XListView上拉加载下拉刷新.doc

activity_main.xml xlistview_header.xml xlistview_footer.xml MainActivitypackage com.example.shuaxin;import java.util.ArrayList;import com.example.adapter.MyAdapter;import com.example.vo.MusicList;import com.example.vo.PersonVo;import com.google.gson.Gson;import com.lidroid.xutils.HttpUtils;import com.lidroid.xutils.exception.HttpException;import com.lidroid.xutils.http.ResponseInfo;import com.lidroid.xutils.http.callback.RequestCallBack;import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;import me.maxwin.view.XListView;import me.maxwin.view.XListView.IXListViewListener;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.Toast;import android.app.Activity;import android.content.Intent;public class MainActivity extends Activity private int pager=1;private boolean flag=true;private HttpUtils httpUtils;private XListView xlv;private ArrayList list=new ArrayList();private MyAdapter adapter;Handler handler=new Handler();Overrideprotected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();public void init()httpUtils=new HttpUtils();xlv=(XListView) findViewById(R.id.xlv);/设置能上拉加载xlv.setPullLoadEnable(true);/设置能下拉刷新xlv.setPullRefreshEnable(true);/数据getData();adapter = new MyAdapter(list, this);xlv.setAdapter(adapter);/设置监听xlv.setXListViewListener(new IXListViewListener() /下拉刷新Overridepublic void onRefresh() / TODO Auto-generated method stubhandler.postDelayed(new Runnable() Overridepublic void run() /刷新就是清空原来的数据，加载新数据list.clear();getData();adapter = new MyAdapter(list, MainActivity.this);xlv.setAdapter(adapter);onLoad();, 2000);/上拉加载Overridepublic void onLoadMore() / TODO Auto-generated method stubhandler.postDelayed(new Runnable() Overridepublic void run() / TODO Auto-generated method stubgetData();adapter.notifyDataSetChanged();onLoad();, 2000););xlv.setOnItemClickListener(new OnItemClickListener() Overridepublic void onItemClick(AdapterView arg0, View arg1, int arg2,long arg3) / TODO Auto-generated method stubIntent in=new Intent(MainActivity.this, DetilActivity.class);in.putExtra(123, list.get(arg2-1).getMc_imageurl();startActivity(in););/加载数据private void getData() String url=6:8080/Music03/SelectMusic?u_id=&page=10&page_size=+pager;httpUtils.send(HttpMethod.GET, url, new RequestCallBack() Overridepublic void onFailure(HttpException arg0, String arg1) / TODO Auto-generated method stubLog.i(TAG, +请求失败);Overridepublic void onSuccess(ResponseInfo arg0) / TODO Auto-generated method stubLog.i(TAG, 服务器返回的数据=+arg0.result);Gson g=new Gson();PersonVo pv=g.fromJson(arg0.result, PersonVo.class);pager+;if(pv.getMusiclist().size()=10)list.addAll(pv.getMusiclist();adapter.notifyDataSetChanged();elseif(flag)list.addAll(pv.getMusiclist();adapter.notifyDataSetChanged();flag=false;elseToast.makeText(MainActivity.this, 没有更多数据了！, Toast.LENGTH_LONG).show(););public void onLoad()xlv.stopLoadMore();xlv.stopRefresh();xlv.setRefreshTime(刚刚);/使用webwei显示图片/wv.loadUrl(img_url);/wv.setWebViewClient(new WebViewClient();XListView/* * file XListView.java * package me.maxwin.view * create Mar 18, 2012 6:28:41 PM * author Maxwin * description An ListView support (a) Pull down to refresh, (b) Pull up to load more. * Implement IXListViewListener, and see stopRefresh() / stopLoadMore(). */package me.maxwin.view;import com.example.shuaxin.R;import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.ViewTreeObserver.OnGlobalLayoutListener;import android.view.animation.DecelerateInterpolator;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.RelativeLayout;import android.widget.Scroller;import android.widget.TextView;public class XListView extends ListView implements OnScrollListener private