Compose code for analytics

analytics/app/build.gradle

@@ -8,12 +8,12 @@ check.dependsOn 'assembleDebugAndroidTest'
 
 android {
     namespace 'com.google.firebase.quickstart.analytics'
-    compileSdk 33
+    compileSdk 34
 
     defaultConfig {
         applicationId "com.google.firebase.quickstart.analytics"
         minSdk 21 // minSdk would be 19 without compose
-        targetSdk 33
+        targetSdk 34
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
@@ -77,6 +77,9 @@ dependencies {
     implementation "androidx.compose.ui:ui-tooling-preview:$compose_version"
     implementation 'androidx.activity:activity-compose:1.5.1'
 
+    implementation 'androidx.compose.foundation:foundation-android:1.6.8'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-compose:2.7.0'
+
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
     androidTestImplementation 'androidx.test:rules:1.4.0'
     androidTestImplementation 'androidx.test:runner:1.4.0'

analytics/app/src/main/AndroidManifest.xml

@@ -13,6 +13,9 @@
         <activity
             android:name="com.google.firebase.quickstart.analytics.kotlin.MainActivity"/>
 
+        <activity
+            android:name="com.google.firebase.quickstart.analytics.kotlin.ComposeMainActivity"/>
+
         <activity
             android:name="com.google.firebase.quickstart.analytics.EntryChoiceActivity"
             android:label="@string/app_name"

analytics/app/src/main/java/com/google/firebase/quickstart/analytics/EntryChoiceActivity.kt

@@ -8,18 +8,24 @@ class EntryChoiceActivity : BaseEntryChoiceActivity() {
 
     override fun getChoices(): List<Choice> {
         return listOf(
-                Choice(
-                        "Java",
-                        "Run the Firebase Analytics quickstart written in Java.",
-                        Intent(
-                            this,
-                            com.google.firebase.quickstart.analytics.java.MainActivity::class.java)),
-                Choice(
-                        "Kotlin",
-                        "Run the Firebase Analytics quickstart written in Kotlin.",
-                        Intent(
-                            this,
-                            com.google.firebase.quickstart.analytics.kotlin.MainActivity::class.java))
+            Choice(
+                "Java",
+                "Run the Firebase Analytics quickstart written in Java.",
+                Intent(
+                    this,
+                    com.google.firebase.quickstart.analytics.java.MainActivity::class.java)),
+            Choice(
+                "Kotlin",
+                "Run the Firebase Analytics quickstart written in Kotlin.",
+                Intent(
+                    this,
+                    com.google.firebase.quickstart.analytics.kotlin.MainActivity::class.java)),
+            Choice(
+                "Compose",
+                "Run the Firebase Analytics quickstart written in Compose.",
+                Intent(
+                    this,
+                    com.google.firebase.quickstart.analytics.kotlin.ComposeMainActivity::class.java))
         )
     }
 }

analytics/app/src/main/java/com/google/firebase/quickstart/analytics/kotlin/ComposeMainActivity.kt

