Yuav ua li cas Programming ntawm Android App

Thaum nws los ua rau Android apps, Kawm txoj cai programming lus yog qhov tseem ceeb. Cov txheej txheem qauv rau kev txhim kho cov apps no tsis nruj thiab txwv cov programmers’ kev ywj pheej. Cov hau kev no tau siv los tsim cov apps yooj yim, Tab sis yog tias koj xav hloov kho lawv, Koj yuav tsum kawm Java code thiab technical paub-li cas.

Java

Lub cajmeem Android app tsis yog ib qho yooj yim, thiab yuav tsum muaj kev nkag siab tob txog Java. Ua tsaug, Muaj cov cuab yeej siv-tsev uas tuaj yeem pab nrog txoj kev txhim kho. Yog tias koj tsis paub Java, Tus pib cov lus qhia rau cov lus tuaj yeem pab koj pib.

Cov lus qhia no npog cov ntsiab lus tseem ceeb koj yuav tsum tau tsim kev tshaj lij app ntawm Android. Txawm hais tias koj nyuam qhuav pib lossis xav tau cov lus qhia ntxaws ntxiv rau cov lus, Android-App Programmieren hauv Java yuav pab koj tsim thiab nthuav tawm koj thawj kev tshaj lij hauv app. Txawm hais tias koj ua haujlwm nrog ib lub app lossis ib daim ntawv thov mobile uas tau npaj rau ntau tus neeg siv, Android-app-Programming hauv Java yog txoj hauv kev rau koj. Phau ntawv no tseem muaj kev kawm nyob online thiab nkag mus rau ntau dua 200 Kev ntseeg tau tshaj tawm cov neeg koom tes.

Android apps muaj ntau yam sib txawv. Ib qho kev tivthaiv yog lub sharreacteprovider. Cov feem no yuav tso cai rau koj los qhia cov ntsiab lus hauv koj daim ntawv thov. Koj tuaj yeem tsim kho lub shareactivity chav kawm hauv koj lub phiaj xwm hauv, Tom qab ntawd siv SharreageProvider xa cov ntaub ntawv los ntawm ib qho kev ua si mus rau lwm qhov.

Kotlin

Yog koj sim kawm yuav ua li cas program Android apps, koj yuav xav kawm kotlin. Nws yog ib hom lus yooj yim tshaj plaws thiab tau txais kev txhawb nqa los ntawm Android Studio. Yog tias koj tab tom nrhiav txoj hauv kev los tsim cov apps sai dua thiab yooj yim dua, Kotlin yog txoj kev mus.

Kotlin Consiles rau Java bytecode, Yog li koj daim ntawv thov yuav saib thiab xav tias ib yam li Java ib. Nws tau tshaj rau avds, uas txhais tau tias koj tuaj yeem nruab kotlin daim ntawv thov tsis muaj sau dua koj cov ntawv thov uas twb muaj lawm. Yuav pib, Tsuas yog tsim cov ntaub ntawv tshiab kotlin los ntawm kev tswj-txhaj rau koj cov npe npe thiab tom qab ntawv xaiv “Cov haujlwm tshiab Kotlin”.

Tom qab koj tau nruab kotlin, Koj yuav tsum rho tawm Java cov npe. KOTLIN daim ntawv thov yuav khiav ntawm lub statatform ib yam li Java cov ntawv thov. Yog koj tsis paub txog Kotlin, Koj muaj peev xwm rub tawm hauv Android Studio App kawm kom paub yuav ua li cas rau kev pabcuam nws.

Lwm qhov kev xaiv zoo rau Android app Programming yog XML, Markup Cov Lus. Qhov no yog yoog tau dua li Java thiab koj tuaj yeem sau koj app hauv xml, Muab nws rau hauv cov khoom siv, thiab sim nws nyob ib puag ncig. Ntxiv thiab, Android smartphones muaj cov khoom ntim sab hauv rau cov ntaub ntawv thiab cov ntaub ntawv me me.

Lub Hom Phiaj-C

Hom Phiaj-C yog ib hom lus muaj hwj chim tshaj plaws rau hauv. Thaum nws tsis muaj zog npaum li nrawm, Nws yooj yim dua kawm thiab tuaj yeem siv los tsim cov apps sai. Yog tias koj tab tom nrhiav kom paub txog kev cai rau hauv, Koj yuav tsum pib nrog hom phiaj-c. Muaj ntau cov kev kawm online uas yuav pab koj tau pib.

