黑馬程序員android常用控件

可以指定layout_weightlayout_weigthlayout_weightlayout_widthheight=”0dp”配合使用，指定的控件所占寬/高ExpandableListViewListViewListView；ListView類似；AdapterpublicViewgetGroupView()viewview ：返回某個位置對應的孩子的view對象view布局 //父publicclassExpandParentInfo{//父publicclassExpandParentInfo{privateStringname;privateintid;privateList<ExpandChildrenInfo>｝//子publicclassExpandChildrenInfoprivateintprivateStringprivateString｝//子 publicList<ExpandParentInfo>queryExpandData()List<ExpandParentInfo>List<ExpandParentInfo>list=newArrayList<ExpandParentInfo>(10);Databasedb=getDB();Cursorc=db.rawQuery("SELECTidx,nameFROMclasslist",null);while(c.moveToNext()){ExpandParentInfoparentnewExpandParentInfo(c.getInt(0c.getString(1));getChildren(parent,db); //獲取還在}close(c,return}@paramprivatevoidgetChildren(ExpandParentInfoparent, Databasedb){List<ExpandChildrenInfo>list=newArrayList<ExpandChildrenInfo>(10);Stringsql="SELECT_id,number,nameFROMtable"+parent.getId();Cursorc=db.rawQuery(sql,null);while(c.moveToNext())ExpandChildrenInfoinfo=newExpandChildrenInfo(c.getInt(0),c.getString(2),}this.close(c,null);}List<ExpandParentInfo>List<ExpandParentInfo>datas=dao.queryExpandData();ExpandableListViewelv=(ExpandableListView) elv.setAdapter(newBaseExpandableListAdapter(){publicViewgetGroupView(intgroupPosition,booleani panded,ViewconvertView,ViewGroupparent){TextViewtv=newTextView(getApplicationContext()); "+datas.get(groupPosition).getName());return}publicViewgetChildView(intgroupPosition,intchildPosition,isLastChild,ViewconvertView,ViewGroupparent)TextViewtv=newTextView(getApplicationContext());ExpandChildrenInfoinfo=return"+info.getName()+"+}@param publicintgetChildrenCount(intgroupPosition)return}publicintgetGroupCount()return}publicbooleanisChildSelectable(intgroupPosition,intchildPosition)return}publicbooleanhasStableIds()return}publiclonggetGroupId(intgroupPosition)return}publicObjectgetGroup(intgroupPosition)return}publiclonggetChildId(intgroupPosition,intchildPosition)return}publicObjectgetChild(intgroupPosition,intchildPosition)return}ListViewfastScrollEnabledprivateBaseAdapter*privateBaseAdapter*privateHandlerhandler=newHandler()//數(shù)據(jù)適配器publicvoidhandleMessage(android.os.Messagemsg){ //加載進度條if(adapter==null){ lv_call_sms_safe=(ListView)adapteradapter=newMyCallSmsSafeAdapter();}else //復用舊的數(shù)據(jù)適配器,通知數(shù)據(jù)}privatevoidfillData(){ //顯示加載//dao查詢可能是耗時的操作，在新 newThread()publicvoidrun()if(numbers!=null){numbers.addAll(dao.queryPartBlackNumbers(startIndex,maxNumber));}elsenumbers=dao.queryPartBlackNumbers(startIndex,} }privateclassMyCallSmsSafeAdapterextendsBaseAdapterpublicintgetCount()1.listView展示的條數(shù)return}publicViewgetView(finalintposition,ViewconvertView,ViewGroupparent)2.具體顯示的條目Viewview=ViewHolderholder Viewif(convertViewnull&&convertViewinstanceofRelativeLayoutLog.i(TAG,"歷史緩存對象可復用:"+position);view=holderViewHolder //取出ViewHolder象}elseLog.i(TAGView1.復用歷史緩存view對象減少布局文件轉(zhuǎn)化成view2.查找孩子也是個耗時的操作，在創(chuàng)建view把孩子 給存起TextViewtv_number=(TextView)view.findViewById(R.id.tv_number);TextViewtv_mode=(TextView)view.findViewById(R.id.tv_mode);ImageViewiv_remove=(ImageView)view.findViewById(R.id.iv_remove);holder=newViewHolder(); View對象容器，保存

