集成的Demo，拷贝几个自定义的View就能实现该功能，完善了禁用刷新和加载的功能,添加了对RecycleView的支持，以适应更多的场景。本篇博文不会再去讲解实现原理

参考文章：http://blog.csdn.net/zhongkejingwang/article/details/38868463

这里以ScrollView作为案例，其他的一样。

package com.dcg.pulltorefresh.view;import android.content.Context;import android.util.AttributeSet;import android.widget.ScrollView;public class PullableScrollView extends ScrollView implements Pullable {    //是否允许上拉加载    private boolean canPullUp = true;    //是否允许下拉刷新    private boolean canPullDown = true;    public PullableScrollView(Context context) {        super(context);    }    public PullableScrollView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public PullableScrollView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    @Override    public boolean canPullDown() {        if (getScrollY() == 0)            return canPullDown;        else            return false;    }    @Override    public boolean canPullUp() {        if (getScrollY() >= (getChildAt(0).getHeight() - getMeasuredHeight()))            return canPullUp;        else            return false;    }    public void setCanPullUp(boolean canPullUp) {        this.canPullUp = canPullUp;    }    public void setCanPullDown(boolean canPullDown) {        this.canPullDown = canPullDown;    }}

该View继承ScrollView，通过Pullable接口通知父布局PullToRefreshLayout实现下拉刷新、上拉加载的功能。

这里添加了两个对外的方法控制canPullDown和canPullUp实现对应功能的禁用

@另外一个需要注意的地方PullToRefreshLayout

package com.dcg.explore.view;import android.content.Context;import android.os.AsyncTask;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.animation.AnimationUtils;import android.view.animation.LinearInterpolator;import android.view.animation.RotateAnimation;import android.widget.RelativeLayout;import android.widget.TextView;import com.dcg.explore.R;import java.util.Timer;import java.util.TimerTask;/** * 自定义的布局，用来管理三个子控件 * 一个是下拉头 * 一个是包含内容的pullableView（可以是实现Pullable接口的的任何View） * 一个上拉头 */public class PullToRefreshLayout extends RelativeLayout {    public static final String TAG = "PullToRefreshLayout";    // 初始状态    public static final int INIT = 0;    // 释放刷新    public static final int RELEASE_TO_REFRESH = 1;    // 正在刷新    public static final int REFRESHING = 2;    // 释放加载    public static final int RELEASE_TO_LOAD = 3;    // 正在加载    public static final int LOADING = 4;    // 操作完毕    public static final int DONE = 5;    // 当前状态    private int state = INIT;    // 刷新回调接口    private OnRefreshListener mListener;    // 刷新成功    public static final int SUCCEED = 0;    // 刷新失败    public static final int FAIL = 1;    // 按下Y坐标，上一个事件点Y坐标    private float downY, lastY;    // 下拉的距离。注意：pullDownY和pullUpY不可能同时不为0    public float pullDownY = 0;    // 上拉的距离    private float pullUpY = 0;    // 释放刷新的距离    private float refreshDist = 200;    // 释放加载的距离    private float loadmoreDist = 200;    private MyTimer timer;    // 回滚速度    public float MOVE_SPEED = 8;    // 第一次执行布局    private boolean isLayout = false;    // 在刷新过程中滑动操作    private boolean isTouch = false;    // 手指滑动距离与下拉头的滑动距离比，中间会随正切函数变化    private float radio = 2;    // 下拉箭头的转180°动画    private RotateAnimation rotateAnimation;    // 均匀旋转动画    private RotateAnimation refreshingAnimation;    // 下拉头    private View refreshView;    // 下拉的箭头    private View pullView;    // 正在刷新的图标    private View refreshingView;    // 刷新结果图标    private View refreshStateImageView;    // 刷新结果：成功或失败    private TextView refreshStateTextView;    // 上拉头    private View loadmoreView;    // 上拉的箭头    private View pullUpView;    // 正在加载的图标    private View loadingView;    // 加载结果图标    private View loadStateImageView;    // 加载结果：成功或失败    private TextView loadStateTextView;    // 实现了Pullable接口的View    private View pullableView;    // 过滤多点触碰    private int mEvents;    // 这两个变量用来控制pull的方向，如果不加控制，当情况满足可上拉又可下拉时没法下拉    private boolean canPullDown = true;    private boolean canPullUp = true;    private Context mContext;    /**     * 执行自动回滚的handler     */    Handler updateHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            // 回弹速度随下拉距离moveDeltaY增大而增大            MOVE_SPEED = (float) (8 + 5 * Math.tan(Math.PI / 2                    / getMeasuredHeight() * (pullDownY + Math.abs(pullUpY))));            if (!isTouch) {                // 正在刷新，且没有往上推的话则悬停，显示"正在刷新..."                if (state == REFRESHING && pullDownY <= refreshDist) {                    pullDownY = refreshDist;                    timer.cancel();                } else if (state == LOADING && -pullUpY <= loadmoreDist) {                    pullUpY = -loadmoreDist;                    timer.cancel();                }            }            if (pullDownY > 0)                pullDownY -= MOVE_SPEED;            else if (pullUpY < 0)                pullUpY += MOVE_SPEED;            if (pullDownY < 0) {                // 已完成回弹                pullDownY = 0;                pullView.clearAnimation();                // 隐藏下拉头时有可能还在刷新，只有当前状态不是正在刷新时才改变状态                if (state != REFRESHING && state != LOADING)                    changeState(INIT);                timer.cancel();                requestLayout();            }            if (pullUpY > 0) {                // 已完成回弹                pullUpY = 0;                pullUpView.clearAnimation();                // 隐藏上拉头时有可能还在刷新，只有当前状态不是正在刷新时才改变状态                if (state != REFRESHING && state != LOADING)                    changeState(INIT);                timer.cancel();                requestLayout();            }            Log.d("handle", "handle");            // 刷新布局,会自动调用onLayout            requestLayout();            // 没有拖拉或者回弹完成            if (pullDownY + Math.abs(pullUpY) == 0)                timer.cancel();        }    };    public void setOnRefreshListener(OnRefreshListener listener) {        mListener = listener;    }    public PullToRefreshLayout(Context context) {        super(context);        initView(context);    }    public PullToRefreshLayout(Context context, AttributeSet attrs) {        super(context, attrs);        initView(context);    }    public PullToRefreshLayout(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        initView(context);    }    private void initView(Context context) {        mContext = context;        timer = new MyTimer(updateHandler);        rotateAnimation = (RotateAnimation) AnimationUtils.loadAnimation(                context, R.anim.reverse_anim);        refreshingAnimation = (RotateAnimation) AnimationUtils.loadAnimation(                context, R.anim.rotating);        // 添加匀速转动动画        LinearInterpolator lir = new LinearInterpolator();        rotateAnimation.setInterpolator(lir);        refreshingAnimation.setInterpolator(lir);    }    private void hide() {        timer.schedule(5);    }    /**     * 完成刷新操作，显示刷新结果。注意：刷新完成后一定要调用这个方法     */    /**     * @param refreshResult PullToRefreshLayout.SUCCEED代表成功，PullToRefreshLayout.FAIL代表失败     */    public void refreshFinish(int refreshResult) {        refreshingView.clearAnimation();        refreshingView.setVisibility(View.GONE);        switch (refreshResult) {            case SUCCEED:                // 刷新成功                refreshStateImageView.setVisibility(View.VISIBLE);                refreshStateTextView.setText("刷新成功");                refreshStateImageView                        .setBackgroundResource(R.mipmap.refresh_succeed);                break;            case FAIL:            default:                // 刷新失败                refreshStateImageView.setVisibility(View.VISIBLE);                refreshStateTextView.setText("刷新失败");                refreshStateImageView                        .setBackgroundResource(R.mipmap.refresh_failed);                break;        }        if (pullDownY > 0) {            // 刷新结果停留1秒            new Handler() {                @Override                public void handleMessage(Message msg) {                    changeState(DONE);                    hide();                }            }.sendEmptyMessageDelayed(0, 1000);        } else {            changeState(DONE);            hide();        }    }    /**     * 加载完毕，显示加载结果。