Peb npaj koj qhov kev pom! Kev ua tau zoo nrog ONMA scout android app kev txhim kho yog lav.
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Yog tias koj tau xav txog kev tsim lub tsev hauv app, tej zaum koj yuav xav paub seb puas yog Java, C #, Kotlin, XML, lossis lwm cov lus programming tau siv. Koj yuav pom cov lus teb rau cov lus nug no hauv kab lus no. Ua ntej koj pib sau koj app, Kawm cov hauv paus ntawm txhua tus. Ces, Txav mus rau cov ncauj lus siab dua. Txawm hais tias koj sau koj thawj lub xov tooj txawb, lossis yog tias koj ua haujlwm ntawm kev lag luam-tseem ceeb thov, Nws muaj Android app txoj kev daws teeb meem uas ua haujlwm rau koj.
Kawm paub yuav ua li cas Code hauv Java yog qhov tseem ceeb ntawm Android App Kev Tsim Kev Txhim Kho. Java yog cov lus muaj zog tshaj lij uas tso cai rau cov neeg tsim tawm los tsim cov apps sib tham uas cov neeg siv tuaj yeem cuam tshuam nrog. Cov lus programming no ua rau cov neeg tsim khoom lag luam los tsim cov ntawv thov siv ntau yam qauv cov qauv, Xws li cov hlua thiab cov lej. Android Apps Yuav Tsum Tau Siv Ntau Hom Cov Qauv Cov Qauv, uas yuav tsum muaj kev nkag siab zoo ntawm cov lus. Txhawm rau kawm java rau Android app kev loj hlob, Pib los ntawm kev kawm cov hauv paus ntawm cov qauv kev teeb tsa.
Lwm cov txiaj ntsig tseem ceeb rau kev kawm Java rau Android app kev txhim kho yog qhov tseeb tias cov lus tau nruab nrog lub tsev qiv ntawv loj ntawm kev tsim qauv tsim qauv. Cov tsev qiv ntawv no muab cov neeg tsim tawm nrog lub hauv paus ruaj khov uas yuav tsim lawv cov apps. Qhov no tso cai rau cov neeg tsim tawm los tsim cov kev siv complex yam tsis muaj kev txau ntawm kev siv ntawm lwm cov apps. Java tseem muab lub hauv paus ruaj khov rau kev tsim cov ntawv thov txawb, ua rau nws yooj yim tsim cov apps uas tuaj yeem loj hlob nrog cov kev xav tau ntawm koj cov neeg siv.
Yog tias koj npaj siab siv Java rau Android app kev loj hlob, Koj yuav tsum paub tias cov lus tsis pub dawb. Oracle yog npaj los hloov nws tus qauv lovent rau java hauv 2019 thiab yuav tsis pub cov neeg tsim khoom siv tau siv cov lus dawb. Koj kuj tseem tuaj yeem siv lwm txoj kev xaiv rau Java, xws li kotlin, uas yog siv dawb. Txawm li cas los, Yog tias koj siv Java rau Android app kev loj hlob, Nws yog ib qho tseem ceeb kom tau txais cov lus qhia raug cai.
Yog tias koj tab tom nrhiav rau kev tsim kho Android app, Koj yuav tsum siv c #. Cov khoom-qhia hom lus yog zoo sib xws rau Java tab sis muaj cov yooj yim syntax. Nws tseem yog lub qhov rais-lus xwb. Nws cov txiaj ntsig suav nrog kev nkag siab yooj yim, Ib txoj kev kawm yooj yim, thiab muaj ntau yam nta. Txawm li cas los, Yog tias koj tab tom nrhiav kom ua qhov kev ua si yooj yim, Koj yuav xav siv C ++.
Koj tseem tuaj yeem siv Kotlin los txhim kho Android apps. KOTLIN yog ib qho lus sau uas siv Java Virtual tshuab (JVM). Nws muab cov kab mob huv thiab meej, Ua nws nrov ntawm Android App Tsim. Java Programming lus yog qhov qub tshaj plaws ntawm txhua cov lus txheej txheem loj programming, Tab sis nws tseem muaj kev xaiv nrov vim tias nws lub tsev qiv ntawv dav dav thiab hla kev sib xyaw ua ke. Kotlin tau tsim los ntawm JetBrains, Lub tuam txhab uas ua rau Java.
