Peb npaj koj qhov kev pom! Kev ua tau zoo nrog ONMA scout android app kev txhim kho yog lav.
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Android yog ib qho ntawm cov kev ua haujlwm xov tooj ntawm tes ua haujlwm tshaj plaws niaj hnub no. Nws muaj kev lag luam sib koom 75 feem pua thiab siv los ntawm ntau tshaj 2 billion tus neeg thoob ntiaj teb. Yog tias koj xav paub txog kev kawm ntxiv txog cov kab ke, Muaj ntau cov peev txheej muaj. Ib qho ntawm cov peev txheej yog hauv Android SDK. Koj tseem tuaj yeem kawm paub ntau ntxiv txog Kotlin thiab Java.
Thaum koj tsim kho ib daim ntawv thov rau hauv lub tshuab hauv, Koj yuav tsum tau paub txog nws lub platform architecture. Qhov no yog hais txog tus naj npawb ntawm cov txheej txheem uas coj mus tshwm thaum koj pib koj daim ntawv thov, Raws li kev sib txuas lus ntawm cov ntawv thov. Tsis tas li ntawd, Koj yuav tsum tau paub nrog cov khoom sib txawv ntawm Android, suav nrog kev ua si, Yam tawg, Kev pab, thiab kev xav. Ntxiv rau, Koj yuav tsum paub cov ncauj lus tshiab tshiab thiab ua raws cov qauv tshiab tshaj plaws hauv kev txhim kho Android apps.
Hauv hauv SDK muaj ntau yam ntawm cov cuab yeej kev txhim kho thiab cov tsev qiv ntawv uas tso cai rau koj tsim thiab tso cov apps. Koj yuav tsum muaj kev paub ua haujlwm ntawm cov cuab yeej no thiab hloov kho lawv thaum Google Tshaj Tawm Tshiab. Txoj kev no, Koj tuaj yeem tau txais ntau tshaj tawm ntawm cov ntsiab lus tseeb thiab txhim kho koj cov kev ua haujlwm app.
Yog tias koj tab tom nrhiav cov lus tshiab rau koj Android app kev loj hlob, Koj yuav xav kuaj tawm kotlin. Nws yog Java-zoo li lus nrog ntau yam zoo, Thiab nws tuaj yeem siv rau ntau txoj haujlwm sib txawv. Nws tseem muaj cov txiaj ntsig ntawm kev ua tau los hloov mus rau hauv java-bytecode, uas yog ib qho zoo tshaj plaws rau cov pib tshiab.
Thaum Kotlin yog nrov, koj yuav muaj lub sijhawm nyuaj nrhiav cov peev txheej ntawm kev kawm nws yog tias koj tshiab rau nws. Hmoov zoo, Muaj qee cov kev pab online uas yuav muab cov ntaub ntawv yooj yim uas koj yuav tsum tau pib. Kotlin muaj cov koom haum me, uas tuaj yeem muab cov lus teb rau cov lus nug txog cov lus. Kotlin kuj tseem sai dua li Java, uas txhais tau tias nws tuaj yeem siv tau ntau dua.
Java, los ntawm qhov sib txawv, yuav tsum tau txo cov kev zam, uas tuaj yeem ua rau cov cai ntev. Cov ntawd tsuas yog ob peb yam uas koj xav paub txog ua ntej dhia rau hauv lub ntiaj teb ntawm java.
Thaum koj tsim muaj Android application, Koj yuav tsum paub tseeb tias xaiv cov lus zoo. Yog tias koj tshiab rau lub cajmeem rau Android, Koj yuav tsum pib nrog java. Koj tuaj yeem siv Java los tsim ob qho tib si haiv neeg thiab hybrid apps. Muaj ntau ntawm cov piv txwv thiab cov peev txheej muaj los koj tau pib. Cov hauv qab no yog qee cov txiaj ntsig ntawm Java rau Kev Tsim Kho Android.
Java txhawb nqa java ib txwm interface (Ntau hnub) uas txhais tau txoj kev ntawm Java thiab Android los ntawm kev sib cuam tshuam nrog txhua lwm yam. Nws tseem muaj peev xwm sau hauv Android tswj tus lej hauv java lossis kotlin. KOTLIN yog ib hom lus uas muab tso rau los ntawm tib txoj kev raws li java.