注意：加载完成后一定要调用这个方法     *     * @param refreshResult PullToRefreshLayout.SUCCEED代表成功，PullToRefreshLayout.FAIL代表失败     */    public void loadmoreFinish(int refreshResult) {        loadingView.clearAnimation();        loadingView.setVisibility(View.GONE);        switch (refreshResult) {            case SUCCEED:                // 加载成功                loadStateImageView.setVisibility(View.VISIBLE);                loadStateTextView.setText("加载成功");                loadStateImageView.setBackgroundResource(R.mipmap.load_succeed);                break;            case FAIL:            default:                // 加载失败                loadStateImageView.setVisibility(View.VISIBLE);                loadStateTextView.setText("加载失败");                loadStateImageView.setBackgroundResource(R.mipmap.load_failed);                break;        }        if (pullUpY < 0) {            // 刷新结果停留1秒            new Handler() {                @Override                public void handleMessage(Message msg) {                    changeState(DONE);                    hide();                }            }.sendEmptyMessageDelayed(0, 1000);        } else {            changeState(DONE);            hide();        }    }    private void changeState(int to) {        state = to;        switch (state) {            case INIT:                // 下拉布局初始状态                refreshStateImageView.setVisibility(View.GONE);                refreshStateTextView.setText("下拉刷新");                pullView.clearAnimation();                pullView.setVisibility(View.VISIBLE);                // 上拉布局初始状态                loadStateImageView.setVisibility(View.GONE);                loadStateTextView.setText("上拉加载更多");                pullUpView.clearAnimation();                pullUpView.setVisibility(View.VISIBLE);                break;            case RELEASE_TO_REFRESH:                // 释放刷新状态                refreshStateTextView.setText("释放立即刷新");                pullView.startAnimation(rotateAnimation);                break;            case REFRESHING:                // 正在刷新状态                pullView.clearAnimation();                refreshingView.setVisibility(View.VISIBLE);                pullView.setVisibility(View.INVISIBLE);                refreshingView.startAnimation(refreshingAnimation);                refreshStateTextView.setText("正在刷新");                break;            case RELEASE_TO_LOAD:                // 释放加载状态                loadStateTextView.setText("释放立即加载");                pullUpView.startAnimation(rotateAnimation);                break;            case LOADING:                // 正在加载状态                pullUpView.clearAnimation();                loadingView.setVisibility(View.VISIBLE);                pullUpView.setVisibility(View.INVISIBLE);                loadingView.startAnimation(refreshingAnimation);                loadStateTextView.setText("正在加载");                break;            case DONE:                // 刷新或加载完毕，啥都不做                break;        }    }    /**     * 不限制上拉或下拉     */    private void releasePull() {        canPullDown = true;        canPullUp = true;    }    /*     * （非 Javadoc）由父控件决定是否分发事件，防止事件冲突     *     * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)     */    @Override    public boolean dispatchTouchEvent(MotionEvent ev) {        switch (ev.getActionMasked()) {            case MotionEvent.ACTION_DOWN:                downY = ev.getY();                lastY = downY;                timer.cancel();                mEvents = 0;                releasePull();                break;            case MotionEvent.ACTION_POINTER_DOWN:            case MotionEvent.ACTION_POINTER_UP:                // 过滤多点触碰                mEvents = -1;                break;            case MotionEvent.ACTION_MOVE:                if (mEvents == 0) {                    if (pullDownY > 0                            || (((Pullable) pullableView).canPullDown()                            && canPullDown && state != LOADING)) {                        // 可以下拉，正在加载时不能下拉                        // 对实际滑动距离做缩小，造成用力拉的感觉                        pullDownY = pullDownY + (ev.getY() - lastY) / radio;                        if (pullDownY < 0) {                            pullDownY = 0;                            canPullDown = false;                            