Android Summit 2020: Learn Jetpack Compose By Example

Over the course of the last few years Android development has gone through significant changes in how we structure our apps, the language we use for development, the tooling & libraries that help us speed up our development and the improvements in testing our apps. What had not changed in all these years is the Android UI toolkit. This changes with Jetpack Compose that aims to reimagine what Android UI development would look like using declarative programming principles. It is heavily influenced by existing web and mobile frameworks such as React, Litho, Vue & Flutter and would be a paradigm shift in Android UI development as we know it.

In this talk, we will take a deeper look at what declarative programming means and how we should think about it when building our apps. We will look into the main principles of Jetpack Compose and try to draw parallels with the “old Android way” of doing common tasks. Lastly, we will dive into various code examples and learn how to build layouts, manage state, write custom views, style our views, access resources and more, all using Jetpack Compose.

Companion code – https://github.com/vinaygaba/Learn-Jetpack-Compose-By-Example

Transcript

1. Learn Jetpack Compose by Example Vinay Gaba @vinaygaba Join the conversation in #session-chat-d2-s2-t1
2. Jetpack Compose / jet·pak kuhm·powz / noun Jetpack Compose is a declarative & modern toolkit for building native Android UI. It simplifies and accelerates UI development on Android.
3. Why do we need Compose?
4. Why do we need Compose? UI Toolkit is tied to the OS State Management is tricky Lots of context switching Simple things still require a lot of code
5. Why do we need Compose? UI Toolkit is tied to the OS State Management is tricky Lots of context switching Simple things still require a lot of code
6. Why do we need Compose? UI Toolkit is tied to the OS State Management is tricky Lots of context switching Simple things still require a lot of code
7. Why do we need Compose? UI Toolkit is tied to the OS State Management is tricky Lots of context switching Simple things still require a lot of code
8. Why do we need Compose? UI Toolkit is tied to the OS State Management is tricky Lots of context switching Simple things still require a lot of code
9. Disclaimer
10. Disclaimer Examples are based on 1.0.0-alpha03 Compose is in alpha so API’s can still change Beta release expected in the next few months
11. Disclaimer Examples are based on 1.0.0-alpha03 Compose is in alpha so API’s can still change Beta release expected in the next few months
12. Disclaimer Examples are based on 1.0.0-alpha03 Compose is in alpha so API’s can still change Beta release expected in the next few months
13. Disclaimer Examples are based on 1.0.0-alpha03 Compose is in alpha so API’s can still change Beta release expected in the next few months
14. Examples
15. Hello World
16. class HelloWorldActivity: AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) } }
17. class HelloWorldActivity: AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { } } }
18. fun ComponentActivity.setContent( recomposer: Recomposer = Recomposer.current(), content: @Composable () "-> Unit ): Composition { "// Some magic ✨ }
19. class HelloWorldActivity: AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { } } }
20. class HelloWorldActivity: AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { Text(text = "Hello World") } } }
21. class HelloWorldActivity: AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { Text(text = "Hello World") } } }
22. class HelloWorldActivity: AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { Text(text = "Hello World") } } }
23. @Composable fun CustomTextComponent() { Text(text = "Hello World") }
24. @Composable fun CustomTextComponent(displayText: String) { Text( text = displayText, style = TextStyle( fontSize = 18.sp, fontFamily = FontFamily.Monospace ) ) }
25. @Composable fun CustomTextComponent(displayText: String) { Text( text = displayText, style = TextStyle( fontSize = 18.sp, fontFamily = FontFamily.Monospace ) ) }
26. @Composable fun CustomTextComponent(displayText: String) { Text( text = displayText, style = TextStyle( fontSize = 18.sp, fontFamily = FontFamily.Monospace ) ) } @Preview @Composable fun CustomTextComponentPreview() { CustomTextComponent("Hello World") }
29. Display Image
30. @Composable fun DrawableImage() { }
31. @Composable fun DrawableImage() { val image = loadImageResource(R.drawable.landscape) }
32. @Composable fun DrawableImage() { val image = loadImageResource(R.drawable.landscape) image.resource.resource"?.let { Image(asset = it, modifier = Modifier.preferredSize(200.dp)) } } Modifiers are your best friends!
