How to Programmatically Enable/Disable Accessibili

问题:

I would like to programmatically enable/disable Accessibility Services listed under Settings->Accessibility option.

I could start Accessibility Intent like below:

Intent intent = new Intent(android.provider.Settings.ACTION_ACCESSIBILITY_SETTINGS);
startActivityForResult(intent, 0);

But I don't have any idea on how to enable the services listed in the view through my code.

Please, provide me your views.

回答1:

I found a solution worked for me by calling

Settings.Secure.putString(getContentResolver(), 
    Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES, "pkgname/classname");
Settings.Secure.putString(getContentResolver(), 
    Settings.Secure.ACCESSIBILITY_ENABLED, "1");

Where the pkgname is your package name and the classname is the class name of your accessibility service.

If you need to enable several services or you don't want to destory the previous settings you might want to use : to seperate other services.

Also you might need to run as a system application and you might need the following permissions

<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />

However, according to @Rupert Rawnsley this might not work on some versions of Android, I am working on Android 4.0.4 and hope it works for you.

PS. If it doesn't work, maybe you could find some luck in /data/data/com.android.providers.settings/databases/settings.db/secure, that's where Android stores secure settings.

回答2:

In Android 7 (API 24), an AccessibilityService can programmatically disable itself by calling the disableSelf() method.

回答3:

AccessibilityService is special and cannot be started programmatically.

回答4:

The best you can do is manualy open the accessibilty settings with:

Intent intent = new Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS)

and start the intent - you can also do it from the prefernece xml file:

intent android:action="android.settings.ACCESSIBILITY_SETTINGS"

回答5:

From Android 6.0 you can use:

adb shell settings put secure enabled_accessibility_services packagname/servicename

The settings.db from old releases is no longer present on Android 6.0.

回答6:

Just in case anybody still seeks to turn off talkback from adb when you are stuck in your lock screen entering the password or pin. One thing you can try is adb shell am force-stop com.google.android.marvin.talkback

回答7:

In instrumented tests I start my accessibility service like this:

private fun enableAccessibilityService() {
    val packageName = "com.example"
    val className = "$packageName.service.MyService"
    val string = "enabled_accessibility_services"
    val cmd = "settings put secure $string $packageName/$className"
    InstrumentationRegistry.getInstrumentation()
      .getUiAutomation(UiAutomation.FLAG_DONT_SUPPRESS_ACCESSIBILITY_SERVICES)
      .executeShellCommand(cmd)
      .close()
    TimeUnit.SECONDS.sleep(3)
}

I tested on Android 6 and 8. This also works for non-system apps.

回答8:

I found this post: How to programmatically check if a service is declared in AndroidManifest.xml?. The top answer talks about PackageManager, which tells you what is running.