canPullUp = true;                        }                        if (pullDownY > getMeasuredHeight())                            pullDownY = getMeasuredHeight();                        if (state == REFRESHING) {                            // 正在刷新的时候触摸移动                            isTouch = true;                        }                    } else if (pullUpY < 0                            || (((Pullable) pullableView).canPullUp() && canPullUp && state != REFRESHING)) {                        // 可以上拉，正在刷新时不能上拉                        pullUpY = pullUpY + (ev.getY() - lastY) / radio;                        if (pullUpY > 0) {                            pullUpY = 0;                            canPullDown = true;                            canPullUp = false;                        }                        if (pullUpY < -getMeasuredHeight())                            pullUpY = -getMeasuredHeight();                        if (state == LOADING) {                            // 正在加载的时候触摸移动                            isTouch = true;                        }                    } else                        releasePull();                } else                    mEvents = 0;                lastY = ev.getY();                // 根据下拉距离改变比例                radio = (float) (2 + 2 * Math.tan(Math.PI / 2 / getMeasuredHeight()                        * (pullDownY + Math.abs(pullUpY))));                if (pullDownY > 0 || pullUpY < 0)                    requestLayout();                if (pullDownY > 0) {                    if (pullDownY <= refreshDist                            && (state == RELEASE_TO_REFRESH || state == DONE)) {                        // 如果下拉距离没达到刷新的距离且当前状态是释放刷新，改变状态为下拉刷新                        changeState(INIT);                    }                    if (pullDownY >= refreshDist && state == INIT) {                        // 如果下拉距离达到刷新的距离且当前状态是初始状态刷新，改变状态为释放刷新                        changeState(RELEASE_TO_REFRESH);                    }                } else if (pullUpY < 0) {                    // 下面是判断上拉加载的，同上，注意pullUpY是负值                    if (-pullUpY <= loadmoreDist                            && (state == RELEASE_TO_LOAD || state == DONE)) {                        changeState(INIT);                    }                    // 上拉操作                    if (-pullUpY >= loadmoreDist && state == INIT) {                        changeState(RELEASE_TO_LOAD);                    }                }                // 因为刷新和加载操作不能同时进行，所以pullDownY和pullUpY不会同时不为0，因此这里用(pullDownY +                // Math.abs(pullUpY))就可以不对当前状态作区分了                if ((pullDownY + Math.abs(pullUpY)) > 8) {                    // 防止下拉过程中误触发长按事件和点击事件                    ev.setAction(MotionEvent.ACTION_CANCEL);                }                break;            case MotionEvent.ACTION_UP:                if (pullDownY > refreshDist || -pullUpY > loadmoreDist)                // 正在刷新时往下拉（正在加载时往上拉），释放后下拉头（上拉头）不隐藏                {                    isTouch = false;                }                if (state == RELEASE_TO_REFRESH) {                    changeState(REFRESHING);                    // 刷新操作                    if (mListener != null)                        mListener.onRefresh(this);                } else if (state == RELEASE_TO_LOAD) {                    changeState(LOADING);                    // 加载操作                    if (mListener != null)                        mListener.onLoadMore(this);                }                hide();            default:                break;        }        // 事件分发交给父类        super.dispatchTouchEvent(ev);        return true;    }    /**     * @author chenjing 自动模拟手指滑动的task     */    private class AutoRefreshAndLoadTask extends            AsyncTask<Integer, Float, String> {        @Override        protected String doInBackground(Integer... params) {            while (pullDownY < 4 / 3 * refreshDist) {                pullDownY += MOVE_SPEED;                publishProgress(pullDownY);                try {                    Thread.sleep(params[0]);                } catch (InterruptedException e) {                    