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basic-android-kotlin-compose-training-cupcake
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Completed Tutorial :)

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devoalda 2024-01-31 22:02:16 +08:00
parent 4b6bf04748
commit 22922b27de
4 changed files with 148 additions and 20 deletions
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134
app/src/main/java/com/example/cupcake/CupcakeScreen.kt
View File

@ -15,39 +15,59 @@
*/
package com.example.cupcake
import android.content.Context
import android.content.Intent
import androidx.annotation.StringRes
import androidx.compose.foundation.layout.fillMaxHeight
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ArrowBack
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.material3.TopAppBarDefaults
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.dimensionResource
import androidx.compose.ui.res.stringResource
import androidx.lifecycle.viewmodel.compose.viewModel
import androidx.navigation.NavHostController
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.currentBackStackEntryAsState
import androidx.navigation.compose.rememberNavController
import com.example.cupcake.data.DataSource
import com.example.cupcake.ui.OrderSummaryScreen
import com.example.cupcake.ui.OrderViewModel
import com.example.cupcake.ui.SelectOptionScreen
import com.example.cupcake.ui.StartOrderScreen
enum class CupcakeScreen(@StringRes val title: Int) {
Start(title = R.string.app_name),
Flavor(title = R.string.choose_flavor),
Pickup(title = R.string.choose_pickup_date),
Summary(title = R.string.order_summary)
}
/**
* Composable that displays the topBar and displays back button if back navigation is possible.
*/
@Composable
fun CupcakeAppBar(
currentScreen: CupcakeScreen,
canNavigateBack: Boolean,
navigateUp: () -> Unit,
navigateUp: () -> Unit = {},
modifier: Modifier = Modifier
) {
TopAppBar(
title = { Text(stringResource(id = R.string.app_name)) },
colors = TopAppBarDefaults.mediumTopAppBarColors(
containerColor = MaterialTheme.colorScheme.primaryContainer
),
title = { Text(stringResource(currentScreen.title)) },
modifier = modifier,
navigationIcon = {
if (canNavigateBack) {
@ -60,6 +80,7 @@ fun CupcakeAppBar(
}
}
)
}
@Composable
@ -67,16 +88,111 @@ fun CupcakeApp(
viewModel: OrderViewModel = viewModel(),
navController: NavHostController = rememberNavController()
) {
val backStackEntry by navController.currentBackStackEntryAsState()
val currentScreen = CupcakeScreen.valueOf(
backStackEntry?.destination?.route ?: CupcakeScreen.Start.name
)
Scaffold(
topBar = {
CupcakeAppBar(
canNavigateBack = false,
navigateUp = { /* TODO: implement back navigation */ }
currentScreen = currentScreen,
canNavigateBack = navController.previousBackStackEntry != null,
navigateUp = { navController.navigateUp() }
)
}
) { innerPadding ->
val uiState by viewModel.uiState.collectAsState()
NavHost(
navController = navController,
startDestination = CupcakeScreen.Start.name,
modifier = Modifier.padding(innerPadding)
) {
composable(route = CupcakeScreen.Start.name) {
StartOrderScreen(
quantityOptions = DataSource.quantityOptions,
onNextButtonClicked = {
viewModel.setQuantity(it)
navController.navigate(CupcakeScreen.Flavor.name)
},
modifier = Modifier
.fillMaxSize()
.padding(dimensionResource(R.dimen.padding_medium))
)
}
composable(route = CupcakeScreen.Flavor.name) {
val context = LocalContext.current
SelectOptionScreen(
subtotal = uiState.price,
onNextButtonClicked = { navController.navigate(CupcakeScreen.Pickup.name) },
onCancelButtonClicked = {
cancelOrderAndNavigateToStart(viewModel, navController)
},
options = DataSource.flavors.map { id -> context.resources.getString(id) },
onSelectionChanged = { viewModel.setFlavor(it) },
modifier = Modifier.fillMaxHeight()
)
}
composable(route = CupcakeScreen.Pickup.name) {
SelectOptionScreen(
subtotal = uiState.price,
onNextButtonClicked = { navController.navigate(CupcakeScreen.Summary.name) },
onCancelButtonClicked = {
cancelOrderAndNavigateToStart(viewModel, navController)
},
options = uiState.pickupOptions,
onSelectionChanged = { viewModel.setDate(it) },
modifier = Modifier.fillMaxHeight()
)
}
composable(route = CupcakeScreen.Summary.name) {
val context = LocalContext.current
OrderSummaryScreen(
orderUiState = uiState,
onCancelButtonClicked = {
cancelOrderAndNavigateToStart(viewModel, navController)
},
onSendButtonClicked = { subject: String, summary: String ->
shareOrder(context, subject = subject, summary = summary)
},
modifier = Modifier.fillMaxHeight()
)
}
}
}
}
private fun shareOrder(context: Context, subject: String, summary: String) {
val intent = Intent(Intent.ACTION_SEND).apply {
type = "text/plain"
putExtra(Intent.EXTRA_SUBJECT, subject)
putExtra(Intent.EXTRA_TEXT, summary)
}
context.startActivity(
Intent.createChooser(
intent,
context.getString(R.string.new_cupcake_order)
)
)
}
private fun cancelOrderAndNavigateToStart(
viewModel: OrderViewModel,
navController: NavHostController
) {
viewModel.resetOrder()
navController.popBackStack(CupcakeScreen.Start.name, inclusive = false)
}

