Slide 1
Slide 1 text
No content
Slide 2
Slide 2 text
Why do we need
Jetpack Compose?
Slide 3
Slide 3 text
Why do I need to
learn new things?
UI Toolkit is tied to the OS
State Management is tricky
Lots of context switching
Simple things still require a lot of code
Slide 4
Slide 4 text
Why do I need to
learn new things?
UI Toolkit is tied to the OS
State Management is tricky
Lots of context switching
Simple things still require a lot of code
Slide 5
Slide 5 text
Why do I need to
learn new things?
UI Toolkit is tied to the OS
State Management is tricky
Lots of context switching
Simple things still require a lot of code
Slide 6
Slide 6 text
Why do I need to
learn new things?
UI Toolkit is tied to the OS
State Management is tricky
Lots of context switching
Simple things still require a lot of code
Slide 7
Slide 7 text
Why do I need to
learn new things?
UI Toolkit is tied to the OS
State Management is tricky
Lots of context switching
Simple things still require a lot of code
Slide 8
Slide 8 text
Examples
Slide 9
Slide 9 text
Disclaimer
Examples are based on 0.1.0-dev14 version
Compose is still pre-alpha so things are constantly changing and
will continue to do so
Alpha release is expected in the next few months
Slide 10
Slide 10 text
Disclaimer
Examples are based on 0.1.0-dev14 version
Compose is still pre-alpha so things are constantly changing and
will continue to do so
Alpha release is expected in the next few months
Slide 11
Slide 11 text
Disclaimer
Examples are based on 0.1.0-dev14 version
Compose is still pre-alpha so things are constantly changing and
will continue to do so
Alpha release is expected in the next few months
Slide 12
Slide 12 text
Disclaimer
Examples are based on 0.1.0-dev14 version
Compose is still pre-alpha so things are constantly changing and
will continue to do so
Alpha release is expected in the next few months
Slide 13
Slide 13 text
Example: Hello World
Slide 14
Slide 14 text
class HelloWorldActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
}
Slide 15
Slide 15 text
class HelloWorldActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
}
}
}
Slide 16
Slide 16 text
fun ComponentActivity.setContent(
recomposer: Recomposer = Recomposer.current(),
content: @Composable () -> Unit
): Composition {
// Some magic ✨
}
Slide 17
Slide 17 text
class HelloWorldActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
}
}
}
Slide 18
Slide 18 text
class HelloWorldActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
Text(text = "Hello World")
}
}
}
Slide 19
Slide 19 text
class HelloWorldActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
Text(text = "Hello World")
}
}
}
Slide 20
Slide 20 text
class HelloWorldActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
Text(text = "Hello World")
}
}
}
Slide 21
Slide 21 text
@Composable
fun CustomTextComponent() {
Text(text = "Hello World")
}
Slide 22
Slide 22 text
@Composable
fun CustomTextComponent(displayText: String) {
Text(
text = displayText,
style = TextStyle(
fontSize = 18.sp,
fontFamily = FontFamily.Monospace
)
)
}
Slide 23
Slide 23 text
@Composable
fun CustomTextComponent(displayText: String) {
Text(
text = displayText,
style = TextStyle(
fontSize = 18.sp,
fontFamily = FontFamily.Monospace
)
)
}
Slide 24
Slide 24 text
@Composable
fun CustomTextComponent(displayText: String) {
Text(
text = displayText,
style = TextStyle(
fontSize = 18.sp,
fontFamily = FontFamily.Monospace
)
)
}
@Preview
@Composable
fun CustomTextComponentPreview() {
CustomTextComponent("Hello World")
}
Slide 25
Slide 25 text
No content
Slide 26
Slide 26 text
No content
Slide 27
Slide 27 text
Example: Show an Image
Slide 28
Slide 28 text
@Composable
fun DrawableImage() {
}
Slide 29
Slide 29 text
@Composable
fun DrawableImage() {
val image = loadImageResource(R.drawable.lena)
}
Slide 30
Slide 30 text
@Composable
fun DrawableImage() {
val image = loadImageResource(R.drawable.lena)
image.resource.resource?.let {
Image(asset = it, modifier = Modifier.preferredSize(200.dp))
}
}
Slide 31
Slide 31 text
@Composable
fun DrawableImage(@DrawableRes resId: Int) {
val image = loadImageResource(resId)
image.resource.resource?.let {
Image(asset = it, modifier = Modifier.preferredSize(200.dp))
}
}
Slide 32
Slide 32 text
@Composable
fun DrawableImage(@DrawableRes resId: Int) {
val image = loadImageResource(resId)
image.resource.resource?.let {
Image(asset = it, modifier = Modifier.preferredSize(200.dp))
}
}
Slide 33
Slide 33 text
Example: Alert Dialog
Slide 34
Slide 34 text
// Classic Android
AlertDialog.Builder(context)
.setTitle("360|AnDev")
.setMessage("Isn't this conference amazing?")
