Peb npaj koj qhov kev pom! Kev ua tau zoo nrog ONMA scout android app kev txhim kho yog lav.
Hu rau
Ua ntej koj pib sau code, koj yuav tsum paub cov hauv paus ntawm Android apps programmieren. Qhov kev qhia no yuav hais txog cov ncauj lus xws li tsim Zitate-App, Siv Cov Lus Qhia, Tsim ib qho App Bar, thiab Refactoring. Koj tuaj yeem pom cov lus qhia muaj txiaj ntsig yog tias koj twb paub HTML lawm. Txawm li cas los, yog tias koj tseem tsis meej pem txog lub ncauj lus no, tej zaum koj yuav xav xav txog kev txheeb xyuas cov kab lus no hais txog luag-thiab-nco.
Kev xav yog cov lus uas qhia meej txog qhov ua, thiab lawv ua raws li kev sib txuas lus ntawm ntau yam hauv Android. Ib daim ntawv thov Android muaj ntau yam, suav nrog Kev Ua Si, Kev pabcuam, thiab Broadcast Receivers. Lub hom phiaj tso cai rau koj hloov ntawm kev ua ub no, piv txwv, los ntawm kev thov kom ib qho Kev Ua Haujlwm tso lwm qhov. Ib yam li ntawd, ib feem tuaj yeem thov kom lwm tus ua haujlwm, xws li rub tawm cov ntaub ntawv. Txawm li cas los, muaj qee qhov kev ceev faj uas yuav tsum tau ua thaum siv kev xav hauv koj lub app.
Lub hom phiaj yog ib txoj hauv kev yooj yim los qhia rau Android system yuav ua li cas. Lawv tuaj yeem siv los qhia cov xwm txheej tshwm sim hauv daim ntawv thov, xws li thaum tus neeg siv kais ntawm ib lub pob lossis sib koom ib nplooj ntawv web URL. Lawv kuj tuaj yeem siv los tua cov khoom tshwj xeeb. Ib qho piv txwv ntawm qhov no yog ib daim ntawv thov mobile nrog ob txoj haujlwm, kev ua A thiab kev ua B. Ib qho kev mob siab rau kev ua haujlwm tuaj yeem tso tawm haujlwm B los ntawm kev hla URL rau kev ua A.
Kev siv lub hom phiaj rau kev pab cuam Android apps yog kev sib koom tes, thiab nws yog ib qho tseem ceeb kom paub tseeb tias koj siv lawv kom raug. Yog hais tias ib qho khoom ploj lawm, Qhov kev pabcuam Deep Link yuav hu rau Play Store thiab muab daim ntawv thov los ntawm qhov ntawd. Cov txheej txheem yog rov ua dua kom txog thaum qhov kev xav tau ua tiav. Feem ntau, txoj kev no yog qhov yooj yim to taub. Thiab nws yuav tso cai rau koj los tsim cov ntawv thov customized heev. Lub hom phiaj muaj txiaj ntsig zoo hauv kev tsim cov apps sib koom ua ke, vim lawv pab cov neeg tsim tawm kom tau ntau dua ntawm lawv cov app.
Lub hom phiaj yog tshaj tawm cov lus uas Android system mloog. Daim ntawv thov tuaj yeem sau npe rau cov xwm txheej thiab cuam tshuam rau lawv. Lub hom phiaj muaj cov ntaub ntawv header thiab cov ntaub ntawv ntxiv raws li Bundle chav kawm. Koj tuaj yeem khaws cov no los ntawm kev hu rau getExtras() txoj kev. Thiab qhov ntawd yog txhua yam muaj rau nws! Yog li yog tias koj txaus siab los tsim lub mobile app, tshawb xyuas cov lus qhia no thiab pib hnub no!
Tsim ib qho App Bar nrog Android apps muaj kev siv hom tshwj xeeb ntawm cov cim rau kev taw qhia, nrhiav, kev ua, thiab branding. Nws tso cai rau koj lub app sawv tawm ntawm cov neeg sib tw thiab muab cov ntaub ntawv tseem ceeb ntawm koj lub app rau tus neeg siv. Lub app bar pab kom paub meej qhov zoo ib yam thiab hnov ntawm cov apps, ua kom cov haujlwm tseem ceeb yooj yim nrhiav tau, thiab txhawb kev coj cwj pwm zoo ib yam. Tab sis koj pib ua li cas?
Thawj kauj ruam yog los tsim ib qho Kev Ua Si uas yuav muaj lub toolbar. Koj tuaj yeem ntxiv nws rau MainActivity lossis Layout ntawm Kev Ua Haujlwm. Xwb, koj tuaj yeem tsim Toolbar thiab tso rau hauv App Bar. Koj tuaj yeem xaiv qhov chaw ntawm lub toolbar. Txhua yam nyob ntawm koj qhov kev xav tau. Hauv Android, koj tuaj yeem ntxiv Toolbar rau koj qhov Kev Ua Haujlwm lossis MainActivity.
Lub active app bar yog ib feem ntawm Android app, tab sis nws tsis muaj functionality. Lub bar yuav tsum muaj kev nqis tes ua hauv XML ntawv qhia zaub mov, uas tau sau npe hauv onCreateOptionsMenu() txoj kev. Tom qab koj tau tsim ib qho Kev Ua Si, koj tuaj yeem siv cov kev ua los teb rau cov neeg siv tswv yim. Cov kev ua uas tau teev tseg hauv cov ntawv qhia zaub mov yuav tsum tau muab coj los siv rau hauv cov ntsiab lus sib thooj.
