{"id":31843,"date":"2019-10-31T21:43:27","date_gmt":"2019-10-31T18:43:27","guid":{"rendered":"https:\/\/prohoster.info\/blog\/sozdanie-kalkulyatora-chaevyh-na-kotlin-kak-eto-rabotaet\/"},"modified":"2019-10-31T21:43:27","modified_gmt":"2019-10-31T18:43:27","slug":"sozdanie-kalkulyatora-chaevyh-na-kotlin-kak-eto-rabotaet","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/sozdanie-kalkulyatora-chaevyh-na-kotlin-kak-eto-rabotaet","title":{"rendered":"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/faaae0beaf023f1c11bb9102312fe429.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\nOpowiadamy, jak stworzy\u0107 prost\u0105 aplikacj\u0119 do obliczania napiwk\u00f3w w j\u0119zyku Kotlin. Dok\u0142adniej m\u00f3wi\u0105c, Kotlin 1.3.21, Android 4, Android Studio 3. Artyku\u0142 b\u0119dzie interesuj\u0105cy przede wszystkim dla tych, kt\u00f3rzy zaczynaj\u0105 swoj\u0105 przygod\u0119 z tworzeniem aplikacji na Androida. Pozwala zrozumie\u0107, jak dzia\u0142a aplikacja wewn\u0119trznie. <\/p>\n<p>Taki kalkulator przyda si\u0119, gdy trzeba obliczy\u0107 sum\u0119 napiwk\u00f3w dla grupy, kt\u00f3ra postanowi\u0142a sp\u0119dzi\u0107 czas w restauracji lub kawiarni. Oczywi\u015bcie, nie wszyscy zawsze zostawiaj\u0105 napiwki kelnerom, to bardziej zachodnia tradycja, ale proces tworzenia takiej aplikacji w ka\u017cdym przypadku jest interesuj\u0105cy. <br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<blockquote><p><b>Przypominamy:<\/b> <i>dla wszystkich czytelnik\u00f3w \u201eHabra\u201d \u2014 zni\u017cka 10 000 rubli przy zapisie na dowolny kurs Skillbox z kodem promocyjnym \u201eHabra\u201d.<\/i><\/p>\n<p><b>Skillbox poleca:<\/b> Praktyczny kurs <noindex><a rel=\"nofollow\" href=\"https:\/\/skillbox.ru\/agima\/?utm_source=skillbox.media&amp;utm_medium=habr.com&amp;utm_campaign=AGIMA&amp;utm_content=articles&amp;utm_term=kotlintips\">Mobilny programista PRO<\/a><\/noindex>.\n<\/p><\/blockquote>\n<p>\nTak wygl\u0105da aplikacja w trakcie dzia\u0142ania:<\/p>\n<p><img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/fa375744a4ca5d07667ec494db38648b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\nWprowadzasz po\u017c\u0105dany procent od ca\u0142kowitej kwoty, liczb\u0119 uczestnik\u00f3w spotkania i otrzymujesz wynik \u2014 sum\u0119 napiwk\u00f3w, kt\u00f3re warto zostawi\u0107.<\/p>\n<h3>Rozpoczynamy<\/h3>\n<p>\nPe\u0142ny interfejs aplikacji wygl\u0105da nast\u0119puj\u0105co:<br \/>\n<img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/e95058f09c4a6c151b6c5500ae549c0e.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\n<img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/ac31c73ade24640078c76d71700de0b4.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\nPierwsza czynno\u015b\u0107 \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/lawreyios\/tipcalculator\/tree\/starter_project\">za\u0142adowanie podstawy projektu<\/a><\/noindex>. Otwieramy go w Android Studio 3.0 lub nowszej wersji. Kompilujemy i uruchamiamy projekt, widzimy bia\u0142y ekran. Wszystko w porz\u0105dku, tak ma by\u0107.<\/p>\n<p><img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/f4e3361ddc45d56794cc5c7c36d8b206.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\n<img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/7828c10dcb3936eb095f5110094ea8bf.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\nCzynno\u015bci u\u017cytkownika s\u0105 zapisane w projekcie w kolejno\u015bci chronologicznej, aby wszystko by\u0142o jasne. Aby je zobaczy\u0107, otwieramy Widok -&gt; Okna narz\u0119dzi -&gt; TODO.