企业互联网服务培训资料doc 60页完美优质版.docx
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企业互联网服务培训资料doc60页完美优质版
importandroid.content.Context;
importandroid.util.AttributeSet;
importandroid.view.MotionEvent;
importandroid.view.View;
importandroid.view.ViewTreeObserver.OnGlobalLayoutListener;
importandroid.view.animation.DecelerateInterpolator;
importandroid.widget.AbsListView;
importandroid.widget.AbsListView.OnScrollListener;
importandroid.widget.ListAdapter;
importandroid.widget.ListView;
importandroid.widget.RelativeLayout;
importandroid.widget.Scroller;
importandroid.widget.TextView;
importcom.insthub.ecmobile.R;
importandroid.os.Message;
importandroid.os.Handler;
publicclassXListViewextendsListViewimplementsOnScrollListener{
privatefloatmLastY=-1;//saveeventy
privateScrollermScroller;//usedforscrollback
privateOnScrollListenermScrollListener;//user'sscrolllistener
//theinterfacetotriggerrefreshandloadmore.
privateIXListViewListenermListViewListener;
//--headerview
privateXListViewHeadermHeaderView;
//headerviewcontent,useittocalculatetheHeader'sheight.Andhideit
//whendisablepullrefresh.
privateRelativeLayoutmHeaderViewContent;
privateTextViewmHeaderTimeView;
privateintmHeaderViewHeight;//headerview'sheight
privatebooleanmEnablePullRefresh=true;
privatebooleanmPullRefreshing=false;//isrefreashing.
//--footerview
privateXListViewFootermFooterView;
privatebooleanmEnablePullLoad;
privatebooleanmPullLoading;
privatebooleanmIsFooterReady=false;
//totallistitems,usedtodetectisatthebottomoflistview.
privateintmTotalItemCount;
//formScroller,scrollbackfromheaderorfooter.
privateintmScrollBack;
privatefinalstaticintSCROLLBACK_HEADER=0;
privatefinalstaticintSCROLLBACK_FOOTER=1;
privatefinalstaticintSCROLL_DURATION=400;//scrollbackduration
privatefinalstaticintPULL_LOAD_MORE_DELTA=50;//whenpullup>=50px
//atbottom,trigger
//loadmore.
privatefinalstaticfloatOFFSET_RADIO=1.8f;//supportiOSlikepull
//feature.
privateintid;
/**
*@paramcontext
*/
publicXListView（Contextcontext）{
super（context）;
initWithContext（context）;
}
publicXListView（Contextcontext,AttributeSetattrs）{
super（context,attrs）;
initWithContext（context）;
}
publicXListView（Contextcontext,AttributeSetattrs,intdefStyle）{
super（context,attrs,defStyle）;
initWithContext（context）;
}
privatevoidinitWithContext（Contextcontext）{
mScroller=newScroller（context,newDecelerateInterpolator（））;
//XListViewneedthescrollevent,anditwilldispatchtheeventto
//user'slistener（asaproxy）.
super.setOnScrollListener（this）;
//initheaderview
mHeaderView=newXListViewHeader（context）;
mHeaderViewContent=（RelativeLayout）mHeaderView
.findViewById（R.id.xlistview_header_content）;
mHeaderTimeView=（TextView）mHeaderView
.findViewById（R.id.xlistview_header_time）;
addHeaderView（mHeaderView）;
//initfooterview
mFooterView=newXListViewFooter（context）;
//initheaderheight
mHeaderView.getViewTreeObserver（）.addOnGlobalLayoutListener（
newOnGlobalLayoutListener（）{
@Override
publicvoidonGlobalLayout（）{
mHeaderViewHeight=mHeaderViewContent.getHeight（）;
getViewTreeObserver（）
.removeGlobalOnLayoutListener（this）;
}
}）;
}
@Override
publicvoidsetAdapter（ListAdapteradapter）{
//makesureXListViewFooteristhelastfooterview,andonlyaddonce.
if（mIsFooterReady==false）{
mIsFooterReady=true;
addFooterView（mFooterView）;
}
super.setAdapter（adapter）;
}
/**
*enableordisablepulldownrefreshfeature.
*
*@paramenable
*/
publicvoidsetPullRefreshEnable（booleanenable）{
mEnablePullRefresh=enable;
if（!
mEnablePullRefresh）{//disable,hidethecontent
mHeaderViewContent.setVisibility（View.INVISIBLE）;
}else{
mHeaderViewContent.setVisibility（View.VISIBLE）;
}
}
/**
*enableordisablepulluploadmorefeature.
*
*@paramenable
*/
publicvoidsetPullLoadEnable（booleanenable）{
mEnablePullLoad=enable;
if（!
mEnablePullLoad）{
mFooterView.hide（）;
mFooterView.setOnClickListener（null）;
}else{
mPullLoading=false;
mFooterView.show（）;
mFooterView.setState（XListViewFooter.STATE_NORMAL）;
//both"pullup"and"click"willinvokeloadmore.
mFooterView.setOnClickListener（newOnClickListener（）{
@Override
publicvoidonClick（Viewv）{
startLoadMore（）;
}
}）;
}
}
/**
*stoprefresh,resetheaderview.
*/
publicvoidstopRefresh（）{
if（mPullRefreshing==true）{
mPullRefreshing=false;
resetHeaderHeight（）;
}
}
/**
*stoploadmore,resetfooterview.
