The document discusses lambda expressions and functions in Kotlin. It shows examples of lambda expressions that can be passed to functions as arguments. These lambda expressions often take the form of (parameter) -> expression, allowing a function to be executed without being declared separately. The document also demonstrates extension functions, which allow adding new functionality to existing classes through functions with a receiver type specified before the function name.

13. <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/
apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="jp.watanave.ankosamples.XMLActivity">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SAY hello"/>
</LinearLayout>

14. verticalLayout {
editText()
button("Say Hello")
}

15. <LinearLayout xmlns:android="http://schemas.android.com/
apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="jp.watanave.ankosamples.XMLActivity">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SAY hello"/>
</LinearLayout>
verticalLayout {
editText()
button("Say Hello")
}

16. <LinearLayout >
<EditText/>
<Button/>
</LinearLayout>
verticalLayout {
editText()
button("Say Hello")
}

17. <LinearLayout >
<EditText/>
<Button/>
</LinearLayout>
verticalLayout {
editText()
button("Say Hello")
}

18. <LinearLayout >
<EditText/>
<Button/>
</LinearLayout>
verticalLayout {
editText()
button("Say Hello")
}

20. <LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:background="@android:color/darker_gray"
tools:context="jp.watanave.ankosamples.XMLActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/red"
android:textColor="#FF0000"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/white"
android:textColor="#FFFFFF"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/yellow"
android:textColor="#FFFB00"/>
</LinearLayout>

21. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}

22. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}

23. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}

24. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}

25. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
}

26. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
}

27. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}

28. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}

29. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
textView {
text = “ "
textColor = Color.RED
}

30. textView {
text = “ "
textColor = Color.RED
}

31. view {
=
}

32. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}

33. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.WHITE
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.YELLOW
}.lparams {
margin = dip(10)
}
}

34. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.WHITE
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.YELLOW
}.lparams {
margin = dip(10)
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.WHITE
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.YELLOW
}.lparams {
margin = dip(10)
}
}

35. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.WHITE
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.YELLOW
}.lparams {
margin = dip(10)
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.WHITE
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.YELLOW
}.lparams {
margin = dip(10)
}
}

36. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.WHITE
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.YELLOW
}.lparams {
margin = dip(10)
}
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.WHITE
}.lparams {
margin = dip(10)
}
textView {
text = " "
textColor = Color.YELLOW
}.lparams {
margin = dip(10)
}
}
textView {
text = " "
textColor = Color.RED
}.lparams {
margin = dip(10)
}

37. textView {
text = " "
textColor = Color.RED
}.lparams {
margin = dip(10)
}

38. view {
}.lparams {
LayoutParams =
}

39. interface AnkoComponent<in T> {
fun createView(ui: AnkoContext<T>): View
}

40. class MyActivity : AppCompatActivity() {
//
}

41. class MyActivity : AppCompatActivity() {
//
}
class MyActivityUI : AnkoComponent<MyActivity> {
}

42. class MyActivity : AppCompatActivity() {
//
}
class MyActivityUI : AnkoComponent<MyActivity> {
}
class MyActivity : AppCompatActivity() {
//
}
class MyActivityUI : AnkoComponent<MyActivity> {
}

43. class MyActivity : AppCompatActivity() {
//
}
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View {
// DSL
}
}

44. class MyActivity : AppCompatActivity() {
//
}
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View {
// DSL
}
}
class MyActivity : AppCompatActivity() {
//
}
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View {
// DSL
}
}

45. class MyActivity : AppCompatActivity() {
//
}
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View {
// DSL
}
}

46. class MyActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
}
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View {
// DSL
}
}

47. class MyActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
}
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View {
// DSL
}
}

48. class MyActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
MyActivityUI().setContentView(this)
}
}
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View {
// DSL
}
}

49. class MyActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
MyActivityUI().setContentView(this)
}
}
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View {
// DSL
}
}
class MyActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
MyActivityUI().setContentView(this)
}
}
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View {
// DSL
}
}

55. !

57. "

61. #

63. $

65. %

66. &
'
(
)
*

67. *

71. ( ) ->

72. val lambda:( ) -> = { ->
// doSomething
}
val result = lambda(arg)

73. val lambda : (String)->Int = { str ->
val count = str.count()
count //
}
val result = lambda(“DroidKaigi2018")
// 14
( ) ->

74. val lambda : (String)->Int = { str ->
val count = str.count()
count //
}
val result = lambda(“DroidKaigi2018")
// 14

77. val array = (0..10)
array.forEach({ num ->
print(num)
})

79. val array = (0..10)
array.forEach({ num ->
print(num)
})

