Getting Started

Build a Product Management Android App with Jetpack Compose

This tutorial demonstrates how to build a basic product management app. The app demonstrates management operations, photo upload, account creation and authentication using:

  • Supabase Database - a Postgres database for storing your user data and Row Level Security so data is protected and users can only access their own information.
  • Supabase Auth - users log in through magic links sent to their email (without having to set up a password).
  • Supabase Storage - users can upload a profile photo.

manage-product-cover

Project setup

Before we start building we're going to set up our Database and API. This is as simple as starting a new Project in Supabase and then creating a "schema" inside the database.

Create a project

  1. Create a new project in the Supabase Dashboard.
  2. Enter your project details.
  3. Wait for the new database to launch.

Set up the database schema

Now we are going to set up the database schema. You can just copy/paste the SQL from below and run it yourself.


_32
-- Create a table for public profiles
_32
_32
create table
_32
public.products (
_32
id uuid not null default gen_random_uuid (),
_32
name text not null,
_32
price real not null,
_32
image text null,
_32
constraint products_pkey primary key (id)
_32
) tablespace pg_default;
_32
_32
-- Set up Storage!
_32
insert into storage.buckets (id, name)
_32
values ('Product Image', 'Product Image');
_32
_32
-- Set up access controls for storage.
_32
-- See https://supabase.com/docs/guides/storage/security/access-control#policy-examples for more details.
_32
CREATE POLICY "Enable read access for all users" ON "storage"."objects"
_32
AS PERMISSIVE FOR SELECT
_32
TO public
_32
USING (true)
_32
_32
CREATE POLICY "Enable insert for all users" ON "storage"."objects"
_32
AS PERMISSIVE FOR INSERT
_32
TO authenticated, anon
_32
WITH CHECK (true)
_32
_32
CREATE POLICY "Enable update for all users" ON "storage"."objects"
_32
AS PERMISSIVE FOR UPDATE
_32
TO public
_32
USING (true)
_32
WITH CHECK (true)

Get the API Keys

Now that you've created some database tables, you are ready to insert data using the auto-generated API. We just need to get the Project URL and anon key from the API settings.

  1. Go to the API Settings page in the Dashboard.
  2. Find your Project URL, anon, and service_role keys on this page.

Set up Google Authentication

From the Google Console, create a new project and add OAuth2 credentials.

Create Google OAuth credentials

In your Supabase Auth settings enable Google as a provider and set the required credentials as outlined in the auth docs.

Building the app

Create new Android project

Open Android Studio > New Project > Base Activity (Jetpack Compose).

Android Studio new project

Set up API key and secret securely

Create local environment secret

Create or edit the local.properties file at the root (same level as build.gradle) of your project.

Note: Do not commit this file to your source control, for example, by adding it to your .gitignore file!


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SUPABASE_ANON_KEY=YOUR_SUPABASE_ANON_KEY
_10
SUPABASE_URL=YOUR_SUPABASE_URL

Read and set value to BuildConfig

In your build.gradle (app) file, create a Properties object and read the values from your local.properties file by calling the buildConfigField method:


_15
defaultConfig {
_15
applicationId "com.example.manageproducts"
_15
minSdkVersion 22
_15
targetSdkVersion 33
_15
versionCode 5
_15
versionName "1.0"
_15
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
_15
_15
// Set value part
_15
Properties properties = new Properties()
_15
properties.load(project.rootProject.file("local.properties").newDataInputStream())
_15
buildConfigField("String", "SUPABASE_ANON_KEY", "\"${properties.getProperty("SUPABASE_ANON_KEY")}\"")
_15
buildConfigField("String", "SECRET", "\"${properties.getProperty("SECRET")}\"")
_15
buildConfigField("String", "SUPABASE_URL", "\"${properties.getProperty("SUPABASE_URL")}\"")
_15
}

Use value from BuildConfig

Read the value from BuildConfig:


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val url = BuildConfig.SUPABASE_URL
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val apiKey = BuildConfig.SUPABASE_ANON_KEY

Set up Supabase dependencies

Gradle dependencies

In the build.gradle (app) file, add these dependencies then press "Sync now." Replace the dependency version placeholders $supabase_version and $ktor_version with their respective latest versions.


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implementation "io.github.jan-tennert.supabase:postgrest-kt:$supabase_version"
_10
implementation "io.github.jan-tennert.supabase:storage-kt:$supabase_version"
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implementation "io.github.jan-tennert.supabase:auth-kt:$supabase_version"
_10
implementation "io.ktor:ktor-client-android:$ktor_version"
_10
implementation "io.ktor:ktor-client-core:$ktor_version"
_10
implementation "io.ktor:ktor-utils:$ktor_version"

Also in the build.gradle (app) file, add the plugin for serialization. The version of this plugin should be the same as your Kotlin version.