@@ -0,0 +1,319 @@
+package com.google.firebase.quickstart.analytics.kotlin
+
+import android.content.Context
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.pager.HorizontalPager
+import androidx.compose.foundation.pager.rememberPagerState
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material.AlertDialog
+import androidx.compose.material.Button
+import androidx.compose.material.Icon
+import androidx.compose.material.IconButton
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.RadioButton
+import androidx.compose.material.Scaffold
+import androidx.compose.material.SnackbarHost
+import androidx.compose.material.SnackbarHostState
+import androidx.compose.material.Surface
+import androidx.compose.material.Tab
+import androidx.compose.material.TabRow
+import androidx.compose.material.TabRowDefaults
+import androidx.compose.material.TabRowDefaults.tabIndicatorOffset
+import androidx.compose.material.Text
+import androidx.compose.material.TopAppBar
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Share
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshotFlow
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.shadow
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalLifecycleOwner
+import androidx.compose.ui.res.colorResource
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringArrayResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import androidx.core.app.ShareCompat
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.preference.PreferenceManager
+import com.google.firebase.analytics.ktx.analytics
+import com.google.firebase.ktx.Firebase
+import com.google.firebase.quickstart.analytics.R
+import com.google.firebase.quickstart.analytics.kotlin.ui.theme.FirebaseAnalyticsTheme
+import kotlinx.coroutines.launch
+
+class ComposeMainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setContent {
+            FirebaseAnalyticsTheme {
+                // A surface container using the 'background' color from the theme
+                Surface(
+                    modifier = Modifier.fillMaxSize(),
+                    color = MaterialTheme.colors.background
+                ) {
+                    MainAppView()
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun MainAppView(
+    lifecycleOwner: LifecycleOwner = LocalLifecycleOwner.current
+) {
+    val context = LocalContext.current
+    val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context)
+    val analyticsViewModel: FirebaseAnalyticsViewModel = viewModel(
+        factory = FirebaseAnalyticsViewModel.Factory(Firebase.analytics, sharedPreferences)
+    )
+    val snackbarHostState = remember { SnackbarHostState() }
+
+    DisposableEffect(lifecycleOwner) {
+        val observer = LifecycleEventObserver { _, event ->
+            if (event == Lifecycle.Event.ON_CREATE) {
+                recordImageView(analyticsViewModel, context)
+            } else if (event == Lifecycle.Event.ON_RESUME) {
+                recordScreenView(analyticsViewModel, context)
+            }
+        }
+
+        lifecycleOwner.lifecycle.addObserver(observer)
+
+        onDispose {
+            lifecycleOwner.lifecycle.removeObserver(observer)
+        }
+    }
+
+    // Load favorite food on initial composition
+    LaunchedEffect(Unit) {
+        if(analyticsViewModel.userFavoriteFood.value == null)
+            analyticsViewModel.showFavoriteFoodDialog.value = true
+    }
+
+    Scaffold(
+        snackbarHost = {
+            SnackbarHost(hostState = snackbarHostState)
+        },
+        modifier = Modifier.fillMaxSize(),
+        topBar = {
+            MainAppBar(analyticsViewModel)
+        },
+        content = { paddingValues ->
+            Column(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .padding(paddingValues),
+            ) {
+                MainContent(analyticsViewModel)
+                FavoriteFoodDialog(analyticsViewModel, snackbarHostState)
+            }
+        }
+    )
+}
+
+@Composable
+fun MainAppBar(analyticsViewModel: FirebaseAnalyticsViewModel) {
+    val context = LocalContext.current
+    TopAppBar(
+        title = {
+            Text(
+                text = stringResource(R.string.app_name),
+                style = MaterialTheme.typography.h6,
+                textAlign = TextAlign.Center,
+                modifier = Modifier.padding(8.dp),
+                color = Color.White
+            )
+        },
+        backgroundColor = colorResource(R.color.colorPrimary),
+        actions = {
+            IconButton(onClick = {
+                val imageTitle = getCurrentImageTitle(context, analyticsViewModel.selectedImageIndex.value)
+                val text = "I'd love you to hear about $imageTitle"
+
+                ShareCompat.IntentBuilder(context).setType("text/plain")
+                    .setText(text)
+                    .startChooser()
+
+                analyticsViewModel.recordShareEvent(imageTitle, text)
+            }) {
+                Icon(Icons.Filled.Share, contentDescription = "Share")
+            }
+        }
+    )
+}
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+fun MainContent(analyticsViewModel: FirebaseAnalyticsViewModel) {
