Perform scroll actions without actually scrolling.Adjust the volume without touching the volume buttons on the side of the phone.Power off the device without reaching the actual power button on the side of the phone.The user can touch buttons on this bar to perform the following actions: Your service will overlay a global action bar on the screen. The user has difficulty scrolling or swiping.The user has difficulty reaching the side buttons on a device.You'll build a service for a hypothetical user with the following characteristics: Since this is a sample, the UI is deliberately kept quite basic. The focus in this codelab is to show you how to write a functional accessibility service. The accessibility API is powerful: the code for the service you'll be building is contained in only four files, and uses ~200 lines of code! If you can write a basic Android app, you can develop a similar service. In this codelab, you'll develop a simple service that does a few useful things using the accessibility API. If there is someone you know who has trouble using their device, YOU can develop an accessibility service for that user! What you'll be building Since many users with disabilities have unique needs, Android's APIs for creating accessibility services are open, and developers are free to create accessibility services and distribute them through the Play Store. While Google provides services like Switch Access, Voice Access, and Talkback for Android users, these services cannot possibly serve all users with disabilities. Talkback: a screen reader commonly used by visually impaired or blind users.Voice Access (beta): allows Android users with mobility limitations to control a device with spoken commands.Switch Access: allows Android users with mobility limitations to interact with devices using one or more switches.Examples of common accessibility services It is a long-running privileged service that helps users process information on the screen and lets them to interact meaningfully with a device. What is an Accessibility Service?Īn Accessibility Service assists users with disabilities in using Android devices and apps. This codelab shows you how to create a very simple accessibility service. An accessibility service can communicate to the user on the application's behalf, for example by converting text to speech or providing haptic feedback when a user is hovering on an important area of the screen. Instead of LayoutParams.TYPE_TOAST or TYPE_APPLICATION_PANEL or SYSTEM_ALERT.Accessibility services are a feature of the Android framework designed to provide alternative navigation feedback to the user on behalf of applications installed on Android devices. "For Android API level of 8.0.0, you should use So it only shows up on GL g6 with android 8.1.1. W/System.err: at .ZygoteInit.main(ZygoteInit.java:770) W/System.err: at .Zygote$n(Zygote.java:240) W/System.err: at (ActivityThread.java:6710) W/System.err: at android.os.Looper.loop(Looper.java:164) W/System.err: at android.os.Handler.dispatchMessage(Handler.java:105) W/System.err: at $H.handleMessage(ActivityThread.java:1717) W/System.err: at .-wrap20(Unknown Source:0) W/System.err: at (ActivityThread.java:3609) W/System.err: at .CaptureImageService.onStartCommand(CaptureImageService.java:98) W/System.err: at (HiddenCameraService.java:82) W/System.err: at (HiddenCameraService.java:125) W/System.err: at (WindowManagerImpl.java:93) W/System.err: at (WindowManagerGlobal.java:368) W/System.err: $BadTokenException: Unable to add window - permission denied for window type 2006
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