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plugins {
_10
...
_10
id 'org.jetbrains.kotlin.plugin.serialization' version '$kotlin_version'
_10
...
_10
}

Set up Hilt for dependency injection

In the build.gradle (app) file, add the following:


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implementation "com.google.dagger:hilt-android:$hilt_version"
_10
annotationProcessor "com.google.dagger:hilt-compiler:$hilt_version"
_10
implementation("androidx.hilt:hilt-navigation-compose:1.0.0")

Create a new ManageProductApplication.kt class extending Application with @HiltAndroidApp annotation:


_10
// ManageProductApplication.kt
_10
@HiltAndroidApp
_10
class ManageProductApplication: Application()

Open the AndroidManifest.xml file, update name property of Application tag:


_10
<application
_10
...
_10
android:name=".ManageProductApplication"
_10
...
_10
</application>

Create the MainActivity:


_10
@AndroidEntryPoint
_10
class MainActivity : ComponentActivity() {
_10
//This will come later
_10
}

Provide Supabase instances with Hilt

To make the app easier to test, create a SupabaseModule.kt file as follows:


_41
@InstallIn(SingletonComponent::class)
_41
@Module
_41
object SupabaseModule {
_41
_41
@Provides
_41
@Singleton
_41
fun provideSupabaseClient(): SupabaseClient {
_41
return createSupabaseClient(
_41
supabaseUrl = BuildConfig.SUPABASE_URL,
_41
supabaseKey = BuildConfig.SUPABASE_ANON_KEY
_41
) {
_41
install(Postgrest)
_41
install(Auth) {
_41
flowType = FlowType.PKCE
_41
scheme = "app"
_41
host = "supabase.com"
_41
}
_41
install(Storage)
_41
}
_41
}
_41
_41
@Provides
_41
@Singleton
_41
fun provideSupabaseDatabase(client: SupabaseClient): Postgrest {
_41
return client.postgrest
_41
}
_41
_41
@Provides
_41
@Singleton
_41
fun provideSupabaseAuth(client: SupabaseClient): Auth {
_41
return client.auth
_41
}
_41
_41
_41
@Provides
_41
@Singleton
_41
fun provideSupabaseStorage(client: SupabaseClient): Storage {
_41
return client.storage
_41
}
_41
_41
}

Create a data transfer object

Create a ProductDto.kt class and use annotations to parse data from Supabase:


_15
@Serializable
_15
data class ProductDto(
_15
_15
@SerialName("name")
_15
val name: String,
_15
_15
@SerialName("price")
_15
val price: Double,
_15
_15
@SerialName("image")
_15
val image: String?,
_15
_15
@SerialName("id")
_15
val id: String,
_15
)

Create a Domain object in Product.kt expose the data in your view:


_10
data class Product(
_10
val id: String,
_10
val name: String,
_10
val price: Double,
_10
val image: String?
_10
)

Implement repositories

Create a ProductRepository interface and its implementation named ProductRepositoryImpl. This holds the logic to interact with data sources from Supabase. Do the same with the AuthenticationRepository.

Create the Product Repository:


_10
interface ProductRepository {
_10
suspend fun createProduct(product: Product): Boolean
_10
suspend fun getProducts(): List<ProductDto>?
_10
suspend fun getProduct(id: String): ProductDto
_10
suspend fun deleteProduct(id: String)
_10
suspend fun updateProduct(
_10
id: String, name: String, price: Double, imageName: String, imageFile: ByteArray
_10
)
_10
}


_91
class ProductRepositoryImpl @Inject constructor(
_91
private val postgrest: Postgrest,
_91
private val storage: Storage,
_91
) : ProductRepository {
_91
override suspend fun createProduct(product: Product): Boolean {
_91
return try {
_91
withContext(Dispatchers.IO) {
_91
val productDto = ProductDto(
_91
name = product.name,
_91
price = product.price,
_91
)
_91
postgrest.from("products").insert(productDto)
_91
true
_91
}
_91
true
_91
} catch (e: java.lang.Exception) {
_91
throw e
_91
}
_91
}
_91
_91
override suspend fun getProducts(): List<ProductDto>? {
_91
return withContext(Dispatchers.IO) {
_91
val result = postgrest.from("products")
_91
.select().decodeList<ProductDto>()
_91
result
_91
}
_91
}
_91
_91
_91
override suspend fun getProduct(id: String): ProductDto {
_91
return withContext(Dispatchers.IO) {
_91
postgrest.from("products").select {
_91
filter {
_91
eq("id", id)
_91
}
_91
}.decodeSingle<ProductDto>()
_91
}
_91
}
_91
_91
override suspend fun deleteProduct(id: String) {
_91
return withContext(Dispatchers.IO) {
_91
postgrest.from("products").delete {
_91
filter {
_91
eq("id", id)
_91
}
_91
}
_91
}
_91
}
_91
_91
override suspend fun updateProduct(
_91
id: String,
_91
name: String,
_91
price: Double,
_91
imageName: String,
_91
imageFile: ByteArray
_91
) {
_91
withContext(Dispatchers.IO) {
_91
if (imageFile.isNotEmpty()) {
_91
val imageUrl =
_91
storage.from("Product%20Image").upload(
_91
path = "$imageName.png",
_91
data = imageFile,
_91
upsert = true
_91
)
_91
postgrest.from("products").update({
_91
set("name", name)
_91
set("price", price)
_91
set("image", buildImageUrl(imageFileName = imageUrl))
_91
}) {
_91
filter {
_91
eq("id", id)
_91
}
_91
}
_91
} else {
_91
postgrest.from("products").update({
_91
set("name", name)
_91
set("price", price)
_91
}) {
_91
filter {
_91
eq("id", id)
_91
}
_91
}
_91
}
_91
}
_91
}
_91
_91
// Because I named the bucket as "Product Image" so when it turns to an url, it is "%20"
_91
// For better approach, you should create your bucket name without space symbol
_91
private fun buildImageUrl(imageFileName: String) =
_91
"${BuildConfig.SUPABASE_URL}/storage/v1/object/public/${imageFileName}".replace(" ", "%20")
_91
}