.setPositiveButton(android.R.string.yes, null)
.setNegativeButton(android.R.string.no, null)
.setIcon(android.R.drawable.ic_dialog_alert)
.show()
Slide 35
Slide 35 text
@Composable
fun AlertDialogComponent() {
}
Slide 36
Slide 36 text
@Composable
fun AlertDialogComponent() {
var showPopup by state { false }
}
Slide 37
Slide 37 text
@Composable
fun AlertDialogComponent() {
var showPopup by state { false }
Button(onClick = { showPopup = true }, backgroundColor = Color.DarkGray) {
Text(text = "Click Me")
}
}
Slide 38
Slide 38 text
@Composable
fun AlertDialogComponent() {
var showPopup by state { false }
Button(onClick = { showPopup = true }, backgroundColor = Color.DarkGray) {
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")
}
}
)
}
}
Slide 39
Slide 39 text
@Composable
fun AlertDialogComponent() {
var showPopup by state { false }
Button(onClick = { showPopup = true }, backgroundColor = Color.DarkGray) {
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")
}
}
)
}
}
Slide 40
Slide 40 text
@Composable
fun AlertDialogComponent() {
var showPopup by remember { mutableStateOf(false) }
val onButtonClicked = { showPopup = true }
val onPopupDismissed = { showPopup = false }
if (!showPopup) {
Button(onClick = onButtonClicked, backgroundColor = Color.DarkGray) {
Text(text = "Click Me")
}
} else {
AlertDialog(
onCloseRequest = onPopupDismissed,
text = {
Text("Congratulations! You just clicked the text successfully")
},
confirmButton = {
Button(
onClick = onPopupDismissed
) {
Text(text = "Ok")
}
}
)
}
}
Slide 41
Slide 41 text
Example: Simple Layouts
Slide 42
Slide 42 text
No content
Slide 43
Slide 43 text
Row
Slide 44
Slide 44 text
Row
1 2
Slide 45
Slide 45 text
1
Column
1
Row
2
Slide 46
Slide 46 text
@Composable
fun ImageWithTitleSubtitleComponent() {
}
Slide 47
Slide 47 text
@Composable
fun ImageWithTitleSubtitleComponent() {
Row() {
Column() {
}
}
}
Slide 48
Slide 48 text
@Composable
fun ImageWithTitleSubtitleComponent() {
Row(modifier = Modifier.fillMaxWidth() + Modifier.padding(16.dp)) {
Column(modifier = Modifier.padding(start = 16.dp)) {
}
}
}
Slide 49
Slide 49 text
@Composable
fun ImageWithTitleSubtitleComponent() {
Row(modifier = Modifier.fillMaxWidth() + Modifier.padding(16.dp)) {
DrawableImage(R.drawable.lenna)
Column(modifier = Modifier.padding(start = 16.dp)) {
CustomTextComponent(displayText = "Title")
CustomTextComponent(displayText = "Subtitle")
}
}
}
Slide 50
Slide 50 text
@Composable
fun ImageWithTitleSubtitleComponent(title: String, subtitle: String, imageUrl: String) {
Row(modifier = Modifier.fillMaxWidth() + Modifier.padding(16.dp)) {
NetworkImage(imageUrl)
Column(modifier = Modifier.padding(start = 16.dp)) {
CustomTextComponent(displayText = title)
CustomTextComponent(displayText = subtitle)
}
}
}
Slide 51
Slide 51 text
@Composable
fun ImageWithTitleSubtitleComponent(title: String, subtitle: String, imageUrl: String) {
