{"id":3678,"date":"2022-08-19T14:20:32","date_gmt":"2022-08-19T12:20:32","guid":{"rendered":"https:\/\/visionslabs.io\/prepisanie-celej-mobilnej-aplikacie-na-android\/"},"modified":"2022-08-19T14:20:34","modified_gmt":"2022-08-19T12:20:34","slug":"prepisanie-celej-mobilnej-aplikacie-na-android","status":"publish","type":"post","link":"https:\/\/visionslabs.io\/sk\/prepisanie-celej-mobilnej-aplikacie-na-android\/","title":{"rendered":"Prep\u00edsanie celej mobilnej aplik\u00e1cie na Android"},"content":{"rendered":"\n

Ned\u00e1vno sme vydali nov\u00fa verziu (2.4.0<\/em>) na\u0161ej popul\u00e1rnej mobilnej aplik\u00e1cie na Android – Moja hodinovka<\/strong><\/a>. \u010co je mobiln\u00e1 aplik\u00e1cia, ktor\u00e1 v\u00e1m pom\u00e1ha so z\u00e1pisom va\u0161ej doch\u00e1dzky. A preto\u017ee sa jedn\u00e1 o pr\u00edpad, kedy sme cel\u00fa mobiln\u00fa aplik\u00e1ciu prep\u00edsali do novej \u0161trukt\u00fary a aj nov\u00e9ho jazyka, tak sa s vami chceme podeli\u0165 o zauj\u00edmav\u00e9 postrehy. Len aby bolo jasn\u00e9, tak porovn\u00e1vame verzie aplik\u00e1cie, ktor\u00e9 s\u00fa z 99% rovnak\u00e9 z h\u013eadiska funk\u010dnosti, tak\u017ee sa jedn\u00e1 o ide\u00e1lny pr\u00edpad na porovnanie.<\/p>\n\n

P\u00f4vodn\u00e1 aplik\u00e1cia<\/h2>\n
\n
\"Android
Android Jetpack <\/a>zdroj: https:\/\/developer.android.com\/jetpack<\/figcaption><\/figure>\n<\/div>\n

Moja hodinovka<\/strong> bola p\u00f4vodne p\u00edsan\u00e1 ako aplik\u00e1cia pre n\u00e1\u0161 bl\u00edzky okruh pou\u017e\u00edvate\u013eov a neuva\u017eovalo sa, \u017ee by ju pou\u017e\u00edvalo tis\u00edce pou\u017e\u00edvate\u013eov tak, ako je to dnes. Tak\u017ee jej \u0161trukt\u00fara bola najjednoduch\u0161ia mo\u017en\u00e1<\/strong> a neboli pou\u017eit\u00e9 \u017eiadne architekt\u00fary pre v\u00e4\u010d\u0161ie \u010di dlh\u0161ie udr\u017eiavan\u00e9 aplik\u00e1cie. Aj jazyk aplik\u00e1cie bol v tom \u010dase jedin\u00fd a to Java<\/strong>. A toto si v\u0161etko niesla aplik\u00e1cia od roku 2019, kedy vznikla. Postupom \u010dasu Google predstavoval nov\u00e9 mo\u017enosti pre v\u00fdvoj na Android a to ako nov\u00fd jazyk Kotlin<\/strong> alebo nov\u00e9 bali\u010dky ako napr\u00edklad Android Jetpack<\/strong>.<\/p>\n\n

