Peb npaj koj qhov kev pom! Kev ua tau zoo nrog ONMA scout android app kev txhim kho yog lav.
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Android Programmierung tsis yog ib qho txuj ci yooj yim kawm. Muaj ntau hom lus xaiv los ntawm, xws li Java, Lub Hom Phiaj-C, Swift, thiab Kotlin. Qhov tseem ceeb yog pib thiab tsim koj cov kev txawj ntse maj mam. Tau txais kev pab thiab kev tawm tswv yim los ntawm lwm tus yog qhov tseem ceeb. Muaj ntau ntau qhov kev pab cuam los pab koj pib.
Tsim Android-Apps ib txwm txhais tau tias kawm yuav ua li cas code hauv Java. Koj tuaj yeem kawm paub yuav ua li cas code nrog Android-Studio. Yog xav paub ntxiv, Koj tuaj yeem nrhiav Android-Kurse, xws li cov uas muaj los ntawm Michael Wilhelm. Hoob no yuav pab kom koj paub txog ntau yam lus syntaxes thiab idioms, nrog rau yuav ua li cas siv ntau yam cuab yeej Android.
Android app developers feem ntau siv Java vim nws yooj yim kawm thiab muaj ntau yam tseem ceeb uas ua rau nws yog ib hom lus zoo rau kev txhim kho Android. Cov no suav nrog kev ywj pheej platform, object-orientation, thiab kev ruaj ntseg. Java kuj tseem muaj ntau lub tsev qiv ntawv thiab lwm yam nta, uas ua rau nws yooj yim rau kev tsim thiab tswj cov ntawv thov dua li lwm yam lus programming.
Android txhawb nqa ob hom hlua: haiv neeg thiab tswj code. Haiv neeg code yog sau rau hauv Java lossis Kotlin thiab muab tso ua ke rau hauv bytecode tib yam li Java. Ntxiv rau Java, Android kuj txhawb Kotlin. Kotlin yog ib hom lus programming uas siv cov lus Java thiab muab tso ua ke rau bytecode zoo ib yam li Java.
Lwm qhov tseem ceeb hauv Kotlin yog hom kev xav. Nws cia lub compiler cia li ntes cov hom ntawm qhov sib txawv los ntawm nws qhov pib, txo qhov kev xav tau ntawm kev kuaj xyuas. Kotlin kuj tseem muaj lub compiler plugin uas pab koj ua cov lus piav qhia yooj yim.
Objective-C yog thawj hom lus programming rau iOS thiab OS X. Nws yog ib qho superset ntawm C thiab muab cov khoom-oriented peev xwm thiab ib tug dynamic runtime. Nws tau txais txiaj ntsig C hom lus tseem ceeb tab sis kuj ntxiv cov lus txhais lus hauv chav kawm thiab qib lus txhawb rau kev tswj hwm cov duab kos.. Nws kuj muaj dynamic typing thiab defers ntau lub luag hauj lwm rau lub runtime.
Lub Hom Phiaj-C tau tsim los ntawm Stepstone hauv xyoo 1980s thiab tau ua cov lus programming de facto rau iOS thiab macOS tau ntau xyoo. Qhov project mulle-objc yog qhov rov ua dua ntawm cov lus uas txhawb nqa GCC thiab Clang/LLVM compilers. Nws kuj txhawb Windows, Linux, thiab FreeBSD.
Cov lus txhawb dynamic typing, tso cai rau koj los hloov qhov loj ntawm koj chav kawm thiab tseem tuav binary compatibility. Nws kuj tseem txhawb nqa cov piv txwv sib txawv uas tau tsim los ntawm lub sijhawm ua haujlwm thiab tshaj tawm hauv chav kawm interface. Ntxiv mus, nws muaj qhov ceev enumeration syntax uas ua haujlwm sib npaug rau NSEnumerator cov khoom.
Thaum Objective-C muaj ntau qhov zoo dua Swift, nws tseem tsis yog qhov kev xaiv zoo tshaj plaws rau txhua tus programmer. Cov lus tsis yog neeg siv-phooj ywg, thiab nws nyuaj rau kev debug yog tias koj tsis paub yuav siv nws li cas. Qhov tsis zoo tshaj plaws yog tias nws tsis muaj zog npaum li cov lus Swift, tab sis nws yooj yim dua thiab hloov tau.
Programming Android apps tuaj yeem nyuaj yog tias koj tsis paub yuav ua li cas hauv Swift. Cov lus tshiab yog raws li hom lus LLVM, uas yog qhib qhov chaw compiler. Nws tsim cov cai sib dhos rau ARM processors thiab hloov qhov ntawd mus rau lub tshuab code. Android's haiv neeg NDK tsim binary txuas tawm tsam cov khoom tsim cov ntaub ntawv, uas yog tom qab ntawd ntim rau hauv Android app.
Swift yog ntau lub ntsiab lus programming lus uas tuaj yeem siv los tsim cov ntawv thov hauv Android thiab iOS. Nws muaj kev nyab xeeb dua li Objective-C thiab muaj ntau yam nta. Nws kuj yog yooj yim kawm. Nws txhawb rau Cocoa moj khaum, suav nrog Cocoa Touch, pab cov neeg tsim khoom saib lawv cov software ua ntej tso tawm. Nws kuj tseem siv Objective-C runtime thiab LLVM compiler moj khaum.
