Yuav ua li cas Programming Android Apps

Yog tias koj xav paub yuav ua li cas rau program Android apps, muaj ob peb yam uas koj yuav tsum paub. Yog tias koj yog tus tshiab rau daim teb no, nws tsim nyog siv ob peb feeb los nyeem txog qee qhov kev qhia ua ntej. Nyeem rau Java, Kev xav, ShareActionProvider, thiab XML-Parsing Methode.

Java

Programming Android app tsis tas yuav nyuaj – muaj ntau yam cuab yeej uas yuav pab tau koj tsim ib daim ntawv thov sai thiab yooj yim. Ua ntej, koj yuav tsum tau mus download tau qhov tsim nyog coding software. Tom ntej no, nruab Java thiab ib puag ncig kev txhim kho app, xws li Android Studio. Qhov no yuav tso cai rau koj los tsim ib qho app tsis muaj sijhawm. Koj tseem yuav xav txheeb xyuas lub app tus qauv thiab layout. Tom qab no, koj tuaj yeem xaiv qhov tsim interface.

Koj tuaj yeem xaiv cov khoom siv txhim kho Android app. Cov khoom siv no zoo tagnrho rau cov neeg tsim khoom pib thiab tuaj nrog ntau yam kev qhia thiab cov ntaub ntawv siv. Thaum koj tau rub tawm SDK, koj tuaj yeem pib tsim thiab tsim koj thawj Android app. Lub Android SDK yog qhov yuav tsum tau rau cov pib tshiab, thiab muaj ntau yam kev pab dawb hauv online muaj, suav nrog ntau yam kev qhia, ntawv nyeem, thiab video piv txwv. Yog tias koj tshiab rau programming, koj tuaj yeem koom nrog CHIP Forum, qhov twg koj tuaj yeem nug cov lus nug thiab sib pauv cov lus qhia nrog lwm tus kws tshaj lij programmers.

Android Online Kurs muab kev qhia tob tob rau Android app kev txhim kho, npog txhua yam tsim nyog los tsim kom muaj kev tshaj lij app. Tus kws sau ntawv taug kev koj los ntawm txoj kev txhim kho ib ntus, thiab piav qhia txog qhov tseem ceeb tshaj plaws ntawm kev coding a professional Android app. Cov ntawv nyeem kuj qhia koj siv Android Studio thiab ntau lwm yam cuab yeej. Koj tseem yuav kawm paub yuav ua li cas rau program apps nrog ntau lub vijtsam, cov txheej txheem tom qab, thiab ntau ntxiv.

Kev xav

Yog tias koj xav kom koj lub Android apps los teb rau qhov xav tau, Koj tuaj yeem ua rau siv Android lub hom phiaj programmierung moj khaum. Lub hom phiaj tuaj yeem siv los ua kom ua haujlwm thiab xa cov ntaub ntawv mus rau lub server. Lub hom phiaj ntawm Android lub hom phiaj programmierung muaj ntau txoj hauv kev los ua kom tiav qhov no. Ib txoj hauv kev no yog siv Google Maps.

Lub hom phiaj yog lub hauv paus ntawm ntau daim ntawv thov Android. Lawv tso cai rau koj cov apps sib txuas lus nrog lwm cov ntawv thov, cov khoom, thiab cov khoom siv. Lawv kuj tuaj yeem siv los taug qab hauv daim ntawv thov, xws li thaum tus neeg siv tau txais kev them nyiaj txuas hauv lawv cov SMS. Qhov no ua rau nws muaj peev xwm kis tau cov ntaub ntawv los ntawm ib qho app mus rau lwm qhov, txawm los ntawm tib daim ntawv thov.

Lub hom phiaj tso cai rau koj cov apps hauv Android xa cov ntaub ntawv mus rau lwm cov apps, xws li cov ntaub ntawv. Koj tuaj yeem thov kom koj cov apps qhib cov ntaub ntawv los ntawm lwm lub app. Ua li no, koj yuav tsum qhia qhov MIME hom thiab URI qhov chaw. Xwb, koj tuaj yeem thov kom tsim ib daim ntawv tshiab. Tsuav yog cov ntaub ntawv tswj hwm los ntawm lwm lub app, koj cov apps hauv Android tuaj yeem xa cov ntaub ntawv mus rau qhov chaw ntawd. Cov ntaub ntawv raug xa mus rau lub server siv URI.

Lub hom phiaj yog siv hauv Android apps los ua ntau yam haujlwm hauv keeb kwm yav dhau. Lawv muaj txiaj ntsig zoo thaum koj xav pib ua haujlwm ib zaug thiab tsis xav tau cov neeg siv sib cuam tshuam. Lub hom phiaj tuaj yeem raug xa mus rau StartService() txoj kev ntawm koj app. Lub hom phiaj kuj tseem siv tau los xa cov lus rau lwm cov apps. Piv txwv li, Ib Lub Hom Phiaj tuaj yeem siv los qhia rau lwm lub app tias cov ntaub ntawv tau ua tiav rub tawm thiab npaj siv. Lub hom phiaj tseem tuaj yeem siv hauv kev sib koom tes, nrog kev pab los ntawm Broadcast Receivers.

