{"id":933,"date":"2020-06-08T13:41:55","date_gmt":"2020-06-08T16:41:55","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=933"},"modified":"2020-06-08T13:41:57","modified_gmt":"2020-06-08T16:41:57","slug":"kotlin-para-android-6","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/kotlin-para-android-6\/","title":{"rendered":"Kotlin para Android #6"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/kotlin-para-android-6\/#Mais_Propriedades_do_Invoice\" >Mais Propriedades do Invoice<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/kotlin-para-android-6\/#Inicializacao_do_Invoice\" >Inicializa\u00e7\u00e3o do Invoice<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/kotlin-para-android-6\/#Instanciacao_no_Kotlin\" >Instancia\u00e7\u00e3o no Kotlin<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/kotlin-para-android-6\/#Adicionando_Funcoes_para_Invoices\" >Adicionando Fun\u00e7\u00f5es para Invoices<\/a><\/li><\/ul><\/nav><\/div>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mais_Propriedades_do_Invoice\"><\/span><strong>Mais Propriedades do Invoice<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>O corpo da classe ainda est\u00e1 vazia, mas n\u00f3s podemos facilmente pensar nas propriedades que n\u00f3s queremos adicionar. Por exemplo, pode ser interessante temos o nome completo do comprador e o pre\u00e7o total de todos os itens. Vamos adicionar essas propriedades:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Invoice(val nomeComprador:String,\n    val sobrenomeComprador:String,\n    val date: String,\n    val nomeProduto:String,\n    val quantidade: Int,\n    val precoPorItem:Double) {\nval nomeCompletoComprador: String\nval precoTotal: Double\n}<\/code><\/pre>\n\n\n\n<p>N\u00f3s esquecemos de inicializar as propriedades para adicionar valores via = alguma coisa? Fazer assim na verdade \u00e9 proibido, porque vamos inicializar essas propriedades dentro do init{}.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Inicializacao_do_Invoice\"><\/span><strong>Inicializa\u00e7\u00e3o do Invoice<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Vamos adicionar o bloco init{}:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Invoice(val nomeComprador:String,\n    val sobrenomeComprador:String,\n    val date: String,\n    val nomeProduto:String,\n    val quantidade: Int,\n    val precoPorItem:Double) {\nval nomeCompletoComprador: String\nval precoTotal: Double\ninit {\n\tnomeCompletoComprador = compradorPrimeiroNome + \u201c \u201c + sobrenomeComprador\n\tprecoTotal = total * precoPorItem\n}\n}\n<\/code><\/pre>\n\n\n\n<p>Contudo, d\u00e1 para escrever esse inicializador com menos c\u00f3digo:<\/p>\n\n\n\n<p>&#8230;<\/p>\n\n\n\n<p>val nomeCompletoComprador: String = compradorPrimeiroNome + \u201c \u201c + sobrenomeComprador<\/p>\n\n\n\n<p>val precoTotal: Double = total * precoPorItem<\/p>\n\n\n\n<p>O bloco init{} n\u00e3o \u00e9 necess\u00e1rio. Contudo, n\u00e3o tem diferen\u00e7a colocar o bloco init{}, depois haver\u00e1 c\u00e1lculos mais complexos que n\u00e3o caber\u00e3o em uma declara\u00e7\u00e3o.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Instanciacao_no_Kotlin\"><\/span><strong>Instancia\u00e7\u00e3o no Kotlin<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Com a classe pronta, inst\u00e2ncia um objeto Invoice dessa classe:<\/p>\n\n\n\n<p>val nomeInvoice = Invoice(\u201cRichard\u201d, \u201cSmith\u201d, \u201c2020-06-08\u201d, \u201cervilhas\u201d, 5, 2.99)<\/p>\n\n\n\n<p>Vamos juntar tudo em um c\u00f3digo e arquivo.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Invoice(val nomeComprador:String,\n    val sobrenomeComprador:String,\n    val date: String,\n    val nomeProduto:String,\n    val quantidade: Int,\n    val precoPorItem:Double) {\nval nomeCompletoComprador: String\nval precoTotal: Double\ninit {\n\tnomeCompletoComprador = compradorPrimeiroNome + \u201c \u201c + sobrenomeComprador\n\tprecoTotal = total * precoPorItem\n}\nfun main(args: Array&lt;String>){\n\tval nomeInvoice = Invoice(\u201cRichard\u201d, \u201cSmith\u201d, \u201c2020-06-08\u201d, \u201cervilhas\u201d, 5, 2.99)\n\t\/\/fa\u00e7a alguma coisa\n}\n}\n<\/code><\/pre>\n\n\n\n<p>A fun\u00e7\u00e3o main() \u00e9 o ponto de entrada das aplica\u00e7\u00f5es Kotlin. Infelizmente, isso n\u00e3o funciona no Android, porque o Android tem uma maneira diferente para iniciar apps.