Row(modifier = Modifier.fillMaxWidth() + Modifier.padding(16.dp)) {
NetworkImage(imageUrl)
Column(modifier = Modifier.padding(start = 16.dp)) {
CustomTextComponent(displayText = title)
CustomTextComponent(displayText = subtitle)
}
}
}
Slide 52
Slide 52 text
Example: ConstraintLayout
Slide 53
Slide 53 text
@Composable
fun SimpleRowComponent(titleText: String, subtitleText: String, imageUrl: String) {
}
Slide 54
Slide 54 text
@Composable
fun SimpleRowComponent(titleText: String, subtitleText: String, imageUrl: String) {
ConstraintLayout {
val (title, subtitle, image) = createRefs()
}
}
Slide 55
Slide 55 text
@Composable
fun SimpleRowComponent(titleText: String, subtitleText: String, imageUrl: String) {
ConstraintLayout {
val (title, subtitle, image) = createRefs()
CustomTextComponent(
displayText = titleText,
)
CustomTextComponent(
displayText = subtitleText,
)
NetworkImage(
url = imageUrl,
)
}
}
Slide 56
Slide 56 text
@Composable
fun SimpleRowComponent(titleText: String, subtitleText: String, imageUrl: String) {
ConstraintLayout {
val (title, subtitle, image) = createRefs()
CustomTextComponent(
displayText = titleText,
modifier = Modifier.constrainAs(title) {
start.linkTo(image.end, margin = 8.dp)
top.linkTo(image.top)
}
)
CustomTextComponent(
displayText = subtitleText,
)
NetworkImage(
url = imageUrl,
)
}
}
Slide 57
Slide 57 text
@Composable
fun SimpleRowComponent(titleText: String, subtitleText: String, imageUrl: String) {
ConstraintLayout {
val (title, subtitle, image) = createRefs()
CustomTextComponent(
displayText = titleText,
modifier = Modifier.constrainAs(title) {
start.linkTo(image.end, margin = 8.dp)
top.linkTo(image.top)
}
)
CustomTextComponent(
displayText = subtitleText,
modifier = Modifier.constrainAs(subtitle) {
bottom.linkTo(image.bottom)
start.linkTo(image.end, margin = 8.dp)
}
)
NetworkImage(
url = imageUrl,
modifier = Modifier.constrainAs(image) {
centerVerticallyTo(parent)
start.linkTo(parent.start, margin = 16.dp)
top.linkTo(parent.top, margin = 16.dp)
bottom.linkTo(parent.bottom, margin = 16.dp)
}
)
}
}
Slide 58
Slide 58 text
@Composable
fun SimpleRowComponent(titleText: String, subtitleText: String, imageUrl: String) {
Card(
modifier = Modifier.fillMaxWidth() + Modifier.padding(8.dp),
shape = RoundedCornerShape(4.dp)
) {
ConstraintLayout {
val (title, subtitle, image) = createRefs()
CustomTextComponent(
displayText = titleText,
modifier = Modifier.constrainAs(title) {
start.linkTo(image.end, margin = 8.dp)
top.linkTo(image.top)
}
)
CustomTextComponent(
displayText = subtitleText,
modifier = Modifier.constrainAs(subtitle) {
bottom.linkTo(image.bottom)
start.linkTo(image.end, margin = 8.dp)
}
)
NetworkImage(
url = imageUrl,
modifier = Modifier.constrainAs(image) {
centerVerticallyTo(parent)
start.linkTo(parent.start, margin = 16.dp)
top.linkTo(parent.top, margin = 16.dp)