+    val context = LocalContext.current
+    val coroutineScope = rememberCoroutineScope()
+    val pagerState = rememberPagerState(initialPage = 0, pageCount = { Constants.IMAGE_INFOS.size })
+
+    LaunchedEffect(pagerState) {
+        snapshotFlow { pagerState.targetPage }.collect { page ->
+            analyticsViewModel.setSelectedImageIndex(page)
+            recordImageView(analyticsViewModel, context)
+            recordScreenView(analyticsViewModel, context)
+        }
+    }
+
+    TabRow(
+        backgroundColor = Color.White,
+        selectedTabIndex = pagerState.currentPage,
+        indicator = { tabPositions ->
+            TabRowDefaults.Indicator(
+                modifier = Modifier.tabIndicatorOffset(tabPositions[pagerState.currentPage]),
+                color = colorResource(id = R.color.colorPrimary)
+            )
+        },
+    ) {
+        Constants.IMAGE_INFOS.forEachIndexed { index, info ->
+            val isSelected = pagerState.currentPage == index
+            Tab(
+                text = {
+                    Text(text = stringResource(id = info.title),
+                        color = if(isSelected) colorResource(id = R.color.colorPrimary) else Color.Black)
+                },
+                selected = isSelected,
+                onClick = {
+                    coroutineScope.launch {
+                        pagerState.animateScrollToPage(index)
+                    }
+                },
+            )
+        }
+    }
+    //Image Pager
+    HorizontalPager(
+        state = pagerState,
+        modifier = Modifier.fillMaxSize()
+    ) { page ->
+        ImageCard(imageInfo = Constants.IMAGE_INFOS[page])
+    }
+}
+
+@Composable
+fun ImageCard(imageInfo: ImageInfo) {
+    Box(
+        modifier = Modifier.fillMaxSize(),
+        contentAlignment = Alignment.Center
+    ) {
+        Image(
+            painter = painterResource(id = imageInfo.image),
+            contentDescription = stringResource(id = imageInfo.title),
+            modifier = Modifier
+                .shadow(elevation = 2.dp, shape = CircleShape)
+                .background(Color.White, shape = CircleShape)
+                .padding(16.dp)
+        )
+    }
+}
+
+@Composable
+fun FavoriteFoodDialog(
+    analyticsViewModel: FirebaseAnalyticsViewModel,
+    snackbarHostState: SnackbarHostState
+) {
+    if (analyticsViewModel.showFavoriteFoodDialog.value) {
+        val coroutineScope = rememberCoroutineScope()
+        val choices = stringArrayResource(id = R.array.food_items)
+        var selectedItem by remember { mutableIntStateOf(0) }
+
+        AlertDialog(
+            onDismissRequest = {
+                analyticsViewModel.showFavoriteFoodDialog.value = false
+            },
+            title = { Text(stringResource(id = R.string.food_dialog_title)) },
+            text = {
+                Column {
+                    choices.forEachIndexed { index, item ->
+                        Row(
+                            verticalAlignment = Alignment.CenterVertically,
+                            modifier = Modifier.clickable { selectedItem = index }
+                        ) {
+                            RadioButton(
+                                selected = selectedItem == index,
+                                onClick = { selectedItem = index }
+                            )
+                            Text(item)
+                        }
+                    }
+                }
+            },
+            confirmButton = {
+                Button(onClick = {
+                    val selectedFood = choices[selectedItem]
+                    analyticsViewModel.setUserFavoriteFood(selectedFood)
+                    coroutineScope.launch {
+                        snackbarHostState.showSnackbar("Favorite Food selected: $selectedFood")
+                    }
+                }) {
+                    Text("OK")
+                }
+            }
+        )
+    }
+}
+
+private fun getCurrentImageTitle(context: Context, position: Int): String {
+    val imageDetails = Constants.IMAGE_INFOS[position]
+    return context.getString(imageDetails.title)
+}
+
+private fun getCurrentImageId(context: Context, position: Int): String {
+    val imageDetails = Constants.IMAGE_INFOS[position]
+    return context.getString(imageDetails.id)
+}
+
+private fun recordScreenView(analyticsViewModel: FirebaseAnalyticsViewModel, context: Context) {
+    val position = analyticsViewModel.selectedImageIndex.value
+    val imageId = getCurrentImageId(context, position)
+    val imageTitle = getCurrentImageTitle(context, position)
+
+    analyticsViewModel.recordScreenView("${imageId}-${imageTitle}", "ComposeMainActivity")
+}
+
+private fun recordImageView(analyticsViewModel: FirebaseAnalyticsViewModel, context: Context) {
+    val position = analyticsViewModel.selectedImageIndex.value
+    val imageId = getCurrentImageId(context, position)
+    val imageTitle = getCurrentImageTitle(context, position)
+
+    analyticsViewModel.recordImageView(imageId, imageTitle)
+}
+
+@Preview(showBackground = true)
+@Composable
+fun MainAppPreview() {
+    FirebaseAnalyticsTheme {
+        MainAppView()
+    }
+}