Koj tuaj yeem kawm cov hom phiaj-C los ntawm kev ua raws li ib qho phiaj xwm. Koj tseem tuaj yeem siv hom phiaj-C los tsim koj tus kheej kev ua si. Lub Hom Phiaj-C tau txais kev txhawb nqa los ntawm iPhone thiab Android NDK, Thiab koj tuaj yeem siv nws los ncaj qha hu c code. Koj tseem tuaj yeem nrhiav cov phiaj xwm rau hauv.

Android Muab cov ntawv thov kev nplua nuj thiab API cov tsev qiv ntawv uas ua rau nws yooj yim los tsim cov apps tshiab thiab ua si. Thaum nrawm yog tus pib cov lus, Hom Phiaj-C yog cov lus muaj zog rau Android thiab iOS tsim tawm. Nws tau ua tiav nrawm, kev povhwm, thiab lub xeev txawv txav yog qhov tseem ceeb rau kev tsim cov lag luam thiab cov neeg siv khoom siv. Thaum Swift thiab Hom Phiaj-C yog ob OOP, Nws yog ib qho tseem ceeb kom paub tias qhov twg yuav zoo tshaj plaws koj cov kev xav tau.

Dhau li Swift thiab hom phiaj-C, Apple kuj muaj nrawm. Lub vev xaib xcode txhim kho yuav tsum muab ntsia rau ntawm Mac lossis lub khoos phis tawm los ntawm Apple. MacBooks yog cov khoos phis tawj pom zoo rau kev teeb tsa XCode. Kom tau txais kev nkag mus rau Apple offecter tus account, Koj yuav tsum tau sau npe nrog koj tus e-mail chaw nyob thiab them nyiaj 82 EUR xyoo.

Swift

Muaj ntau txoj kev sib txawv los kawm nrawm rau Android. Ib txoj kev yog los ntawm kev kos npe rau kev kawm online. Qee qhov kev kawm pub dawb yuav muab cov hauv paus ntawm cov lus, Thaum lwm tus yuav tau txais cov ncauj lus ntau dua. Kuj tseem muaj ntau hom kev kawm Kostenpflichtig muaj. Yog tias koj yog ib tus thawj coj, Koj tseem tuaj yeem kawm cov cai hauv Swift.

Seb koj puas xav kawm cov lus rau Android, iOS no, los yog ob leeg, Koj yuav tsum xub nkag siab cov txheej txheem kev sib txawv ntawm cov platform no. Cov kev sib txawv no tau piav qhia hauv cov lus hauv qab no. Thaum nws yuav zoo li nws yuav zoo dua los tsim ob qho app sib txawv kom cater rau txhua lub platform, Qhov no tsis yog ib qho kev xaiv zoo tshaj plaws. Ib txoj kev daws teeb meem yog muab tso rau cov kev ua tiav platform hla, lwm yam paub raws li sau ntawv ib zaug thiab khiav nyob txhua qhov chaw.

Ntxiv rau Swift, Koj tseem tuaj yeem siv lwm hom lus rau kev txhim kho Android. Piv txwv li, koj tuaj yeem siv Java, C++, lossis sej los tsim ib qho hauv app. Ob yam ntawm cov lus no tso cai rau koj los tsim ntau hom sib txawv ntawm cov apps. Koj tuaj yeem kawm paub siv lawv siv cov kev qhia thiab ntau yam khoom siv.

XML kab

XML yog ib qho ntawm feem ntau dav siv tawm tswv yim hauv Android app kev loj hlob. Nws cov txiaj ntsig suav nrog ua platform-ywj siab thiab tus neeg siv-phooj ywg. Hauv tsab xov xwm no, Peb mam li saib xyuas cov qauv zoo nkauj. XML cov ntaub ntawv yog cov ntoo thaiv nrog ntau cov ntsiab lus, los yog hauv paus ntsiab lus. Txhua lub ntsiab tuaj yeem muaj ntau qhov tseem ceeb, lossis hloov pauv.

Txoj hlua yog cov ntaub ntawv-khaws cia ntawm ib xml-zeichenkett, Thiab txhua lub cell hauv cov array muaj ib qho khoom. Cov khoom no yog hu ua kab, Thiab nws muaj cov ntaub ntawv hais txog cov cuab yeej nyiaj txiag. XML-cov hlua yog parsed thiab tso tawm rau tus neeg siv uas siv Dom-Schnittstelle.