bottom.linkTo(parent.bottom, margin = 16.dp)
})
}
}
}
Slide 59
Slide 59 text
@Composable
fun SimpleRowComponent(titleText: String, subtitleText: String, imageUrl: String) {
Card(
modifier = Modifier.fillMaxWidth() + Modifier.padding(8.dp),
shape = RoundedCornerShape(4.dp)
) {
ConstraintLayout {
val (title, subtitle, image) = createRefs()
CustomTextComponent(
displayText = titleText,
modifier = Modifier.constrainAs(title) {
start.linkTo(image.end, margin = 8.dp)
top.linkTo(image.top)
}
)
CustomTextComponent(
displayText = subtitleText,
modifier = Modifier.constrainAs(subtitle) {
bottom.linkTo(image.bottom)
start.linkTo(image.end, margin = 8.dp)
}
)
NetworkImage(
url = imageUrl,
modifier = Modifier.constrainAs(image) {
centerVerticallyTo(parent)
start.linkTo(parent.start, margin = 16.dp)
top.linkTo(parent.top, margin = 16.dp)
bottom.linkTo(parent.bottom, margin = 16.dp)
})
}
}
}
Slide 60
Slide 60 text
No content
Slide 61
Slide 61 text
Example: List
Slide 62
Slide 62 text
No content
Slide 63
Slide 63 text
No content
Slide 64
Slide 64 text
www.JetpackCompose.app
Slide 65
Slide 65 text
@Composable
fun ListComponent(superheroList: List) {
}
Slide 66
Slide 66 text
@Composable
fun ListComponent(superheroList: List) {
LazyColumnItems(items = superheroList) { person ->
}
}
Slide 67
Slide 67 text
@Composable
fun ListComponent(superheroList: List) {
LazyColumnItems(items = superheroList) { person ->
SimpleRowComponent(
person.name,
person.age,
person.profilePictureUrl
)
}
}
Slide 68
Slide 68 text
@Composable
fun ListComponent(superheroList: List) {
LazyColumnItems(items = superheroList) { person ->
SimpleRowComponent(
person.name,
person.age,
person.profilePictureUrl
)
}
}
Slide 69
Slide 69 text
Example: Click
Slide 70
Slide 70 text
@Composable
fun SimpleRowComponent(
titleText: String,
subtitleText: String,
imageUrl: String
) {
Card(
modifier = Modifier.fillMaxWidth() +
Modifier.padding(8.dp),
shape = RoundedCornerShape(4.dp)
) {
....
....
}
}
Slide 71
Slide 71 text
@Composable
fun SimpleRowComponent(
titleText: String,
subtitleText: String,
imageUrl: String,
viewModel: SuperheroViewModel
) {
Card(
modifier = Modifier.fillMaxWidth() +
Modifier.padding(8.dp) +
Modifier.cl
shape = RoundedCornerShape(4.dp)
) {
....
....
}
}
Slide 72
Slide 72 text
@Composable
fun SimpleRowComponent(
titleText: String,
subtitleText: String,
imageUrl: String,
viewModel: SuperheroViewModel
) {
Card(
modifier = Modifier.fillMaxWidth() +
Modifier.padding(8.dp) +
Modifier.cl
shape = RoundedCornerShape(4.dp)
) {
....
....
}
}
clip
clickable
clipToBounds
Slide 73
Slide 73 text
@Composable
fun SimpleRowComponent(
titleText: String,
subtitleText: String,
imageUrl: String,
viewModel: SuperheroViewModel
) {
Card(
modifier = Modifier.fillMaxWidth() +
Modifier.padding(8.dp) +
Modifier.clickable {
viewModel.updateSelectedSuperhero()
},
shape = RoundedCornerShape(4.dp)
) {
....
....