Thaum txhim kho ib daim ntawv thov Android, Koj yuav tsum ua raws li cov kev tsim tawm hauv android. Nws muab cov ntsiab lus ntawm lub ntsiab nta ntawm Java programming lus thiab muab cov piv txwv ntawm yuav ua haujlwm li cas. Cov lus qhia no tseem tseem npog cov teeb meem kev ua tau zoo thiab cov cuab yeej muaj ntau los ua kom zoo rau koj cov apps.
Dagger Android Kev Kawm Txuj Ci yog lub moj khaum tshiab rau kev siv cov ntawv thov Android. Nws muab kev txhaj tshuaj dawb huv, uas pab cov neeg tsim khoom sau hauv Android code nrog tsawg dua kev ua yuam kev thiab nrog kev txhim kho ntev ntev. Lub moj khaum yog tsim rau software kws kos duab, thiab nws cov kev sib tham sib qhia kev kawm cia koj pom thiab paub txog kev ua neej nyob.
Raws li tus tsim tawm Android, koj xav tau lub moj khaum uas tuaj yeem ua kom muaj kev nyuaj ntawm lub lag luam txawb. Piv txwv li, Ntau lub xov tooj ntawm tes thiab cov ntsiav tshuaj siv Android-based software, uas txhais tau tias koj yuav tsum muaj lub moj khaum uas tuaj yeem cuam tshuam nrog cov qauv sib txawv thiab cov vijtsam ntau thiab tsawg. Dagger yog txoj cai xaiv rau qhov no, Raws li nws muab tag nrho traceeability, thiab yog qhov zoo tagnrho rau kev txhim kho Android.
Dagger siv proguard bytecode Generator rau post-txheej txheem java code. Qhov no ua rau nws yuav emit lub qhov ntuj ci. Nws kuj ua kom ntseeg tau tias Java tau muaj ntau nrog kev ua siab loj.
Yog tias koj yog tus tsim tawm Android, Koj tuaj yeem xav siv cov kev pab cuam qhov chaw APIS kom taug qab qhov chaw ntawm koj cov neeg siv app. Cov Kev Pab Cuam Haujlwm Qhov Chaw Nyob APIs tso cai rau koj los tsim qhov chaw-paub apps nrog yooj yim. Koj tuaj yeem siv cov API ntxiv ntxiv nta xws li Geofencing thiab kev ua si lees paub rau koj cov ntawv thov. APIS rov qab cov ntaub ntawv ntau yam suav nrog kev kwv yees nyob deb, hov ceev, thiab qhov tseeb ntawm qhov chaw nyob.
Qhov chaw pab cuam tshuam cov haujlwm APIS rau android muaj los ntawm cov chaw tsim hluav taws xob thiab cov kev pab tsim cov apps txawb ntau dua. Seb koj ua ib qho app rau Android lossis iOS, Cov thev naus laus zis tshiab no ua rau nws yooj yim dua los tsim cov khoom lag luam zoo sai. Cov APIs feem ntau hu ua “Beacon-thav ntawv” thiab lawv ua haujlwm nyob rau hauv 6.0 thiab tom qab, Qhov rai 10, Linux 3.18, Thiab iOS no. Lawv tuaj yeem tsim kho kom teb rau lub cimceeb tshiab.
Thaum lub sij hawm cov kev pabcuam raws li qhov chaw nyob yuav zoo li yooj yim thiab muaj txiaj ntsig, Lawv kuj tseem tuaj yeem ua rau muaj kev txhawj xeeb rau kev tsis pub lwm tus paub. Hmoov zoo, Muaj ntau txoj hauv kev los xaiv tawm ntawm kev taug qab. Piv txwv li, Cisco muaj kev xaiv tawm rau cov neeg siv uas tsis xav tau taug qab.
Thaum tsim cov apps hauv Android, Koj tuaj yeem siv OpenGL API los tsim 3D duab. Cov cuab yeej thev naus laus zis no tau txais kev txhawb nqa hauv Android los ntawm OpenGL ES API, uas yog ib qho tsw ntawm OpenGL specification uas yog tsim rau cov khoom siv. Qhov API no zoo ib yam li J2ME OpenGL ES API, Txawm hais tias lawv tsis zoo li qub. Yog tias koj npaj yuav siv OpenGL es hauv koj hauv app, Nov yog qee yam koj yuav tsum paub txog cov thev naus laus zis.