Create the Authentication Repository:


_10
interface AuthenticationRepository {
_10
suspend fun signIn(email: String, password: String): Boolean
_10
suspend fun signUp(email: String, password: String): Boolean
_10
suspend fun signInWithGoogle(): Boolean
_10
}


_36
class AuthenticationRepositoryImpl @Inject constructor(
_36
private val auth: Auth
_36
) : AuthenticationRepository {
_36
override suspend fun signIn(email: String, password: String): Boolean {
_36
return try {
_36
auth.signInWith(Email) {
_36
this.email = email
_36
this.password = password
_36
}
_36
true
_36
} catch (e: Exception) {
_36
false
_36
}
_36
}
_36
_36
override suspend fun signUp(email: String, password: String): Boolean {
_36
return try {
_36
auth.signUpWith(Email) {
_36
this.email = email
_36
this.password = password
_36
}
_36
true
_36
} catch (e: Exception) {
_36
false
_36
}
_36
}
_36
_36
override suspend fun signInWithGoogle(): Boolean {
_36
return try {
_36
auth.signInWith(Google)
_36
true
_36
} catch (e: Exception) {
_36
false
_36
}
_36
}
_36
}

Implement screens

To navigate screens, use the AndroidX navigation library. For routes, implement a Destination interface:


_36
_36
interface Destination {
_36
val route: String
_36
val title: String
_36
}
_36
_36
_36
object ProductListDestination : Destination {
_36
override val route = "product_list"
_36
override val title = "Product List"
_36
}
_36
_36
object ProductDetailsDestination : Destination {
_36
override val route = "product_details"
_36
override val title = "Product Details"
_36
const val productId = "product_id"
_36
val arguments = listOf(navArgument(name = productId) {
_36
type = NavType.StringType
_36
})
_36
fun createRouteWithParam(productId: String) = "$route/${productId}"
_36
}
_36
_36
object AddProductDestination : Destination {
_36
override val route = "add_product"
_36
override val title = "Add Product"
_36
}
_36
_36
object AuthenticationDestination: Destination {
_36
override val route = "authentication"
_36
override val title = "Authentication"
_36
}
_36
_36
object SignUpDestination: Destination {
_36
override val route = "signup"
_36
override val title = "Sign Up"
_36
}

This will help later for navigating between screens.

Create a ProductListViewModel:


_45
@HiltViewModel
_45
class ProductListViewModel @Inject constructor(
_45
private val productRepository: ProductRepository,
_45
) : ViewModel() {
_45
_45
private val _productList = MutableStateFlow<List<Product>?>(listOf())
_45
val productList: Flow<List<Product>?> = _productList
_45
_45
_45
private val _isLoading = MutableStateFlow(false)
_45
val isLoading: Flow<Boolean> = _isLoading
_45
_45
init {
_45
getProducts()
_45
}
_45
_45
fun getProducts() {
_45
viewModelScope.launch {
_45
val products = productRepository.getProducts()
_45
_productList.emit(products?.map { it -> it.asDomainModel() })
_45
}
_45
}
_45
_45
fun removeItem(product: Product) {
_45
viewModelScope.launch {
_45
val newList = mutableListOf<Product>().apply { _productList.value?.let { addAll(it) } }
_45
newList.remove(product)
_45
_productList.emit(newList.toList())
_45
// Call api to remove
_45
productRepository.deleteProduct(id = product.id)
_45
// Then fetch again
_45
getProducts()
_45
}
_45
}
_45
_45
private fun ProductDto.asDomainModel(): Product {
_45
return Product(
_45
id = this.id,
_45
name = this.name,
_45
price = this.price,
_45
image = this.image
_45
)
_45
}
_45
_45
}

Create the ProductListScreen.kt:


