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Take a look at Jetpack Glance Piotr Prus Mobile Tech Lead @Airly GDG 3City Organizer

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Agenda: • Introduction to widgets • Widget providers • Composing widget UI • State management • Trigger widget update • Change state outside widget class • Initial con fi guration • Open from widget • Why we still need XML • Thoughts and conclusion

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Introduction to widgets

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Widgets 84 % API 1 RemoteViews Jetpack Glance

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No content

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androidx.glance:glance-appwidget:1.0.0-alpha03

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androidx.glance:glance-appwidget:1.0.0-alpha03

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androidx.glance:glance-appwidget:1.0.0-alpha03 android { buildFeatures { compose = true } composeOptions { kotlinCompilerExtensionVersion = "1.1.0-beta03" } kotlinOptions { jvmTarget = "1.8" } }

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Widget providers

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class TestWidgetProvider : AppWidgetProvider() { override fun onReceive(context: Context?, intent: Intent?) { super.onReceive(context, intent) } override fun onUpdate( context: Context?, appWidgetManager: AppWidgetManager?, appWidgetIds: IntArray? ) { super.onUpdate(context, appWidgetManager, appWidgetIds) } }

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class TestWidgetProvider : AppWidgetProvider() { override fun onReceive(context: Context?, intent: Intent?) { super.onReceive(context, intent) } override fun onUpdate( context: Context?, appWidgetManager: AppWidgetManager?, appWidgetIds: IntArray? ) { super.onUpdate(context, appWidgetManager, appWidgetIds) } }

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class TestWidgetProvider : AppWidgetProvider() { override fun onReceive(context: Context?, intent: Intent?) { super.onReceive(context, intent) } override fun onUpdate( context: Context?, appWidgetManager: AppWidgetManager?, appWidgetIds: IntArray? ) { super.onUpdate(context, appWidgetManager, appWidgetIds) } }

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class TestWidgetProvider : AppWidgetProvider() { override fun onReceive(context: Context?, intent: Intent?) { super.onReceive(context, intent) } override fun onUpdate( context: Context?, appWidgetManager: AppWidgetManager?, appWidgetIds: IntArray? ) { super.onUpdate(context, appWidgetManager, appWidgetIds) } }

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class TestWidgetProvider : AppWidgetProvider() { override fun onReceive(context: Context?, intent: Intent?) { super.onReceive(context, intent) } override fun onUpdate( context: Context?, appWidgetManager: AppWidgetManager?, appWidgetIds: IntArray? ) { super.onUpdate(context, appWidgetManager, appWidgetIds) } } class WeatherWidgetReceiver : GlanceAppWidgetReceiver() { override val glanceAppWidget: GlanceAppWidget get() = WeatherWidget() }

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Composing widget UI

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data class WidgetState( val data: WeatherItem, val loading: Boolean, ) data class WeatherItem( val address: String? = null, val latitude: Double, val longitude: Double, val temperature: Int, val windSpeed: Int, val humidity: Int, val pressure: Int )

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class WeatherWidget : GlanceAppWidget() { @Composable override fun Content() {} }

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class WeatherWidget(private val state: WidgetState) : GlanceAppWidget() { @Composable override fun Content() {} }

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class WeatherWidget(private val state: WidgetState) : GlanceAppWidget() { @Composable override fun Content() { Box( modifier = GlanceModifier.fillMaxSize() .background(ImageProvider(resId = R.drawable.shape_widget_small)) .appWidgetBackground(), contentAlignment = Alignment.Center ) { WidgetBody(state = state) } } }

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class WeatherWidget(private val state: WidgetState) : GlanceAppWidget() { @Composable override fun Content() { Box( modifier = GlanceModifier.fillMaxSize() .background(ImageProvider(resId = R.drawable.shape_widget_small)) .appWidgetBackground(), contentAlignment = Alignment.Center ) { WidgetBody(state = state) } } }

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class WeatherWidget(private val state: WidgetState) : GlanceAppWidget() { @Composable override fun Content() { Box( modifier = GlanceModifier.fillMaxSize() .cornerRadius(8.dp) .appWidgetBackground(), contentAlignment = Alignment.Center ) { WidgetBody(state = state) } } }

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class WeatherWidget(private val state: WidgetState) : GlanceAppWidget() { @Composable override fun Content() { Box( modifier = GlanceModifier.fillMaxSize() .cornerRadius(8.dp) .appWidgetBackground(), contentAlignment = Alignment.Center ) { WidgetBody(state = state) } } } Min API 31

