第1节flutter app结构搭建1022课程评价

Flutter开发软件：VisualStudioCode、AndroidStudio移动端开发软件：Xcode、AndroidStudio硬件环境：MacOS（64-bit）、磁盘空间700MB(不包括Xcode或AndroidStudio的磁盘空间）、Flutter依赖工具bash, mkdir, rm, git, curl, unzip,Step1：exportPUB_HOSTED_URL=https://pexportFLUTTER_STORAGE_BASE_URL=注意：此镜像为临时镜像，并不能保证一直可用，参考参考UsingFlutterin Step2：配置Flutter cdcdunzip~/Downloads/flutter_macos_v0.5.1-添加flutter相关工具到pathexportexportPATH=`自己存放flutter的路径flutterdoctor查看安装结果如何（注：如果是想在iOS上运行，则不需要安卓相关AndroidStudio 设置安卓模拟器：启动AndroidStudio>Tools>Android>AVDManagerCreateVirtual硬件要求：Windows7或更高版本(64-bit)、磁盘空间400MB不包括AndroidStudio的磁exportexportPUB_HOSTED_URL=https://pexportFLUTTER_STORAGE_BASE_URL=Step2：配置Flutter将flutterC:\ProgramFiles在Flutter安 的flutter文件下找到flutter_console.bat，双击运行并启转到如果该条目存在追加flutter\bin的全路径，使用

，然后将flutter\bin为”U_HTD_UR”和TTER_SORGE_BASE_UR”的条目，如果没有，也添加它们。安装 fluttercreatefluttercreate方式二：AndroidFile>NewFlutter①View>Commandvarname='Jack';name='Rose';name=20;//Avalueoftype'int'can'tbeassignedtoavariableoftype'String'.print(name);varprint(age);intheight=print(height);ObjectObjectvalue1='Lucy';value1=22;dynamicvalue2='12';value2='LiLei';如果定义的变量不会发生变化，那么使用final或const，不是var，也不是一个类型。一final变量只能被初始化一次;const变量是一个编译时常量，const变量是隐式的finalfinaluserName=//userName='Rose';//'userName',afinalvariable,canonlybesetconstpi=//pi=3.4;//Constantvariablescan'tbeassignedaflnalconstvar同时使用StringStringgetUserInfo(Stringname,[int{if(height!=null)returnname+}return}StringStringgetUserInfo(Stringname,[intheight={if(height!=null)returnname+}return}([[([[Type]param1[,…]]){//(context)=>HomePage(widget.isDark,//func_name(context){returnHomePage(widget.isDark,finalfinaladdressBook=..name= = ..phone=..number= ..label=expr++expr--()[].-expr!expr~expr++expr--*/%<<&^|>=><=<asis===*=/=~/=%=+=-=<<=>>=&=^=intintscore=90;if(score>=90)}elseif(80>=score&&print('良}elseif(60>=score&&print('及格}print('}varvarlist=for(vari=0;i<list.length;i++)}for(varitemin{}{//while//whileinti=0;while(i<2)//do...whiledo}while(i>0&&i<for(vari=0;i<4;{if(i==2){}}for(vari=0;i<2;i++){for(varj=0;j<4;{if(j==1){}for(vari=0;i<4;i++){if(i==2)}}}for(vari=0;i<2;i++){for(varj=0;j<4;{if(j==1){}//language//language也可以是num、StringStringlanguage='java';switch(language){caseprint('dartlanguage');caseprint('javalanguage');caseprint('pythonlanguage');}//javaswitch(language)caseprint('dartlanguage');caseprint('javalanguage');continueTopTestcase'python':print('pythonlanguage');}javadefaultassert(textnull);assert(textnull);assert(number100);throwFormatException('抛出一个FormatException异常throw'数据 }onException(e){print('exception}catchprint('exceptiondetails:\n$e');print('stacktrace:\n$s');}onExceptioncatchprint('exceptiondetails:\n}}catchprint('exceptiondetails:\n$e');print('stacktrace:\n$s');print('Do} Stringname;intage;finalStringaddress=null;voidwork()print('Nameis$name,Ageis}void_work(){print('Nameis$_name,Ageis}}==.name=.age= Stringname;intage;()}(,.withName(Stringname){=name;}voidwork()print('Nameis$name,Ageis}}{finalStringname;finalintage;finalString(,this.age,voidwork()print('Nameis$name,Ageis$age,Genderis$gender,Heis}}voidmain() =('Tom',18,}classclassRectangle{numwidth;numheight;numleft;numRectangle(this.width,this.height,this.left,numgetright=>setright(numvalue)=>left=value-}ClassVectorClassVector{finalintx;finalintconst//重载加号+Vectoroperator+(VectorreturnnewVector(x+v.x,y+}}main()finalresult1=newfinalresult2=newfinalresult=result1+print('result.x='+result.x.toString()+''，+'result.y=//result.x=40,result.y=}ClassClass{void}voidvoid}}ClassHumanextends{void}void}}varanimal=newAnimal();valuehuman=newHuman();} classclassAnimal{ run();//抽象方法}}classDogextendseat(){}run(){TODOimplementrun}}classCatextendsAnimal{@overrideeat(){TODOimplementeat}run(){TODOimplementrun}}Dogd=newDog();Catc=newCat();Animala=new }ClassClassFirstvoidprint('imfirst}ClassSecondvoidprintprint('imSecond}}ClassA=SecondwithmainAa=newA();//imfirst}importimportimportimportimportimport'package:lib2/lib2.dart'asElementemelent1=newElement();//默认使用lib1里面的Elementlib2.Elementemelent2newlib2.Element();//使用lib2里面的Element注意：lib1/lib1.dart及lib2/lib2.dart里面都有lement类，如果直接就不知体哪个Ele