e.printStackTrace();                }            }            return null;        }        @Override        protected void onPostExecute(String result) {            changeState(REFRESHING);            // 刷新操作            if (mListener != null)                mListener.onRefresh(PullToRefreshLayout.this);            hide();        }        @Override        protected void onProgressUpdate(Float... values) {            if (pullDownY > refreshDist)                changeState(RELEASE_TO_REFRESH);            requestLayout();        }    }    /**     * 自动刷新     */    public void autoRefresh() {        AutoRefreshAndLoadTask task = new AutoRefreshAndLoadTask();        task.execute(20);    }    /**     * 自动加载     */    public void autoLoad() {        pullUpY = -loadmoreDist;        requestLayout();        changeState(LOADING);        // 加载操作        if (mListener != null)            mListener.onLoadMore(this);    }    private void initView() {        // 初始化下拉布局        pullView = refreshView.findViewById(R.id.pull_icon);        refreshStateTextView = (TextView) refreshView                .findViewById(R.id.state_tv);        refreshingView = refreshView.findViewById(R.id.refreshing_icon);        refreshStateImageView = refreshView.findViewById(R.id.state_iv);        // 初始化上拉布局        pullUpView = loadmoreView.findViewById(R.id.pullup_icon);        loadStateTextView = (TextView) loadmoreView                .findViewById(R.id.loadstate_tv);        loadingView = loadmoreView.findViewById(R.id.loading_icon);        loadStateImageView = loadmoreView.findViewById(R.id.loadstate_iv);    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        Log.d("Test", "Test");        if (!isLayout) {            // 这里是第一次进来的时候做一些初始化            refreshView = getChildAt(0);            pullableView = getChildAt(1);            loadmoreView = getChildAt(2);            isLayout = true;            initView();            refreshDist = ((ViewGroup) refreshView).getChildAt(0)                    .getMeasuredHeight();            loadmoreDist = ((ViewGroup) loadmoreView).getChildAt(0)                    .getMeasuredHeight();        }        // 改变子控件的布局，这里直接用(pullDownY + pullUpY)作为偏移量，这样就可以不对当前状态作区分        refreshView.layout(0,                (int) (pullDownY + pullUpY) - refreshView.getMeasuredHeight(),                refreshView.getMeasuredWidth(), (int) (pullDownY + pullUpY));        pullableView.layout(0, (int) (pullDownY + pullUpY),                pullableView.getMeasuredWidth(), (int) (pullDownY + pullUpY)                        + pullableView.getMeasuredHeight());        loadmoreView.layout(0,                (int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight(),                loadmoreView.getMeasuredWidth(),                (int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight()                        + loadmoreView.getMeasuredHeight());    }    class MyTimer {        private Handler handler;        private Timer timer;        private MyTask mTask;        public MyTimer(Handler handler) {            this.handler = handler;            timer = new Timer();        }        public void schedule(long period) {            if (mTask != null) {                mTask.cancel();                mTask = null;            }            mTask = new MyTask(handler);            timer.schedule(mTask, 0, period);        }        public void cancel() {            if (mTask != null) {                mTask.cancel();                mTask = null;            }        }        class MyTask extends TimerTask {            private Handler handler;            public MyTask(Handler handler) {                this.handler = handler;            }            @Override            public void run() {                handler.obtainMessage().sendToTarget();            }        }    }    /**     * 刷新加载回调接口     *     * @author chenjing     */    public interface OnRefreshListener {        /**         * 刷新操作         */        void onRefresh(PullToRefreshLayout pullToRefreshLayout);        /**         * 加载操作         */        void onLoadMore(PullToRefreshLayout pullToRefreshLayout);    }}