XML-Aktiendaten tuaj yeem nyeem nrog cov qauv tshiab tau nyeem tau nyeem. Cov qauv no parses ib xml-hlua thiab rov qab ib txoj hlua-array muaj cov ntaub ntawv nyiaj txiag tsis muaj. Qhov no yog tom qab ntawd dhau mus rau ONPOSTExecute Txuj Ci, uas yog cia li invoked thaum txoj haujlwm asynchronous tiav lawm.

Txoj kev ua neej nyob

Nyob rau hauv lub lifecycle-methode rau hauv app txoj kev kawm, Txhua qhov haujlwm pib thiab kev txiav txim. Android siv cov nyiaj no los tswj cov peev txheej thiab xyuas kom cov ntawv thov teb sai sai rau tus neeg siv thov. Cov apps uas tsis ua raws li ib lub neej feem ntau muab cov neeg siv kev paub tsis zoo thiab siv cov peev txheej tsis tas yuav tsum tsim nyog.

Nyob rau hauv ib qho kev ua si Android, Qhov inpause() Txoj kev hu ua thaum cov haujlwm nres lossis raug txiav. Txoj kev no yog siv los txuag cov ntaub ntawv hauv daim ntawv thov, sau npe mloog, thiab txhais cov UI hloov tshiab. Nws tseem hu ua thaum tus neeg siv nias lub tsev khawm.

LifeCycle-methode yog qhov tseem ceeb ntawm Android app programming. Thaum muaj kev hloov pauv ntawm kev teeb tsa, Cov kev ua haujlwm hauv lub xeev cov kev ua si hloov. Qhov no hloov cov kev ua tau zoo ntawm daim ntawv thov. Yog li ntawd, Android muaj ib qho API mob siab rau khaws cia lub xeev thaum lub sijhawm hloov pauv.

LifeCycle-MenpeDing rau android App Programming tso cai rau koj pib thiab nres ib qho haujlwm. Ib qho kev ua si tau pib los ntawm ib qho kev ua twg tau tso npe rau ntawm lub cuab yeej. Feem ntau cov ntawv thov yuav muaj ib qho haujlwm tshwj xeeb. Thaum lub app tsis nquag, OS Android OS tuaj yeem sim ua kom nws rov qab los ntawm cov haujlwm kawg qhib. Yog tias qhov no tsis tshwm sim, OS tuaj yeem nres cov kev ua ub no thiab rov hais dua nws lub cim xeeb.

Google App Tus Kawg

APP Tus neeg tsim khoom yog lub cuab yeej pom kev uas tso cai rau koj los tsim thiab siv cov ntawv thov Android. Nws yog cov kev pabcuam huab uas koj yuav tsum siv nrog Google Account. Nws yog cov cuab yeej tseem ceeb rau cov neeg tsim khoom lag luam hauv Android. Nws tso cai rau koj los tsim thiab tso ob qho tib si yooj yim thiab cov ntawv thov complex.

APP tus tsim khoom muaj nyob ua tus dawb download rau ob lub khoos phis tawm thiab cov khoom siv txawb. Ib zaug rub tawm, Koj yuav muaj peev xwm kho tau cov software kom haum koj cov kev xav tau. Txhawm rau siv app tus tsim khoom, Qhib lub web browser thiab nyem rau ntawm lub app tsim khawm nyob rau sab qaum-xis. Tom ntej no, Nkag mus rau hauv koj tus Google Account. Hauv app inventor, Koj mam li pom ib nplooj ntawv uas qhia koj cov phiaj xwm.

Google App Tus Kawg tau tsim los ntawm Hal Abelson, Tus kws ua haujlwm software ntawm Google Lab. Nws muaj lub zeem muag ntawm kev ua Android app txoj kev txhim kho yooj yim rau cov neeg siv nruab nrab. Lub hom phiaj yog los tsim ib qho pub dawb, Tus neeg siv-tus neeg siv uas yuav pab Android cov tsim tawm cov apps zoo yam tsis muaj kev pab ntawm cov khoom loj loj.

Lub app tsim graphical cov neeg siv interface cia koj tshawb thiab tsim cov ntawv thov siv cov khoom siv built-thiab cov laj thawj. Tom qab tsim ib lub app, Koj tuaj yeem sim nws ntawm lub tshuab virtual kom pom tias nws ua haujlwm li cas thiab ua li cas nws ua.