Compose में मटीरियल 2 से मटीरियल 3 पर माइग्रेट करना

implementation "androidx.compose.material:material:$m2-version"

implementation "androidx.compose.material3:material3:$m3-version"

import androidx.compose.material.MaterialTheme

MaterialTheme(
    colors = AppColors,
    typography = AppTypography,
    shapes = AppShapes
) {
    // M2 content
}

import androidx.compose.material3.MaterialTheme

MaterialTheme(
    colorScheme = AppColorScheme,
    typography = AppTypography,
    shapes = AppShapes
) {
    // M3 content
}

import androidx.compose.material.lightColors
import androidx.compose.material.darkColors

val AppLightColors = lightColors(
    // M2 light Color parameters
)
val AppDarkColors = darkColors(
    // M2 dark Color parameters
)
val AppColors = if (darkTheme) {
    AppDarkColors
} else {
    AppLightColors
}

import androidx.compose.material3.lightColorScheme
import androidx.compose.material3.darkColorScheme

val AppLightColorScheme = lightColorScheme(
    // M3 light Color parameters
)
val AppDarkColorScheme = darkColorScheme(
    // M3 dark Color parameters
)
val AppColorScheme = if (darkTheme) {
    AppDarkColorScheme
} else {
    AppLightColorScheme
}

import androidx.compose.material.lightColors
import androidx.compose.material.darkColors
import androidx.compose.material.MaterialTheme

@Composable
private fun AppTheme(
  darkTheme: Boolean = isSystemInDarkTheme(),
  content: @Composable () -> Unit
) {
  val colors = if (darkTheme) darkColors(…) else lightColors(…)
  MaterialTheme(
      colors = colors,
      content = content
  )
}

@Composable
fun AppComposable() {
    AppTheme {
        val cardElevation = if (MaterialTheme.colors.isLight) 0.dp else 4.dp
        …
    }
}

import androidx.compose.material3.lightColorScheme
import androidx.compose.material3.darkColorScheme
import androidx.compose.material3.MaterialTheme

val LocalCardElevation = staticCompositionLocalOf { Dp.Unspecified }
@Composable
private fun AppTheme(
   darkTheme: Boolean = isSystemInDarkTheme(),
    content: @Composable () -> Unit
) {
   val cardElevation = if (darkTheme) 4.dp else 0.dp
    CompositionLocalProvider(LocalCardElevation provides cardElevation) {
        val colorScheme = if (darkTheme) darkColorScheme(…) else lightColorScheme(…)
        MaterialTheme(
            colorScheme = colorScheme,
            content = content
        )
    }
}

@Composable
fun AppComposable() {
    AppTheme {
        val cardElevation = LocalCardElevation.current
        …
    }
}

import androidx.compose.material.Typography

val AppTypography = Typography(
    // M2 TextStyle parameters
)

import androidx.compose.material3.Typography

val AppTypography = Typography(
    // M3 TextStyle parameters
)

import androidx.compose.material.Shapes

val AppShapes = Shapes(
    // M2 Shape parameters
)

import androidx.compose.material3.Shapes

val AppShapes = Shapes(
    // M3 Shape parameters
)

import androidx.compose.material.Scaffold

Scaffold(
    // M2 scaffold parameters
)

import androidx.compose.material3.Scaffold

Scaffold(
    // M3 scaffold parameters
)

import androidx.compose.material.Scaffold

Scaffold(
    backgroundColor = …,
    content = { … }
)

import androidx.compose.material3.Scaffold

Scaffold(
    containerColor = …,
    content = { … }
)

import androidx.compose.material.Scaffold
import androidx.compose.material.rememberScaffoldState

val scaffoldState = rememberScaffoldState()
val scope = rememberCoroutineScope()

Scaffold(
    scaffoldState = scaffoldState,
    content = {
        …
        scope.launch {
            scaffoldState.snackbarHostState.showSnackbar(…)
        }
    }
)

import androidx.compose.material3.Scaffold
import androidx.compose.material3.SnackbarHost
import androidx.compose.material3.SnackbarHostState

val snackbarHostState = remember { SnackbarHostState() }
val scope = rememberCoroutineScope()

Scaffold(
    snackbarHost = { SnackbarHost(snackbarHostState) },
    content = {
        …
        scope.launch {
            snackbarHostState.showSnackbar(…)
        }
    }
)

import androidx.compose.material.DrawerValue
import
import androidx.compose.material.Scaffold
import androidx.compose.material.rememberDrawerState
import androidx.compose.material.rememberScaffoldState

val scaffoldState = rememberScaffoldState(
    drawerState = rememberDrawerState(DrawerValue.Closed)
)
val scope = rememberCoroutineScope()

Scaffold(
    scaffoldState = scaffoldState,
    drawerContent = { … },
    drawerGesturesEnabled = …,
    drawerShape = …,
    drawerElevation = …,
    drawerBackgroundColor = …,
    drawerContentColor = …,
    drawerScrimColor = …,
    content = {
        …
        scope.launch {
            scaffoldState.drawerState.open()
        }
    }
)

import androidx.compose.material3.DrawerValue
import androidx.compose.material3.ModalDrawerSheet
import androidx.compose.material3.ModalNavigationDrawer
import androidx.compose.material3.Scaffold
import androidx.compose.material3.rememberDrawerState

val drawerState = rememberDrawerState(DrawerValue.Closed)
val scope = rememberCoroutineScope()