PullToRefresh的子布局只能是三个：下拉展示的头布局；ScrollView（或者其他实现了Pullable接口的View）内容布局通知父布局刷新、加载；上拉展示的脚布局。

所以你现在这些之外展示titlebar之类的布局，可以在PullToRefresh外层再放一层布局，如下

<?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">    <RelativeLayout        android:id="@+id/rl_title"        android:layout_width="match_parent"        android:layout_height="50dp"        android:background="@color/colorPrimary">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:text="我来组成标题"            android:textSize="18sp" />    </RelativeLayout>    <com.dcg.pulltorefresh.view.PullToRefreshLayout        android:id="@+id/refresh_view"        android:layout_width="match_parent"        android:layout_height="match_parent">        <include layout="@layout/refresh_head" />        <!-- 支持所有实现Pullable接口的View -->        <com.dcg.pulltorefresh.view.PullableScrollView            android:id="@+id/pull_scroll_view"            android:layout_width="match_parent"            android:layout_height="match_parent">            <LinearLayout                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:orientation="vertical">                <TextView                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_gravity="center_horizontal"                    android:layout_marginTop="30dp"                    android:text="开放平台"                    android:textSize="16sp" />                <LinearLayout                    android:layout_width="match_parent"                    android:layout_height="wrap_content"                    android:layout_marginBottom="18dp"                    android:layout_marginTop="36dp"                    android:orientation="horizontal">                    <LinearLayout                        android:layout_width="0dp"                        android:layout_height="wrap_content"                        android:layout_gravity="center_vertical"                        android:layout_weight="1"                        android:gravity="center_horizontal"                        android:orientation="vertical">                        <ImageView                            android:id="@+id/img_publish_exponent"                            android:layout_width="60dp"                            android:layout_height="60dp"                            android:scaleType="center"                            android:src="@mipmap/ic_launcher" />                        <TextView                            android:layout_width="wrap_content"                            android:layout_height="wrap_content"                            android:text="出版指数"                            android:textSize="14sp" />                    </LinearLayout>                    <LinearLayout                        android:layout_width="0dp"                        android:layout_height="wrap_content"                        android:layout_gravity="center_vertical"                        android:layout_weight="1"                        android:gravity="center_horizontal"                        android:orientation="vertical">                        <ImageView                            android:id="@+id/img_hot_application"                            android:layout_width="60dp"                            android:layout_height="60dp"                            android:scaleType="center"                            android:src="@mipmap/ic_launcher" />                        <TextView                            android:layout_width="wrap_content"                            android:layout_height="wrap_content"                            android:text="热门应用"                            android:textSize="14sp" />                    </LinearLayout>                    <LinearLayout                        android:layout_width="0dp"                        android:layout_height="wrap_content"                        android:layout_gravity="center_vertical"                        android:layout_weight="1"                        android:gravity="center_horizontal"                        android:orientation="vertical">                        <ImageView                            android:id="@+id/img_preference_works"                            android:layout_width="60dp"                            android:layout_height="60dp"                            android:scaleType="center"                            android:src="@mipmap/ic_launcher" />                        <TextView                            android:layout_width="wrap_content"                            android:layout_height="wrap_content"                            android:text="优选作品"                            android:textSize="14sp" />                    </LinearLayout>                    <LinearLayout                        android:layout_width="0dp"                        android:layout_height="wrap_content"                        android:layout_gravity="center_vertical"                        android:layout_weight="1"                        android:gravity="center_horizontal"                        android:orientation="vertical">                        <ImageView                            android:id="@+id/img_open_resource"                            android:layout_width="60dp"                            android:layout_height="60dp"                            android:scaleType="center"                            android:src="@mipmap/ic_launcher" />                        <TextView                            android:layout_width="wrap_content"                            android:layout_height="wrap_content"                            android:text="开放资源"                            android:textSize="14sp" />                    </LinearLayout>                </LinearLayout>                <View                    android:layout_width="match_parent"                    android:layout_height="12dp"                    android:background="@android:color/darker_gray" />                <TextView                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_gravity="center_horizontal"                    android:layout_marginBottom="10dp"                    android:layout_marginTop="18dp"                    android:text="热点资讯"                    android:textSize="16sp" />                <com.dcg.pulltorefresh.view.NoScrollListView                    android:id="@+id/lv_open_platform"                    android:layout_width="match_parent"                    android:layout_height="match_parent"                    android:layout_marginLeft="10dp"                    android:layout_marginRight="10dp"                    android:dividerHeight="1dp" />            </LinearLayout>        </com.dcg.pulltorefresh.view.PullableScrollView>        <include layout="@layout/load_more" />    </com.dcg.pulltorefresh.view.PullToRefreshLayout></LinearLayout>