33. @Composable fun DrawableImage(@DrawableRes resId: Int) { val image = loadImageResource(resId) image.resource.resource"?.let { Image( asset = it, modifier = Modifier.preferredSize(200.dp) ) } }
34. @Composable fun DrawableImage(@DrawableRes resId: Int) { val image = loadImageResource(resId) image.resource.resource"?.let { Image( asset = it, modifier = Modifier.preferredSize(200.dp) ) } }
35. Modifiers
36. Text( text = "Hello", modifier = Modifier.padding(16.dp) )
37. Text( text = "Hello", modifier = Modifier.padding(16.dp) .background(color = Color.Red) )
38. Text( text = "Hello", modifier = Modifier.padding(16.dp) .background(color = Color.Red) )
39. Text( text = "Hello", modifier = Modifier.padding(16.dp) .background(color = Color.Red) ) Hello
40. Text( text = "Hello", modifier = Modifier.background(color = Color.Red) .padding(16.dp) )
41. Text( text = "Hello", modifier = Modifier.background(color = Color.Red) .padding(16.dp) )
42. Text( text = "Hello", modifier = Modifier.background(color = Color.Red) .padding(16.dp) ) Hello The order of a Modifier has an impact on the behavior
43. Alert Dialog
44. Jetpack Compose / jet·pak kuhm·powz / noun Jetpack Compose is a declarative & modern toolkit for building native Android UI. It simplifies and accelerates UI development on Android.
45. How What vs
46. How What
47. How What // Classic Android val alertDialog = AlertDialog.Builder(context) .setTitle("Android Summit!”) .setMessage("Isn't this conference amazing?") // Somewhere else in code if (some_condition_is_met()) { alertDialog.show() } // Somewhere else in code if (some_other_condition_is_met()) { alertDialog.dismiss() }
48. How What // Classic Android val alertDialog = AlertDialog.Builder(context) .setTitle("Android Summit!”) .setMessage("Isn't this conference amazing?") // Somewhere else in code if (some_condition_is_met()) { alertDialog.show() } // Somewhere else in code if (some_other_condition_is_met()) { alertDialog.dismiss() } @Composable fun AlertDialogComponent() { }
49. How What // Classic Android val alertDialog = AlertDialog.Builder(context) .setTitle("Android Summit!”) .setMessage("Isn't this conference amazing?") // Somewhere else in code if (some_condition_is_met()) { alertDialog.show() } // Somewhere else in code if (some_other_condition_is_met()) { alertDialog.dismiss() } @Composable fun AlertDialogComponent() { if (some_condition_is_met()) { } }
50. How What // Classic Android val alertDialog = AlertDialog.Builder(context) .setTitle("Android Summit!”) .setMessage("Isn't this conference amazing?") // Somewhere else in code if (some_condition_is_met()) { alertDialog.show() } // Somewhere else in code if (some_other_condition_is_met()) { alertDialog.dismiss() } @Composable fun AlertDialogComponent() { if (some_condition_is_met()) { AlertDialog( title = { Text("Android Summit!") }, text = { Text(text = "Isn't this amazing?") } ) } }
51. State
52. @Composable fun AlertDialogComponent() { var showPopup by remember { mutableStateOf(false) } }
53. @Composable fun AlertDialogComponent() { var showPopup by remember { mutableStateOf(false) } Button(onClick = { showPopup = true }) { Text(text = "Click Me") } }
54. @Composable fun AlertDialogComponent() { var showPopup by remember { mutableStateOf(false) } Button(onClick = { showPopup = true }) { Text(text = "Click Me") } if (showPopup) { AlertDialog( onCloseRequest = { showPopup = false }, text = { Text("Congratulations! You just clicked the text successfully") }, confirmButton = { Button( onClick = onPopupDismissed ) { Text(text = "Ok") } } ) } }
55. @Composable fun AlertDialogComponent() { var showPopup by remember { mutableStateOf(false) } Button(onClick = { showPopup = true }) { Text(text = "Click Me") } if (showPopup) { AlertDialog( onCloseRequest = { showPopup = false }, text = { Text("Congratulations! You just clicked the text successfully") }, confirmButton = { Button( onClick = onPopupDismissed ) { Text(text = "Ok") } } ) } }