ModalNavigationDrawer(
    drawerState = drawerState,
    drawerContent = {
        ModalDrawerSheet(
            drawerShape = …,
            drawerTonalElevation = …,
            drawerContainerColor = …,
            drawerContentColor = …,
            content = { … }
        )
    },
    gesturesEnabled = …,
    scrimColor = …,
    content = {
        Scaffold(
            content = {
                …
                scope.launch {
                    drawerState.open()
                }
            }
        )
    }
)

import androidx.compose.material.TopAppBar

TopAppBar(…)

import androidx.compose.material3.TopAppBar

TopAppBar(…)

import androidx.compose.material.AppBarDefaults
import androidx.compose.material.Scaffold
import androidx.compose.material.TopAppBar

val state = rememberLazyListState()
val isAtTop by remember {
    derivedStateOf {
        state.firstVisibleItemIndex == 0 && state.firstVisibleItemScrollOffset == 0
    }
}

Scaffold(
    topBar = {
        TopAppBar(
            elevation = if (isAtTop) {
                0.dp
            } else {
                AppBarDefaults.TopAppBarElevation
            },
            …
        )
    },
    content = {
        LazyColumn(state = state) { … }
    }
)

import androidx.compose.material3.Scaffold
import androidx.compose.material3.TopAppBar
import androidx.compose.material3.TopAppBarDefaults

val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()

Scaffold(
    modifier = Modifier.nestedScroll(scrollBehavior.nestedScrollConnection),
    topBar = {
        TopAppBar(
            scrollBehavior = scrollBehavior,
            …
        )
    },
    content = {
        LazyColumn { … }
    }
)

import androidx.compose.material.BottomNavigation
import androidx.compose.material.BottomNavigationItem

BottomNavigation {
    BottomNavigationItem(…)
    BottomNavigationItem(…)
    BottomNavigationItem(…)
}

import androidx.compose.material3.NavigationBar
import androidx.compose.material3.NavigationBarItem

NavigationBar {
    NavigationBarItem(…)
    NavigationBarItem(…)
    NavigationBarItem(…)
}

import androidx.compose.material.Button
import androidx.compose.material.ExtendedFloatingActionButton
import androidx.compose.material.FloatingActionButton
import androidx.compose.material.IconButton
import androidx.compose.material.IconToggleButton
import androidx.compose.material.OutlinedButton
import androidx.compose.material.TextButton

// M2 buttons
Button(…)
OutlinedButton(…)
TextButton(…)
// M2 icon buttons
IconButton(…)
IconToggleButton(…)
// M2 FABs
FloatingActionButton(…)
ExtendedFloatingActionButton(…)

import androidx.compose.material3.Button
import androidx.compose.material3.ExtendedFloatingActionButton
import androidx.compose.material3.FloatingActionButton
import androidx.compose.material3.IconButton
import androidx.compose.material3.IconToggleButton
import androidx.compose.material3.OutlinedButton
import androidx.compose.material3.TextButton

// M3 buttons
Button(…)
OutlinedButton(…)
TextButton(…)
// M3 icon buttons
IconButton(…)
IconToggleButton(…)
// M3 FABs
FloatingActionButton(…)
ExtendedFloatingActionButton(…)

import androidx.compose.material.Switch

Switch(…)

import androidx.compose.material3.Switch

Switch(…)

import androidx.compose.material.Surface

Surface(
    elevation = …
) { … }

import androidx.compose.material3.Surface

Surface(
    shadowElevation = …,
    tonalElevation = …
) { … }

import androidx.compose.material.ContentAlpha
import androidx.compose.material.LocalContentAlpha

// High emphasis
CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.high) {
    Icon(…)
}
// Medium emphasis
CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
    Icon(…)
}
// Disabled emphasis
CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.disabled) {
    Icon(…)
}

import androidx.compose.material3.LocalContentColor

// High emphasis
CompositionLocalProvider(LocalContentColor provides MaterialTheme.colorScheme.onSurface) {
    Icon(…)
}
// Medium emphasis
CompositionLocalProvider(LocalContentColor provides MaterialTheme.colorScheme.onSurfaceVariant) {
    Icon(…)
}
// Disabled emphasis
CompositionLocalProvider(LocalContentColor provides MaterialTheme.colorScheme.onSurface.copy(alpha = 0.38f)) {
    Icon(…)
}

import androidx.compose.material.ContentAlpha
import androidx.compose.material.LocalContentAlpha

// High emphasis
CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.high) {
    Text(…)
}
// Medium emphasis
CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
    Text(…)
}
// Disabled emphasis
CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.disabled) {
    Text(…)
}

import androidx.compose.material3.LocalContentColor

// High emphasis
Text(
    …,
    fontWeight = FontWeight.Bold
)
// Medium emphasis
Text(
    …,
    fontWeight = FontWeight.Normal
)
// Disabled emphasis
CompositionLocalProvider(LocalContentColor provides MaterialTheme.colorScheme.onSurface.copy(alpha = 0.38f)) {
    Text(
        …,
        fontWeight = FontWeight.Normal
    )
}

Badge(
    backgroundColor = MaterialTheme.colors.primary
) { … }

Badge(
    containerColor = MaterialTheme.colorScheme.primary
) { … }