Peb npaj koj qhov kev pom! Kev ua tau zoo nrog ONMA scout android app kev txhim kho yog lav.
Hu rau
Koj tuaj yeem ntxiv ntau daim ntawv thov rau koj lub cuab yeej Android. Cov ntawv thov no feem ntau muaj nyob rau hauv app tub rau khoom lossis homepage, thiab lawv txawv nyob ntawm Android version. Cov ntawv thov no yuav cuam tshuam rau koj lub roj teeb lub neej thiab kev ua haujlwm. Koj tuaj yeem nruab daim ntawv thov rau koj lub Android TV ntaus ntawv. Tom qab nruab daim ntawv thov, nws yuav tshwm sim hauv koj lub cuab yeej lub tsev tshuaj ntsuam.
Cov haujlwm yog thawj lub tsev thaiv ntawm Android app. Cov khoom no txhais cov app architecture thiab UI tsim. Android app tsis yog ib qho kev paub dhau los, tab sis cov kev ua ub no uas tus neeg siv tuaj yeem nkag mus thiab tawm ntawm qhov xav tau. Tus tsim UI ib txwm xav txog ib qho app ua ib txheej ntawm cov ntxaij vab tshaus, txhua daim duab qhia rau ib qho haujlwm. Tom qab tus neeg siv ua tiav ib qho haujlwm, lub app launches tus tom ntej.
Cov kev ua ub no pab lub app sib txuas lus nrog lub operating system thiab ua raws li qhov tam sim no ntawm qhov screen. Ntxiv rau, lawv pab kho lub xeev yav dhau los. Feem ntau cov apps muaj ntau yam haujlwm. Txhua yam haujlwm tswj cov ntxaij vab tshaus sib txawv thiab sib txawv hauv qhov nyuaj. Lub neej voj voog ntawm ib qho kev ua si zoo ib yam li lub vev xaib.
Cov haujlwm raug hu los ntawm Android system ntawm thawj kauj ruam ntawm kev ua tiav app. Lub kaw lus hu onStart() thiab onStop() cov txheej txheem ntau zaus thaum lub neej ntawm kev ua haujlwm. Cov txheej txheem no yog qhov tseem ceeb los xyuas kom meej tias lub app muaj kev ruaj khov rau cov neeg siv khoom. Lub kaw lus kuj tseem taug qab thaum twg qhov kev ua si tau xaus thiab yuav tsum tau rov tsim dua. Ib qho kev xyaum zoo yog hu rau onCreate() thaum tsim ib qho kev ua si.
Cov haujlwm yog ib feem tseem ceeb ntawm Android apps. Lawv sawv cev rau lub hauv paus ntawm daim ntawv thov qauv. Cov kev ua ub no tau pib los ntawm Android system los ntawm kev hu xov tooj rov qab txoj hauv kev uas sib haum mus rau ntau theem hauv kev ua ub no. Cov ntaub ntawv hauv Android piav qhia txog lub tswv yim ntawm kev ua ub no thiab muab kev taw qhia hnyav rau kev ua haujlwm nrog lawv. Cov lus hauv qab no qhia txog cov ntsiab lus ntawm ntau hom kev ua ub no thiab lawv cuam tshuam li cas rau cov ntawv thov hauv ntiaj teb tiag. Ntxiv rau, Koj tuaj yeem kawm paub yuav ua li cas ua haujlwm los ntawm kev nyeem phau ntawv qhia tus tsim tawm Android.
Kev ua ub no tau tshaj tawm hauv app qhov kev tshwm sim. Txhawm rau tsim ib qho haujlwm hauv Android app, koj yuav tsum ntxiv tus cwj pwm tshwj xeeb rau qhov manifest. Tus cwj pwm no qhia txog lub npe ntawm chav kawm ua haujlwm txheeb ze rau pob app. Yog koj hloov tus cwj pwm no, lub app yuav tsis ua haujlwm tag nrho.
Views yog cov ntsiab lus tseem ceeb tshaj plaws ntawm cov neeg siv interface ntawm Android app. Lawv muab qhov chaw duab plaub rau cov duab ntawm cov ntawv nyeem thiab lwm cov ntsiab lus graphical thiab tuaj yeem ua ntau yam xwm txheej. Lub Android platform muab ntau yam subclasses rau kev pom, suav nrog TextView, Saib Group, thiab ImageView. Txhua qhov kev pom muaj nws tus kheej cov yam ntxwv, uas txhais tau tias nws yuav coj li cas thiab siv rau hauv daim ntawv thov.
Lub Layout txhais cov qauv ntawm koj daim ntawv thov thiab tuav ntau yam saib. Nws tuaj yeem ua styled los ntawm kev kho nws cov kev txwv. Layouts hauv Android tau teeb tsa siv cov lus XML. Muaj ntau ntau hom layouts. Linear Layout yog siv los ua kom cov khoom nyob rau hauv ib qho linear zam.