56. @Composable fun AlertDialogComponent() { var showPopup by remember { mutableStateOf(false) } if (!showPopup) { Button(onClick = { showPopup = true }) { Text(text = "Click Me") } } else { AlertDialog( onCloseRequest = { showPopup = false }, text = { Text("Congratulations! You just clicked the text successfully") }, confirmButton = { Button( onClick = onPopupDismissed ) { Text(text = "Ok") } } ) } }
57. Recomposition
58. Recompose / re·kuhm·powz / verb In an imperative UI model, to change a widget, you call a setter on the widget to change its internal state. In Compose, you call the composable function again with new data. Doing so causes the function to be recomposed--the widgets emitted by the function are redrawn, if necessary, with new data. The Compose framework can intelligently recompose only the components that changed.
59. (user: User) (name: String) (age: Int) (user: User) [counter: Int] (user: User) (imageURL: String) [scale: Float] (address: String)
60. (user: User) (name: String) (age: Int) (user: User) [counter: Int] (user: User) (imageURL: String) [scale: Float] (address: String)
61. (user: User) (name: String) (age: Int) (user: User) [counter: Int] (user: User) (imageURL: String) [scale: Float] (address: String)
62. (user: User) (name: String) (age: Int) (user: User) [counter: Int] (user: User) (imageURL: String) [scale: Float] (address: String)
63. (user: User) (name: String) (age: Int) (user: User) [counter: Int] (user: User) (imageURL: String) [scale: Float] (address: String)
64. (user: User) (name: String) (age: Int) (user: User) [counter: Int] (user: User) (imageURL: String) [scale: Float] (address: String)
65. Rules of Recomposition
66. Rules of Recomposition Some composable functions could be skipped Composable functions can be called frequently Composable functions can execute in any order Composable functions can run in parallel
67. @Composable fun ParentComposable() { "// Don’t write logic that always depends "// on the execution of all the composable Child1Composable() Child2Composable() Child3Composable() }
68. Rules of Recomposition Some composable functions could be skipped Composable functions can be called frequently Composable functions can execute in any order Composable functions can run in parallel
69. Rules of Recomposition Some composable functions could be skipped Composable functions can be called frequently Composable functions can execute in any order Composable functions can run in parallel
70. "// When this component is called from inside an animation, "// it will be called on every frame. @Composable fun ComponentCalledFromAnimation() { "// expensiveOperation takes 2 seconds to run val result = expensiveOperation() Text(result.message) }
71. "// When this component is called from inside an animation, "// it will be called on every frame. @Composable fun ComponentCalledFromAnimation() { "// expensiveOperation takes 2 seconds to run val result = expensiveOperation() Text(result.message) } launchInComposition
72. Rules of Recomposition Some composable functions could be skipped Composable functions can be called frequently Composable functions can execute in any order Composable functions can run in parallel
73. @Composable fun ParentComposable() { "// Can be called in any order Child1Composable() Child2Composable() Child3Composable() }
74. Rules of Recomposition Composable functions could be skipped Composable functions can be called frequently Composable functions can execute in any order Composable functions can run in parallel
75. Simple Layouts
77. Row
78. Row 1 2
