SwipeRefreshLayout 下拉刷新控件（二）

前面一篇文章中，我们已经学会了使用SwipeRefreshLayout 控件，但致命的缺点是只能进行下拉刷新，不能进行上拉加载，那我们在这里来进行扩展一下，让它具有上拉加载的功能。
首先，我们还是先来看看效果，这里会出现两种：
第一种：

第二种：

下面来看一下代码部分：
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import android.annotation.SuppressLint;
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.AbsListView.OnScrollListener;
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.
*
* @author caijin
*/
public class RefreshLayout extends SwipeRefreshLayout implements
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);}@SuppressLint("InflateParams")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);}@Overrideprotected 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");        }    }}/* * (non-Javadoc) *  * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent) */@Overridepublic 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;}@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {}@Overridepublic 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();    }}/** * 设置刷新 */public static void setRefreshing(SwipeRefreshLayout refreshLayout,        boolean refreshing, boolean notify) {    Class<? extends SwipeRefreshLayout> refreshLayoutClass = refreshLayout            .getClass();    if (refreshLayoutClass != null) {        try {            Method setRefreshing = refreshLayoutClass.getDeclaredMethod(                    "setRefreshing", boolean.class, boolean.class);            setRefreshing.setAccessible(true);            setRefreshing.invoke(refreshLayout, refreshing, notify);        } catch (NoSuchMethodException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        } catch (InvocationTargetException e) {            e.printStackTrace();        }    }}/** * 加载更多的监听器 *  * @author caijin */public static interface OnLoadListener {    public void onLoad();}

}

然后是适配器部分：
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public class MyAdapter extends BaseAdapter {
public ArrayList< HashMap< String, String>> list;
public Context context;
public LayoutInflater layoutInflater;

public MyAdapter(Context context, ArrayList<HashMap<String, String>> list) {    this.context = context;    this.list = list;    layoutInflater = LayoutInflater.from(context);}@Overridepublic int getCount() {    return list.size();}@Overridepublic Object getItem(int position) {    return null;}@Overridepublic long getItemId(int position) {    return 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {    View view = null;    ViewHolder holder = null;    if (convertView == null) {        view = layoutInflater.inflate(R.layout.item, null);        holder = new ViewHolder();        view.setTag(holder);    } else {        view = convertView;        holder = (ViewHolder) view.getTag();    }    return view;}static class ViewHolder {}

}

最后是在Activity中的使用：
import java.util.ArrayList;
import java.util.HashMap;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.view.View;
import android.widget.ListView;
import com.example.swiperefreshlayoutdemo.RefreshLayout.OnLoadListener;
/**
*
* @author caijin
* @e-mail [e-mail]
*
*/
public class MainActivity extends Activity implements OnRefreshListener,
OnLoadListener {

private RefreshLayout swipeLayout;private ListView listView;private MyAdapter adapter;private ArrayList<HashMap<String, String>> list;private View header;@Overridepublic void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    initView();    setData();    setListener();    /*设置自动刷新 swipeLayout.setRefreshing(true);    setRefreshing(true)是不会触发onRefresh的,必须要手动调用一次    所以在界面onCreate里面想要立刻加载就需要这样*/    swipeLayout.post(new Thread(new Runnable() {        @Override        public void run() {            swipeLayout.setRefreshing(true);        }    }));    onRefresh();}/** * 初始化布局 */@SuppressLint({ "InlinedApi", "InflateParams" })private void initView() {    header = getLayoutInflater().inflate(R.layout.header, null);    swipeLayout = (RefreshLayout) findViewById(R.id.swipe_container);    swipeLayout.setColorSchemeResources(R.color.color_bule2,            R.color.color_bule,            R.color.color_bule2,            R.color.color_bule3);}/** * 添加数据 */private void setData() {    list = new ArrayList<HashMap<String, String>>();    for (int i = 0; i < 10; i++) {        list.add(new HashMap<String, String>());    }    listView = (ListView) findViewById(R.id.list);    listView.addHeaderView(header);    adapter = new MyAdapter(this, list);    listView.setAdapter(adapter);}/** * 设置监听 */private void setListener() {    swipeLayout.setOnRefreshListener(this);    swipeLayout.setOnLoadListener(this);}/** * 上拉刷新 */@Overridepublic void onRefresh() {    swipeLayout.postDelayed(new Runnable() {        @Override        public void run() {            // 更新数据            // 更新完后调用该方法结束刷新            list.clear();            for (int i = 0; i < 10; i++) {                list.add(new HashMap<String, String>());            }            adapter.notifyDataSetChanged();            swipeLayout.setRefreshing(false);        }    }, 2000);}/** * 加载更多 */@Overridepublic void onLoad() {    swipeLayout.postDelayed(new Runnable() {        @Override        public void run() {            // 更新数据            // 更新完后调用该方法结束刷新            swipeLayout.setLoading(false);            for (int i = 0; i < 10; i++) {                list.add(new HashMap<String, String>());            }            adapter.notifyDataSetChanged();        }    }, 2000);}

}
以上就可以实现上拉加载和下拉刷新了。布局文件我就不贴出来了。
下载地址：
http://download.csdn.net/detail/u014727709/9711105
转载自：http://blog.csdn.net/u014727709/article/details/53638337
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