_113
@OptIn(ExperimentalMaterial3Api::class, ExperimentalMaterialApi::class)
_113
@Composable
_113
fun ProductListScreen(
_113
modifier: Modifier = Modifier,
_113
navController: NavController,
_113
viewModel: ProductListViewModel = hiltViewModel(),
_113
) {
_113
val isLoading by viewModel.isLoading.collectAsState(initial = false)
_113
val swipeRefreshState = rememberSwipeRefreshState(isRefreshing = isLoading)
_113
SwipeRefresh(state = swipeRefreshState, onRefresh = { viewModel.getProducts() }) {
_113
Scaffold(
_113
topBar = {
_113
TopAppBar(
_113
backgroundColor = MaterialTheme.colorScheme.primary,
_113
title = {
_113
Text(
_113
text = stringResource(R.string.product_list_text_screen_title),
_113
color = MaterialTheme.colorScheme.onPrimary,
_113
)
_113
},
_113
)
_113
},
_113
floatingActionButton = {
_113
AddProductButton(onClick = { navController.navigate(AddProductDestination.route) })
_113
}
_113
) { padding ->
_113
val productList = viewModel.productList.collectAsState(initial = listOf()).value
_113
if (!productList.isNullOrEmpty()) {
_113
LazyColumn(
_113
modifier = modifier.padding(padding),
_113
contentPadding = PaddingValues(5.dp)
_113
) {
_113
itemsIndexed(
_113
items = productList,
_113
key = { _, product -> product.name }) { _, item ->
_113
val state = rememberDismissState(
_113
confirmStateChange = {
_113
if (it == DismissValue.DismissedToStart) {
_113
// Handle item removed
_113
viewModel.removeItem(item)
_113
}
_113
true
_113
}
_113
)
_113
SwipeToDismiss(
_113
state = state,
_113
background = {
_113
val color by animateColorAsState(
_113
targetValue = when (state.dismissDirection) {
_113
DismissDirection.StartToEnd -> MaterialTheme.colorScheme.primary
_113
DismissDirection.EndToStart -> MaterialTheme.colorScheme.primary.copy(
_113
alpha = 0.2f
_113
)
_113
null -> Color.Transparent
_113
}
_113
)
_113
Box(
_113
modifier = modifier
_113
.fillMaxSize()
_113
.background(color = color)
_113
.padding(16.dp),
_113
) {
_113
Icon(
_113
imageVector = Icons.Filled.Delete,
_113
contentDescription = null,
_113
tint = MaterialTheme.colorScheme.primary,
_113
modifier = modifier.align(Alignment.CenterEnd)
_113
)
_113
}
_113
_113
},
_113
dismissContent = {
_113
ProductListItem(
_113
product = item,
_113
modifier = modifier,
_113
onClick = {
_113
navController.navigate(
_113
ProductDetailsDestination.createRouteWithParam(
_113
item.id
_113
)
_113
)
_113
},
_113
)
_113
},
_113
directions = setOf(DismissDirection.EndToStart),
_113
)
_113
}
_113
}
_113
} else {
_113
Text("Product list is empty!")
_113
}
_113
_113
}
_113
}
_113
}
_113
_113
@Composable
_113
private fun AddProductButton(
_113
modifier: Modifier = Modifier,
_113
onClick: () -> Unit,
_113
) {
_113
FloatingActionButton(
_113
modifier = modifier,
_113
onClick = onClick,
_113
containerColor = MaterialTheme.colorScheme.primary,
_113
contentColor = MaterialTheme.colorScheme.onPrimary
_113
) {
_113
Icon(
_113
imageVector = Icons.Filled.Add,
_113
contentDescription = null,
_113
)
_113
}
_113
}

Create the ProductDetailsViewModel.kt:


_68
_68
@HiltViewModel
_68
class ProductDetailsViewModel @Inject constructor(
_68
private val productRepository: ProductRepository,
_68
savedStateHandle: SavedStateHandle,
_68
) : ViewModel() {
_68
_68
private val _product = MutableStateFlow<Product?>(null)
_68
val product: Flow<Product?> = _product
_68
_68
private val _name = MutableStateFlow("")
_68
val name: Flow<String> = _name
_68
_68
private val _price = MutableStateFlow(0.0)
_68
val price: Flow<Double> = _price
_68
_68
private val _imageUrl = MutableStateFlow("")
_68
val imageUrl: Flow<String> = _imageUrl
_68
_68
init {
_68
val productId = savedStateHandle.get<String>(ProductDetailsDestination.productId)
_68
productId?.let {
_68
getProduct(productId = it)
_68
}
_68
}
_68
_68
private fun getProduct(productId: String) {
_68
viewModelScope.launch {
_68
val result = productRepository.getProduct(productId).asDomainModel()
_68
_product.emit(result)
_68
_name.emit(result.name)
_68
_price.emit(result.price)
_68
}
_68
}
_68
_68
fun onNameChange(name: String) {
_68
_name.value = name
_68
}
_68
_68
fun onPriceChange(price: Double) {
_68
_price.value = price
_68
}
_68
_68
fun onSaveProduct(image: ByteArray) {
_68
viewModelScope.launch {
_68
productRepository.updateProduct(
_68
id = _product.value?.id,
_68
price = _price.value,
_68
name = _name.value,
_68
imageFile = image,
_68
imageName = "image_${_product.value.id}",
_68
)
_68
}
_68
}
_68
_68
fun onImageChange(url: String) {
_68
_imageUrl.value = url
_68
}
_68
_68
private fun ProductDto.asDomainModel(): Product {
_68
return Product(
_68
id = this.id,
_68
name = this.name,
_68
price = this.price,
_68
image = this.image
_68
)
_68
}
_68
}

Create the ProductDetailsScreen.kt:


_167
@OptIn(ExperimentalCoilApi::class)
_167
@SuppressLint("UnusedMaterialScaffoldPaddingParameter")
_167
@Composable
_167
fun ProductDetailsScreen(
_167
modifier: Modifier = Modifier,
_167
viewModel: ProductDetailsViewModel = hiltViewModel(),
_167
navController: NavController,
_167
productId: String?,
_167
) {
_167
val snackBarHostState = remember { SnackbarHostState() }
_167
val coroutineScope = rememberCoroutineScope()
_167
_167
Scaffold(
_167
snackbarHost = { SnackbarHost(snackBarHostState) },
_167
topBar = {
_167
TopAppBar(
_167
navigationIcon = {
_167
IconButton(onClick = {
_167
navController.navigateUp()
_167
}) {
_167
Icon(
_167
imageVector = Icons.Filled.ArrowBack,
_167
contentDescription = null,
_167
tint = MaterialTheme.colorScheme.onPrimary
_167
)
_167
}
_167
},
_167
backgroundColor = MaterialTheme.colorScheme.primary,
_167
title = {
_167
Text(
_167
text = stringResource(R.string.product_details_text_screen_title),
_167
color = MaterialTheme.colorScheme.onPrimary,
_167
)
_167
},
_167
)
_167
}
_167
) {
_167
val name = viewModel.name.collectAsState(initial = "")
_167
val price = viewModel.price.collectAsState(initial = 0.0)
_167
var imageUrl = Uri.parse(viewModel.imageUrl.collectAsState(initial = null).value)
_167
val contentResolver = LocalContext.current.contentResolver
_167
_167
Column(
_167
modifier = modifier
_167
.padding(16.dp)
_167
.fillMaxSize()
_167
) {
_167
val galleryLauncher =
_167
rememberLauncherForActivityResult(ActivityResultContracts.GetContent())
_167
{ uri ->
_167
uri?.let {
_167
if (it.toString() != imageUrl.toString()) {
_167
viewModel.onImageChange(it.toString())
_167
}
_167
}
_167
}
_167
_167
Image(
_167
painter = rememberImagePainter(imageUrl),
_167
contentScale = ContentScale.Fit,
_167
contentDescription = null,
_167
modifier = Modifier
_167
.padding(16.dp, 8.dp)
_167
.size(100.dp)
_167
.align(Alignment.CenterHorizontally)
_167
)
_167
IconButton(modifier = modifier.align(alignment = Alignment.CenterHorizontally),
_167
onClick = {
_167
galleryLauncher.launch("image/*")
_167
}) {
_167
Icon(
_167
imageVector = Icons.Filled.Edit,
_167
contentDescription = null,
_167
tint = MaterialTheme.colorScheme.primary
_167
)
_167
}
_167
OutlinedTextField(
_167
label = {
_167
Text(
_167
text = "Product name",
_167
color = MaterialTheme.colorScheme.primary,
_167
style = MaterialTheme.typography.titleMedium
_167
)
_167
},
_167
maxLines = 2,
_167
shape = RoundedCornerShape(32),
_167
modifier = modifier.fillMaxWidth(),
_167
value = name.value,
_167
onValueChange = {
_167
viewModel.onNameChange(it)
_167
},
_167
)
_167
Spacer(modifier = modifier.height(12.dp))
_167
OutlinedTextField(
_167
label = {
_167
Text(
_167
text = "Product price",
_167
color = MaterialTheme.colorScheme.primary,
_167
style = MaterialTheme.typography.titleMedium
_167
)
_167
},
_167
maxLines = 2,
_167
shape = RoundedCornerShape(32),
_167
modifier = modifier.fillMaxWidth(),
_167
value = price.value.toString(),
_167
keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
_167
onValueChange = {
_167
viewModel.onPriceChange(it.toDouble())
_167
},
_167
)
_167
Spacer(modifier = modifier.weight(1f))
_167
Button(
_167
modifier = modifier.fillMaxWidth(),
_167
onClick = {
_167
if (imageUrl.host?.contains("supabase") == true) {
_167
viewModel.onSaveProduct(image = byteArrayOf())
_167
} else {
_167
val image = uriToByteArray(contentResolver, imageUrl)
_167
viewModel.onSaveProduct(image = image)
_167
}
_167
coroutineScope.launch {
_167
snackBarHostState.showSnackbar(
_167
message = "Product updated successfully !",
_167
duration = SnackbarDuration.Short
_167
)
_167
}
_167
}) {
_167
Text(text = "Save changes")
_167
}
_167
Spacer(modifier = modifier.height(12.dp))
_167
OutlinedButton(
_167
modifier = modifier
_167
.fillMaxWidth(),
_167
onClick = {
_167
navController.navigateUp()
_167
}) {
_167
Text(text = "Cancel")
_167
}
_167
_167
}
_167
_167
}
_167
}
_167
_167
_167
private fun getBytes(inputStream: InputStream): ByteArray {
_167
val byteBuffer = ByteArrayOutputStream()
_167
val bufferSize = 1024
_167
val buffer = ByteArray(bufferSize)
_167
var len = 0
_167
while (inputStream.read(buffer).also { len = it } != -1) {
_167
byteBuffer.write(buffer, 0, len)
_167
}
_167
return byteBuffer.toByteArray()
_167
}
_167
_167
_167
private fun uriToByteArray(contentResolver: ContentResolver, uri: Uri): ByteArray {
_167
if (uri == Uri.EMPTY) {
_167
return byteArrayOf()
_167
}
_167
val inputStream = contentResolver.openInputStream(uri)
_167
if (inputStream != null) {
_167
return getBytes(inputStream)
_167
}
_167
return byteArrayOf()
_167
}

Create a AddProductScreen:


_54
@SuppressLint("UnusedMaterial3ScaffoldPaddingParameter")
_54
@OptIn(ExperimentalMaterial3Api::class)
_54
@Composable
_54
fun AddProductScreen(
_54
modifier: Modifier = Modifier,
_54
navController: NavController,
_54
viewModel: AddProductViewModel = hiltViewModel(),
_54
) {
_54
Scaffold(
_54
topBar = {
_54
TopAppBar(
_54
navigationIcon = {
_54
IconButton(onClick = {
_54
navController.navigateUp()
_54
}) {
_54
Icon(
_54
imageVector = Icons.Filled.ArrowBack,
_54
contentDescription = null,
_54
tint = MaterialTheme.colorScheme.onPrimary
_54
)
_54
}
_54
},
_54
backgroundColor = MaterialTheme.colorScheme.primary,
_54
title = {
_54
Text(
_54
text = stringResource(R.string.add_product_text_screen_title),
_54
color = MaterialTheme.colorScheme.onPrimary,
_54
)
_54
},
_54
)
_54
}
_54
) { padding ->
_54
val navigateAddProductSuccess =
_54
viewModel.navigateAddProductSuccess.collectAsState(initial = null).value
_54
val isLoading =
_54
viewModel.isLoading.collectAsState(initial = null).value
_54
if (isLoading == true) {
_54
LoadingScreen(message = "Adding Product",
_54
onCancelSelected = {
_54
navController.navigateUp()
_54
})
_54
} else {
_54
SuccessScreen(
_54
message = "Product added",
_54
onMoreAction = {
_54
viewModel.onAddMoreProductSelected()
_54
},
_54
onNavigateBack = {
_54
navController.navigateUp()
_54
})
_54
}
_54
_54
}
_54
}

Create the AddProductViewModel.kt:


_27
@HiltViewModel
_27
class AddProductViewModel @Inject constructor(
_27
private val productRepository: ProductRepository,
_27
) : ViewModel() {
_27
_27
private val _isLoading = MutableStateFlow(false)
_27
val isLoading: Flow<Boolean> = _isLoading
_27
_27
private val _showSuccessMessage = MutableStateFlow(false)
_27
val showSuccessMessage: Flow<Boolean> = _showSuccessMessage
_27
_27
fun onCreateProduct(name: String, price: Double) {
_27
if (name.isEmpty() || price <= 0) return
_27
viewModelScope.launch {
_27
_isLoading.value = true
_27
val product = Product(
_27
id = UUID.randomUUID().toString(),
_27
name = name,
_27
price = price,
_27
)
_27
productRepository.createProduct(product = product)
_27
_isLoading.value = false
_27
_showSuccessMessage.emit(true)
_27
_27
}
_27
}
_27
}

Create a SignUpViewModel:


_28
@HiltViewModel
_28
class SignUpViewModel @Inject constructor(
_28
private val authenticationRepository: AuthenticationRepository
_28
) : ViewModel() {
_28
_28
private val _email = MutableStateFlow("")
_28
val email: Flow<String> = _email
_28
_28
private val _password = MutableStateFlow("")
_28
val password = _password
_28
_28
fun onEmailChange(email: String) {
_28
_email.value = email
_28
}
_28
_28
fun onPasswordChange(password: String) {
_28
_password.value = password
_28
}
_28
_28
fun onSignUp() {
_28
viewModelScope.launch {
_28
authenticationRepository.signUp(
_28
email = _email.value,
_28
password = _password.value
_28
)
_28
}
_28
}
_28
}

Create the SignUpScreen.kt:


_93
@Composable
_93
fun SignUpScreen(
_93
modifier: Modifier = Modifier,
_93
navController: NavController,
_93
viewModel: SignUpViewModel = hiltViewModel()
_93
) {
_93
val snackBarHostState = remember { SnackbarHostState() }
_93
val coroutineScope = rememberCoroutineScope()
_93
Scaffold(
_93
snackbarHost = { androidx.compose.material.SnackbarHost(snackBarHostState) },
_93
topBar = {
_93
TopAppBar(
_93
navigationIcon = {
_93
IconButton(onClick = {
_93
navController.navigateUp()
_93
}) {
_93
Icon(
_93
imageVector = Icons.Filled.ArrowBack,
_93
contentDescription = null,
_93
tint = MaterialTheme.colorScheme.onPrimary
_93
)
_93
}
_93
},
_93
backgroundColor = MaterialTheme.colorScheme.primary,
_93
title = {
_93
Text(
_93
text = "Sign Up",
_93
color = MaterialTheme.colorScheme.onPrimary,
_93
)
_93
},
_93
)
_93
}
_93
) { paddingValues ->
_93
Column(
_93
modifier = modifier
_93
.padding(paddingValues)
_93
.padding(20.dp)
_93
) {
_93
val email = viewModel.email.collectAsState(initial = "")
_93
val password = viewModel.password.collectAsState()
_93
OutlinedTextField(
_93
label = {
_93
Text(
_93
text = "Email",
_93
color = MaterialTheme.colorScheme.primary,
_93
style = MaterialTheme.typography.titleMedium
_93
)
_93
},
_93
maxLines = 1,
_93
shape = RoundedCornerShape(32),
_93
modifier = modifier.fillMaxWidth(),
_93
value = email.value,
_93
onValueChange = {
_93
viewModel.onEmailChange(it)
_93
},
_93
)
_93
OutlinedTextField(
_93
label = {
_93
Text(
_93
text = "Password",
_93
color = MaterialTheme.colorScheme.primary,
_93
style = MaterialTheme.typography.titleMedium
_93
)
_93
},
_93
maxLines = 1,
_93
shape = RoundedCornerShape(32),
_93
modifier = modifier
_93
.fillMaxWidth()
_93
.padding(top = 12.dp),
_93
value = password.value,
_93
onValueChange = {
_93
viewModel.onPasswordChange(it)
_93
},
_93
)
_93
val localSoftwareKeyboardController = LocalSoftwareKeyboardController.current
_93
Button(modifier = modifier
_93
.fillMaxWidth()
_93
.padding(top = 12.dp),
_93
onClick = {
_93
localSoftwareKeyboardController?.hide()
_93
viewModel.onSignUp()
_93
coroutineScope.launch {
_93
snackBarHostState.showSnackbar(
_93
message = "Create account successfully. Sign in now!",
_93
duration = SnackbarDuration.Long
_93
)
_93
}
_93
}) {
_93
Text("Sign up")
_93
}
_93
}
_93
}
_93
}