79. 1 Column 1 Row 2
80. @Composable fun ImageWithTitleSubtitleComponent() { }
81. @Composable fun ImageWithTitleSubtitleComponent() { Row() { Column() { } } }
82. @Composable fun ImageWithTitleSubtitleComponent() { Row(modifier = Modifier.fillMaxWidth().padding(16.dp)) { Column(modifier = Modifier.padding(start = 16.dp)) { } } }
83. @Composable fun ImageWithTitleSubtitleComponent() { Row(modifier = Modifier.fillMaxWidth().padding(16.dp)) { DrawableImage(R.drawable.landscape) Column(modifier = Modifier.padding(start = 16.dp)) { CustomTextComponent(displayText = "Title") CustomTextComponent(displayText = "Subtitle") } } }
84. @Composable fun ImageWithTitleSubtitleComponent( title: String, subtitle: String, imageUrl: String ) { Row(modifier = Modifier.fillMaxWidth().padding(16.dp)) { NetworkImage(imageUrl) Column(modifier = Modifier.padding(start = 16.dp)) { CustomTextComponent(displayText = title) CustomTextComponent(displayText = subtitle) } } }
85. @Composable fun ImageWithTitleSubtitleComponent( title: String, subtitle: String, imageUrl: String ) { Row(modifier = Modifier.fillMaxWidth().padding(16.dp)) { NetworkImage(imageUrl) Column(modifier = Modifier.padding(start = 16.dp)) { CustomTextComponent(displayText = title) CustomTextComponent(displayText = subtitle) } } }
87. Display List
90. @Composable fun ListComponent(superheroList: List<Person>) { }
91. @Composable fun ListComponent(superheroList: List<Person>) { ScrollableColumn { for(person in superheroList) { SimpleRowComponent( person.name, person.age, person.profilePictureUrl ) } } }
92. www.JetpackCompose.app
93. @Composable fun ListComponent(superheroList: List<Person>) { }
94. @Composable fun ListComponent(superheroList: List<Person>) { LazyColumnFor(items = superheroList) { person "-> } }
95. @Composable fun ListComponent(superheroList: List<Person>) { LazyColumnFor(items = superheroList) { person "-> SimpleRowComponent( person.name, person.age, person.profilePictureUrl ) } }
96. @Composable fun ListComponent(superheroList: List<Person>) { LazyColumnFor(items = superheroList) { person "-> SimpleRowComponent( person.name, person.age, person.profilePictureUrl ) } }
97. Thank You Droid God, For this new day. I will rest in your promises(coroutines) of a world free of fragments. Guide me with compile-time checks and help me in every @SuppressWarnings that I add.
98. Click Gesture
99. @Composable fun SimpleRowComponent( titleText: String, subtitleText: String, imageUrl: String ) { Card( modifier = Modifier.fillMaxWidth() .padding(8.dp), shape = RoundedCornerShape(4.dp) ) { ""... ""... ""... } }
100. @Composable fun SimpleRowComponent( titleText: String, subtitleText: String, imageUrl: String, viewModel: SuperheroViewModel ) { Card( modifier = Modifier.fillMaxWidth() .padding(8.dp) .cl shape = RoundedCornerShape(4.dp) ) { .... .... } }
101. @Composable fun SimpleRowComponent( titleText: String, subtitleText: String, imageUrl: String, viewModel: SuperheroViewModel ) { Card( modifier = Modifier.fillMaxWidth() .padding(8.dp) .cl shape = RoundedCornerShape(4.dp) ) { .... .... } } clip clickable clipToBounds
102. @Composable fun SimpleRowComponent( titleText: String, subtitleText: String, imageUrl: String, viewModel: SuperheroViewModel ) { Card( modifier = Modifier.fillMaxWidth() .padding(8.dp) + .clickable { viewModel.updateSelectedSuperhero() }, shape = RoundedCornerShape(4.dp) ) { .... .... } }
103. @Composable fun SimpleRowComponent( titleText: String, subtitleText: String, imageUrl: String, viewModel: SuperheroViewModel ) { Card( modifier = Modifier.fillMaxWidth() .padding(8.dp) + .clickable { viewModel.updateSelectedSuperhero() }, shape = RoundedCornerShape(4.dp) ) { .... .... } }
