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wip trying to implement jwilson's idea in workflow
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‎samples/containers/thingy/build.gradle.kts‎

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plugins {
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id("com.android.application")
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id("kotlin-android")
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id("android-sample-app")
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id("android-ui-tests")
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id("kotlin-parcelize")
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}
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android {
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defaultConfig {
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applicationId = "com.squareup.sample.thingy"
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}
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namespace = "com.squareup.sample.thingy"
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}
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dependencies {
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debugImplementation(libs.squareup.leakcanary.android)
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implementation(libs.androidx.activity.ktx)
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implementation(project(":samples:containers:android"))
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implementation(project(":workflow-ui:core-android"))
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implementation(project(":workflow-ui:core-common"))
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}

‎samples/containers/thingy/lint-baseline.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<issues format="6" by="lint 7.4.1" type="baseline" client="gradle" dependencies="false" name="AGP (7.4.1)" variant="all" version="7.4.1">
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<issue
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id="UnusedAttribute"
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message="Attribute `autoSizeTextType` is only used in API level 26 and higher (current min is 21)"
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errorLine1=" android:autoSizeTextType=&quot;uniform&quot;"
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errorLine2=" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
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<location
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file="src/main/res/layout/hello_back_button_layout.xml"
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line="12"
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column="7"/>
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</issue>
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<issue
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id="DataExtractionRules"
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message="The attribute `android:allowBackup` is deprecated from Android 12 and higher and may be removed in future versions. Consider adding the attribute `android:dataExtractionRules` specifying an `@xml` resource which configures cloud backups and device transfers on Android 12 and higher."
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errorLine1=" android:allowBackup=&quot;false&quot;"
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errorLine2=" ~~~~~">
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<location
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file="src/main/AndroidManifest.xml"
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line="6"
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column="28"/>
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</issue>
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</issues>

‎samples/containers/thingy/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools">
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<application
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android:allowBackup="false"
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android:label="@string/app_name"
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android:theme="@style/AppTheme"
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tools:ignore="GoogleAppIndexingWarning,MissingApplicationIcon"
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>
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<activity android:name=".HelloBackButtonActivity"
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android:exported="true">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎samples/containers/thingy/src/main/java/com/squareup/sample/thingy/HelloBackButtonActivity.kt‎

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@file:OptIn(WorkflowExperimentalRuntime::class)
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package com.squareup.sample.thingy
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import android.os.Bundle
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import androidx.activity.viewModels
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import androidx.appcompat.app.AppCompatActivity
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import androidx.lifecycle.SavedStateHandle
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import androidx.lifecycle.ViewModel
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import androidx.lifecycle.lifecycleScope
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import androidx.lifecycle.viewModelScope
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import com.squareup.sample.container.SampleContainers
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import com.squareup.workflow1.WorkflowExperimentalRuntime
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import com.squareup.workflow1.android.renderWorkflowIn
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import com.squareup.workflow1.config.AndroidRuntimeConfigTools
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import com.squareup.workflow1.ui.Screen
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import com.squareup.workflow1.ui.navigation.reportNavigation
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import com.squareup.workflow1.ui.withRegistry
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import com.squareup.workflow1.ui.workflowContentView
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import kotlinx.coroutines.Job
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.map
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import kotlinx.coroutines.launch
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import timber.log.Timber
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private val viewRegistry = SampleContainers
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class HelloBackButtonActivity : AppCompatActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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val model: HelloBackButtonModel by viewModels()
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workflowContentView.take(lifecycle, model.renderings.map { it.withRegistry(viewRegistry) })
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lifecycleScope.launch {
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model.waitForExit()
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finish()
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}
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}
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companion object {
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init {
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Timber.plant(Timber.DebugTree())
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}
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}
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}
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class HelloBackButtonModel(savedState: SavedStateHandle) : ViewModel() {
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private val running = Job()
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val renderings: Flow<Screen> by lazy {
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renderWorkflowIn(
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workflow = TODO("MyWorkflow()"),
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scope = viewModelScope,
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savedStateHandle = savedState,
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runtimeConfig = AndroidRuntimeConfigTools.getAppWorkflowRuntimeConfig()
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) {
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// This workflow handles the back button itself, so the activity can't.
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// Instead, the workflow emits an output to signal that it's time to shut things down.
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running.complete()
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}.reportNavigation {
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Timber.i("Navigated to %s", it)
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}
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}
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/** Blocks until the workflow signals that it's time to shut things down. */
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suspend fun waitForExit() = running.join()
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}

‎samples/containers/thingy/src/main/java/com/squareup/sample/thingy/MyWorkflow.kt‎

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package com.squareup.sample.thingy
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import com.squareup.workflow1.Workflow
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import com.squareup.workflow1.ui.Screen
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import kotlinx.coroutines.delay
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import kotlinx.coroutines.launch
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import kotlin.time.Duration.Companion.seconds
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enum class MyOutputs {
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Back,
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Done,
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}
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fun MyWorkflow(
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child1: Workflow<Unit, String, Screen>,
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child2: Workflow<Unit, String, Screen>,
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child3: Workflow<String, Nothing, Screen>,
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networkCall: suspend (String) -> String
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) = thingyWorkflow<String, MyOutputs> {
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// Step 1
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showWorkflow(child1) { output ->
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when (output) {
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"back" -> emitOutput(MyOutputs.Back)
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"next" -> {
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// Step 2
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val childResult = showWorkflow(child2) { output ->
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if (output == "back") {
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// Removes child2 from the stack, cancels the output handler from step 1, and just
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// leaves child1 rendering.
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goBack()
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} else {
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finishWith(output)
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}
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}
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// TODO: Show a loading screen automatically.
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val networkResult = networkCall(childResult)
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// Step 3: Show a workflow for 3 seconds then finish.
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launch {
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delay(3.seconds)
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emitOutput(MyOutputs.Done)
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}
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showWorkflow(child3, networkResult) {}
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}
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else -> {}
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}
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}
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}

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