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Explore new updates on Android Android 13, Compose, Large Screens Google Developer Expert (Android) Senior Engineer @ Lomotif Su Myat Tun Extended Singapore

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Android 13 Mar Jul

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Behaviour changes, new feature & APIs Android 13

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Opt-in notification permission Applies to all newly installed apps, irrespective of targetSDK. For apps with targetSDK < 33, Android will typically ask for the Notification Permission on first launch. Notification Permission Privacy

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App can’t send notification until user uninstall and reinstall your app Selects “Don’t allow”

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Notification Permission ...

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● Request when user is in-context ● Provide rationale before requesting permission ● No additional limits on prompting ● Check notification access through PermissionChecker, or NotificationManager.areNotificationsEnabled UX - Following Best Practices

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Highly requested feature! Dismissable FGS Notifications

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Foreground Services Task Manager ● Removes app from memory ● Stops media playback ● Stops the service, removing associated notification

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No callback sent when user stop app ● REASON_USER_REQUESTED provided in ApplicationExitInfo API

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Long Running FGS Notification ● Invites users to interact with Foreground Services Task Manager

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Behavior “swipe up” and “force stop”

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Other Permission Changes

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● Similar to Bluetooth in Android 12 ○ Same permission group (NEARBY_DEVICES) ● NEARBY_WIFI_DEVICES instead of ACCESS_FINE_LOCATION Updates - Wi-Fi Location Minimization

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Wi-Fi Location Minimization ...

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Wi-Fi Permission - Backward compatibility

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No longer support: ● READ_EXTERNAL_STORAGE ● WRITE_EXTERNAL_STORAGE Media Permission

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Instead of READ_EXTERNAL_STORAGE: ● READ_MEDIA_IMAGE for images ● READ_MEDIA_VIDEO for video ● READ_MEDIA_AUDIO for audio Updates - Media Permission

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If app requests READ_MEDIA_AUDIO: Updates - Audio Permission

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If app requests both or only one permission at the same time: ● READ_MEDIA_IMAGE for images ● READ_MEDIA_VIDEO for video Updates - Media Permission

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Changes - Media Permission

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Storage Permission - Backward compatibility

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Body Sensor - Need Background Permission ...

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Intents - Non-matching Now Blocked Intents are only delivered from external apps to apps targeting Android 13 or higher when they match an element. There are a few exceptions: ● Components without Intent filters ● Intents from the system ● Intents from root

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Preview - matching Intent //intent filter must specify element to accept intents with data val intent = Intent(“previewtwo”) intent.data = Uri.parse("https://android.com") startActivity(intent) +

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Safer Runtime Broadcast Receivers // set new flag while registering a runtime receiver if not SecurityException will be thrown // I want to receive broadcasts from other apps! context.registerReceiver(broadcastReceiver, intentFilter, RECEIVER_EXPORTED); // I don’t want to receive broadcasts from other apps! context.registerReceiver(broadcastReceiver, intentFilter, RECEIVER_NOT_EXPORTED);

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Battery Life is Important Following options appear in setting: Unrestricted Optimised(default) Restricted

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Battery Life is Important Restricted: Favor device battery life over app versatility, places more limitations on what app can do in background

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New Background Rules ● When the system places your app in the restricted ● What work your app can do when the user places your app in the restricted state. ● Check if you’re in one of the restricted states: ○ ActivityManager.isBackgroundRestricted () ○ UsageStatsManager.getAppStandbyBuck et()

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Behavior Changes Summary Without targeting Android 13 ● FGS Task Manager ● Improved prefetch job handling ● Battery resource utilization ● Runtime notifications permission ● Media controls derived from PlaybackState ● In-app language pickers When targeting Android 13 ● Nearby Wi-Fi runtime permission ● Granular media permissions ● Background body sensors permission ● Intent filters block non-matching intents ● Battery resource utilization

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Back better, Monochromatic Icon, much more Feature & APIs

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● Ahead-of-time model allow the system to show preview of the destination ● Deprecated KEYCODE_BACK or onBackPressed APIs Predictable Back Gesture

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Optional opt-in flag in the manifest: Android 13 The new back dispatching will be enabled by default for application targeting SDK 34 Android 14 Once the new behavior is enabled, KEYCODE_BACK and onBackPressed() won't be used anymore. Application will have to rely entirely on the OnBackInvokedCallback Jetpack supports the new Back API androidx.activity:activity:1.6.0 Opt in the new behavior

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Themed App Icons ● Inherit the coloring of user’s choonse wallpaper ● Requires support for adaptive and monochromatic app icons

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● Should be VectorDrawable ● logo fits within 44 x 44 inside 108 x 188, can up to 72 x 72 ● Flag logo Monochromatic icon specifications

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● System settings let user can selects preferred language for your app, not coupling with System language ● API that let apps set different language at runtime Per-app Local Preferences

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In-app language pickers AndroidManifest.xml res\xml\locales_config.xml