104. @Composable fun SimpleRowComponent( titleText: String, subtitleText: String, imageUrl: String, onClick: () "-> Unit ) { Card( modifier = Modifier.fillMaxWidth() .padding(8.dp) .clickable { onClick() }, shape = RoundedCornerShape(4.dp) ) { .... .... } }
105. @Composable fun SimpleRowComponent( titleText: String, subtitleText: String, imageUrl: String, onClick: () "-> Unit ) { Card( modifier = Modifier.fillMaxWidth() .padding(8.dp) .clickable { onClick() }, shape = RoundedCornerShape(4.dp) ) { .... .... } }
106. Pinch-to-Zoom & Drag
107. @Composable fun ZoomableImageComponent(imageUrl: String) { }
108. @Composable fun ZoomableImageComponent(imageUrl: String) { var scale by state { 1f } var panOffset by state { Offset(0f, 0f) } }
109. @Composable fun ZoomableImageComponent(imageUrl: String) { var scale by state { 1f } var panOffset by state { Offset(0f, 0f) } Box(gravity = Alignment.Center) { NetworkImage( imageUrl = imageUrl, modifier = Modifier.fillMaxSize() ) } }
110. @Composable fun ZoomableImageComponent(imageUrl: String) { var scale by state { 1f } var panOffset by state { Offset(0f, 0f) } Box( gravity = Alignment.Center, modifier = Modifier.zoomable(onZoomDelta = { scale *= it }) ) { NetworkImage( imageUrl = imageUrl, modifier = Modifier.fillMaxSize().drawLayer( scaleX = scale, scaleY = scale ) ) } }
111. @Composable fun ZoomableImageComponent(imageUrl: String) { var scale by state { 1f } var panOffset by state { Offset(0f, 0f) } Box( gravity = Alignment.Center, modifier = Modifier.zoomable(onZoomDelta = { scale *= it }).rawDragGestureFilter( object : DragObserver { override fun onDrag(dragDistance: Offset): Offset { panOffset = panOffset.plus(dragDistance) return super.onDrag(dragDistance) } }) ) { NetworkImage( imageUrl = imageUrl, modifier = Modifier.fillMaxSize().drawLayer( scaleX = scale, scaleY = scale, translationX = panOffset.x, translationY = panOffset.y ) ) } }
112. @Composable fun ZoomableImageComponent(imageUrl: String) { var scale by state { 1f } var panOffset by state { Offset(0f, 0f) } Box( gravity = Alignment.Center, modifier = Modifier.zoomable(onZoomDelta = { scale *= it }).rawDragGestureFilter( object : DragObserver { override fun onDrag(dragDistance: Offset): Offset { panOffset = panOffset.plus(dragDistance) return super.onDrag(dragDistance) } }) ) { NetworkImage( imageUrl = imageUrl, modifier = Modifier.fillMaxSize().drawLayer( scaleX = scale, scaleY = scale, translationX = panOffset.x, translationY = panOffset.y ) ) } }
114. Compose in Classic Android
115. <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http:"//schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" "/> <androidx.compose.ui.platform.ComposeView android:id="@+id/compose_view" android:layout_width="wrap_content" android:layout_height="wrap_content" "/> "</LinearLayout> activity_compose_in_classic_android.xml
116. <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http:"//schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" "/> <androidx.compose.ui.platform.ComposeView android:id="@+id/compose_view" android:layout_width="wrap_content" android:layout_height="wrap_content" "/> "</LinearLayout> activity_compose_in_classic_android.xml
117. class ComposeInClassicAndroidActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_compose_in_classic_android) } }
118. class ComposeInClassicAndroidActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_compose_in_classic_android) val composeView = findViewById(R.id.compose_view) composeView.setContent { SimpleRowComponent() } } }
119. class ComposeInClassicAndroidActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_compose_in_classic_android) val composeView = findViewById(R.id.compose_view) composeView.setContent { SimpleRowComponent() } } }
120. Classic Android in Compose
121. @Composable fun ClassAndroidInComposeComponent() { }