ShareActionProvider

Yog tias koj xav qhia cov ntsiab lus ntawm koj cov apps hauv Android, koj tuaj yeem siv ShareActionProvider. Nws ua haujlwm los ntawm kev tso tawm cov npe ntawm kev sib koom apps ntawm qhov screen. Thaum tus neeg siv nyem rau ntawm lub app icon, tus ShareActionProvider yuav qhib.

Qhov no yog qhov yooj yim tab sis muaj zog widget uas saib xyuas tus cwj pwm thiab qhov zoo rau koj. Txhua yam koj yuav tau ua yog qhia lub npe ntawm lub hom phiaj sib koom. Tus ShareActionProvider yuav khaws cov qeb duas ntawm cov hom phiaj sib koom thiab yuav tso tawm cov phiaj xwm nyiam tshaj plaws hauv app bar.

Cov cuab yeej no yog qhov zoo rau cov pib tshiab rau program Android apps. Nrog cov cuab yeej no, Koj tuaj yeem txuas koj Android app rau kev so Oriented WebService. Qhov no yog qhov tshwj xeeb tshaj yog thaum muaj cov ntaub ntawv tso tawm. Txawb apps tsim tus nqi siab thaum lawv pom cov ntaub ntawv. Txawm li cas los, Cov ntaub ntawv tsis khaws cia rau ntawm lub ntaus ntawv nws tus kheej – fab ntxeev, Nws yog rub tawm los ntawm cov webservic sib txawv thaum lub sijhawm app runtime.

Koj yuav tsum muaj Java kev paub yog tias koj xav tsim cov ntawv thov Android. Koj tuaj yeem rub tawm hauv Studio, Ib puag ncig qhib-los ntawm Google. Muaj ntau cov ntawv thiab cov yeeb yaj kiab online los pab koj kom tau pib. Koj tuaj yeem tuaj koom nrog lub rooj sib tham Chip los sib pauv tswv yim nrog lwm cov neeg tsim khoom.

XML-Parsing Methode

XML-Parsing yog ib qho tseem ceeb ntawm Android apps programming. Nov yog ib txoj haujlwm tshaj tawm vim tias ntau lub vev xaib thiab Blogging Platforms siv cov hom XML rau kev sib qhia cov ntaub ntawv. Android apps yuav tsum paub siv cov ntaub ntawv no hauv lawv daim ntawv thov, thiab txoj kev no yog ib qho zoo. Nws siv cov ntaub ntawv los ntawm cov ntawv nyeem thiab ua tiav nws siv cov khoom-oriented mus kom ze. Muaj peb hom XML parser hauv Android. Feem ntau siv yog XMLPullParser. Nws yog ib qho yooj yim mus use thiab npaum.

Cov qauv app txheeb xyuas cov cim npe xws li lub npe, txuas, thiab cov ntsiab lus. Nws kuj muaj ib txoj kev hu ua hla(). Txoj kev no rho tawm ib lub npe, txuas, thiab cov ntsiab lus los ntawm cov ntaub ntawv XML. Nws tom qab ntawd recursively txheej txheem pub thiab xa rov qab daim ntawv teev npe nkag. Thaum muaj qhov yuam kev tshwm sim thaum parsing, lub app yuav pov ib qho kev zam.

Thawj kauj ruam hauv kev kawm paub siv XML-Parsing Methode hauv Android apps programming yog teeb tsa koj ib puag ncig. Android Studio yog qhov yuav tsum tau ua rau kev khiav cov lej piv txwv. Koj tsis tas yuav siv qhov tseeb version ntawm Android SDK API. Basic XML thiab JSON Parsing tau muaj txij li thaum ntxov ntawm Android.

XML cov ntaub ntawv

Koj twb tau hnov ​​cov lus ntawm XML-daten, Thiab koj yuav xav kawm txog kev pab cuam nrog lawv ua kom koj cov ntawv thov hauv Android ntau dua li nthuav. XML yog cov lus markup uas feem ntau siv rau cov ntaub ntawv pauv ntawm cov khoos phis tawm thiab cov ntawv thov, xws li nyob rau hauv cov vev xaib. Koj cov ntawv thov Android yuav muaj peev xwm nyeem thiab sau cov ntaub ntawv no nyob rau hauv daim ntawv ntawm XML-txoj hlua, uas yuav tsum tau txheeb xyuas kom tau txhais.