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@Composable fun WidgetBody(state: WidgetState) { Column() { Row() { Image() Spacer() Text() Spacer() Image() } Spacer() Row() { Image() Spacer() Text() Spacer() Image() Spacer() Text() } } } import androidx.glance.Image import androidx.glance.layout.Column import androidx.glance.layout.Row import androidx.glance.layout.Spacer import androidx.glance.text.Text

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Glance components: • Column • LazyColumn • Row • Box • Image • CircularProgressIndicator • Text • Button • Spacer Glance modi fi er: • Height • Width • Size • Padding • Background • Corner radius • Visibility • Clickable

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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Image( modifier = GlanceModifier.size(12.dp), provider = ImageProvider(resId = R.drawable.outline_location_on_24), contentDescription = "Location icon" ) Spacer(modifier = GlanceModifier.width(4.dp)) Text( modifier = GlanceModifier.fillMaxWidth().defaultWeight(), text = state.data.address ?: "null", style = TextStyle( fontWeight = FontWeight.Normal, fontSize = 10.sp, textAlign = TextAlign.Start, color = ColorProvider(day = Color.Black, night = Color.White) ), maxLines = 1 )

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State management

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Widget GlanceStateDe fi nition Preferences by default GlanceId internal data class AppWidgetId(val appWidgetId: Int) : GlanceId

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SAVE Preferences prefs[doublePreferencesKey(widgetLatitudeKey)] = 54.40 prefs[doublePreferencesKey(widgetLongitudeKey)] = 18.3 GET val latitude = prefs[doublePreferencesKey(widgetLatitudeKey)] ?: Double.MIN_VALUE val longitude = prefs[doublePreferencesKey(widgetLongitudeKey)] ?: Double.MIN_VALUE

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object WidgetStateHelper { fun save(prefs: MutablePreferences, state: WeatherItem) {} fun saveLocation(prefs: MutablePreferences, latitude: Double, longitude: Double) {} fun isStored(prefs: MutablePreferences, latitude: Double, longitude: Double): Boolean = prefs[doublePreferencesKey(WidgetStateHelper.widgetLatitudeKey)] == latitude && prefs[doublePreferencesKey(WidgetStateHelper.widgetLongitudeKey)] == longitude fun setLoading(prefs: MutablePreferences, loading: Boolean) {} }

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object WidgetStateHelper { fun getState(prefs: Preferences): WidgetState { val address = prefs[stringPreferencesKey(WidgetStateHelper.widgetAddressKey)] ?: "" val latitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLatitudeKey)] ?: Double.MIN_VALUE val longitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLongitudeKey)] ?: Double.MIN_VALUE val temperature = prefs[intPreferencesKey(WidgetStateHelper.widgetTemperatureKey)] ?: Int.MIN_VALUE val humidity = prefs[intPreferencesKey(WidgetStateHelper.widgetHumidityKey)] ?: Int.MIN_VALUE val wind = prefs[intPreferencesKey(WidgetStateHelper.widgetWindKey)] ?: Int.MIN_VALUE val loading = prefs[booleanPreferencesKey(WidgetStateHelper.widgetLoadingKey)] ?: false return WidgetState( data = WeatherItem( address = address, latitude = latitude, longitude = longitude, temperature = temperature, windSpeed = wind, humidity = humidity, pressure = 0 ), loading = loading ) }

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object WidgetStateHelper { fun getState(prefs: Preferences): WidgetState { val address = prefs[stringPreferencesKey(WidgetStateHelper.widgetAddressKey)] ?: "" val latitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLatitudeKey)] ?: Double.MIN_VALUE val longitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLongitudeKey)] ?: Double.MIN_VALUE val temperature = prefs[intPreferencesKey(WidgetStateHelper.widgetTemperatureKey)] ?: Int.MIN_VALUE val humidity = prefs[intPreferencesKey(WidgetStateHelper.widgetHumidityKey)] ?: Int.MIN_VALUE val wind = prefs[intPreferencesKey(WidgetStateHelper.widgetWindKey)] ?: Int.MIN_VALUE val loading = prefs[booleanPreferencesKey(WidgetStateHelper.widgetLoadingKey)] ?: false return WidgetState( data = WeatherItem( address = address, latitude = latitude, longitude = longitude, temperature = temperature, windSpeed = wind, humidity = humidity, pressure = 0 ), loading = loading ) }