<\/p>\n<p>Przegl\u0105damy projekt i otwieramy colors.xml, aby oceni\u0107 palet\u0119 kolor\u00f3w. W strings.xml umieszczone s\u0105 dane tekstowe (napisy), a w styles.xml znajduj\u0105 si\u0119 szablony czcionek.<\/p>\n<h3>Rozw\u00f3j sekcji wydatk\u00f3w<\/h3>\n<p>\nOtwieramy activity_main.xml i dodajemy poni\u017cszy kod do LinearLayout (#1):<\/p>\n<pre><code class=\"kotlin\"><\/code><\/pre>\n<p>\nTeraz mo\u017cna dostosowa\u0107 styl katalogu values lub pobawi\u0107 si\u0119 kolorami, korzystaj\u0105c z <noindex><a rel=\"nofollow\" href=\"https:\/\/material.io\/tools\/color\/#!\/?view.left=0&amp;view.right=0&amp;primary.color=37474F\">narz\u0119dzia material.io<\/a><\/noindex>.<\/p>\n<p>Obecnie projekt wygl\u0105da tak:<\/p>\n<p><img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/ab47023cafd97fdbd171a9d9a1c35dd5.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i> Jak wida\u0107, obliczenie wydatk\u00f3w dokonywane jest na podstawie danych wprowadzonych przez u\u017cytkownika. <\/i><\/p>\n<h3>Rozw\u00f3j sekcji rachunk\u00f3w<\/h3>\n<p>\nDodajemy kod poni\u017cej do LinearLayout po sekcji wydatk\u00f3w (#2):<\/p>\n<pre><code class=\"kotlin\">&lt;! \u2014 TODO #3: Zbuduj sekcj\u0119 rachunku \u2192\n \n\u2026<\/code><\/pre>\n<p>\nZamykamy LinearLayout po li\u015bcie TODOs, a nast\u0119pnie dodajemy nowy kod, umieszczaj\u0105c go w LinearLayout (#3):<\/p>\n<pre><code class=\"kotlin\"><\/code><\/pre>\n<p>\nPoniewa\u017c g\u0142\u00f3wnym zadaniem aplikacji jest obliczanie indywidualnych koszt\u00f3w dla ka\u017cdego uczestnika spotkania w restauracji, kluczowe znaczenie ma costPerPersonTextView. <\/p>\n<p>EditText ogranicza wprowadzanie danych do jednej linii, a ten parametr powinien mie\u0107 warto\u015b\u0107 NumberDecimal jako inputType.<\/p>\n<p><img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/7dc4e90d8188a08933e7a92b119472ee.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i> Uruchamiamy projekt do test\u00f3w i wprowadzamy parametry ca\u0142kowych strat (st\u0142uczone fili\u017canki, talerze itp.)<\/i><\/p>\n<h3>Rozw\u00f3j sekcji \u201eLudzie i napiwki\u201d<\/h3>\n<p>\nAby doda\u0107 opcj\u0119 wyboru wysoko\u015bci napiwk\u00f3w, wstawiamy poni\u017cszy kod w now\u0105 sekcj\u0119 LinearLayout (#4):<\/p>\n<pre><code class=\"kotlin\"><\/code><\/pre>\n<p>\nTen fragment kodu jest niezb\u0119dny do precyzyjnego obliczenia kwoty napiwk\u00f3w. Domy\u015blna warto\u015b\u0107 tekstu to 20. ImageButtons maj\u0105 przypisane ikony w folderze z prawami zapisu.<\/p>\n<p>Ca\u0142kowicie kopiujemy sekcj\u0119 i dodajemy nast\u0119puj\u0105ce (#5):<\/p>\n<ul>\n<li> Identyfikatory ImageButton (subtractPeopleButton, addPeopleButton)<\/li>\n<li> Identyfikatory TextView (numberOfPeopleStaticText, numberOfPeopleTextView)<\/li>\n<li> DefaultText dla numberOfPeopleTextView (powinien by\u0107 4).<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/df99acfb33c3d27126db807b805c9c87.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\nTeraz przy uruchomieniu aplikacji istnieje mo\u017cliwo\u015b\u0107 dodania kwoty rachunku, a tak\u017ce dzia\u0142aj\u0105 przyciski \u201eDodaj\/Wyjmij\u201d, ale na razie nic si\u0119 nie dzieje.<\/p>\n<h3>Dodajemy Views<\/h3>\n<p>\nOtwieramy MainActivity.kt i dodajemy to do funkcji initViews (#6):<\/p>\n<pre><code class=\"kotlin\">private fun initViews() {\n        expensePerPersonTextView = findViewById(R.id.expensePerPersonTextView)\n        billEditText = findViewById(R.id.billEditText)\n \naddTipButton = findViewById(R.id.addTipButton)\n        tipTextView = findViewById(R.id.tipTextView)\n        subtractTipButton = findViewById(R.id.subtractTipButton)\n \naddPeopleButton = findViewById(R.id.addPeopleButton)\n        numberOfPeopleTextView = findViewById(R.id.numberOfPeopleTextView)\n        