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Adicionando_Funcoes_para_Invoices\"><\/span><strong>Adicionando Fun\u00e7\u00f5es para Invoices<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Nossa classe Invoice n\u00e3o tem fun\u00e7\u00f5es expl\u00edcitas. Eu deliberadamente disse expl\u00edcita, porque em virtude de ambos as propriedades do construtor e as propriedades que n\u00f3s adicionamos na classe, Kotlin fornece fun\u00e7\u00f5es acess\u00f3rias impl\u00edcitas na forma de objectName.propertyName. Por exemplo:<\/p>\n\n\n\n<p>&#8230;<\/p>\n\n\n\n<p>val nomeInvoice = Invoice(\u201cRichard\u201d, \u201cSmith\u201d, \u201c2020-06-08\u201d, \u201cervilhas\u201d, 5, 2.99)<\/p>\n\n\n\n<p>val nomeCompleto = nomeInvoice.nomeCompletoComprador<\/p>\n\n\n\n<p>Onde nomeInvoice.nomeCompletoComprador l\u00ea o nome completo do comprador do object. Sob diferentes circunst\u00e2ncias, tamb\u00e9m poder\u00edamos usar os acessadores para escrever propriedades, como em<\/p>\n\n\n\n<p>&#8230;<\/p>\n\n\n\n<p>val nomeInvoice = Invoice(\u201cRichard\u201d, \u201cSmith\u201d, \u201c2020-06-08\u201d, \u201cervilhas\u201d, 5, 2.99)<\/p>\n\n\n\n<p>nomeInvoice. sobrenomeComprador = \u201cDoubtFire\u201d<\/p>\n\n\n\n<p>Voc\u00ea entendeu por que fizemos isso? Lembre-se, n\u00f3s declaramos comprador \u2013 sobrenome como um imut\u00e1vel val, ent\u00e3o n\u00e3o pode ser mudado. Se substituirmos o val pelo var, a vari\u00e1vel torna mut\u00e1vel e as configura\u00e7\u00f5es permitir\u00e3o a opera\u00e7\u00e3o.<\/p>\n\n\n\n<p>Como exemplo para uma fun\u00e7\u00e3o expl\u00edcita, n\u00f3s podemos criar um significado para identificar o seu estado. Vamos chamar essa fun\u00e7\u00e3o getState(). Podemos fazer assim:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Invoice(&#91;par\u00e2metros do construtor]){\n\tval compradorNomeCompleto: String\n\tval precoTotal: Double\n\tinit{&#91;inicializar c\u00f3digo]}\n\tfun getState(): String{\n\t\treturn \u201cNome : ${nome}\\n\u201d +\n\t\t\t\u201cSobrenome: ${sobrenome}\\n\u201d +\n\u201cNome Completo: ${compradorNomeCompleto}\\n\u201d +\n\u201cData: ${data}\\n\u201d +\n\u201cProduto: ${nomeProduto}\\n\u201d +\n\u201cQuantidade: ${quantidade}\\n\u201d +\n\u201cPre\u00e7o por Item: ${precoPorItem}\\n\u201d +\n\u201cPre\u00e7o Total: ${precoTotal}\\n\u201d \n}\n}\n<\/code><\/pre>\n\n\n\n<p>Fonte livro:\u00a0Learn\u00a0Kotlin\u00a0for Android\u00a0Development: The Next\u00a0Generation\u00a0Language\u00a0for\u00a0Modern\u00a0Android Apps\u00a0Programming<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mais Propriedades do Invoice O corpo da classe ainda est\u00e1 vazia, mas n\u00f3s podemos facilmente pensar nas propriedades que n\u00f3s queremos adicionar. Por exemplo, pode ser interessante temos o nome completo do comprador e o pre\u00e7o total de todos os itens. Vamos adicionar essas propriedades: N\u00f3s esquecemos de inicializar as propriedades para adicionar valores via [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":130,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34,35],"tags":[],"class_list":["post-933","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-android","category-kotlin"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.5 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Kotlin para Android #6 - Viciados em Aprender<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/kotlin-para-android-6\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kotlin para Android #6\" \/>\n<meta property=\"og:description\" content=\"Mais Propriedades do Invoice O corpo da classe ainda est\u00e1 vazia, mas n\u00f3s podemos facilmente pensar nas propriedades que n\u00f3s queremos adicionar. 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Viciados em Aprender","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/micheladrianomedeiros.com.br\/blog\/kotlin-para-android-6\/","og_locale":"pt_PT","og_type":"article","og_title":"Kotlin para Android #6","og_description":"Mais Propriedades do Invoice O corpo da classe ainda est\u00e1 vazia, mas n\u00f3s podemos facilmente pensar nas propriedades que n\u00f3s queremos adicionar. 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