holder.tv_mode=tv_mode;holder.tv_number=tv_number;holder.iv_remove=iv_remove; //將holder}BlackNumberblackNum=numbers.get(position);BlackNumberblackNum=numbers.get(position);holder.iv_remove.setOnClickListener(newOnClickListener(){publicvoidonClick(Viewv)BlackNumbertempNum=numbers.get(position);除}if(blackNum.getMode().equals(BlackNumberDao.MODE )){ }return}publicObjectgetItem(intposition)return}publiclonggetItemId(intposition)4.獲取選中條目的return}publicbooleanisEnabled(intposition)//return}}ViewListViewView中的孩子，定義成static/**/**View對象容器，用來保存ListView條目的View中的孩 staticclassViewHolder{TextViewtv_number;TextViewtv_mode;ImageViewiv_remove;}ListView3 privatevoidinitListViewScrollListener(){lv_call_sms_safe.setOnScrollListener(newOnScrollListener(){//當滾動狀體發(fā)生變化的時候調(diào)用的方法（滾動狀態(tài)：1.手指按下移動；2.慣性滾動即publicvoidonScrollStateChanged(AbsListViewview,intscrollState)switch(scrollState)case //在靜止狀態(tài)下關(guān)心最后一個可見的條目如果最后一個可見條目就是數(shù)據(jù)適配器里面的最后一個,加載 intposition=intsize=if(position==size-1)if(startIndextotalCount }startIndex+= }casecase態(tài)}}//當listviewpublicvoidonScroll(AbsListViewview,intfirstVisibleItem,intinttotalItemCount)}}將中所有安裝的應用分割成2個集合一個存放用戶安裝的一個存放系統(tǒng)自帶的ListViewgetCount方法，返回的條目的個數(shù)為用戶的+系統(tǒng)自ListView的滾動，動態(tài)設置分類標題；具**填充數(shù)據(jù)privatevoidfillData()newThread()publicvoidrun()appInfos=userAppInfos=newsystemAppInfos=new//系統(tǒng)的for(AppInfoappInfo:appInfos)if(appInfo.isUserApp())}//更新界面操作，Activity中的方法，它是運行在主 的，原理是利用runOnUiThread(newRunnable()publicvoidrun()if(adapter==null)adapter=newAppManagerAdapter();}else}}ListViewprivateclassAppManagerAdapterextendsBaseAdapter{publicintgetCount()returnuserAppInfos.size()+systemAppInfos.size()+}publicViewgetView(intposition,ViewconvertView,ViewGroupparent)1.提示標題條目==if(position0 //返回TextViewTextViewtv=newTextView(getApplicationContext());tv.setTextuserAppInfos.sizereturn}if(position==userAppInfos.size()+1){ //返回TextView對TextViewtv=newTextView(getApplicationContext());tv.setTextsystemAppInfos.sizereturn}//==2.程序標題條目==Viewview=null;ViewHolderholdernull;if(convertView!=null&&convertViewinstanceofRelativeLayout){view=convertView;holder=(ViewHolder)}elseholder=newViewHolder();holder.iv_Icon=(ImageView)view.findViewById(R.id.iv_app_icon);holder.tv_name=(TextView)view.findViewById(R.id.tv_app_name);}AppInfoappInfo=if(position<=userAppInfos.size())appInfo=userAppInfos.get(position-}elseappInfo=systemAppInfos.get(position-userAppInfos.size()- }holder.tv_location.setText(appInfo.isInRom()?" 內(nèi)存":"外部 returnreturn}}/**靜態(tài)內(nèi)部類，保存View中的孩子的引入staticclassViewHolderImageView //圖標TextView //名稱TextView } ListView的滾 *添加滾動privatevoidsetOnScrollListener(){lv_app_manager.setOnScrollListener(newOnScrollListener(){//滾動狀態(tài)發(fā)生變化.publicvoidonScrollStateChanged(AbsListViewview,intscrollState)firstVisibleItempublicvoidonScroll(AbsListViewview,intfirstVisibleItem,intinttotalItemCount)//界面初始化的時候，也會執(zhí)行滾 //根據(jù)當前滾動的狀態(tài),更新tv_statusif(userAppInfos!