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object WidgetStateHelper { fun getState(prefs: Preferences): WidgetState { val address = prefs[stringPreferencesKey(WidgetStateHelper.widgetAddressKey)] ?: "" val latitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLatitudeKey)] ?: Double.MIN_VALUE val longitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLongitudeKey)] ?: Double.MIN_VALUE val temperature = prefs[intPreferencesKey(WidgetStateHelper.widgetTemperatureKey)] ?: Int.MIN_VALUE val humidity = prefs[intPreferencesKey(WidgetStateHelper.widgetHumidityKey)] ?: Int.MIN_VALUE val wind = prefs[intPreferencesKey(WidgetStateHelper.widgetWindKey)] ?: Int.MIN_VALUE val loading = prefs[booleanPreferencesKey(WidgetStateHelper.widgetLoadingKey)] ?: false return WidgetState( data = WeatherItem( address = address, latitude = latitude, longitude = longitude, temperature = temperature, windSpeed = wind, humidity = humidity, pressure = 0 ), loading = loading ) }

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object WidgetStateHelper { fun getState(prefs: Preferences): WidgetState { val address = prefs[stringPreferencesKey(WidgetStateHelper.widgetAddressKey)] ?: "" val latitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLatitudeKey)] ?: Double.MIN_VALUE val longitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLongitudeKey)] ?: Double.MIN_VALUE val temperature = prefs[intPreferencesKey(WidgetStateHelper.widgetTemperatureKey)] ?: Int.MIN_VALUE val humidity = prefs[intPreferencesKey(WidgetStateHelper.widgetHumidityKey)] ?: Int.MIN_VALUE val wind = prefs[intPreferencesKey(WidgetStateHelper.widgetWindKey)] ?: Int.MIN_VALUE val loading = prefs[booleanPreferencesKey(WidgetStateHelper.widgetLoadingKey)] ?: false return WidgetState( data = WeatherItem( address = address, latitude = latitude, longitude = longitude, temperature = temperature, windSpeed = wind, humidity = humidity, pressure = 0 ), loading = loading ) }

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object WidgetStateHelper { fun getState(prefs: Preferences): WidgetState { val address = prefs[stringPreferencesKey(WidgetStateHelper.widgetAddressKey)] ?: "" val latitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLatitudeKey)] ?: Double.MIN_VALUE val longitude = prefs[doublePreferencesKey(WidgetStateHelper.widgetLongitudeKey)] ?: Double.MIN_VALUE val temperature = prefs[intPreferencesKey(WidgetStateHelper.widgetTemperatureKey)] ?: Int.MIN_VALUE val humidity = prefs[intPreferencesKey(WidgetStateHelper.widgetHumidityKey)] ?: Int.MIN_VALUE val wind = prefs[intPreferencesKey(WidgetStateHelper.widgetWindKey)] ?: Int.MIN_VALUE val loading = prefs[booleanPreferencesKey(WidgetStateHelper.widgetLoadingKey)] ?: false return WidgetState( data = WeatherItem( address = address, latitude = latitude, longitude = longitude, temperature = temperature, windSpeed = wind, humidity = humidity, pressure = 0 ), loading = loading ) }

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class WeatherWidget(private val state: WidgetState) : GlanceAppWidget() { @Composable override fun Content() {} }

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class WeatherWidget() : GlanceAppWidget() { @Composable override fun Content() { val state = WidgetStateHelper.getState(currentState()) } }

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class WeatherWidget() : GlanceAppWidget() { @Composable override fun Content() { val state = WidgetStateHelper.getState(currentState()) } } Retrieves the current customisable store for view speci fi c state data as de fi ned by GlanceStateDe fi nition in the surface implementation.

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Trigger widget update

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Update state Trigger composition public suspend fun updateAppWidgetState( context: Context, glanceId: GlanceId, updateState: suspend (MutablePreferences) -> Unit, ) { updateAppWidgetState(context, PreferencesGlanceStateDefinition, glanceId) { it.toMutablePreferences().apply { updateState(this) } } } public suspend fun update(context: Context, glanceId: GlanceId) { require(glanceId is AppWidgetId) { "The glanceId '$glanceId' is not a valid App Widget glance id" } update(context, AppWidgetManager.getInstance(context), glanceId.appWidgetId) }

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Where should we make computation for the widget ? Widget Service ViewModel BroadcastReceiver WorkManager

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Where should we make computation for the widget ? Widget Service ViewModel BroadcastReceiver WorkManager

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Where should we make computation for the widget ? Widget Service ViewModel BroadcastReceiver WorkManager

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Widget View Networking Local database Calculations

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How to trigger the update? Image( modifier = GlanceModifier.size(32.dp).padding(6.dp) .clickable(onClick = actionRunCallback()), provider = ImageProvider(resId = R.drawable.ic_refresh), contentDescription = "Refresh icon" )