80. val array = (0..10)
array.forEach(
print(num)
})
({ num ->

81. val array = (0..10)
array.forEach(
print(num)
}
)( { num ->

82. val array = (0..10)
array.forEach() { num ->
print(num)
}

84. val array = (0..10)
array.forEach() { num ->
print(num)
}

85. val array = (0..10)
array.forEach() { num ->
print(num)
}

86. val array = (0..10)
array.forEach() { num ->
print(num)
}
val array = (0..10)
array.forEach() { num ->
print(num)
}

87. val array = (0..10)
array.forEach { num ->
print(num)
}

88. array.forEach { num ->
print(num)
}

89. array.forEach { num ->
print(num)
}
linearLayout {
// doSomething
}
"

90. linearLayout {
// doSomething
}
linearLayout

93. this

94. class MyClass {
fun createTextView() : TextView {
return TextView(context)
}
}

95. class MyClass {
fun createTextView(argLambda: ()->Unit) : TextView {
return TextView(context)
}
}

96. class MyClass {
fun createTextView(argLambda: ()->Unit) : TextView {
return TextView(context)
}
fun doSomething() {
createTextView ({
// do something
})
}
}

97. class MyClass {
fun createTextView(argLambda: ()->Unit) : TextView {
return TextView(context)
}
fun doSomething() {
createTextView ({
// do something
})
}
}
class MyClass {
fun createTextView(argLambda: ()->Unit) : TextView {
return TextView(context)
}
fun doSomething() {
createTextView ({
// do something
})
}
}

98. class MyClass {
fun createTextView(argLambda: (TextView)->Unit) : TextView {
return TextView(context)
}
fun doSomething() {
createTextView {
// do something
}
}
}

99. class MyClass {
fun createTextView(argLambda: (TextView)->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}
fun doSomething() {
createTextView {
// do something
}
}
}

100. class MyClass {
fun createTextView(argLambda: (TextView)->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}
fun doSomething() {
createTextView { textView ->
textView.text = " "
}
}
}

101. class MyClass {
fun createTextView(argLambda: (TextView)->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}
fun doSomething() {
createTextView { textView ->
textView.text = " "
}
}
}

102. class MyClass {
fun createTextView(argLambda: (TextView)->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}
fun doSomething() {
createTextView { textView ->
textView.text = " "
}
}
}

103. class MyClass {
fun createTextView(argLambda: (TextView)->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}
fun doSomething() {
createTextView { textView ->
textView.text = " "
}
}
}
createTextView { textView ->
textView.text = “ "
}

104. createTextView { textView ->
textView.text = " "
}
textView {
text = " "
}

105. createTextView { textView ->
textView.text = " "
}
textView {
this.text = " "
this is TextView // true
}

106. fun createTextView(argLambda: (TextView)->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}

108. .( ) ->
( ) ->
+

109. this .( ) ->
( ) ->
+

110. fun createTextView(argLambda: (TextView)->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}
.( ) ->
( ) ->
+

111. fun createTextView(argLambda: (TextView)->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}
.( ) ->
( ) ->
+

112. fun createTextView(argLambda: (TextView)->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}
.( ) ->
( ) ->
+

113. fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
argLambda(view)
return view
}
.( ) ->
( ) ->
+

114. fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}

115. class MyClass {
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
createTextView {
text = " "
this is TextView // true
}
}
}

116. class MyClass {
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
createTextView {
text = " "
this is TextView // true
}
}
}
class MyClass {
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
createTextView {
text = " "
this is TextView // true
}
}
}

120. +
fun lparams() {
// do something
}
+
fun TextView.lparams() {
// do something
}

121. class MyClass {
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
val textView = createTextView {
text = " "
}
textView.lparams()
}
}
class MyClass {
fun TextView.lparams() {
this is TextView // true
}
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
val textView = createTextView {
text = " "
}
textView.lparams()
}
}

122. class MyClass {
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
val textView = createTextView {
text = " "
}
textView.lparams()
}
}
class MyClass {
fun TextView.lparams() {
this is TextView // true
}
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
val textView = createTextView {
text = " "
}
textView.lparams()
}
}

123. class MyClass {
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
val textView = createTextView {
text = " "
}
textView.lparams()
}
}
class MyClass {
fun TextView.lparams() {
// do something
}
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
val textView = createTextView {
text = " "
}
textView.lparams()
}
}

124. class MyClass {
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
val textView = createTextView {
text = " "
}
textView.lparams()
}
}
class MyClass {
fun TextView.lparams() {
// do something
}
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
val textView = createTextView {
text = " "
}
textView.lparams()
}
}
class MyClass {
fun TextView.lparams() {
// do something
}
fun createTextView(argLambda: TextView.()->Unit) : TextView {
val view = TextView(context)
view.argLambda()
return view
}
fun doSomething() {
val textView = createTextView {
text = " "
}
textView.lparams()
}
}

127. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}

128. override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
}

129. override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
}
override fun createView(ui: AnkoContext<MyActivity>): View
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
}