Nov\u00e1 aplik\u00e1cia<\/h2>\n\n

Tak\u017ee pre tento rok sme sa rozhodli cel\u00fa aplik\u00e1ciu prep\u00edsa\u0165 ako do nov\u00e9ho jazyka Kotlin, tak pomocou v\u0161etk\u00fdch odpor\u00fa\u010dan\u00fdch postupov a kni\u017en\u00edc, ktor\u00e9 aktu\u00e1lne Google odpor\u00fa\u010da. Ako „hlavn\u00fd“ bal\u00edk odpor\u00fa\u010dan\u00ed od Google je Android Jetpack<\/strong> – \u010do je napr\u00edklad pou\u017eitie architekt\u00fary M-V-VM<\/strong> alias Model – View – ViewModel<\/em> – alebo rozdelenie aplik\u00e1cia na \u010das\u0165, ktor\u00e1 sa t\u00fdka d\u00e1t (model<\/em>), potom grafick\u00e9 \u010dasti – niekedy tie\u017e ako UI (view<\/em>) a potom ViewModel<\/em> ako spojovac\u00ed prvok , ktor\u00fd uchov\u00e1va d\u00e1ta pre View a pracuje s d\u00e1tami z \u010dasti Model. \u010eal\u0161ia \u010das\u0165 z odpor\u00fa\u010dan\u00e9ho bal\u00ed\u010dka bol Hilt<\/strong>, \u010do je Dependency Injection<\/em> a nasledovn\u00edk Daggeru<\/strong>. Hilt ve\u013emi dobre funguje v kombin\u00e1cii s MVVM<\/strong> a taktie\u017e generuje k\u00f3d, ktor\u00fd by si inak musel developer s\u00e1m nap\u00edsa\u0165, tak\u017ee ve\u013emi pr\u00edjemn\u00e9 zjednodu\u0161enie pr\u00e1ce pri tvorbe mobilnej aplik\u00e1cie na Android. Potom u\u017e len skratkovito \u010fal\u0161ie odpor\u00fa\u010dan\u00e9 „kni\u017enice“ ako Room<\/strong> pre DB, LiveData<\/strong>, ViewBinding<\/strong> a at\u010f. V\u0161etky inform\u00e1cie o Android Jetpack n\u00e1jdete na ofici\u00e1lnych str\u00e1nkach https:\/\/developer.android.com\/jetpack<\/a>.<\/p>\n\n

Ako teraz porovna\u0165 mobiln\u00e9 aplik\u00e1cie?<\/h2>\n\n

Mohli by sme urobi\u0165 asi „primit\u00edvne“ s\u010d\u00edtanie s\u00faborov a riadkov k\u00f3du, ale to by asi nebolo \u00faplne to prav\u00e9, aj ke\u010f svoju hodnotu to tie\u017e m\u00e1. Ale h\u013eadali sme „lep\u0161\u00ed“ sp\u00f4sob, ako porovna\u0165 star\u00fa a nov\u00fa mobiln\u00fa aplik\u00e1ciu. Na\u0161li sme projekt SCC<\/strong> (Succinct Code Counter<\/em><\/code>), ktor\u00fd dok\u00e1\u017ee vytiahnu\u0165 r\u00f4zne \u0161tatistiky z k\u00f3du a to ako u\u017e spom\u00ednan\u00e9 spo\u010d\u00edtanie riadkov a s\u00faborov, tak aj aj nejak\u00fa komplexitu k\u00f3du alebo jeho n\u00e1ro\u010dnos\u0165. Viac o projekte na https:\/\/github.com\/boyter\/scc<\/a>.<\/p>\n\n

Na obr\u00e1zku ni\u017e\u0161ie m\u00f4\u017eeme vidie\u0165 jednotliv\u00e9 \u0161tatistiky, ktor\u00e9 n\u00e1m n\u00e1stroj SCC pon\u00faka a v\u017edy vyobraz\u00ed ak\u00fa hodnotu z\u00edskala star\u00e1 aplik\u00e1cia (Old<\/em>) a ko\u013eko nov\u00e1 (New<\/em>).<\/p>\n

\n
\"Moja<\/a>
Porovnanie aplik\u00e1ci\u00ed pomocou n\u00e1stroja SCC<\/figcaption><\/figure>\n<\/div>\n