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How to trigger the update? Image( modifier = GlanceModifier.size(32.dp).padding(6.dp) .clickable(onClick = actionRunCallback()), provider = ImageProvider(resId = R.drawable.ic_refresh), contentDescription = "Refresh icon" )

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How to trigger the update? Image( modifier = GlanceModifier.size(32.dp).padding(6.dp) .clickable(onClick = actionRunCallback()), provider = ImageProvider(resId = R.drawable.ic_refresh), contentDescription = "Refresh icon" ) class WidgetRefreshAction : ActionCallback { override suspend fun onRun(context: Context, glanceId: GlanceId, parameters: ActionParameters) { } }

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class WidgetRefreshAction : ActionCallback { override suspend fun onRun(context: Context, glanceId: GlanceId, parameters: ActionParameters) { val prefs = WeatherWidget().getAppWidgetState(context, glanceId) val location = WidgetStateHelper.getState(prefs).let { it.data.latitude to it.data.longitude } val oneTimeWorkRequest = OneTimeWorkRequestBuilder() .setInputData( WeatherWidgetWorker.buildData( latitude = location.first, longitude = location.second ) ) .build() WorkManager.getInstance(context) .enqueue(oneTimeWorkRequest) } }

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class WidgetRefreshAction : ActionCallback { override suspend fun onRun(context: Context, glanceId: GlanceId, parameters: ActionParameters) { val prefs = WeatherWidget().getAppWidgetState(context, glanceId) val location = WidgetStateHelper.getState(prefs).let { it.data.latitude to it.data.longitude } val oneTimeWorkRequest = OneTimeWorkRequestBuilder() .setInputData( WeatherWidgetWorker.buildData( latitude = location.first, longitude = location.second ) ) .build() WorkManager.getInstance(context) .enqueue(oneTimeWorkRequest) } }

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class WidgetRefreshAction : ActionCallback { override suspend fun onRun(context: Context, glanceId: GlanceId, parameters: ActionParameters) { val prefs = WeatherWidget().getAppWidgetState(context, glanceId) val location = WidgetStateHelper.getState(prefs).let { it.data.latitude to it.data.longitude } val oneTimeWorkRequest = OneTimeWorkRequestBuilder() .setInputData( WeatherWidgetWorker.buildData( latitude = location.first, longitude = location.second ) ) .build() WorkManager.getInstance(context) .enqueue(oneTimeWorkRequest) } }

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class WidgetRefreshAction : ActionCallback { override suspend fun onRun(context: Context, glanceId: GlanceId, parameters: ActionParameters) { val prefs = WeatherWidget().getAppWidgetState(context, glanceId) val location = WidgetStateHelper.getState(prefs).let { it.data.latitude to it.data.longitude } val oneTimeWorkRequest = OneTimeWorkRequestBuilder() .setInputData( WeatherWidgetWorker.buildData( latitude = location.first, longitude = location.second ) ) .build() WorkManager.getInstance(context) .enqueue(oneTimeWorkRequest) } }

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class WidgetRefreshAction : ActionCallback { override suspend fun onRun(context: Context, glanceId: GlanceId, parameters: ActionParameters) { val prefs = WeatherWidget().getAppWidgetState(context, glanceId) val location = WidgetStateHelper.getState(prefs).let { it.data.latitude to it.data.longitude } val oneTimeWorkRequest = OneTimeWorkRequestBuilder() .setInputData( WeatherWidgetWorker.buildData( latitude = location.first, longitude = location.second ) ) .build() WorkManager.getInstance(context) .enqueue(oneTimeWorkRequest) } }

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class WidgetRefreshAction : ActionCallback { override suspend fun onRun(context: Context, glanceId: GlanceId, parameters: ActionParameters) { val prefs = WeatherWidget().getAppWidgetState(context, glanceId) val location = WidgetStateHelper.getState(prefs).let { it.data.latitude to it.data.longitude } val oneTimeWorkRequest = OneTimeWorkRequestBuilder() .setInputData( WeatherWidgetWorker.buildData( latitude = location.first, longitude = location.second ) ) .build() WorkManager.getInstance(context) .enqueue(oneTimeWorkRequest) } }

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Change state outside widget class

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WeatherWidget().updateAppWidgetState(appContext, glanceId) { prefs -> // Update state } // Trigger composition of Content() WeatherWidget().update(appContext, glanceId) private suspend fun updateWidgetState( glanceId: GlanceId, update: (MutablePreferences) -> Unit ) { WeatherWidget().apply { updateAppWidgetState(appContext, glanceId) { update(it) } update(appContext, glanceId) } }

