安卓软件开发:Jetpack Compose中常见的核心概念总结-7

val pagerState = rememberPagerState()

HorizontalPager(
    count = 5,
    state = pagerState
) { page ->
    Text("Page: $page", modifier = Modifier.fillMaxSize())
}

VerticalPager(
    count = 5,
    state = rememberPagerState()
) { page ->
    Text("Page: $page", modifier = Modifier.fillMaxSize())
}

var toggled by remember { mutableStateOf(false) }

IconToggleButton(
    checked = toggled,
    onCheckedChange = { toggled = !toggled }
) {
    Icon(
        imageVector = if (toggled) Icons.Default.Favorite else Icons.Default.FavoriteBorder,
        contentDescription = "Favorite"
    )
}

Icon(Icons.Filled.Home, contentDescription = "Home")

Image(
    painter = painterResource(id = R.drawable.sample_image),
    contentDescription = "Sample Image",
    modifier = Modifier.size(100.dp)
)

Canvas(modifier = Modifier.size(100.dp)) {
    drawCircle(Color.Red, radius = size.minDimension / 2)
}

Text(
    "Draw Behind Example",
    modifier = Modifier
        .padding(16.dp)
        .drawBehind {
            drawRect(Color.Yellow)
        }
)

val viewModel: MyViewModel = viewModel()

viewModel.data.observeAsState().value?.let { data ->
    Text("Data: $data")
}

val scaffoldState = rememberScaffoldState()

Scaffold(
    scaffoldState = scaffoldState
) {
    Button(onClick = {
        scaffoldState.snackbarHostState.showSnackbar("Hello Snackbar")
    }) {
        Text("Show Snackbar")
    }
}

Toast.makeText(context, "Hello, World!", Toast.LENGTH_SHORT).show()