@ü.li:Listing 1: LinearLayout mit einem EditText-Element und einem Button in klassischem Layout-XML von Android @li: @ü.li:Listing 2: Layout aus Listing~~1 in Kotlin-Notation, ergänzt um einen Handler für onClick des Button @li:val act = this val layout = LinearLayout(act) layout.orientation = LinearLayout.VERTICAL val name = EditText(act) val button = Button(act) button.text = "Say Hello" button.setOnClickListener { Toast.makeText(act, "Hello, ${name.text}!", Toast.LENGTH_SHORT).show() } layout.addView(name) layout.addView(button) @ü.li:Listing 3: Eine Extension Function auf MutableList zeigt den Einsatz von this @li:fun MutableList.swap(index1: Int, index2: Int) { val temp = this[index1] this[index1] = this[index2] this[index2] = temp } @ü.li:Listing 4: Ein einfacher JSON-Builder in Groovy @li:JsonBuilder builder = new JsonBuilder() builder.records { car { name 'HSV Maloo' make 'Holden' year 2006 country 'Australia' } } String json = JsonOutput.prettyPrint(builder.toString()) @ü.li:Listing 5: Html-Klasse und html-Funktion für den Kotlin-HTML-Builder @li:fun html(htmlBuilder: Html.() -> Unit): Html { val html = Html() html.htmlBuilder() return html } class Html { private var head: Head? = null private var body: Body? = null fun head(headBuilder: Head.() -> Unit) { head = Head() head?.headBuilder() } fun body(bodyBuilder: Body.() -> Unit) { body = Body() body?.bodyBuilder() } } @ü.li:Listing 6: Die Klassen Head und Title @li:class Head { private var title: Title? = null fun title(text: String) { title = Title(text) } } class Title (private val text: String) { } @ü.li:Listing 7: Die Klassen Body und Paragraph @li:class Body { private val paragraphs: ArrayList = ArrayList() var p: String private get() = null!! set(value) { paragraphs.add(Paragraph(value)) } } class Paragraph (private val text: String) { } @ü.li:Listing 8: Das DSL-Layout in einem AnkoComponent @li:class MainActivityUI : AnkoComponent { override fun createView(ui: AnkoContext) = with(ui) { frameLayout { recyclerView { id = R.id.animal_list layoutManager = LinearLayoutManager(ctx) } } } } @ü.li:Listing 9: JUnit-Test in Kotlin @li:class PetDataSexMapperTest { companion object { val MALE_IN = "M" val MALE_OUT = "Male" val FEMALE_IN = "F" val FEMALE_OUT = "Female" } @Test fun convertMtoMale() { val actual = PetDataSexMapper.petSexShortFullMapper(MALE_IN) val expected = MALE_OUT Assert.assertEquals("M should convert to Male", expected, actual) } ... } @ü.li:Listing 10: Spek-Test in Kotlin @li:class PetDataSexMapperSpec: Spek({ describe("a pet's sex string converter") { it("should return 'Male' when 'M' is being passed in") { val result = PetDataSexMapper.petSexShortFullMapper("M") assertEquals("Male", result) } it("should return 'Female' when F' is being passed in") { val result = PetDataSexMapper.petSexShortFullMapper("F") assertEquals("Female", result) } } })