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class WeatherWidgetWorker( private val repository: WeatherRepository, private val appContext: Context, private val workerParameters: WorkerParameters ) : CoroutineWorker(appContext, workerParameters) {

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class WeatherWidgetWorker( private val repository: WeatherRepository, private val appContext: Context, private val workerParameters: WorkerParameters ) : CoroutineWorker(appContext, workerParameters) { override suspend fun doWork(): Result { return getLocation()?.let { locationPair -> val glanceId = GlanceAppWidgetManager(appContext) .getGlanceIds(WeatherWidget::class.java).firstOrNull { id -> WeatherWidget().getAppWidgetState( appContext, id ).let { prefs -> WidgetStateHelper.isStored( prefs, latitude = locationPair.first, longitude = locationPair.second ) } } ?: return Result.failure() updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) }

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class WeatherWidgetWorker( private val repository: WeatherRepository, private val appContext: Context, private val workerParameters: WorkerParameters ) : CoroutineWorker(appContext, workerParameters) { override suspend fun doWork(): Result { return getLocation()?.let { locationPair -> val glanceId = GlanceAppWidgetManager(appContext) .getGlanceIds(WeatherWidget::class.java).firstOrNull { id -> WeatherWidget().getAppWidgetState( appContext, id ).let { prefs -> WidgetStateHelper.isStored( prefs, latitude = locationPair.first, longitude = locationPair.second ) } } ?: return Result.failure() updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) }

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class WeatherWidgetWorker( private val repository: WeatherRepository, private val appContext: Context, private val workerParameters: WorkerParameters ) : CoroutineWorker(appContext, workerParameters) { override suspend fun doWork(): Result { return getLocation()?.let { locationPair -> val glanceId = GlanceAppWidgetManager(appContext) .getGlanceIds(WeatherWidget::class.java).firstOrNull { id -> WeatherWidget().getAppWidgetState( appContext, id ).let { prefs -> WidgetStateHelper.isStored( prefs, latitude = locationPair.first, longitude = locationPair.second ) } } ?: return Result.failure() updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) }

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class WeatherWidgetWorker( private val repository: WeatherRepository, private val appContext: Context, private val workerParameters: WorkerParameters ) : CoroutineWorker(appContext, workerParameters) { override suspend fun doWork(): Result { return getLocation()?.let { locationPair -> val glanceId = GlanceAppWidgetManager(appContext) .getGlanceIds(WeatherWidget::class.java).firstOrNull { id -> WeatherWidget().getAppWidgetState( appContext, id ).let { prefs -> WidgetStateHelper.isStored( prefs, latitude = locationPair.first, longitude = locationPair.second ) } } ?: return Result.failure() updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) }

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class WeatherWidgetWorker( private val repository: WeatherRepository, private val appContext: Context, private val workerParameters: WorkerParameters ) : CoroutineWorker(appContext, workerParameters) { override suspend fun doWork(): Result { return getLocation()?.let { locationPair -> val glanceId = GlanceAppWidgetManager(appContext) .getGlanceIds(WeatherWidget::class.java).firstOrNull { id -> WeatherWidget().getAppWidgetState( appContext, id ).let { prefs -> WidgetStateHelper.isStored( prefs, latitude = locationPair.first, longitude = locationPair.second ) } } ?: return Result.failure() updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) }

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class WeatherWidgetWorker( private val repository: WeatherRepository, private val appContext: Context, private val workerParameters: WorkerParameters ) : CoroutineWorker(appContext, workerParameters) { override suspend fun doWork(): Result { return getLocation()?.let { locationPair -> val glanceId = GlanceAppWidgetManager(appContext) .getGlanceIds(WeatherWidget::class.java).firstOrNull { id -> WeatherWidget().getAppWidgetState( appContext, id ).let { prefs -> WidgetStateHelper.isStored( prefs, latitude = locationPair.first, longitude = locationPair.second ) } } ?: return Result.failure() updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) }

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class WeatherWidgetWorker( private val repository: WeatherRepository, private val appContext: Context, private val workerParameters: WorkerParameters ) : CoroutineWorker(appContext, workerParameters) { override suspend fun doWork(): Result { return getLocation()?.let { locationPair -> val glanceId = GlanceAppWidgetManager(appContext) .getGlanceIds(WeatherWidget::class.java).firstOrNull { id -> WeatherWidget().getAppWidgetState( appContext, id ).let { prefs -> WidgetStateHelper.isStored( prefs, latitude = locationPair.first, longitude = locationPair.second ) } } ?: return Result.failure() updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) }

