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.

note

If you get stuck while working through this guide, refer to the full example on GitHub.

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#

Create a new project in the Supabase Dashboard.
Enter your project details.
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.

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

Go to the API Settings page in the Dashboard.
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.

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).

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, e.g. by adding it to your .gitignore file!

SUPABASE_ANON_KEY=YOUR_SUPABASE_ANON_KEY
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:

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

Use value from `BuildConfig`

Read the value from BuildConfig:

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

Set up Supabase 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.

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

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

Set up Hilt for dependency injection#

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

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

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

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

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

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

Add annotation for the MainActivity:

@AndroidEntryPoint
class MainActivity : ComponentActivity() {
}

Provide Supabase instances with Hilt#

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

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

Create a data transfer object#

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

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

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

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

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:

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

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

Create the Authentication Repository:

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

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

Implement screens#

Create a ProductListViewModel:

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

Create the ProductListScreen.kt:

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

Create the ProductDetailsViewModel.kt:

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

Create the ProductDetailsScreen.kt:

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

Create a AddProductScreen:

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

Create the AddProductViewModel.kt:

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

Create a SignUpViewModel:

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

Create the SignUpScreen.kt:

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

Create a SignInViewModel:

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

Create the SignInScreen.kt:

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

Create the success screen#

Implement a "Sign In" success screen. Create new "Empty Activity" and in AndroidManifest.xml, add a deep link, make sure scheme and host are the same as the ones set in the GoTrue instance.

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

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

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