122. @Composable fun ClassAndroidInComposeComponent() { val context = ContextAmbient.current val classicTextView = remember { TextView(context) } }
123. @Composable fun ClassAndroidInComposeComponent() { val context = ContextAmbient.current val classicTextView = remember { TextView(context) } AndroidView(viewBlock = { classicTextView }) { view "-> "// view is inflated here. Do anything if your logic requires it } }
124. ViewModel
125. @Composable fun MoviesComponent() { val viewModel: MoviesViewModel = viewModel() "// or val viewModel: MoviesViewModel = viewModel(ViewModelProvider.Factory) }
126. LiveData
127. @Composable fun MoviesComponent() { val viewModel: MoviesViewModel = viewModel() }
128. @Composable fun MoviesComponent() { val viewModel: MoviesViewModel = viewModel() val movieList = viewModel.movieListLiveData }
129. @Composable fun MoviesComponent() { val viewModel: MoviesViewModel = viewModel() val movieList = viewModel.movieListLiveData.observeAsState() }
130. @Composable fun MoviesComponent() { val viewModel: MoviesViewModel = viewModel() val movieList = viewModel.movieListLiveData.observeAsState() } ‘X’AsState()
131. Testing
132. @Composable fun SimpleRowComponent( titleText: String, subtitleText: String, imageUrl: String ) { Card( modifier = Modifier.fillMaxWidth() .padding(8.dp), shape = RoundedCornerShape(4.dp) ) { ""... ""... } }
133. @RunWith(JUnit4"::class) class SimpleRowComponentTest { }
134. @RunWith(JUnit4"::class) class SimpleRowComponentTest { @get:Rule val composeTestRule = createComposeRule(disableTransitions = true) }
135. @RunWith(JUnit4"::class) class SimpleRowComponentTest { @get:Rule val composeTestRule = createComposeRule(disableTransitions = true) @Before fun setUp() { composeTestRule.setContent { SimpleRowComponent( titleText = "Title", subtitleText = "Subtitle", imageUrl = "https:"//www.google.com/demo.jpg" ) } } }
136. @RunWith(JUnit4"::class) class SimpleRowComponentTest { @get:Rule val composeTestRule = createComposeRule(disableTransitions = true) @Before fun setUp() { composeTestRule.setContent { SimpleRowComponent( titleText = "Title", subtitleText = "Subtitle", imageUrl = "https:"//www.google.com/demo.jpg" ) } } @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title") } }
137. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title") }
138. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithSubstring("Ti") }
139. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithTag("TitleTag") }
140. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithTag("TitleTag") } "// In the component @Composable fun SimpleRowComponent(""...) { Card( modifier = Modifier.testTag("TitleTag") ) { ""... } }
141. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title") }
142. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title").assertIsDisplayed() }
143. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title").assertIsHidden() }
144. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title").assertHasClickAction() }
145. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title").assertHeightIsAtLeast(100.dp) }
146. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title").performClick() }
147. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title").performGesture { swipeDown() } }
148. @Test fun check_if_card_is_displayed() { composeTestRule.onNodeWithText("Title").assertIsDisplayed() }
149. Resources
150. Christmas came early"!!
151. https:"//bit.ly/ComposeByExample
152. https:"//www.JetpackCompose.app/
153. https:"//www.JetpackCompose.app/FAQ
154. https:"//www.JetpackCompose.app/Quick-Bites @vinaygaba
155. https:"//github.com/airbnb/Showkase
156. Learn Jetpack Compose by Example Vinay Gaba @vinaygaba https://bit.ly/ComposeByExample