V\u017edy sa porovn\u00e1vaj\u00fa jednotliv\u00e9 typy s\u00faborov, tak\u017ee XML<\/strong>, Java<\/strong> a Kotl\u00edn<\/strong> vzl\u00e1\u0161\u0165. Hlavn\u00fd rozdiel je medzi Javou a Kotlinom<\/strong>, kde vid\u00edme, \u017ee je v podstate vo v\u0161etk\u00fdch parametroch „lep\u0161\u00ed“ Kotlin. Tzn. \u017ee Kotlin je ako \u00faspornej\u0161\u00ed na po\u010det riadkov, tak aj na jeho komplexitu. \u010co potom m\u00e1 za n\u00e1sledok, \u017ee n\u00e1stroj sa pomocou met\u00f3dy COCOMO<\/strong> (Constructive Cost Model<\/em> viac o met\u00f3de napr. na wiki – https:\/\/en.wikipedia.org\/wiki\/COCOMO<\/a> ) sna\u017e\u00ed odhadn\u00fa\u0165 pr\u00e1cnos\u0165 projektu a to ako z h\u013eadiska \u010dasu (ako dlho by trvalo dan\u00fd k\u00f3d nap\u00edsa\u0165), tak aj napr\u00edklad ko\u013eko by mohol st\u00e1\u0165. Nechajme bokom konkr\u00e9tne hodnoty, ktor\u00e9 m\u00f4\u017eu by\u0165 rozporupln\u00e9, ale sk\u00f4r relat\u00edvne hodnotenie. Tzn. \u017ee z h\u013eadiska n\u00e1kladu by nap\u00edsa\u0165 nov\u00fa aplik\u00e1ciu bolo lacnej\u0161ie o 20%<\/strong> ao cca 10% r\u00fdchlej\u0161ie<\/strong>. A t\u00fdm, \u017ee vieme, \u017ee sa z h\u013eadiska funkcie jedn\u00e1 o toto\u017en\u00e9 aplik\u00e1cie, vych\u00e1dza \u017ee pou\u017eitie modern\u00fdch postupov a jazykov je mo\u017en\u00e9 p\u00edsa\u0165 mobiln\u00e9 aplik\u00e1cie lacnej\u0161ie a r\u00fdchlej\u0161ie<\/strong>.<\/p>\n\n

Pokia\u013e by ste chceli vyvin\u00fa\u0165 mobiln\u00fa aplik\u00e1ciu na android, tak nev\u00e1hajte a nap\u00ed\u0161te n\u00e1m napr. na e-mail hello@visionslabs.io<\/a> a spolo\u010dne u\u017e nie\u010do vymysl\u00edme.<\/p>\n","protected":false},"excerpt":{"rendered":"

Ned\u00e1vno sme vydali nov\u00fa verziu (2.4.0) na\u0161ej popul\u00e1rnej mobilnej aplik\u00e1cie na Android – Moja hodinovka. \u010co je mobiln\u00e1 aplik\u00e1cia, ktor\u00e1 v\u00e1m pom\u00e1ha so z\u00e1pisom va\u0161ej doch\u00e1dzky. A preto\u017ee sa jedn\u00e1 o pr\u00edpad, kedy sme cel\u00fa mobiln\u00fa aplik\u00e1ciu prep\u00edsali do novej \u0161trukt\u00fary a aj nov\u00e9ho jazyka, tak sa s vami chceme podeli\u0165 o zauj\u00edmav\u00e9 postrehy. Len aby…<\/p>\n","protected":false},"author":1,"featured_media":3677,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[327,149,193],"tags":[369,451,372,455,452,450,456,218,453,454,457],"class_list":["post-3678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mobilna-aplikacia","category-nezaradene","category-zaujimavosti","tag-android-sk","tag-android-jetpack-sk","tag-google-sk","tag-hilt-sk","tag-java-sk","tag-kotlin-sk","tag-livedata-sk","tag-moje-hodinovka-sk","tag-mvvm-sk","tag-room-sk","tag-scc-sk"],"yoast_head":"\nPrep\u00edsanie celej mobilnej aplik\u00e1cie na Android - visionslabs<\/title>\n<meta name=\"description\" content=\"\u010cl\u00e1nok o tom, ako sme prep\u00edsali Moju hodinovku a zmerali rozdiel. Nov\u00e9 modern\u00e9 postupy dok\u00e1\u017eu u\u0161etri\u0165 a\u017e 20% n\u00e1kladov a cca 10% \u010dasu.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/visionslabs.io\/sk\/prepisanie-celej-mobilnej-aplikacie-na-android\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Prep\u00edsanie celej mobilnej aplik\u00e1cie na Android - visionslabs\" \/>\n<meta property=\"og:description\" content=\"\u010cl\u00e1nok o tom, ako sme prep\u00edsali Moju hodinovku a zmerali rozdiel. 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