XML-daten yog lub hauv paus ntawm XML-based programming, thiab lawv tau siv ntau lub hom phiaj sib txawv. Cov lus muaj qhov kev kawm tsawg heev thiab yog qhov yooj yim siv rau ntau cov ntawv thov. Nws tseem yog qhov yooj yim sib to taub, thiab koj tuaj yeem nrhiav ntau yam piv txwv online. Koj tuaj yeem rub tawm XML cov ntaub ntawv thiab qhib lawv hauv cov ntawv sau rau hauv.

Koj tuaj yeem nyeem XML-daten rau Android apps los ntawm kev txhais koj app lub pob ntim khoom thiab pib. Koj tseem tuaj yeem txhais cov kev ua ub no ntau yam thiab cov ntsiab lus ntawm koj app.

Haiv neeg Apps Vs Progressive Web Apps

Muaj ntau cov txiaj ntsig rau kev tsim tsa PWA hloov ib txwm app rau Android. Rau ib yam, Pwas tuaj yeem ua tau tsis kim dua li cov apps. Kuj, Pwas tuaj yeem ua tau cov khoom siv thoob plaws. Thaum cov txiv neej cov apps yuav tsum tau customized kom haum sib txawv screen ntau thiab tsawg, Pwas tau tsim los ua haujlwm rau txhua lub cuab yeej.

Thaum cov ntawv thov cov neeg muaj nqi ntau dua los txhim kho, Txhim zog web apps tau nrawm dua. Cov ntawv thov siv HTML, CSS, thiab JavaScript los tsim daim ntawv thov. Txawm li cas los, Lawv muaj kev ua haujlwm tsawg, xws li qhov tsis muaj peev xwm nkag tau daim qhia hnub hli, kev sib cuag, Browser Bookmarks, thiab bluetooth.

Dua li no cov teeb meem no, Txhim zog web apps tuaj yeem siv tau cov khoom siv cuab yeej. Tsis zoo li ib txwm apps, Txhim zog web apps tuaj yeem nkag tau tag nrho cov khoom siv ntaus, suav nrog lub koob yees duab, lub koob qhia kev, thiab npe hu. Cov xwm txheej no tuaj yeem pab koj txiav txim siab uas siv thiab seb nws puas tsim nyog rau koj los nqis peev hauv kev txhim kho.

Txhim kho lub vev xaib muaj peev xwm xa thiab tau txais cov ntawv qhia laub thiab ua haujlwm offline. Ntxiv rau, Lawv tuaj yeem tsim tau ntawm cov haujlwm ua haujlwm. Cov vev xaib no yog qhov zoo tshaj rau kev xa cov ntsiab lus rau cov neeg siv khoom txawb.

Tsim Kev Tsim Ib Lub Phiaj Xwm Hauv Studio

Txhawm rau tsim ib qho Android app, Koj tuaj yeem siv Android Studio. Koj tuaj yeem siv cov qauv ua ntej tsim los pib. Ces, koj tuaj yeem xaiv hom ntaus ntawv koj xav tau hom phiaj. Koj tuaj yeem xaiv qhov tsawg kawg nkaus SDK yuav tsum tau tsim koj lub app. Koj yuav tau ntxiv qee cov ntaub ntawv rau qhov project.

Cov phiaj xwm hauv Android muaj cov folders thiab cov ntaub ntawv sib txawv rau lub hom phiaj sib txawv. Ntxiv nrog rau qhov muaj qhov chaws rau koj daim ntawv thov, lawv kuj muaj cov tsev qiv ntawv. Lub libs folder tuav cov ntaub ntawv ntim ntxiv uas xav tau los ntawm lub sijhawm ua haujlwm ntawm daim ntawv thov. Cov cuab tam folder muaj cov khoom muaj nqis thiab cov ntaub ntawv zoo li qub. Thaum kawg, lub gen / nplaub tshev muaj qhov chaws tsim los ntawm Android cov cuab yeej tsim.

Koj tuaj yeem tsim daim ntawv thov Android siv Java thiab XML. Ntxiv rau qhov no, Koj tuaj yeem siv PHP thiab SQL los tsim ib qho backend thiab tswj cov ntaub ntawv. Txhawm rau tsim koj lub app, Koj yuav xav tau Android Studio. Thaum koj tau ua qhov no, koj tuaj yeem siv Java, XML, lossis JSON los tsim cov qauv ua ntej ntawm koj daim ntawv thov.

SRC Folder muaj Java cov ntaub ntawv. Lub lib nplaub tshev muaj cov ntaub ntawv ntxiv uas siv los ntawm Android. Tus Recder tuav tuav sab nraud cov peev txheej rau koj daim ntawv thov, xws li cov duab, Layout XML cov ntaub ntawv, thiab audio files. Ntxiv mus, Mipmap Folder yog qhov chaw koj yuav tso koj lub app app. Ib yam li ntawd, Koj yuav tsum muab lwm cov khoom siv tiv thaiv kom haum rau hauv lawv cov ntawv sau.