@最后，怎么去使用禁用下拉刷新或者上拉加载

package com.dcg.pulltorefresh;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import com.dcg.pulltorefresh.view.PullToRefreshLayout;import com.dcg.pulltorefresh.view.PullableScrollView;public class MainActivity extends AppCompatActivity implements PullToRefreshLayout.OnRefreshListener {    private PullableScrollView scrollView;    private int currentPage = 1;    private int totalPage = 5;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ((PullToRefreshLayout) findViewById(R.id.refresh_view)).setOnRefreshListener(this);        scrollView = (PullableScrollView) findViewById(R.id.pull_scroll_view);        //禁用下拉刷新        //scrollView.setCanPullDown(false);        //禁用上拉加载        //scrollView.setCanPullUp(false);    }    @Override    public void onRefresh(final PullToRefreshLayout pullToRefreshLayout) {        // 下拉刷新操作        new Handler() {            @Override            public void handleMessage(Message msg) {                // 千万别忘了告诉控件刷新完毕！                pullToRefreshLayout.refreshFinish(PullToRefreshLayout.SUCCEED);            }        }.sendEmptyMessageDelayed(0, 5000);    }    @Override    public void onLoadMore(final PullToRefreshLayout pullToRefreshLayout) {        currentPage++;        // 加载操作        new Handler() {            @Override            public void handleMessage(Message msg) {                // 千万别忘了告诉控件加载完毕！                pullToRefreshLayout.loadmoreFinish(PullToRefreshLayout.SUCCEED);                //执行分页加载更多操作            }        }.sendEmptyMessageDelayed(0, 5000);        if (currentPage == totalPage) {            scrollView.setCanPullUp(false);        }    }}

@最后放上改造的可实现上拉加载下拉刷新的RecycleView,详细的用法可以参考demo的RecycleViewActivity

package com.dcg.pulltorefresh.view;import android.content.Context;import android.support.annotation.Nullable;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.util.AttributeSet;/** * Created by Gu on 2017/11/22. */public class PullableRecycleView extends RecyclerView implements Pullable {    private boolean canPullUp = true;    private boolean canPullDown = true;    private LinearLayoutManager layoutManager;    public PullableRecycleView(Context context) {        super(context);    }    public PullableRecycleView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);    }    public PullableRecycleView(Context context, @Nullable AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    @Override    public boolean canPullDown() {        if (layoutManager.getItemCount() == 0) {            // 没有item的时候也可以下拉刷新            return canPullDown;        } else if (layoutManager.findFirstVisibleItemPosition() == 0 && getChildAt(0).getTop() >= 0) {            // 滑到ListView的顶部了            return canPullDown;        } else            return false;    }    @Override    public boolean canPullUp() {        if (layoutManager.getItemCount() == 0) {            // 没有item的时候也可以上拉加载            return canPullUp;        } else if (layoutManager.getChildCount() > 0 && layoutManager.findLastVisibleItemPosition() == (layoutManager.getItemCount() - 1)) {            // 滑到底部了            if (getChildAt(layoutManager.findLastVisibleItemPosition() - layoutManager.findFirstVisibleItemPosition()) != null && getChildAt(layoutManager.findLastVisibleItemPosition() - layoutManager.findFirstVisibleItemPosition()).getBottom() <= getMeasuredHeight())                return canPullUp;        }        return false;    }    public void setCanPullUp(boolean canPullUp) {        this.canPullUp = canPullUp;    }    public void setCanPullDown(boolean canPullDown) {        this.canPullDown = canPullDown;    }    public void setPullable(RecyclerView.LayoutManager layoutManager) {        if (layoutManager instanceof LinearLayoutManager)            this.layoutManager = (LinearLayoutManager) layoutManager;    }}

@搞定收工，很多复杂的布局比如ScrollView嵌套GridView、横向的recycleview，listview并要求实现listview的分页加载都可以通过这种方式轻量级的集成实现