6
app/src/main/java/com/example/cupcake/ui/SelectOptionScreen.kt
View File

@ -52,6 +52,8 @@ fun SelectOptionScreen(
subtotal: String,
options: List<String>,
onSelectionChanged: (String) -> Unit = {},
onCancelButtonClicked: () -> Unit = {},
onNextButtonClicked: () -> Unit = {},
modifier: Modifier = Modifier
) {
var selectedValue by rememberSaveable { mutableStateOf("") }
@ -105,7 +107,7 @@ fun SelectOptionScreen(
) {
OutlinedButton(
modifier = Modifier.weight(1f),
onClick = {}
onClick = onCancelButtonClicked
) {
Text(stringResource(R.string.cancel))
}
@ -113,7 +115,7 @@ fun SelectOptionScreen(
modifier = Modifier.weight(1f),
// the button is enabled when the user makes a selection
enabled = selectedValue.isNotEmpty(),
onClick = {}
onClick = onNextButtonClicked
) {
Text(stringResource(R.string.next))
}

6
app/src/main/java/com/example/cupcake/ui/StartOrderScreen.kt
View File

@ -49,6 +49,8 @@ import com.example.cupcake.ui.theme.CupcakeTheme
@Composable
fun StartOrderScreen(
quantityOptions: List<Pair<Int, Int>>,
onNextButtonClicked: (Int) -> Unit,
modifier: Modifier = Modifier
) {
Column(
@ -83,7 +85,7 @@ fun StartOrderScreen(
quantityOptions.forEach { item ->
SelectQuantityButton(
labelResourceId = item.first,
onClick = {}
onClick = { onNextButtonClicked(item.second) }
)
}
}
@ -114,9 +116,11 @@ fun StartOrderPreview() {
CupcakeTheme {
StartOrderScreen(
quantityOptions = DataSource.quantityOptions,
onNextButtonClicked = {},
modifier = Modifier
.fillMaxSize()
.padding(dimensionResource(R.dimen.padding_medium))
)
}
}

22
app/src/main/java/com/example/cupcake/ui/SummaryScreen.kt
View File

@ -48,6 +48,9 @@ import com.example.cupcake.ui.theme.CupcakeTheme
@Composable
fun OrderSummaryScreen(
orderUiState: OrderUiState,
onCancelButtonClicked: () -> Unit,
onSendButtonClicked: (String, String) -> Unit,
modifier: Modifier = Modifier
) {
val resources = LocalContext.current.resources
@ -103,13 +106,13 @@ fun OrderSummaryScreen(
) {
Button(
modifier = Modifier.fillMaxWidth(),
onClick = {}
onClick = { onSendButtonClicked(newOrder, orderSummary) }
) {
Text(stringResource(R.string.send))
}
OutlinedButton(
modifier = Modifier.fillMaxWidth(),
onClick = {}
onClick = onCancelButtonClicked
) {
Text(stringResource(R.string.cancel))
}
@ -121,10 +124,13 @@ fun OrderSummaryScreen(
@Preview
@Composable
fun OrderSummaryPreview() {
CupcakeTheme {
OrderSummaryScreen(
orderUiState = OrderUiState(0, "Test", "Test", "$300.00"),
modifier = Modifier.fillMaxHeight()
)
}
CupcakeTheme {
OrderSummaryScreen(
orderUiState = OrderUiState(0, "Test", "Test", "$300.00"),
onSendButtonClicked = { subject: String, summary: String -> },
onCancelButtonClicked = {},
modifier = Modifier.fillMaxHeight()
)
}
}