*/
publicvoidstopLoadMore（）{
if（mPullLoading==true）{
mPullLoading=false;
mFooterView.setState（XListViewFooter.STATE_NORMAL）;
}
mFooterView.setEnabled（true）;
}
/**
*setlastrefreshtime
*
*@paramtime
*/
publicvoidsetRefreshTime（）{
//mHeaderTimeView.setText（newDate（）.toLocaleString（））;
mHeaderTimeView.setText（date（））;
}
//获取系统时间
publicStringdate（）{
SimpleDateFormatsdf=newSimpleDateFormat（"yyyy-MM-ddHH:
mm:
ss"）;
Datedate=newDate（）;
Stringt=sdf.format（date）;
returnt;
}
privatevoidinvokeOnScrolling（）{
if（mScrollListenerinstanceofOnXScrollListener）{
OnXScrollListenerl=（OnXScrollListener）mScrollListener;
l.onXScrolling（this）;
}
}
privatevoidupdateHeaderHeight（floatdelta）{
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）;//scrolltotopeachtime
}
/**
*resetheaderview'sheight.
*/
privatevoidresetHeaderHeight（）{
intheight=mHeaderView.getVisiableHeight（）;
if（height==0）//notvisible.
return;
//refreshingandheaderisn'tshownfully.donothing.
if（mPullRefreshing&&height<=mHeaderViewHeight）{
return;
}
intfinalHeight=0;//default:
scrollbacktodismissheader.
//isrefreshing,justscrollbacktoshowalltheheader.
if（mPullRefreshing&&height>mHeaderViewHeight）{
finalHeight=mHeaderViewHeight;
}
mScrollBack=SCROLLBACK_HEADER;
mScroller.startScroll（0,height,0,finalHeight-height,
SCROLL_DURATION）;
//triggercomputeScroll
invalidate（）;
}
privatevoidupdateFooterHeight（floatdelta）{
intheight=mFooterView.getBottomMargin（）+（int）delta;
if（mEnablePullLoad&&!
mPullLoading）{
if（height>PULL_LOAD_MORE_DELTA）{//heightenoughtoinvokeload
//more.
mFooterView.setState（XListViewFooter.STATE_READY）;
}else{
mFooterView.setState（XListViewFooter.STATE_NORMAL）;
}
}
mFooterView.setBottomMargin（height）;
//setSelection（mTotalItemCount-1）;//scrolltobottom
}
privatevoidresetFooterHeight（）{
intbottomMargin=mFooterView.getBottomMargin（）;
if（bottomMargin>0）{
mScrollBack=SCROLLBACK_FOOTER;
mScroller.startScroll（0,bottomMargin,0,-bottomMargin,
SCROLL_DURATION）;
invalidate（）;
}
}
publicvoidstartLoadMore（）{
mPullLoading=true;
mFooterView.setState（XListViewFooter.STATE_LOADING）;
if（mListViewListener!
=null）{
mListViewListener.onLoadMore（id）;
}
mFooterView.setEnabled（false）;
HandlermHandler=newHandler（）{
@Override
publicvoidhandleMessage（Messagemsg）{
super.handleMessage（msg）;
XListView.this.stopLoadMore（）;
}
};
mHandler.sendEmptyMessageDelayed（0,4000）;
}
@Override
publicbooleanonTouchEvent（MotionEventev）{
if（mLastY==-1）{
mLastY=ev.getRawY（）;
}
switch（ev.getAction（））{
caseMotionEvent.ACTION_DOWN:
mLastY=ev.getRawY（）;
break;
caseMotionEvent.ACTION_MOVE:
finalfloatdeltaY=ev.getRawY（）-mLastY;
mLastY=ev.getRawY（）;
if（getFirstVisiblePosition（）==0
&&（mHeaderView.getVisiableHeight（）>0||deltaY>0））{
//thefirstitemisshowing,headerhasshownorpulldown.
updateHeaderHeight（deltaY/OFFSET_RADIO）;
invokeOnScrolling（）;
}elseif（getLastVisiblePosition（）==mTotalItemCount-1
&&（mFooterView.getBottomMargin（）>0||deltaY<0））{
//lastitem,alreadypulleduporwanttopullup.
updateFooterHeight（-deltaY/OFFSET_RADIO）;
}
break;
default:
mLastY=-1;//reset
if（getFirstVisiblePosition（）==0）{
//invokerefresh
if（mEnablePullRefresh
&&mHeaderView.getVisiableHeight（）>mHeaderViewHeight）{
mPullRefreshing=true;
mHeaderView.setState（XListViewHeader.STATE_REFRESHING）;
if（mListViewListener!
=null）{
mListViewListener.onRefresh（id）;
HandlermHandler=newHandler（）{
@Override
publicvoidhandleMessage（Messagemsg）{
super.handleMessage（msg）;
XListView.this.stopRefresh（）;
}
};
mHandler.sendEmptyMessageDelayed（0,4000）;
}
}
resetHeaderHeight（）;
}elseif（getLastVisiblePosition（）==mTotalItemCount-1）{
//invokeloadmore.
if（mEnablePullLoad
&&mFooterView.getBottomMargin（）>PULL_LOAD_MORE_DELTA）{
if（mFooterView.isEnabled（））{
startLoadMore（）;
}
}
resetFooterHeight（）;
}
break;
}
returnsuper.onTouchEvent（ev）;
}
@Override
publicvoidcomputeScroll（）{
if（mSputeScrollOffset（））{
if（mScrollBack==SCROLLBACK_HEADER）{
mHeaderView.setVisiableHeight（mScroller.getCurrY（））;
}else{
mFooterView.setBottomMargin（mScroller.getCurrY（））;
}
postInvalidate（）;
invokeOnScrolling（）;
}
puteScroll（）;
}
@Override
publicvoidsetOnScrollListener（OnScrollListenerl）{
mScrollListener=l;
}
@Override
publicvoidonScrollStateChanged（AbsListViewview,intscrollState）{
if（mScrollListener!
=null）{
mScrollListener.onScrollStateChang
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