Qhov teeb meem ntawm cov tsev qiv ntawv cross-platform yog qhov paub zoo, thiab tsis yog tshwj xeeb rau Android. Piv txwv li, kev lag luam video game tau siv cov tsev qiv ntawv hla platform rau ntau xyoo lawm. Cov tsev qiv ntawv tseem ceeb yog OpenGL, SDL, thiab OpenAL. Kuj tseem muaj cov tsev qiv ntawv rau fonts, suab, thiab ua duab. Rau kev sib txuas lus, lub platform siv cURL. Lwm lub tsev qiv ntawv tseem ceeb yog Chipmunk, uas muab lub cav physics rau PureC.
XML yog ib hom lus cim uas tuaj yeem siv los piav qhia txog kev teeb tsa thiab ntxiv cov ntsiab lus rau cov ntaub ntawv. Nws tau siv dav hauv kev tshaj tawm kev lag luam rau ntau xyoo lawm thiab tuaj yeem siv rau hauv kev ua haujlwm hauv Android. Nov yog kev taw qhia rau XML rau Android programming. Nws yog ib qho tseem ceeb ntawm kev tsim cov neeg siv khoom nplua nuj rau koj lub Android app.
Hauv Android Studio, koj yuav pom ntau yam ntaub ntawv XML uas ua haujlwm sib txawv. Piv txwv li, koj yuav muaj ViewGroup, LinearLayout, thiab RelativeLayout, uas muaj cov Saib thiab tag nrho nws cov menyuam widgets. Koj tseem yuav pom tias ViewGroup nyob hauv qab View, thiab View muaj View. Peb hom ntaub ntawv no yuav tsim ib qho screen hauv Android app.
XML yog ib hom lus sib sib zog nqus uas khaws cov ntaub ntawv siv hauv daim ntawv thov. Xav txog nws zoo li daim ntawv nthuav qhia: nws khaws tag nrho cov ntaub ntawv thiab layout ntawm kab thiab teb. Nws tseem tuav cov kev suav uas tau ua. XML kuj tseem siv los txhais cov layouts, xim, hom, thiab qhov ntev hauv daim ntawv thov Android. XML yog ib hom lus yooj yim kawm thiab siv ua ke nrog cov lus programming.
Yog hais tias koj xav kawm yuav ua li cas rau kev pab cuam ib tug Android app, koj tau tuaj rau qhov chaw. Peb cov chav kawm online yog tsim los ntawm ib pawg 35 modules uas npog txhua yam ntawm kev txhim kho app. Txawm hais tias koj tsis xav tau ntau yam kev paub txog programming kom nkag siab thiab siv qhov kev kawm no, Koj yuav tsum tsawg kawg muaj qee qhov kev paub hauv computer programming.
Ntxiv nrog rau kev nkag siab txog cov hauv paus ntsiab lus ntawm programming, Koj tseem yuav kawm txog lub operating system thiab cov qauv ntawm ib qho app. Qhov no yuav tso cai rau koj los tsim cov apps uas sib xws nrog ntau lub operating system. Kev cob qhia kuj tseem yuav hais txog kev sau cov lej nyeem tau li cas. Qhov no yog qhov tseem ceeb rau kev tsim cov apps rau cov khoom siv mobile.
Android yog qhov nrov mobile operating system. Raws li qhov tshwm sim, Cov neeg tsim khoom hauv Android yog qhov xav tau siab thiab muaj kev cia siab rau txoj haujlwm zoo. Koj yuav kawm txog Android platform, Android kev txhim kho ib puag ncig, thiab Kotlin programming lus.
Kotlin yog ib hom lus programming rau Android uas tau ua tiav nrog Java 6. Qhov no txhais tau hais tias Java developers yuav tuaj yeem sau cov ntawv thov hauv Android thiab siv Kotlin. Txawm li cas los, vim Android tsis yog ib lub platform, Tej zaum nws yuav nyuaj rau Java developers hloov mus rau Kotlin.
Ib qho piv txwv ntawm Android app sau hauv Kotlin yog Pinterest app. Kotlin yog ib txoj hauv kev zoo los sau cov ntawv thov rau cov khoom siv txawb. Yog tias koj xav kawm ntxiv txog cov lus programming no, nyeem qee cov ntawv no. Christina Lee sau txog nws qhov kev paub siv hom lus. Ntxiv rau, koj tuaj yeem mus xyuas Kotlin lub vev xaib kom pom cov npe loj hlob ntawm cov tuam txhab uas siv nws.
Kotlin yog ib hom lus programming uas ua haujlwm nyob rau ntawm Java virtual tshuab. Cov lus no yog qhib qhov chaw thiab muaj kev qhia txog kev nyab xeeb, kev meej, thiab kev sib koom tes. Nws muaj ntau lub peev xwm los txhim kho Android kev txhim kho, thiab nws tau txais ib tug loyal developer puag.
Cov neeg tsim khoom uas paub txog Java tuaj yeem yooj yim txav mus rau Kotlin, raws li nws yuav tsum tau tsuas yog ob peb teev los kawm. Nws kuj txhawb kev ua haujlwm ua haujlwm thiab coroutines, uas yog ib qho zoo ntxiv rau Android developers. Nws kuj txo tus lej code uas tus tsim tawm xav tau sau.