Kev tsim nyog tshaj plaws ntawm Android kev tsim kho yog nws tsis muaj kev tswj hwm qauv thiab cov txheej txheem. Lub fragmentation ntawm Android li ua rau nws nyuaj los daws cov malware. Koj kuj tseem tuaj yeem pom tias qee cov tuab ua txhaum cai patents lossis lwm cov kev cai. Nws yog ib qho tseem ceeb kom nco ntsoov tias Android cov neeg siv tau txo peev xwm them tau ntau dua li cov neeg siv iOS. Yog li ntawd, Nws yog ib qho tseem ceeb kom ua kom cov yam ntxwv hauv lub siab thaum tab tom txhim kho Android app. Yog koj xav txog kev kawm C # rau Android App Stration, Nws yog qhov zoo tshaj plaws los pib nrog txoj haujlwm me me.
Tej zaum koj tau hnov txog Kotlin rau Android App Stration, tab sis koj puas paub tseeb tias koj xav sim nws? Muaj ntau cov txiaj ntsig ntawm kev kawm kotlin. Tsis yog nws tsuas yog nws muab cov lus programming niaj hnub, Nws tseem muaj cov kab me dua. Qhov no txhais tau tias koj lub app yuav mus txog lub lag luam sai dua thiab yuav ruaj khov. Kotlin tau raug txhawb nqa ntawm Android los ntawm Google. Ntxiv rau kev yooj yim kawm, Nws kuj yog qhov tsawg dua li java.
Java tseem yog cov lus uas nrov tshaj plaws rau Android App Stration, tab sis kotlin tau txais cov koob meej ntawm cov neeg tsim khoom. Nws compatibility nrog java thiab hom phiaj c txhais tau tias koj yuav muaj peev xwm siv nws yam tsis muaj kev txhawj xeeb txog cov teeb meem lus tshwj xeeb. Qhov no txhais tau tias koj yuav txuag lub sijhawm nyob ntawm cov kab mob kev xeem thiab kev lees paub zoo, thiab tuaj yeem tsom rau kev tsim cov apps zoo nrog kev siv zog tsawg dua. Ntxiv rau, Kotlin tuaj yeem ua tau zoo dua li Java, uas txhais tau tias koj yuav muaj peev xwm siv tsawg dua ntawm koj lub sijhawm muaj txiaj ntsig los txhim kho Android apps.
Ib qho ntawm cov txiaj ntsig loj tshaj plaws ntawm Kotlin rau Android app kev loj hlob yog nws kev me nyuam saws sai. Vim tias Kotlin yooj yim kawm thiab tswj hwm, Nws tau ua cov lus ntawm kev xaiv rau ntau tus neeg tsim khoom. Qhov tseeb, Nws yog txoj kev loj tshaj plaws loj hlob ntawm cov lus hauv kev ua lag luam, txoj cai tom qab nrawm. Ntxiv rau, Koj tuaj yeem siv tag nrho Android cov tsev qiv ntawv, suav nrog kev khi cov ntaub ntawv, kev annotation, thiab ntau dua. Kotlin tuaj yeem pab koj tsim cov ntawv thov sai dua li yav dhau los, thiab koj yuav tuaj yeem siv lawv sai dua thiab ua tau zoo dua.
XML yog cov lus cim siv hauv Android app tsim kho. Nws yog siv los tsim, lub tsev, thiab txheeb xyuas cov ntaub ntawv. Hom ntawv no yog tsim los siv rau hauv lub vev xaib. Nws lub teeb yuag, txuas ntxiv, thiab yooj yim syntax ua rau nws zoo tagnrho rau kev txhim kho mobile. Android app developers raug txhawb kom kawm XML thiaj li tsim tau ib daim ntawv thov ua tiav. Nov yog qee qhov laj thawj siv XML hauv koj qhov project Android tom ntej.
Android layouts yog sau nyob rau hauv XML thiab txhais cov qauv ntawm cov neeg siv interface ntsiab. Ib daim ntawv layout yuav tsum muaj cov hauv paus ntsiab lus, xws li View class, uas sawv cev rau tus neeg siv khoom siv interface. Saib Groups, uas sawv cev rau layout ntim ntawm View object, yog subclasses ntawm Saib. XML zoo li lub database, tshwj tsis yog nws tsis muaj teeb meem tshwm sim ntawm HTML thiab CSS. Ib qho khoom saib yog ib thaj tsam ntawm qhov screen. XML tuaj yeem siv los txheeb xyuas qhov layout thiab qhov loj ntawm ib qho View object.