Create a SignInViewModel:


_35
@HiltViewModel
_35
class SignInViewModel @Inject constructor(
_35
private val authenticationRepository: AuthenticationRepository
_35
) : ViewModel() {
_35
_35
private val _email = MutableStateFlow("")
_35
val email: Flow<String> = _email
_35
_35
private val _password = MutableStateFlow("")
_35
val password = _password
_35
_35
fun onEmailChange(email: String) {
_35
_email.value = email
_35
}
_35
_35
fun onPasswordChange(password: String) {
_35
_password.value = password
_35
}
_35
_35
fun onSignIn() {
_35
viewModelScope.launch {
_35
authenticationRepository.signIn(
_35
email = _email.value,
_35
password = _password.value
_35
)
_35
}
_35
}
_35
_35
fun onGoogleSignIn() {
_35
viewModelScope.launch {
_35
authenticationRepository.signInWithGoogle()
_35
}
_35
}
_35
_35
}

Create the SignInScreen.kt:


_110
@OptIn(ExperimentalMaterial3Api::class, ExperimentalComposeUiApi::class)
_110
@Composable
_110
fun SignInScreen(
_110
modifier: Modifier = Modifier,
_110
navController: NavController,
_110
viewModel: SignInViewModel = hiltViewModel()
_110
) {
_110
val snackBarHostState = remember { SnackbarHostState() }
_110
val coroutineScope = rememberCoroutineScope()
_110
Scaffold(
_110
snackbarHost = { androidx.compose.material.SnackbarHost(snackBarHostState) },
_110
topBar = {
_110
TopAppBar(
_110
navigationIcon = {
_110
IconButton(onClick = {
_110
navController.navigateUp()
_110
}) {
_110
Icon(
_110
imageVector = Icons.Filled.ArrowBack,
_110
contentDescription = null,
_110
tint = MaterialTheme.colorScheme.onPrimary
_110
)
_110
}
_110
},
_110
backgroundColor = MaterialTheme.colorScheme.primary,
_110
title = {
_110
Text(
_110
text = "Login",
_110
color = MaterialTheme.colorScheme.onPrimary,
_110
)
_110
},
_110
)
_110
}
_110
) { paddingValues ->
_110
Column(
_110
modifier = modifier
_110
.padding(paddingValues)
_110
.padding(20.dp)
_110
) {
_110
val email = viewModel.email.collectAsState(initial = "")
_110
val password = viewModel.password.collectAsState()
_110
androidx.compose.material.OutlinedTextField(
_110
label = {
_110
Text(
_110
text = "Email",
_110
color = MaterialTheme.colorScheme.primary,
_110
style = MaterialTheme.typography.titleMedium
_110
)
_110
},
_110
maxLines = 1,
_110
shape = RoundedCornerShape(32),
_110
modifier = modifier.fillMaxWidth(),
_110
value = email.value,
_110
onValueChange = {
_110
viewModel.onEmailChange(it)
_110
},
_110
)
_110
androidx.compose.material.OutlinedTextField(
_110
label = {
_110
Text(
_110
text = "Password",
_110
color = MaterialTheme.colorScheme.primary,
_110
style = MaterialTheme.typography.titleMedium
_110
)
_110
},
_110
maxLines = 1,
_110
shape = RoundedCornerShape(32),
_110
modifier = modifier
_110
.fillMaxWidth()
_110
.padding(top = 12.dp),
_110
value = password.value,
_110
onValueChange = {
_110
viewModel.onPasswordChange(it)
_110
},
_110
)
_110
val localSoftwareKeyboardController = LocalSoftwareKeyboardController.current
_110
Button(modifier = modifier
_110
.fillMaxWidth()
_110
.padding(top = 12.dp),
_110
onClick = {
_110
localSoftwareKeyboardController?.hide()
_110
viewModel.onGoogleSignIn()
_110
}) {
_110
Text("Sign in with Google")
_110
}
_110
Button(modifier = modifier
_110
.fillMaxWidth()
_110
.padding(top = 12.dp),
_110
onClick = {
_110
localSoftwareKeyboardController?.hide()
_110
viewModel.onSignIn()
_110
coroutineScope.launch {
_110
snackBarHostState.showSnackbar(
_110
message = "Sign in successfully !",
_110
duration = SnackbarDuration.Long
_110
)
_110
}
_110
}) {
_110
Text("Sign in")
_110
}
_110
OutlinedButton(modifier = modifier
_110
.fillMaxWidth()
_110
.padding(top = 12.dp), onClick = {
_110
navController.navigate(SignUpDestination.route)
_110
}) {
_110
Text("Sign up")
_110
}
_110
}
_110
}
_110
}

Implement the MainActivity

In the MainActivity you created earlier, show your newly created screens:


_61
@AndroidEntryPoint
_61
class MainActivity : ComponentActivity() {
_61
@Inject
_61
lateinit var supabaseClient: SupabaseClient
_61
_61
@OptIn(ExperimentalMaterial3Api::class)
_61
override fun onCreate(savedInstanceState: Bundle?) {
_61
super.onCreate(savedInstanceState)
_61
setContent {
_61
ManageProductsTheme {
_61
// A surface container using the 'background' color from the theme
_61
val navController = rememberNavController()
_61
val currentBackStack by navController.currentBackStackEntryAsState()
_61
val currentDestination = currentBackStack?.destination
_61
Scaffold { innerPadding ->
_61
NavHost(
_61
navController,
_61
startDestination = ProductListDestination.route,
_61
Modifier.padding(innerPadding)
_61
) {
_61
composable(ProductListDestination.route) {
_61
ProductListScreen(
_61
navController = navController
_61
)
_61
}
_61
_61
composable(AuthenticationDestination.route) {
_61
SignInScreen(
_61
navController = navController
_61
)
_61
}
_61
_61
composable(SignUpDestination.route) {
_61
SignUpScreen(
_61
navController = navController
_61
)
_61
}
_61
_61
composable(AddProductDestination.route) {
_61
AddProductScreen(
_61
navController = navController
_61
)
_61
}
_61
_61
composable(
_61
route = "${ProductDetailsDestination.route}/{${ProductDetailsDestination.productId}}",
_61
arguments = ProductDetailsDestination.arguments
_61
) { navBackStackEntry ->
_61
val productId =
_61
navBackStackEntry.arguments?.getString(ProductDetailsDestination.productId)
_61
ProductDetailsScreen(
_61
productId = productId,
_61
navController = navController,
_61
)
_61
}
_61
}
_61
}
_61
}
_61
}
_61
}
_61
}

Create the success screen

To handle OAuth and OTP signins, create a new activity to handle the deeplink you set in AndroidManifest.xml:


_40
<?xml version="1.0" encoding="utf-8"?>
_40
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
_40
xmlns:tools="http://schemas.android.com/tools">
_40
<uses-permission android:name="android.permission.INTERNET" />
_40
<application
_40
android:name=".ManageProductApplication"
_40
android:allowBackup="true"
_40
android:dataExtractionRules="@xml/data_extraction_rules"
_40
android:enableOnBackInvokedCallback="true"
_40
android:fullBackupContent="@xml/backup_rules"
_40
android:icon="@mipmap/ic_launcher"
_40
android:label="@string/app_name"
_40
android:supportsRtl="true"
_40
android:theme="@style/Theme.ManageProducts"
_40
tools:targetApi="31">
_40
<activity
_40
android:name=".DeepLinkHandlerActivity"
_40
android:exported="true"
_40
android:theme="@style/Theme.ManageProducts" >
_40
<intent-filter android:autoVerify="true">
_40
<action android:name="android.intent.action.VIEW" />
_40
<category android:name="android.intent.category.DEFAULT" />
_40
<category android:name="android.intent.category.BROWSABLE" />
_40
<data
_40
android:host="supabase.com"
_40
android:scheme="app" />
_40
</intent-filter>
_40
</activity>
_40
<activity
_40
android:name=".MainActivity"
_40
android:exported="true"
_40
android:label="@string/app_name"
_40
android:theme="@style/Theme.ManageProducts">
_40
<intent-filter>
_40
<action android:name="android.intent.action.MAIN" />
_40
<category android:name="android.intent.category.LAUNCHER" />
_40
</intent-filter>
_40
</activity>
_40
</application>
_40
</manifest>

Then create the DeepLinkHandlerActivity:


_51
@AndroidEntryPoint
_51
class DeepLinkHandlerActivity : ComponentActivity() {
_51
_51
@Inject
_51
lateinit var supabaseClient: SupabaseClient
_51
_51
private lateinit var callback: (String, String) -> Unit
_51
_51
override fun onCreate(savedInstanceState: Bundle?) {
_51
super.onCreate(savedInstanceState)
_51
supabaseClient.handleDeeplinks(intent = intent,
_51
onSessionSuccess = { userSession ->
_51
Log.d("LOGIN", "Log in successfully with user info: ${userSession.user}")
_51
userSession.user?.apply {
_51
callback(email ?: "", createdAt.toString())
_51
}
_51
})
_51
setContent {
_51
val navController = rememberNavController()
_51
val emailState = remember { mutableStateOf("") }
_51
val createdAtState = remember { mutableStateOf("") }
_51
LaunchedEffect(Unit) {
_51
callback = { email, created ->
_51
emailState.value = email
_51
createdAtState.value = created
_51
}
_51
}
_51
ManageProductsTheme {
_51
Surface(
_51
modifier = Modifier.fillMaxSize(),
_51
color = MaterialTheme.colorScheme.background
_51
) {
_51
SignInSuccessScreen(
_51
modifier = Modifier.padding(20.dp),
_51
navController = navController,
_51
email = emailState.value,
_51
createdAt = createdAtState.value,
_51
onClick = { navigateToMainApp() }
_51
)
_51
}
_51
}
_51
}
_51
}
_51
_51
private fun navigateToMainApp() {
_51
val intent = Intent(this, MainActivity::class.java).apply {
_51
flags = Intent.FLAG_ACTIVITY_CLEAR_TOP
_51
}
_51
startActivity(intent)
_51
}
_51
}