float mLastY = -1; / save event yprivate Scroller mScroller; / used for scroll backprivate OnScrollListener mScrollListener; / users scroll listener/ the interface to trigger refresh and load more.private IXListViewListener mListViewListener;/ - header viewprivate XListViewHeader mHeaderView;/ header view content, use it to calculate the Headers height. And hide it/ when disable pull refresh.private RelativeLayout mHeaderViewContent;private TextView mHeaderTimeView;private int mHeaderViewHeight; / header views heightprivate boolean mEnablePullRefresh = true;private boolean mPullRefreshing = false; / is refreashing./ - footer viewprivate XListViewFooter mFooterView;private boolean mEnablePullLoad;private boolean mPullLoading;private boolean mIsFooterReady = false;/ total list items, used to detect is at the bottom of listview.private int mTotalItemCount;/ for mScroller, scroll back from header or footer.private int mScrollBack;private final static int SCROLLBACK_HEADER = 0;private final static int SCROLLBACK_FOOTER = 1;private final static int SCROLL_DURATION = 400; / scroll back durationprivate final static int PULL_LOAD_MORE_DELTA = 50; / when pull up = 50px/ at bottom, trigger/ load more.private final static float OFFSET_RADIO = 1.8f; / support iOS like pull/ feature./* * param context */public XListView(Context context) super(context);initWithContext(context);public XListView(Context context, AttributeSet attrs) super(context, attrs);initWithContext(context);public XListView(Context context, AttributeSet attrs, int defStyle) super(context, attrs, defStyle);initWithContext(context);private void initWithContext(Context context) mScroller = new Scroller(context, new DecelerateInterpolator();/ XListView need the scroll event, and it will dispatch the event to/ users listener (as a proxy).super.setOnScrollListener(this);/ init header viewmHeaderView = new XListViewHeader(context);mHeaderViewContent = (RelativeLayout) mHeaderView.findViewById(R.id.xlistview_header_content);mHeaderTimeView = (TextView) mHeaderView.findViewById(R.id.xlistview_header_time);addHeaderView(mHeaderView);/ init footer viewmFooterView = new XListViewFooter(context);/ init header heightmHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() Overridepublic void onGlobalLayout() mHeaderViewHeight = mHeaderViewContent.getHeight();getViewTreeObserver().removeGlobalOnLayoutListener(this););Overridepublic void setAdapter(ListAdapter adapter) / make sure XListViewFooter is the last footer view, and only add once.if (mIsFooterReady = false) mIsFooterReady = true;addFooterView(mFooterView);super.setAdapter(adapter);/* * enable or disable pull down refresh feature. * * param enable */public void setPullRefreshEnable(boolean enable) mEnablePullRefresh = enable;if (!mEnablePullRefresh) / disable, hide the contentmHeaderViewContent.setVisibility(View.INVISIBLE); else mHeaderViewContent.setVisibility(View.VISIBLE);/* * enable or disable pull up load more feature. * * param enable */public void setPullLoadEnable(boolean enable) mEnablePullLoad = enable;if (!mEnablePullLoad) mFooterView.hide();mFooterView.setOnClickListener(null);/make sure pull up dont show a line in bottom when listview with one page setFooterDividersEnabled(false); else mPullLoading = false;mFooterView.show();mFooterView.setState(XListViewFooter.STATE_NORMAL);/make sure pull up dont show a line in bottom when listview with one page setFooterDividersEnabled(true);/ both pull up and click will invoke load more.mFooterView.setOnClickListener(new OnClickListener() Overridepublic void onClick(View v) startLoadMore(););/* * stop refresh, reset header view. */public