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In-app Local Perference val appLocale: LocaleListCompat = LocaleListCompat.forLanguageTags("fr") // Call this on the main thread as it may require Activity.restart() AppCompatDelegate.setApplicationLocales(appLocale) //get in-app local language Val appLocale = AppCompatDelegate.getApplicationLocales() Update in-app local language

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● Recommended way to access user’s photos and videos ● No runtime permissions ● Better UX to access photos & videos ● Continuously improved through Google Play System Updates ● Backported to Android 11 & 12 ● Will soon include cloud photos and albums Photo Picker

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Using the Photo Picker // Launches photo picker in single-select mode. // This means that the user can select one photo or video. val intent = Intent(MediaStore.ACTION_PICK_IMAGES) startActivityForResult(intent, PHOTO_PICKER_REQUEST_CODE)

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Using the Photo Picker // Launches photo picker in multi-select mode. // This means that the user can select multiple photos/videos, up to the limit. // specified by the app in the extra (10 in this example). val maxNum = 10 val intent = Intent(MediaStore.ACTION_PICK_IMAGES) intent.putExtra(MediaStore.EXTRA_PICK_IMAGES_MAX,maxNum) startActivityForResult(intent, PHOTO_PICKER_MULTI_SELECT_RC)

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Handle the Photo Picker results // onActivityResult() handles callbacks from the photo picker. override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent) { when(resultCode) { PHOTO_PICKER_REQUEST_CODE -> { // Get photo picker response for single select. val currentUri: Uri = data.data return } PHOTO_PICKER_MULTI_SELECT_RC -> { // Get photo picker response for multi select. var results = data.clipData return }

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Downgradeable Permissions // Downgrade single permission @RequiresApi(33) fun revokeSelfPermissionOnKill(permName: String): Unit // Downgrade permission group @RequiresApi(33) fun revokeSelfPermissionOnKill(permissions:MutableCollection): Unit

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● Copy and Past UI to Clipboard ● Provides a preview of the copied content ● Sensitive content to clipboard ● Programmable Shaders Other changes

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Text View, Layout, Tools Features and Improvement in Compose

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Downloadable Fonts Font Padding Text Magnifer Text improvements Compose 1.2

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Compose 1.2 Downloadable Fonts @OptIn(ExperimentalTextApi::class) val provider = GoogleFont.Provider( providerAuthority = "com.google.android.gms.fonts", providerPackage = "com.google.android.gms", certificates = R.array.com_google_android_gms_fonts_certs) val fontName = GoogleFont("Lobster Two") val fontFamily = FontFamily(Font(googleFont = GoogleFont(fontName), fontProvider = provider))

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Compose 1.2 Text( text = myText, style = TextStyle( lineHeight = 2.5.em, platformStyle = PlatformTextStyle( includeFontPadding = false ), lineHeightStyle = LineHeightStyle( alignment = Alignment.Center, trim = Trim.None ) ) ) Set includeFontPadding true to left vs right fase and LineHeightSytle

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Text Magnifier able to select text easier Compose 1.2

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Lazy Layouts Nested Scrolling Window insets Shared Element Transitions Layout improvements Compose 1.2

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Lazy Layouts Develop gradually with the grid APIs LazyVerticalGrid and LazyHorizontalGrid Compose 1.2 @Composable fun FavoriteCollectionsGrid( modifier: Modifier = Modifier ) { LazyHorizontalGrid( rows = GridCells.Fixed(2), modifier = modifier ) { items(favoriteCollectionsData) { item -> FavoriteCollectionCard(item.drawable, item.text) } } }

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Nested Scrolling Interop Scrolling composable in Coordinator layout is much smoother Things like Collapsing Toolbar are easy to set up Compose 1.2

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Window insets Graduated from Accompanist to Compose Foundation Compose 1.2

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Shared Element Transitions WIP

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Tools Live Edit Recomposition debugging

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Live Edit Immediately reflected code changes

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Recomposition debugging

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Android 12L & 13, developer resources, Multi-tasking, jetpack collection libraries apps adaptability for all screen sizes

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Material guidelines https://goo.gle/large-screens-guidelines App quality guidelines https://goo.gle/ls-app-quality Compatibility checklist https://goo.gle/ls-checklist Quality matters

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Android 12L & 13 Improved taskbar for app switching Allow Drag and Drop Resizable Window Don’t assume your app will be only used in a certain orientation Don’t assume your app will be only used through a touch screen Multi-window by default Compatibility mode Input support

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a lot of broken assumptions means a lot of code to be changed in your app? Development Changes

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Jetpack WindowManager: stable release, provide common API surface for supporting different device types, starting with foldables and tablet Window Metrics: access currentWindowMetric, maxWindowMetric in advance Window size classes: provide opinionated layout breakpoints for you to know how to adapt your UI based on screen size, partition as compact, medium, expended Activity embedding: allows displaying two Activities simultaneously, with each taking up a portion of the window. SlidingPaneLayout: Places content side by side if the window size allows Resizable and desktop emulators Large Screens made easy

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Thank you! Google Developer Expert (Android) Senior Engineer @ Lomotif @su_myat_tun Su Myat Tun Extended Singapore