Android listview+SwipeRefreshLayout 下拉刷新，上拉加载．

Android常用三方框架Android常用三方框架
首先：自定义SwipeRefreshLayout　可直接拿来使用．


import android.content.Context;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.AbsListView;
import android.widget.ListView;

/**
 * 继承自SwipeRefreshLayout,从而实现滑动到底部时上拉加载更多的功能.
 *
 */
public class RefreshLayout extends SwipeRefreshLayout implements AbsListView.OnScrollListener {

    /**
 * 滑动到最下面时的上拉操作
 */

    private int mTouchSlop;
    /**
 * listview实例
 */
    private ListView mListView;

    /**
 * 上拉监听器, 到了最底部的上拉加载操作
 */
    private OnLoadListener mOnLoadListener;

    /**
 * ListView的加载中footer
 */
    private View mListViewFooter;

    /**
 * 按下时的y坐标
 */
    private int mYDown;
    /**
 * 抬起时的y坐标, 与mYDown一起用于滑动到底部时判断是上拉还是下拉
 */
    private int mLastY;
    /**
 * 是否在加载中 ( 上拉加载更多 )
 */
    private boolean isLoading = false;

    /**
 * @param context
 */
    public RefreshLayout(Context context) {
        this(context, null);
    }

    public RefreshLayout(Context context, AttributeSet attrs) {
        super(context, attrs);

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();

        mListViewFooter = LayoutInflater.from(context).inflate(R.layout.listview_footer, null,
                false);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);

        // 初始化ListView对象
        if (mListView == null) {
            getListView();
        }
    }

    /**
 * 获取ListView对象
 */
    private void getListView() {
        int childs = getChildCount();
        if (childs > 0) {
            View childView = getChildAt(0);
            if (childView instanceof ListView) {
                mListView = (ListView) childView;
                // 设置滚动监听器给ListView, 使得滚动的情况下也可以自动加载
                mListView.setOnScrollListener(this);
                Log.d(VIEW_LOG_TAG, "### 找到listview");
            }
        }
    }
    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        final int action = event.getAction();

        switch (action) {
            case MotionEvent.ACTION_DOWN:
                // 按下
                mYDown = (int) event.getRawY();
                break;

            case MotionEvent.ACTION_MOVE:
                // 移动
                mLastY = (int) event.getRawY();
                break;

            case MotionEvent.ACTION_UP:
                // 抬起
                if (canLoad()) {
                    loadData();
                }
                break;
            default:
                break;
        }

        return super.dispatchTouchEvent(event);
    }

    /**
 * 是否可以加载更多, 条件是到了最底部, listview不在加载中, 且为上拉操作.
 *
 * @return
 */
    private boolean canLoad() {
        return isBottom() && !isLoading && isPullUp();
    }

    /**
 * 判断是否到了最底部
 */
    private boolean isBottom() {

        if (mListView != null && mListView.getAdapter() != null) {
            return mListView.getLastVisiblePosition() == (mListView.getAdapter().getCount() - 1);
        }
        return false;
    }

    /**
 * 是否是上拉操作
 *
 * @return
 */
    private boolean isPullUp() {
        return (mYDown - mLastY) >= mTouchSlop;
    }

    /**
 * 如果到了最底部,而且是上拉操作.那么执行onLoad方法
 */
    private void loadData() {
        if (mOnLoadListener != null) {
            // 设置状态
            setLoading(true);
            //
            mOnLoadListener.onLoad();
        }
    }

    /**
 * @param loading
 */
    public void setLoading(boolean loading) {
        isLoading = loading;
        if (isLoading) {
            mListView.addFooterView(mListViewFooter);
        } else {
            mListView.removeFooterView(mListViewFooter);
            mYDown = 0;
            mLastY = 0;
        }
    }

    /**
 * @param loadListener
 */
    public void setOnLoadListener(OnLoadListener loadListener) {
        mOnLoadListener = loadListener;
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {

    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
                         int totalItemCount) {
        // 滚动时到了最底部也可以加载更多
        if (canLoad()) {
            loadData();
        }
    }

    /**
 * 加载更多的监听器
 *
 * @author mrsimple
 */
    public static interface OnLoadListener {
        public void onLoad();
    }
}

布局activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.example.myapplication.MainActivity">

    <com.example.myapplication.RefreshLayout
 android:id="@+id/swipe_layout"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
        <ListView
 android:id="@+id/listview"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:footerDividersEnabled="false"
 >
        </ListView>
    </com.example.myapplication.RefreshLayout>
</RelativeLayout>

item_base.xml，需要显示的内容

<?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:id="@+id/tv_title"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="@android:color/white"
 android:text="视线好转"/>
</LinearLayout>

listview_footer.xml．底部加载控件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:gravity="center"
 android:paddingBottom="8dip"
 android:paddingTop="5dip" >

    <ProgressBar
 android:id="@+id/pull_to_refresh_load_progress"
 style="@style/Widget.AppCompat.ProgressBar"
 android:layout_width="wrap_content"
 android:layout_height="20dp"
 android:layout_centerVertical="true"
 android:layout_centerHorizontal="true"
 android:paddingRight="100dp"
 android:indeterminate="true" />

    <TextView
 android:id="@+id/pull_to_refresh_loadmore_text"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_gravity="center"
 android:gravity="center"
 android:paddingTop="5dip"
 android:text="加载"
 android:textSize="14sp"
 />

</RelativeLayout>

MainActivity中：

 // 获取RefreshLayout实例
        myRefreshListView = (RefreshLayout)
                findViewById(R.id.swipe_layout);

        // 设置下拉刷新时的颜色值,颜色值需要定义在xml中　颜色根据时间长度变换
        myRefreshListView
                .setColorSchemeResources(R.color.colorPrimary,
                        R.color.colorPrimary, R.color.colorAccent,
                        R.color.colorPrimaryDark);
        //首次进入是自动刷新动作
        myRefreshListView.setRefreshing(true);
        //首次进入下拉动作刷新的时间
        myRefreshListView.postDelayed(new Runnable() {
            @Override
            public void run() {
                postAsynHttp();
                myRefreshListView.setRefreshing(false);
            }
        },5000);
        // 设置下拉刷新监听器
        myRefreshListView.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {

            @Override
            public void onRefresh() {

                Toast.makeText(MainActivity.this, "刷新", Toast.LENGTH_SHORT).show();

                myRefreshListView.postDelayed(new Runnable() {

                    @Override
                    public void run() {
                        // 更新数据
                        postAsynHttp();//网络请求
                        listAdapter.notifyDataSetChanged();
                        // 更` 新完后调用该方法结束刷新
                        myRefreshListView.setRefreshing(false);
                    }
                }, 1000);
            }
        });

        // 加载监听器
        myRefreshListView.setOnLoadListener(new RefreshLayout.OnLoadListener() {

            @Override
            public void onLoad() {

                Toast.makeText(MainActivity.this, "加载", Toast.LENGTH_SHORT).show();

                myRefreshListView.postDelayed(new Runnable() {

                    @Override
                    public void run() {
                        postAsynHttp();

                        // 加载完后调用该方法
                        myRefreshListView.setLoading(false);
                        listAdapter.notifyDataSetChanged();
                    }
                }, 1500);

            }
        });

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