void stopRefresh() if (mPullRefreshing = true) mPullRefreshing = false;resetHeaderHeight();/* * stop load more, reset footer view. */public void stopLoadMore() if (mPullLoading = true) mPullLoading = false;mFooterView.setState(XListViewFooter.STATE_NORMAL);/* * set last refresh time * * param time */public void setRefreshTime(String time) mHeaderTimeView.setText(time);private void invokeOnScrolling() if (mScrollListener instanceof OnXScrollListener) OnXScrollListener l = (OnXScrollListener) mScrollListener;l.onXScrolling(this);private void updateHeaderHeight(float delta) mHeaderView.setVisiableHeight(int) delta+ mHeaderView.getVisiableHeight();if (mEnablePullRefresh & !mPullRefreshing) / 未处于刷新状态，更新箭头if (mHeaderView.getVisiableHeight() mHeaderViewHeight) mHeaderView.setState(XListViewHeader.STATE_READY); else mHeaderView.setState(XListViewHeader.STATE_NORMAL);setSelection(0); / scroll to top each time/* * reset header views height. */private void resetHeaderHeight() int height = mHeaderView.getVisiableHeight();if (height = 0) / not visible.return;/ refreshing and header isnt shown fully. do nothing.if (mPullRefreshing & height mHeaderViewHeight) finalHeight = mHeaderViewHeight;mScrollBack = SCROLLBACK_HEADER;mScroller.startScroll(0, height, 0, finalHeight - height,SCROLL_DURATION);/ trigger computeScrollinvalidate();private void updateFooterHeight(float delta) int height = mFooterView.getBottomMargin() + (int) delta;if (mEnablePullLoad & !mPullLoading) if (height PULL_LOAD_MORE_DELTA) / height enough to invoke load/ more.mFooterView.setState(XListViewFooter.STATE_READY); else mFooterView.setState(XListViewFooter.STATE_NORMAL);mFooterView.setBottomMargin(height);/setSelection(mTotalItemCount - 1); / scroll to bottomprivate void resetFooterHeight() int bottomMargin = mFooterView.getBottomMargin();if (bottomMargin 0) mScrollBack = SCROLLBACK_FOOTER;mScroller.startScroll(0, bottomMargin, 0, -bottomMargin,SCROLL_DURATION);invalidate();private void startLoadMore() mPullLoading = true;mFooterView.setState(XListViewFooter.STATE_LOADING);if (mListViewListener != null) mListViewListener.onLoadMore();Overridepublic boolean onTouchEvent(MotionEvent ev) if (mLastY = -1) mLastY = ev.getRawY();switch (ev.getAction() case MotionEvent.ACTION_DOWN:mLastY = ev.getRawY();break;case MotionEvent.ACTION_MOVE:final float deltaY = ev.getRawY() - mLastY;mLastY = ev.getRawY();if (getFirstVisiblePosition() = 0& (mHeaderView.getVisiableHeight() 0 | deltaY 0) / the first item is showing, header has shown or pull down.updateHeaderHeight(deltaY / OFFSET_RADIO);invokeOnScrolling(); else if (getLastVisiblePosition() = mTotalItemCount - 1& (mFooterView.getBottomMargin() 0 | deltaY mHeaderViewHeight) mPullRefreshing = true;mHeaderView.setState(XListViewHeader.STATE_REFRESHING);if (mListViewListener != null) mListViewListener.onRefresh();resetHeaderHeight(); else if (getLastVisiblePosition() = mTotalItemCount - 1) / invoke load more.if (mEnablePullLoad & mFooterView.getBottomMargin() PULL_LOAD_MORE_DELTA & !mPullLoading) startLoadMore();resetFooterHeight();break;return super.onTouchEvent(ev);Overridepublic void computeScroll() if (mSputeScrollOffset() if (mScrollBack = SCROLLBACK_HEADER) mHeaderView.setVisiableHeight(mScroller.getCurrY(); else mFooterView.setBottomMargin(mScroller.getCurrY();postInvalidate();invokeOnScrolling();puteScroll();Overridepublic void setOnScrollListener(OnScrollListener l) mScrollListener = l;Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) if (mScrollListener != null) mScrollListener.onScrollStateChanged(view, scrollState);Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) / send to use