subtractPeopleButton = findViewById(R.id.subtractPeopleButton)\n \n\/\/TODO #8: Bind Buttons to Listener\n \n\/\/TODO #16: Bind EditText to TextWatcher\n \n}<\/code><\/pre>\n<p><\/p>\n<h3>Ko\u0144czymy przyciski<\/h3>\n<p>\nAby doda\u0107 obs\u0142ug\u0119 klikni\u0119cia przycisk\u00f3w, implementujemy View.OnClickListener na poziomie klasy (#7):<\/p>\n<p>class MainActivity: AppCompatActivity(), View.OnClickListener {<\/p>\n<p>Nie uda si\u0119 teraz skompilowa\u0107 projektu, trzeba wykona\u0107 jeszcze kilka czynno\u015bci (#8):<\/p>\n<pre><code class=\"kotlin\">override fun onClick(v: View?) {\n        when (v?.id) {\n            R.id.addTipButton -&gt; incrementTip()\n            R.id.subtractTipButton -&gt; decrementTip()\n            R.id.addPeopleButton -&gt; incrementPeople()\n            R.id.subtractPeopleButton -&gt; decrementPeople()\n        }\n    }<\/code><\/pre>\n<p>\nW przypadku przycisk\u00f3w i prze\u0142\u0105cznik\u00f3w Kotlin jest doskonale zorganizowany! Dodaj poni\u017cszy kod do wszystkich funkcji increment i decrement<br \/>\n (#9\u200a\u2013#12):<\/p>\n<pre><code class=\"kotlin\">private fun incrementTip() {\n        if (tipPercent != MAX_TIP) {\n            tipPercent += TIP_INCREMENT_PERCENT\n            tipTextView.text = String.format(\"%d%%\", tipPercent)\n        }\n    }\n \nprivate fun decrementTip() {\n        if (tipPercent != MIN_TIP) {\n            tipPercent -= TIP_INCREMENT_PERCENT\n            tipTextView.text = String.format(\"%d%%\", tipPercent)\n        }\n    }\n \nprivate fun incrementPeople() {\n        if (numberOfPeople != MAX_PEOPLE) {\n            numberOfPeople += PEOPLE_INCREMENT_VALUE\n            numberOfPeopleTextView.text = numberOfPeople.toString()\n        }\n    }\n \nprivate fun decrementPeople() {\n        if (numberOfPeople != MIN_PEOPLE) {\n            numberOfPeople -= PEOPLE_INCREMENT_VALUE\n            numberOfPeopleTextView.text = numberOfPeople.toString()\n        }\n    }<\/code><\/pre>\n<p>\nTutaj kod zabezpiecza funkcje przyrostu na maksymalnych warto\u015bciach (MAX_TIP &amp; MAX_PEOPLE). Ponadto, kod zabezpiecza funkcje dekrementu na minimalnych warto\u015bciach (MIN_TIP &amp; MIN_PEOPLE).<\/p>\n<p>Teraz \u0142\u0105czymy przyciski z nas\u0142uchiwaczami w funkcji initViews (#13):<\/p>\n<pre><code class=\"kotlin\">private fun initViews() {\n \n...\n \naddTipButton.setOnClickListener(this)\n        subtractTipButton.setOnClickListener(this)\n \naddPeopleButton.setOnClickListener(this)\n        subtractPeopleButton.setOnClickListener(this)\n \n\/\/TODO #15: Bind EditText to TextWatcher\n}<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/73e7477d4b02548aad7c2112c6be5d80.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\nTeraz mo\u017cna dodawa\u0107 ca\u0142kowite wydatki, napiwki i liczb\u0119 uczestnik\u00f3w spotkania. A teraz najwa\u017cniejsze\u2026<\/p>\n<h3>Sekcja obliczania wydatk\u00f3w<\/h3>\n<p>Ten kod oblicza wydatki (#14):<\/p>\n<pre><code class=\"kotlin\">private fun calculateExpense() {\n \nval totalBill = billEditText.text.toString().toDouble()\n \nval totalExpense = ((HUNDRED_PERCENT + tipPercent) \/ HUNDRED_PERCENT) * totalBill\n        val individualExpense = totalExpense \/ numberOfPeople\n \nexpensePerPersonTextView.text = String.format(\"$%.2f\", individualExpense)\n \n}<\/code><\/pre>\n<p>\nA tutaj wywo\u0142ywana jest funkcja, kt\u00f3ra pozwala uwzgl\u0119dni\u0107 liczb\u0119 os\u00f3b w firmie i obliczy\u0107 napiwki (#15):<\/p>\n<pre><code class=\"kotlin\">private fun incrementTip() {\n \n\u2026\n \n}\n \nprivate fun decrementTip() {\n \n\u2026\n \n}\n \nprivate fun incrementPeople() {\n \n\u2026\n \n}\n \nprivate fun decrementPeople() {\n \n\u2026\n \n}<\/code><\/pre>\n<p>\nUruchamiamy aplikacj\u0119. Wygl\u0105da i dzia\u0142a \u015bwietnie. Mo\u017ce by\u0107 jednak lepiej.