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override suspend fun doWork(): Result { … updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) } repository.getData(latitude = locationPair.first, longitude = locationPair.second) .onSuccess { item -> updateWidgetState(glanceId) { WidgetStateHelper.save(it, item) } return Result.success() } .onFailure { throwable -> updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, false) } return Result.retry() }

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override suspend fun doWork(): Result { … updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) } repository.getData(latitude = locationPair.first, longitude = locationPair.second) .onSuccess { item -> updateWidgetState(glanceId) { WidgetStateHelper.save(it, item) } return Result.success() } .onFailure { throwable -> updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, false) } return Result.retry() }

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override suspend fun doWork(): Result { … updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, true) } repository.getData(latitude = locationPair.first, longitude = locationPair.second) .onSuccess { item -> updateWidgetState(glanceId) { WidgetStateHelper.save(it, item) } return Result.success() } .onFailure { throwable -> updateWidgetState(glanceId) { WidgetStateHelper.setLoading(it, false) } return Result.retry() }

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Initial configuration

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data class PlaceItem( val name: String, val latitude: Double, val longitude: Double )

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lifecycleScope.launch { val glanceId = GlanceAppWidgetManager(context).getGlanceIds( WeatherWidget::class.java ).last() WeatherWidget().apply { updateAppWidgetState(context, glanceId) { WidgetStateHelper.saveLocation(it, latitude = item.latitude, longitude = item.longitude) WidgetStateHelper.saveAddress(it, address = item.name) } update(context, glanceId) } startWeatherWorker(latitude = item.latitude, longitude = item.longitude) setResult(RESULT_OK, intent) finish() } On item click

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lifecycleScope.launch { val glanceId = GlanceAppWidgetManager(context).getGlanceIds( WeatherWidget::class.java ).last() WeatherWidget().apply { updateAppWidgetState(context, glanceId) { WidgetStateHelper.saveLocation(it, latitude = item.latitude, longitude = item.longitude) WidgetStateHelper.saveAddress(it, address = item.name) } update(context, glanceId) } startWeatherWorker(latitude = item.latitude, longitude = item.longitude) setResult(RESULT_OK, intent) finish() } On item click

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lifecycleScope.launch { val glanceId = GlanceAppWidgetManager(context).getGlanceIds( WeatherWidget::class.java ).last() WeatherWidget().apply { updateAppWidgetState(context, glanceId) { WidgetStateHelper.saveLocation(it, latitude = item.latitude, longitude = item.longitude) WidgetStateHelper.saveAddress(it, address = item.name) } update(context, glanceId) } startWeatherWorker(latitude = item.latitude, longitude = item.longitude) setResult(RESULT_OK, intent) finish() } On item click

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lifecycleScope.launch { val glanceId = GlanceAppWidgetManager(context).getGlanceIds( WeatherWidget::class.java ).last() WeatherWidget().apply { updateAppWidgetState(context, glanceId) { WidgetStateHelper.saveLocation(it, latitude = item.latitude, longitude = item.longitude) WidgetStateHelper.saveAddress(it, address = item.name) } update(context, glanceId) } startWeatherWorker(latitude = item.latitude, longitude = item.longitude) setResult(RESULT_OK, intent) finish() } On item click

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lifecycleScope.launch { val glanceId = GlanceAppWidgetManager(context).getGlanceIds( WeatherWidget::class.java ).last() WeatherWidget().apply { updateAppWidgetState(context, glanceId) { WidgetStateHelper.saveLocation(it, latitude = item.latitude, longitude = item.longitude) WidgetStateHelper.saveAddress(it, address = item.name) } update(context, glanceId) } startWeatherWorker(latitude = item.latitude, longitude = item.longitude) setResult(RESULT_OK, intent) finish() } On item click

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lifecycleScope.launch { val glanceId = GlanceAppWidgetManager(context).getGlanceIds( WeatherWidget::class.java ).last() WeatherWidget().apply { updateAppWidgetState(context, glanceId) { WidgetStateHelper.saveLocation(it, latitude = item.latitude, longitude = item.longitude) WidgetStateHelper.saveAddress(it, address = item.name) } update(context, glanceId) } startWeatherWorker(latitude = item.latitude, longitude = item.longitude) setResult(RESULT_OK, intent) finish() } On item click