130. override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
}

131. override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
}
override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
}

132. inline fun <T, R> with(receiver: T, block: T.() -> R): R (source)

133. inline fun <T, R> with(receiver: T, block: T.() -> R): R (source)

134. override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
}

135. override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
return ui.linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
textView {
text = " "
textColor = Color.WHITE
}
textView {
text = " "
textColor = Color.YELLOW
}
}
}

136. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}

137. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}

138. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}

139. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}

140. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}

141. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
} .( ) ->

142. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}
.( ) ->

143. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}

144. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}

145. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}

146. inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}
override fun createView(ui: AnkoContext<MainActivity>): View = with(ui) {
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}
//
}
}
inline fun AnkoContext<*>.linearLayout(init: LinearLayout.() -> Unit): _LinearLayout {
val context = this.ctx
val view = LinearLayout(context)
view.init()
(context as Activity).setContentView(view)
return view
}

147. _LinearLayout

150. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams(width, height)
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

151. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams(width, height)
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

152. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams(width, height)
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}
class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams(width, height)
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

153. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams(width, height)
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

154. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams(width, height)
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}
class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams(width, height)
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

155. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams()
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

156. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams()
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

157. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams()
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

158. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams()
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}
class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams()
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

159. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams()
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

160. class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams()
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}
class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
val layoutParams = LinearLayout.LayoutParams()
layoutParams.init()
this.layoutParams = layoutParams
return this
}
}

161. class _FrameLayout(context: Context) : FrameLayout(context) {
fun TextView.lparams(init: FrameLayout.LayoutParams.() -> Unit): TextView {
class _RelativeLayout(context: Context) : RelativeLayout(context) {
fun TextView.lparams(init: RelativeLayout.LayoutParams.() -> Unit): TextView {
class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {

162. class _FrameLayout(context: Context) : FrameLayout(context) {
fun TextView.lparams(init: FrameLayout.LayoutParams.() -> Unit): TextView {
class _RelativeLayout(context: Context) : RelativeLayout(context) {
fun TextView.lparams(init: RelativeLayout.LayoutParams.() -> Unit): TextView {
class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
class _LinearLayout(context: Context) : LinearLayout(context) {
fun TextView.lparams(init: LinearLayout.LayoutParams.() -> Unit): TextView {
class _FrameLayout(context: Context) : FrameLayout(context) {
fun TextView.lparams(init: FrameLayout.LayoutParams.() -> Unit): TextView {
class _RelativeLayout(context: Context) : RelativeLayout(context) {
fun TextView.lparams(init: RelativeLayout.LayoutParams.() -> Unit): TextView {

163. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
weight = 1.0f
// this LayoutParams ,
}
//
}

164. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
weight = 1.0f
}
//
}

165. linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
weight = 1.0f
}
//
}
linearLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
weight = 1.0f
}
//
}

166. relativeLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
centerInParent()
}
//
}

167. relativeLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
centerInParent()
}
//
}
relativeLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
centerInParent()
}
//
}

168. relativeLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
centerInParent()
}
//
}
relativeLayout {
backgroundColor = Color.DKGRAY
textView {
text = " "
textColor = Color.RED
}.lparams {
centerInParent()
}
//
}
<TextView
android:layout_centerInParent="true"/>

172. class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
verticalLayout {
editText {
id = View.generateViewId()
}
button("OK") {
id = View.generateViewId()
}
}
}
}

173. class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
verticalLayout {
editText {
id = View.generateViewId()
}
button("OK") {
id = View.generateViewId()
}
}
}
}

184. inline fun generateViewId(): Int = Throwable().stackTrace.first().lineNumber
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
verticalLayout {
editText {
id = generateViewId()
}
button("OK") {
id = generateViewId()
}
}
}
}
-renamesourcefileattribute SourceFile
-keepattributes SourceFile,LineNumberTable

185. inline fun generateViewId(): Int = Throwable().stackTrace.first().lineNumber
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
verticalLayout {
editText {
id = generateViewId()
}
button("OK") {
id = generateViewId()
}
}
}
}
-renamesourcefileattribute SourceFile
-keepattributes SourceFile,LineNumberTable

186. inline fun viewIdFromLineNumber(): Int =
Throwable().stackTrace.first().lineNumber
class MyActivityUI : AnkoComponent<MyActivity> {
override fun createView(ui: AnkoContext<MyActivity>): View = with(ui) {
verticalLayout {
editText {
id = viewIdFromLineNumber()
}
button("OK") {
id = viewIdFromLineNumber()
}
}
}
}
-renamesourcefileattribute SourceFile
-keepattributes SourceFile,LineNumberTable

187. -

188. -
linearLayout {
(0..5).forEach {
textView {
id = viewIdFromLineNumber()
}
}
}