=null&&systemAppInfos!=null)if(firstVisibleItem>=userAppInfos.size()+1){tv_status.setTextsystemAppInfos.size}else}}}}CheckboxlistView的第一個條目的checkbox選中時，拖動，至第一個條目移除屏幕，這時checkbox也選中了；有條目中含有checkbox控件時，條目的onitemclick失效；ListViewgetViewview1個問Chebox2個問題；beanbeancheckboxclickfocus，android:clickable="false"條目的OnItemClickListener，手動設置界面checkbox與數(shù)據(jù)bean的選中狀getViewbeancheckbox的選中狀態(tài)；lv_process_manager.setOnItemClickListener(newOnItemClickListener(){publicvoidlv_process_manager.setOnItemClickListener(newOnItemClickListener(){publicvoidonItemClick(AdapterView<?>parent,Viewview,intposition,long{TaskInfotaskInfo=(TaskInfo)if(taskInfo!=null){ //取反//執(zhí)行上面那句代碼實際，數(shù)據(jù)bean已選擇，但是界面上的checkboxCheckBoxcb=(CheckBox)view.findViewById(R.id.cb_status);}} //通過數(shù)據(jù)beanPopupWindowPopupPopupWindow須定義成ActivityPopupPopupWindowPopupWindows對象一定要記得設置背景，否則不能獲得焦點，與實現(xiàn)動畫；privateprivatePopupWindow1.創(chuàng)建popupTextViewtvnewTextView(getApplicationContext()); //創(chuàng)建Popup對象(高100，寬pupop=newPopupWindow(tv,LayoutParams.WRAPCONTENT,LayoutParams.WRAPCONTENT);//設置背景（一定要設置，否則不能獲得焦點，不 //設置顯示位置，與布局（左上角對其,距離left的距離50，距離top為100）pupop.showAtLocation(tvavailsdGravity.LEFT|Gravity.TOP50protectedvoidonDestroy(){if(pupop!=null&&pupop=null;}}popup1popup存在，即刪除掉if1popup存在，即刪除掉if(popup!=null&&popup.isShowing()){popup=}2.指定要顯示的intlocationnew //獲取點擊的view置3.創(chuàng)建popuppopup.showAtLocation(parent,Gravity.LEFT|Gravity.TOP,70,location[1]);//ScaleAnimationsa=newScaleAnimation(0.5f,1.2f,0.5f,1.2f);TranslateAnimationta=newTranslateAnimation(0,20,0,0);AnimationSetset=new//縮放//位移效果//動畫集合，widgets是一個嵌入其他應用中執(zhí)行的小程序（如嵌入在桌面，有點類似于快捷圖標widgets的選項框，4.0widgets注意：如果在模擬器上widget出不來，可能是文件中配置了程序的安裝路徑，去WidgetsAppWidetroviderpublic //元數(shù)據(jù)android:resource="@xml/example_appwidget_infoinitialLayout：minHeight/minWidth:widgetCategory:home_screen|keyguard：桌面|<appwidget-providerxmlns:android="http:// onReceive onEnabled widget創(chuàng)建時與當時間片到的時候（updatePeriodMillis的設置的時間，默認為半個小時（ onDisabled() widget移除時，執(zhí)行，表示禁用，可在此做一些掃尾的widgetwidget程間的通信，需要使用到ipcinterprocesscommunication；通過上面對生命周期的分析，可將啟動服務放入onEnabledonDisabled中；java的序列化接口，widget就從這個公共的內(nèi)存中取數(shù)據(jù)，publicclasspublicclassUpdateWidgetServiceextendsService/**定時任務privateTimerTasktask;privateTimertimer;publicvoidonCreate(){timer=newTimer();task=newTimerTask()publicvoidrun()//更新widgetAppWidgetManagerawm= ComponentNameprovidernew2個進程間通信ipcinterprocesscommunicationRemoteViews實現(xiàn)了Parcelable接口RemoteViewsviews=new//設置數(shù)據(jù)MemoryInfomemoryInfo=Formatter.formatFileSize(getApplicationContext(),memoryInfo.availMem));Intent意圖,發(fā)廣播開啟activity開PendingIntentIntentintent=newIntent(); PendingIntentpendingIntentPendingIntent.getBroadcast(getApplicationContext(),0,intent,0);}timer.schedule(task2000 //循環(huán)執(zhí)行}publicvoidonDestroy(){task=null;timer=null;}publicclasspublicclassProcessWidgetextendsAppWidgetProvider{publicvoidonEnabled(Contextcontext)//