Layout qhia txog yuav ua li cas npaj tus me nyuam saib txheeb ze rau ib leeg. Kev txwv layouts yog complex dua li linear layouts, tab sis yog hloov tau yooj yim dua thiab sai dua rau ntau qhov UIs. Kev txwv layouts kuj muab ib tug flatter saib hierarchy, uas txhais tau hais tias kev ua haujlwm tsawg dua ntawm lub sijhawm ua haujlwm. Lawv kuj tau tsim los siv nrog Android Studio tsim editor. Nrog lub layout, cov neeg siv rub thiab tso cov GUI Cheebtsam ntawm cov cuab yeej sau ntawv, thiab tom qab ntawd qhia cov lus qhia yuav ua li cas tso saib lawv.
Hauv Android, txhua yam dej num muaj ntau yam UI uas koom nrog hauv chav saib thiab ViewGroup. Cov ntsiab lus UI no sawv cev rau thaj tsam duab plaub ntawm qhov screen thiab yog lub luag haujlwm rau kev nthuav tawm cov ntsiab lus. Lawv tuaj yeem siv ua ke nrog lwm cov ntsiab lus los tsim ib daim ntawv thov nyuaj dua. Thiab thaum koj txuas ntxiv ua haujlwm nrog Android kev txhim kho ib puag ncig, koj yuav paub ntau ntxiv txog cov hauv paus Android Cheebtsam.
Ib daim ntawv thov Android tuaj yeem muab ntau hom kev pab, nyob ntawm tus ntaus ntawv UI lus thiab layout. Txawm hais tias Android SDK tsis nthuav tawm txoj hauv kev los qhia txog cov peev txheej sib txawv, koj tuaj yeem siv lub vaj huam sib luag teeb tsa los teeb tsa cov peev txheej tsim nyog rau lub cuab yeej koj tab tom tsim rau. Piv txwv li, koj tuaj yeem siv cov peev txheej sib txawv los ua kom zoo dua ntawm qhov chaw muaj nyob, los yog siv txoj hlua sib txawv los txhais cov ntawv hauv tus neeg siv interface.
Lwm cov peev txheej yog cov npe npe rau cov peev txheej qub. Nws yog ib qho tseem ceeb los muab cov peev txheej ua ntej los tiv thaiv koj lub app los ntawm kev poob thaum nws raug siv hauv qhov kev teeb tsa uas tsis tau xav txog. Qhov no tshwm sim thaum tshiab versions ntawm Android ntxiv configuration qualifiers uas laus versions ntawm Android tsis txhawb. Yog tias koj lub app tsis muab cov peev txheej qub, nws yuav ua rau lub cuab yeej tsoo.
Thaum Android apps yuav tsum muab cov peev txheej ua ntej, nws raug pom zoo los muab lwm cov peev txheej rau cov khoom siv tshwj xeeb. Piv txwv li, minSdkVersion 4+ apps tsis tas yuav muaj peev xwm rub tau lub neej ntawd. Ntxiv mus, Android tuaj yeem xaiv qhov zoo tshaj plaws-tshaj lwm cov ntaub ntawv teev npe raws li kev teeb tsa ntawm lub cuab yeej. Ces, nws tuaj yeem ntsuas qhov ntsuas bitmap raws li xav tau.
Yog tias lub kaw lus tsis pom cov peev txheej tsim nyog, nws yuav xaiv cov peev txheej nrog qhov tsim nyog tshaj plaws. Qhov no txhais tau tias koj daim ntawv thov yuav tsum muaj peev xwm lis cov ntxaij vab tshaus me dua li qhov xav tau. Yog li ntawd, Nws yog qhov zoo dua los siv cov peev txheej nrog ob qhov loj me. Txoj kev no, koj tuaj yeem txheeb xyuas koj daim ntawv thov rau cov khoom siv tshwj xeeb thiab kev daws teeb meem ntawm lub vijtsam.
Cov chaw muab cov ntsiab lus xav tau rau cov ntawv thov Android kom nkag mus rau cov ntaub ntawv. Lawv yog lub hauv paus repository rau cov ntaub ntawv thiab muab ib tug interface rau cov ntaub ntawv sib pauv ntawm daim ntaub ntawv. Cov chaw muab cov ntsiab lus tseem tsim nyog rau Android daim ntawv thov xa ntawv. Tus Muab Cov Ntsiab Lus tau sau npe rau hauv cov ntaub ntawv ua haujlwm nrog tus muab kev pabcuam. Mus rau npe rau koj tus neeg muab kev pabcuam, ua raws li cov kauj ruam hauv qab no: * Xaiv qhov tsawg kawg nkaus SDK. * Ntxiv ib daim ntawv qhia cov ntsiab lus rau koj daim ntawv thov.
ContentProviders tuaj yeem nkag mus rau cov ntaub ntawv cov ntaub ntawv uas koj daim ntawv thov xav tau, xws li cov neeg siv phau ntawv txhais lus. Lawv xav tau kev tso cai nyeem thiab sau ntawv. Qhov kev tso cai no tuaj yeem tau txais los ntawm android.permission.readPermission() txoj kev. ContentProviders kuj cuam tshuam nrog tus neeg siv khoom, tuav kev ruaj ntseg, thiab inter-process kev sib txuas lus.