}
}
Slide 74
Slide 74 text
@Composable
fun SimpleRowComponent(
titleText: String,
subtitleText: String,
imageUrl: String,
viewModel: SuperheroViewModel
) {
Card(
modifier = Modifier.fillMaxWidth() +
Modifier.padding(8.dp) +
Modifier.clickable {
viewModel.updateSelectedSuperhero()
},
shape = RoundedCornerShape(4.dp)
) {
....
....
}
}
Slide 75
Slide 75 text
@Composable
fun SimpleRowComponent(
titleText: String,
subtitleText: String,
imageUrl: String,
onClick: () -> Unit
) {
Card(
modifier = Modifier.fillMaxWidth() +
Modifier.padding(8.dp) +
Modifier.clickable {
onClick()
},
shape = RoundedCornerShape(4.dp)
) {
....
....
}
}
Slide 76
Slide 76 text
@Composable
fun SimpleRowComponent(
titleText: String,
subtitleText: String,
imageUrl: String,
onClick: () -> Unit
) {
Card(
modifier = Modifier.fillMaxWidth() +
Modifier.padding(8.dp) +
Modifier.clickable {
onClick()
},
shape = RoundedCornerShape(4.dp)
) {
....
....
}
}
Slide 77
Slide 77 text
Example: Pinch-to-Zoom &
Drag
Slide 78
Slide 78 text
@Composable
fun ZoomableImageComponent(imageUrl: String) {
}
Slide 79
Slide 79 text
@Composable
fun ZoomableImageComponent(imageUrl: String) {
var scale by state { 1f }
var panOffset by state { Offset(0f, 0f) }
}
Slide 80
Slide 80 text
@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()
)
}
}
Slide 81
Slide 81 text
@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() + Modifier.drawLayer(
scaleX = scale,
scaleY = scale
)
)
}
}
Slide 82
Slide 82 text
@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 }) + Modifier.rawDragGestureFilter(
object : DragObserver {
override fun onDrag(dragDistance: Offset): Offset {
panOffset = panOffset.plus(dragDistance)
return super.onDrag(dragDistance)
}
})
) {
NetworkImage(
imageUrl = imageUrl,
modifier = Modifier.fillMaxSize() + Modifier.drawLayer(
scaleX = scale,
scaleY = scale,
translationX = panOffset.x,
translationY = panOffset.y
)
)
}
}
Slide 83
Slide 83 text
@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 }) + Modifier.rawDragGestureFilter(
object : DragObserver {
override fun onDrag(dragDistance: Offset): Offset {
panOffset = panOffset.plus(dragDistance)
return super.onDrag(dragDistance)
}
})
) {
NetworkImage(
imageUrl = imageUrl,
modifier = Modifier.fillMaxSize() + Modifier.drawLayer(
scaleX = scale,
scaleY = scale,
translationX = panOffset.x,
translationY = panOffset.y
)
)
}
}
Slide 84
Slide 84 text
Interoperability
Slide 85
Slide 85 text
Example: Compose in
Classic Android
Slide 86
Slide 86 text
class ComposeInClassicAndroidActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_compose_in_classic_android)
}
}
Slide 87
Slide 87 text
class ComposeInClassicAndroidActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_compose_in_classic_android)
val containerLayout = findViewById(R.id.frame_container)
containerLayout.setContent(Recomposer.current()) {
SimpleRowComponent()
}
}
}
Slide 88
Slide 88 text
class ComposeInClassicAndroidActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_compose_in_classic_android)
val containerLayout = findViewById(R.id.frame_container)
containerLayout.setContent(Recomposer.current()) {
SimpleRowComponent()
}
}
}
Slide 89
Slide 89 text
Example: Classic Android in
Compose
Slide 90
Slide 90 text
credit_card.xml
Slide 91
Slide 91 text
@Composable
fun AndroidInCompose() {
AndroidView(R.layout.credit_card, modifier = Modifier.padding(16.dp))
}
Slide 92
Slide 92 text
Resources
Slide 93
Slide 93 text
https://bit.ly/ComposeByExample
Slide 94
Slide 94 text
https://www.JetpackCompose.app/
Slide 95
Slide 95 text
No content