Qhov kev txiav txim bar hauv Android apps yog qhov pom pom saum toj kawg nkaus ntawm koj daim ntawv thov. Nws muab cov qauv zoo ib yam rau koj lub app thiab muaj cov ntsiab lus uas koj nquag siv. Google tau tshaj tawm ActionBar hauv Android 3.0 (API 11), thiab nws tau dhau los ua ib feem tseem ceeb ntawm Android ecosystem. Ua ntej, nws tau hu ua AppBar thiab nws tsuas muaj lub npe ntawm koj daim ntawv thov thiab cov haujlwm uas koj tab tom ua tam sim no. Thaum nws nrov, cov ntawv qhia zaub mov kev xaiv tau muab cov kev xaiv customization tsawg heev.
Refactoring daim ntawv thov yog ib txoj hauv kev zoo los ua kom koj cov cai yooj yim los tswj thiab nyeem. Feem ntau, thawj kauj ruam hauv kev sau ib daim ntawv thov yog nrhiav txhua qhov chaw uas yuav tsum tau hloov pauv. Qhov no tuaj yeem txuag tau ntau lub sijhawm thiab nyiaj txiag. Yog tias koj tsis muaj sijhawm ntau lossis tsis muaj peev txheej, koj tuaj yeem xav txog kev tsim lub moj khaum los ua kom koj cov cai tswj tau ntau dua.
Refactoring Android apps ua rau cov cai yooj yim to taub. Cov neeg tsim khoom tuaj yeem yooj yim ntxuav cov txheej txheej ntawm cov lej, thaum tswj tag nrho cov qauv ntawm codebase. Txoj kev no yog qhov zoo tagnrho rau refactoring legacy desktop apps rau hauv daim ntawv thov mobile. Qee qhov chaw qhib Android app kev txhim kho cov haujlwm siv Leafactor toolset. Mus sim nws, xa daim ntawv thov rub mus rau qhov project official. Cov cuab yeej yuav cia li tsim cov lej hloov pauv thiab muab cov ntaub ntawv.
Lwm cov kauj ruam tseem ceeb hauv refactoring Android app yog siv IDE. Dab noj hnub yog ib qho IDE tsim, thiab muaj kev ua haujlwm sib xyaw ua ke thiab kev xaiv refactoring. Cov cuab yeej no yuav pab koj ua kom muaj peev xwm ua haujlwm nyuaj thiab xa koj lub app sai dua. Juno yog qhov zoo ntawm cov ntaub ntawv siv dab noj hnub. Koj tuaj yeem tau txais ib lub tswv yim ntawm cov yam ntxwv ntawm Refactoring yog dab tsi. Ua raws li cov kauj ruam no, koj yuav tuaj yeem txhim kho koj txoj kev txhim kho hauv app.
Txhawm rau refactor Android app, highlight cov code koj xav refactor thiab right-click nws. Xaiv qhov kev xaiv Refactor los ntawm cov ntawv qhia zaub mov. Qhov kev xaiv no muab rau koj ntau hom kev xaiv los xaiv. Ib qho tseem ceeb tshaj plaws yog renaming. Right-clicking ib cov ntaub ntawv thiab xaiv “Hloov npe” yuav hloov lub npe ntawm cov ntaub ntawv ntawd. Tom qab ntawd koj tuaj yeem xaiv qhov tsim nyog refactoring xaiv.
Ib qho Android app bar yog ib feem ntawm ib qho app uas qhia txog ntau yam, xws li toolbar, ib tab layout, thiab ib daim duab saib. Nws tuaj yeem muab tso rau hauv CoordinatorLayout niam txiv los tswj nws tus cwj pwm thaum scrolling. Tus thawj tswj CollapsingToolbarLayout muab ntau theem ntawm kev tswj hwm lub app bar. Ntxiv rau, lub app bar tuaj yeem hloov kho kom muaj xim tom qab thiab lub cim.
Ib txoj hauv kev los ua kom qhov kev txiav txim siab zoo dua yog siv lub cuab yeej widget los ntawm lub tsev qiv ntawv txhawb nqa. Txoj kev no, koj yuav muaj tus cwj pwm zoo ib yam ntawm txhua yam khoom siv Android. Lwm qhov zoo dua yog tias Toolbar widget tuaj yeem muab cov khoom tsim kev paub ntawm Android 2.1, whereas lub hom phiaj bar yuav tsis txhawb cov style kom txog rau thaum Android 5.0. Ntxiv no widget rau koj app, koj yuav tsum siv lub tsev qiv ntawv txhawb nqa v7 appcompat.
Tsim ib qho Android App Bar tuaj yeem yog txoj haujlwm nyuaj rau txawm tias tus tsim tawm tshaj plaws. Muaj ntau lub ntsiab lus los xav txog, los ntawm cov ntawv tiag tiag mus rau qhov pom ntawm cov cim. Thaum nws tseem ceeb heev uas yuav tsum nco ntsoov tias tus qauv tsim yuav tsum ua haujlwm zoo thiab txaus siab rau qhov muag, ib tug bar nrog ib tug cluttered interface yog unattractive. Hmoov zoo, muaj ntau txoj hauv kev los ua kom lub app bar zoo dua yam tsis tau siv rau lub toolbar.
Lwm cov txheej txheem muaj txiaj ntsig zoo rau kev hloov kho app bar yog siv lub ntsiab lus kev cai. Cov ntsiab lus no yuav tsum txuas ntxiv cov ntsiab lus uas twb muaj lawm. Nws kuj tseem yuav teeb tsa lub Android:windowActionBarOverlay cov cuab yeej kom muaj tseeb. Qhov no yuav xyuas kom meej tias lub bar pom thaum scrolling downward. Txoj kev no tso cai rau koj mus nkaum thiab qhia lub bar raws li qhov tshwj xeeb layout. Koj tseem tuaj yeem siv CSS snippets kev cai rau lub ntsiab lus.