Kev siv cov ntsiab lus feem ntau yog khaws cov ntaub ntawv rau lwm cov ntawv thov. Tus kws kho cov ntsiab lus ua raws li cov ntaub ntawv sib raug zoo thiab tso cai rau koj cov ntawv thov nkag mus rau cov ntaub ntawv ruaj ntseg. Tus neeg muab kev pabcuam tseem tuaj yeem hloov kho cov ntaub ntawv raws li tus neeg siv xav tau. Lub Android system tso cai rau tus neeg muab kev pabcuam los tswj cov ntaub ntawv thov hauv ntau txoj hauv kev, nyob ntawm nws cov kev xav tau.
Cov chaw muab cov ntsiab lus yog ib feem tseem ceeb ntawm kev txhim kho Android. Lub moj khaum muaj lub tsev qiv ntawv muab cov ntsiab lus uas tuaj yeem pab koj tswj cov ntaub ntawv koj muaj ntawm koj lub cuab yeej. Lub tsev qiv ntawv no cia koj centralize koj cov ntaub ntawv nyob rau hauv ib qho chaw. Ib qho piv txwv zoo ntawm qhov no yog kev sib cuag, uas tau muab cia rau hauv daim ntawv thov ContactProvider. Ces, Lwm daim ntawv thov tuaj yeem nkag mus rau lawv siv ContactProvider's interface. Lub interface ntawm ContactProvider suav nrog txoj hauv kev los ntxig, hloov tshiab, rho tawm, thiab nug. Cov chaw muab cov ntsiab lus tseem siv sab hauv los ntawm Android. Bookmarks kuj yog cov ntsiab lus muab rau lub kaw lus. Thaum kawg, tag nrho cov xov xwm hauv qhov system tau sau npe nrog MediaStore cov ntsiab lus.
Tus Muab Cov Ntsiab Lus tuaj yeem teeb tsa kom muaj qhov chaw nyob URI tshwj xeeb. Qhov URI no yog siv los nkag rau cov ntsiab lus. Nws kuj tseem tuaj yeem hais qhia hom ntaub ntawv thiab kev tso cai. Tus Muab Cov Ntsiab Lus kuj tuaj yeem teeb tsa kom tso cai rau cov ntaub ntawv xa tawm.
Qhov kev tso cai rau hauv cov khoom siv hauv Android yog ib feem tseem ceeb ntawm kev tiv thaiv koj lub cuab yeej. Nws tuaj yeem txwv hom apps koj nruab thiab qhov lawv tuaj yeem nkag tau. Koj tseem tuaj yeem siv cov kev tso cai los tiv thaiv koj tus kheej. Ceev faj cov apps uas thov kom nkag mus ntau dhau. Qhov kawg uas koj xav tau yog muab lawv nkag mus rau koj lub xov tooj lub microphone.
Android qhov kev tso cai tso cai categorizes apps raws li lawv qib kev ruaj ntseg. Koj tuaj yeem xaiv ob hom kev tso cai yooj yim: ib txwm tso cai thiab kos npe tso cai. Qhov txawv yog qhov uas ib qho app tuaj yeem ua thiab nkag mus rau sab nraum lub sandbox. Cov apps uas muaj kev tso cai ib txwm ua rau muaj kev pheej hmoo tsawg rau cov neeg siv ntiag tug thiab rau lwm cov apps. Lawv cia li tso cai rau qee qhov, thaum lwm tus neeg apps yuav tsum thov rau lwm tus.
Cov apps uas muaj kev tso cai tsis zoo tuaj yeem soj ntsuam koj cov lus ntiag tug, sau npe rau koj rau cov kev pabcuam uas tsis xav tau, thiab spam koj inbox. Koj tuaj yeem tswj tau qhov kev tso cai twg ib qho app tuaj yeem thov los ntawm koj lub xov tooj los ntawm kev tso cai rau nws nkag mus rau qee qhov chaw cia. Piv txwv li, suab paj nruag apps tuaj yeem nkag mus rau koj daim npav SD kom txuag tau cov nkauj rub tawm, thaum social networking apps tuaj yeem nkag mus rau koj cov neeg. Cov apps tsis zoo yuav nkag mus rau koj qhov chaw thiab koj cov ntaub ntawv kho mob.
Lub Android tso cai system muab txoj hauv kev yooj yim los tswj cov ntaub ntawv uas koj cov apps sau thiab sib qhia. Ua ntej rub tawm ib qho app, koj tuaj yeem tshawb xyuas nws cov kev tso cai hauv Google Play store thiab xaiv qhov twg koj ntseeg. Tsuas yog cov apps uas tsim nyog tso cai tuaj yeem ntseeg tau los ntawm cov neeg siv. Nws yog ib qho tseem ceeb uas koj cov ntaub ntawv nyob twj ywm ntiag tug, yog li xyuas kom koj paub tias koj tso cai rau dab tsi.