Ntxiv rau muab 3D cov duab, Android kuj muab kev txhawb nqa rau 2D duab siv OpenGL. Qhov no vartiant ntawm openGL yog tsim tshwj xeeb rau cov tshuab ua kom haum thiab yog kev txhawb nqa hauv Android 1.0 thiab 2.2. Txij thaum OpenGL es 2.0 yog txhawb nqa los ntawm feem ntau hauv cov khoom siv hauv, Koj yuav tsum siv cov version ntawm API hauv koj cov ntawv thov.
Cov kev txhim kho reactivex / Rxandroid kev loj hlob yog tsim los ua kom yooj yim dua rau cov neeg tsim khoom los tsim cov ntawv thov nrog kev ua haujlwm siab. Lub tsev qiv ntawv tseem muab cov cuab yeej los tswj hwm thiab coj asynchronous cov ntaub ntawv ntws. Thaum cov lus yog qhov nyuaj heev, Nws yog ib qho yooj yim kawm thiab nco ntsoov. Ntxiv rau, Cov tsev qiv ntawv tau sib xws nrog ntau lub platform, suav nrog java thiab Android.
ResiveX / Rxandroid txoj kev loj hlob tuaj yeem ua rau hauv kev sib koom ua ke ib puag ncig xws li Android Studio, uas muaj cov cuab yeej ntsuas thiab cov debugger. Txawm li cas los, Ntau cov ntawv thov Android tuaj yeem ua tau zoo heev, Koom Tes Ntau Cov Neeg Siv Kev Sib Tham thiab Kev Sib Txuas Sib Txuas. Raws li qhov tshwm sim, Tus lej tuaj yeem tau txais ntev heev thiab yuav ua txhaum. ReactiveX yog lwm txoj hauv kev los daws cov teeb meem no. Nrog lub moj khaum no, Cov tsim tawm tuaj yeem tsim cov haujlwm asynchronous thaum siv cov qauv tsim qauv.
ReactiveX ua hauj lwm yooj yim rau cov kev pab cuam los ntawm kev siv cov neeg ua haujlwm uas txo txoj kev nyuaj rau cov kab me me. Kev sim tsoos / txhom yog tsis muaj txiaj ntsig rau Asynchronous suav, Tab sis reactiveX tseem muab cov tshuab rau kev tuav yuam kev. Tsis tas li ntawd, Cov lus pom zoo thiab cov sijhawm npaj paub txog cov nyom ntawm cov pwm, hoob loj, thiab cov qib qis.
Location-based services are becoming increasingly popular for mobile applications, as they offer many benefits and useful use cases. Txawm li cas los xij, there are also risks associated with using location-based services. Piv txwv li, some users may be uncomfortable with applications tracking them without their consent. To address these risks, developers should implement a permission-based approach to location-based service architecture.
A location-based service is a type of mobile application that uses geo-location data to provide personalized services. The application can use this data to display relevant information or find nearby services, such as cab drivers. To be able to utilize location-based services, an android developer must understand how they work and implement them in their apps.
In order to implement location-based services, developers need to consider a variety of technologies. While GPS is an excellent solution for many outdoor scenarios, its accuracy is limited. Inside buildings, piv txwv, it cannot pinpoint a user’s position. Other technologies exist that offer some level of location accuracy, but still have many limitations.
Android uses a secure architecture to protect its users and its ecosystem. It starts with the kernel, and extends to native code and operating system applications. The software that runs above the kernel is called the Application Sandbox. All applications that run within the Application Sandbox are protected by a set of rules. Some platforms restrict developers to certain frameworks, APIs, and languages, but Android does not enforce any restrictions. Ntxiv mus, Code haiv neeg yog kev nyab xeeb raws li txhais cov code.
Android kev ruaj ntseg architecture tiv thaiv lub cuab yeej los ntawm cov ntawv thov uas ua kev ua haujlwm tsis raug. Ntawm lwm yam, Cov ntawv thov raug txwv los ntawm kev nyeem cov ntaub ntawv los ntawm cov neeg siv lossis sau cov ntaub ntawv ntawm lub cuab yeej. Lawv kuj nkag tsis tau lub network tsis muaj tus neeg siv kev tso cai.