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lifecycleScope.launch { val glanceId = GlanceAppWidgetManager(context).getGlanceIds( WeatherWidget::class.java ).last() WeatherWidget().apply { updateAppWidgetState(context, glanceId) { WidgetStateHelper.saveLocation(it, latitude = item.latitude, longitude = item.longitude) WidgetStateHelper.saveAddress(it, address = item.name) } update(context, glanceId) } startWeatherWorker(latitude = item.latitude, longitude = item.longitude) setResult(RESULT_OK, intent) finish() } On item click

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lifecycleScope.launch { val glanceId = GlanceAppWidgetManager(context).getGlanceIds( WeatherWidget::class.java ).last() WeatherWidget().apply { updateAppWidgetState(context, glanceId) { WidgetStateHelper.saveLocation(it, latitude = item.latitude, longitude = item.longitude) WidgetStateHelper.saveAddress(it, address = item.name) } update(context, glanceId) } startWeatherWorker(latitude = item.latitude, longitude = item.longitude) setResult(RESULT_OK, intent) finish() } On item click

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fun Context.startWeatherWorker(latitude: Double, longitude: Double) { val networkConstraint = Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build() val request = PeriodicWorkRequest .Builder(WeatherWidgetWorker::class.java, 15, TimeUnit.MINUTES) .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 5000L, TimeUnit.MILLISECONDS) .setInputData( WeatherWidgetWorker.buildData(latitude, longitude) ) .setConstraints(networkConstraint) .build() val uniqueTag = WeatherWidget.UNIQUE_WORK_TAG + "_$latitude" + "_$longitude" WorkManager.getInstance(this) .enqueueUniquePeriodicWork( uniqueTag, ExistingPeriodicWorkPolicy.REPLACE, request ) }

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fun Context.startWeatherWorker(latitude: Double, longitude: Double) { val networkConstraint = Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build() val request = PeriodicWorkRequest .Builder(WeatherWidgetWorker::class.java, 15, TimeUnit.MINUTES) .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 5000L, TimeUnit.MILLISECONDS) .setInputData( WeatherWidgetWorker.buildData(latitude, longitude) ) .setConstraints(networkConstraint) .build() val uniqueTag = WeatherWidget.UNIQUE_WORK_TAG + "_$latitude" + "_$longitude" WorkManager.getInstance(this) .enqueueUniquePeriodicWork( uniqueTag, ExistingPeriodicWorkPolicy.REPLACE, request ) }

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fun Context.startWeatherWorker(latitude: Double, longitude: Double) { val networkConstraint = Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build() val request = PeriodicWorkRequest .Builder(WeatherWidgetWorker::class.java, 15, TimeUnit.MINUTES) .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 5000L, TimeUnit.MILLISECONDS) .setInputData( WeatherWidgetWorker.buildData(latitude, longitude) ) .setConstraints(networkConstraint) .build() val uniqueTag = WeatherWidget.UNIQUE_WORK_TAG + "_$latitude" + "_$longitude" WorkManager.getInstance(this) .enqueueUniquePeriodicWork( uniqueTag, ExistingPeriodicWorkPolicy.REPLACE, request ) }

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fun Context.startWeatherWorker(latitude: Double, longitude: Double) { val networkConstraint = Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build() val request = PeriodicWorkRequest .Builder(WeatherWidgetWorker::class.java, 15, TimeUnit.MINUTES) .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 5000L, TimeUnit.MILLISECONDS) .setInputData( WeatherWidgetWorker.buildData(latitude, longitude) ) .setConstraints(networkConstraint) .build() val uniqueTag = WeatherWidget.UNIQUE_WORK_TAG + "_$latitude" + "_$longitude" WorkManager.getInstance(this) .enqueueUniquePeriodicWork( uniqueTag, ExistingPeriodicWorkPolicy.REPLACE, request ) }

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fun Context.startWeatherWorker(latitude: Double, longitude: Double) { val networkConstraint = Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build() val request = PeriodicWorkRequest .Builder(WeatherWidgetWorker::class.java, 15, TimeUnit.MINUTES) .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 5000L, TimeUnit.MILLISECONDS) .setInputData( WeatherWidgetWorker.buildData(latitude, longitude) ) .setConstraints(networkConstraint) .build() val uniqueTag = WeatherWidget.UNIQUE_WORK_TAG + "_$latitude" + "_$longitude" WorkManager.getInstance(this) .enqueueUniquePeriodicWork( uniqueTag, ExistingPeriodicWorkPolicy.REPLACE, request ) }