Cov ntaub ntawv XML feem ntau yog siv hauv cov ntawv thov hauv Android los ua kom kev tshawb nrhiav tau zoo dua thiab txhim kho cov ntaub ntawv sib pauv. Siv XML hauv Android app txhim kho zoo ib yam li siv cov qauv ntaub ntawv rau kev sib pauv ntaub ntawv. Ntxiv rau, nws muab cov ntsiab lus teb rau cov ntaub ntawv, ua kev tshawb nrhiav thiab kev sib pauv ntaub ntawv ntse dua. Nws lub hauv paus pib hnub rov qab mus rau hnub pib ntawm Android, thiab nws txoj kev siv hauv kev lag luam luam tawm tau hloov zuj zus. Siv XML hauv Android app kev txhim kho tsis yog yooj yim dua thiab siv tau zoo dua tab sis yuav pab koj tsim cov apps ua haujlwm zoo dua.
Hauv ntiaj teb kev txhim kho Android, fragmentation yog ib txoj hauv kev los faib ib qho kev ua ub no rau hauv me me chunks. Cov chunks no yog hu ua fragments thiab nyob hauv ViewGroup ntawm tus tswv cuab Kev Ua Haujlwm. Fragments tuaj yeem muab cov tsos ntawm qee yam hauv XML lossis Java. Lawv kuj override txoj kev onCreateView los txuas lawv cov tsos nrog cov haujlwm. Muaj peb txoj hauv kev tseem ceeb uas ib feem yuav tsum siv.
Hauv Android app kev txhim kho, koj tuaj yeem tsim cov seem ntawm koj cov haujlwm, txhua yam uas muaj cov neeg siv interface tivthaiv. Fragments tuaj yeem ua tau zoo li qub lossis dynamic, thiab koj tuaj yeem siv ob qho tib si los tsim qhov zoo thiab kev xav ntawm koj daim ntawv thov. Ntawm no yog ib qho kev ua piv txwv, uas qhia txog ob ntu rau tes thiab ntsiav tshuaj. Koj tuaj yeem siv chav kawm qhov chaw xws li FrameLayout los tsim Fragment rau koj cov haujlwm.
Txoj kev fragment kuj tseem siv tau rau kev kho koj qhov kev txiav txim bar. Nws yog ua tau kom dynamically ntxiv thiab tshem tawm fragments, thiab nws lub neej voj voog yog cuam tshuam ncaj qha los ntawm kev ua haujlwm lub neej voj voog. Fragments kuj muaj ib lub voj voog lub neej tshwj xeeb, yog li koj yuav tsum paub txog qhov no thaum tsim koj daim ntawv thov. Fragments kuj yooj yim los tswj vim lawv tuaj yeem muab ntxiv thiab tshem tawm los ntawm kev ua haujlwm dynamically. Ntxiv mus, fragments tso cai rau koj siv ntau cov ntxaij vab tshaus thiab layouts.
Ib txoj hauv kev los tsim cov apps rau Android yog siv Linux Kernel. Lub Linux kernel yog qhov tseem ceeb ntawm Linux operating system. Nws yog ib qho txheej txheem ntawm cov txheej txheem uas tswj kev nkag mus rau cov peev txheej, xws li sensors. Cov txheej txheem no hu ua init process, thiab lawv yog lub luag haujlwm rau kev pib ua haujlwm ib puag ncig, tsim kev sib txuas thiab cov ntaub ntawv systems, thiab teeb tsa cov kev pabcuam xws li selinux. Txhawm rau siv Linux Kernel hauv Android app, koj yuav tsum xub kawm txog nws cov architecture.
Nws yog ib qho tseem ceeb kom nkag siab qhov sib txawv ntawm Android's hardware architecture thiab Linux kernels. Vim ob leeg sib txawv heev, lub kernel yuav txawv. Qee cov khoom siv kho mob yuav muaj tus tswv tsav tsheb. Qhov no tuaj yeem ua rau tsim cov apps rau Android nyuaj. Txawm hais tias qhov no tsis yog qhov teeb meem tshwm sim, kawm paub siv Linux Kernel tuaj yeem ua rau cov neeg tsim khoom muaj txiaj ntsig thaum tsim cov apps. Nws kuj tseem ceeb heev uas yuav tsum nco ntsoov tias Linux ntsiav txhawb ntau qhov sib txawv.
Linux Kernel hloov tshiab tau ntev dhau los ua qhov tsis sib haum xeeb. Thaum qee cov neeg siv hais txog qhov xav tau kom tsis txhob rov ua dua OS hauv lawv lub xov tooj, lwm tus tau sib cav tias cov kernels no yuav ua rau muaj kev ruaj ntseg ua txhaum cai. Yog li ntawd, tej zaum nws yuav zoo dua los siv cov generic kernel. Google tseem tab tom qhia txog lub moj khaum tshiab hu ua GKI uas yuav tso cai rau Android lub hauv paus ua haujlwm ntawm cov khoom siv uas tsis muaj software tshwj xeeb..