<\/p>\n<p>Je\u015bli spr\u00f3bujesz usun\u0105\u0107 kwot\u0119 rachunku, a nast\u0119pnie zwi\u0119kszy\u0107 liczb\u0119 wskaz\u00f3wek lub znajomych, aplikacja ulegnie awarii, poniewa\u017c brak jest jeszcze weryfikacji dla zerowej warto\u015bci koszt\u00f3w. Co wi\u0119cej, je\u015bli spr\u00f3bujesz zmieni\u0107 kwot\u0119 rachunku, wydatki nie zostan\u0105 zaktualizowane.<\/p>\n<h3>Ostatnie kroki<\/h3>\n<p>\nDodajemy TextWatcher (#16):<\/p>\n<p>class MainActivity: AppCompatActivity(), View.OnClickListener, TextWatcher {<\/p>\n<p>Nast\u0119pnie wstawiamy nas\u0142uchiwacz billEditText (#17):<\/p>\n<p>billEditText.addTextChangedListener(this)<\/p>\n<p>Dodatkowo dodajemy kod do wykonania TextWatcher (#18):<\/p>\n<pre><code class=\"kotlin\">override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {\n        if (!billEditText.text.isEmpty()) {\n            calculateExpense()\n        }\n    }\noverride fun afterTextChanged(s: Editable?) {}\n\n    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/623256a43c969d8b3a434d10a357c1a0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\nA teraz wszystko dzia\u0142a idealnie! Gratulacje, napisa\u0142e\u015b w\u0142asny \"Kalkulator napiwk\u00f3w\" w Kotlinie.<\/p>\n<p><img decoding=\"async\" alt=\"Jak stworzy\u0107 kalkulator napiwk\u00f3w w Kotlinie: jak to dzia\u0142a?\" src=\"\/wp-content\/uploads\/2019\/04\/5650bfecfadf3fd56785b7d6ac72ed87.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<blockquote><p><b>Skillbox poleca:<\/b><\/p>\n<ul>\n<li>Dwuletni praktyczny kurs <noindex><a rel=\"nofollow\" href=\"https:\/\/iamwebdev.skillbox.ru\/?utm_source=skillbox.media&amp;utm_medium=habr.com&amp;utm_campaign=WEBDEVPRO&amp;utm_content=articles&amp;utm_term=kotlintips\">\u201eJestem programist\u0105 internetowym PRO\u201d<\/a><\/noindex>.<\/li>\n<li>Kurs online <noindex><a rel=\"nofollow\" href=\"https:\/\/skillbox.ru\/c-sharp\/?utm_source=skillbox.media&amp;utm_medium=habr.com&amp;utm_campaign=CSHDEV&amp;utm_content=articles&amp;utm_term=kotlintips\">\u201eProgramista C#\u201d<\/a><\/noindex>.<\/li>\n<li>Praktyczny roczny kurs <noindex><a rel=\"nofollow\" href=\"https:\/\/skillbox.ru\/php\/?utm_source=skillbox.media&amp;utm_medium=habr.com&amp;utm_campaign=PHPDEV&amp;utm_content=articles&amp;utm_term=kotlintips\">\u00abPHP programista od 0 do PRO\u00bb<\/a><\/noindex>.\n<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/skillbox\/blog\/448582\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u043c, \u043a\u0430\u043a \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u043f\u0440\u043e\u0441\u0442\u043e\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u0440\u0430\u0441\u0447\u0435\u0442\u0430 \u0447\u0430\u0435\u0432\u044b\u0445 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Kotlin. \u0415\u0441\u043b\u0438 \u0442\u043e\u0447\u043d\u0435\u0435, \u0442\u043e Kotlin 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\u043f\u0440\u0438\u0433\u043e\u0434\u0438\u0442\u0441\u044f, \u043a\u043e\u0433\u0434\u0430 \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u0434\u0441\u0447\u0438\u0442\u0430\u0442\u044c \u0441\u0443\u043c\u043c\u0443 \u0447\u0430\u0435\u0432\u044b\u0445 \u0441 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":23712,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-31843","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u043c, \u043a\u0430\u043a \u0441\u043e\u0437\u0434\u0430\u0442\u044c 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