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fun Context.startWeatherWorker(latitude: Double, longitude: Double) { val networkConstraint = Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build() val request = PeriodicWorkRequest .Builder(WeatherWidgetWorker::class.java, 15, TimeUnit.MINUTES) .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 5000L, TimeUnit.MILLISECONDS) .setInputData( WeatherWidgetWorker.buildData(latitude, longitude) ) .setConstraints(networkConstraint) .build() val uniqueTag = WeatherWidget.UNIQUE_WORK_TAG + "_$latitude" + "_$longitude" WorkManager.getInstance(this) .enqueueUniquePeriodicWork( uniqueTag, ExistingPeriodicWorkPolicy.REPLACE, request ) }

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fun Context.startWeatherWorker(latitude: Double, longitude: Double) { val networkConstraint = Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build() val request = PeriodicWorkRequest .Builder(WeatherWidgetWorker::class.java, 15, TimeUnit.MINUTES) .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 5000L, TimeUnit.MILLISECONDS) .setInputData( WeatherWidgetWorker.buildData(latitude, longitude) ) .setConstraints(networkConstraint) .build() val uniqueTag = WeatherWidget.UNIQUE_WORK_TAG + "_$latitude" + "_$longitude" WorkManager.getInstance(this) .enqueueUniquePeriodicWork( uniqueTag, ExistingPeriodicWorkPolicy.REPLACE, request ) }

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fun Context.startWeatherWorker(latitude: Double, longitude: Double) { val networkConstraint = Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build() val request = PeriodicWorkRequest .Builder(WeatherWidgetWorker::class.java, 15, TimeUnit.MINUTES) .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 5000L, TimeUnit.MILLISECONDS) .setInputData( WeatherWidgetWorker.buildData(latitude, longitude) ) .setConstraints(networkConstraint) .build() val uniqueTag = WeatherWidget.UNIQUE_WORK_TAG + "_$latitude" + "_$longitude" WorkManager.getInstance(this) .enqueueUniquePeriodicWork( uniqueTag, ExistingPeriodicWorkPolicy.REPLACE, request ) }

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Open from widget

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Clickable actions: • actionStartActivity • actionRunCallback • actionStartService • actionStartBroadcastReceiver

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Box( modifier = GlanceModifier.fillMaxSize() .background(ImageProvider(resId = R.drawable.shape_widget_small)) .appWidgetBackground() .clickable( onClick = actionStartActivity( activity = MainActivity::class.java, parameters = actionParametersOf( ActionParameters.Key(WidgetConst.LOCATION_WIDGET_LATITUDE) to state.data.latitude, ActionParameters.Key(WidgetConst.LOCATION_WIDGET_LONGITUDE) to state.data.longitude, ActionParameters.Key(WidgetConst.WIDGET_NAME_KEY) to (state.data.address ?: "") ) ) ),

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Box( modifier = GlanceModifier.fillMaxSize() .background(ImageProvider(resId = R.drawable.shape_widget_small)) .appWidgetBackground() .clickable( onClick = actionStartActivity( activity = MainActivity::class.java, parameters = actionParametersOf( ActionParameters.Key(WidgetConst.LOCATION_WIDGET_LATITUDE) to state.data.latitude, ActionParameters.Key(WidgetConst.LOCATION_WIDGET_LONGITUDE) to state.data.longitude, ActionParameters.Key(WidgetConst.WIDGET_NAME_KEY) to (state.data.address ?: "") ) ) ),

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Box( modifier = GlanceModifier.fillMaxSize() .background(ImageProvider(resId = R.drawable.shape_widget_small)) .appWidgetBackground() .clickable( onClick = actionStartActivity( activity = MainActivity::class.java, parameters = actionParametersOf( ActionParameters.Key(WidgetConst.LOCATION_WIDGET_LATITUDE) to state.data.latitude, ActionParameters.Key(WidgetConst.LOCATION_WIDGET_LONGITUDE) to state.data.longitude, ActionParameters.Key(WidgetConst.WIDGET_NAME_KEY) to (state.data.address ?: "") ) ) ),

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Why we still need XML?

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Manifest.xml

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weather_widget_provider.xml

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initial_widget_layout.xml

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icon.xml

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Thoughts and conclusion

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Thoughts and conclusion • We needed this! • It works on composable runtime • Supports android 12 features • It is in alpha3 • Updates are slow • No o ffi cial guidelines regarding state update, etc

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Glance widgets on production app

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Take a look at Jetpack Glance Piotr Prus Mobile Tech Lead @Airly GDG 3City Organizer

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Questions? Piotr Prus Mobile Tech Lead @Airly GDG 3City Organizer https://github.com/PiotrPrus/WeatherGlanceWidget