Use Flows instead of suspend function to create a buildable list of strings.

Author: pahill

step4/androidApp/build.gradle.kts

@@ -45,5 +45,7 @@ dependencies {
     implementation("androidx.compose.ui:ui-tooling-preview:1.4.3")
     implementation("androidx.compose.foundation:foundation:1.4.3")
     implementation("androidx.compose.material:material:1.4.3")
-    implementation("androidx.activity:activity-compose:1.7.1")
+    implementation("androidx.activity:activity-compose:1.7.2")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.1")
+    implementation("androidx.lifecycle:lifecycle-runtime-compose:2.6.1")
 }

step4/androidApp/src/main/java/com/jetbrains/simplelogin/kotlinmultiplatformsandbox/MainActivity.kt

@@ -1,17 +1,22 @@
 package com.jetbrains.simplelogin.kotlinmultiplatformsandbox
 
-import Greeting
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
+import androidx.activity.viewModels
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Surface
 import androidx.compose.material.Text
-import androidx.compose.runtime.*
 import androidx.compose.ui.Modifier
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
 
 class MainActivity : ComponentActivity() {
+
+    private val viewModel: MainViewModel by viewModels()
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContent {
@@ -20,15 +25,16 @@ class MainActivity : ComponentActivity() {
                     modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colors.background
                 ) {
-                    var text by remember { mutableStateOf("Loading") }
-                    LaunchedEffect(true) {
-                        text = try {
-                            Greeting().greet()
-                        } catch (e: Exception) {
-                            e.localizedMessage ?: "error"
+                    val greetings = viewModel.greetingList.collectAsStateWithLifecycle()
+                    if (greetings.value.isEmpty()) {
+                        Text("Loading")
+                    } else {
+                        LazyColumn {
+                            items(greetings.value) {
+                                Text(it)
+                            }
                         }
                     }
-                    Text(text)
                 }
             }
         }

step4/androidApp/src/main/java/com/jetbrains/simplelogin/kotlinmultiplatformsandbox/MainViewModel.kt

@@ -0,0 +1,14 @@
+package com.jetbrains.simplelogin.kotlinmultiplatformsandbox
+
+import Greeting
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.stateIn
+
+class MainViewModel : ViewModel() {
+
+    val greetingList: StateFlow<List<String>> = Greeting().greet().stateIn(viewModelScope, SharingStarted.Eagerly, emptyList())
+
+}