/**
* Registers an AccessibilityStateChangeListener that show a Toast
* when the global accessibility state on the device changes.
*/
private void RegisterAccessibilityStateChangeListener()
{
// The AccessibilityStateChange listener APIs were Added in ICS. Therefore to be
// backwards compatible we use the APIs in the support library. Note that if the
// platform API version is lower and the called API is not available no listener
// is Added and you will not receive a call of onAccessibilityStateChanged.
AccessibilityManagerCompat.AddAccessibilityStateChangeListener(mAccessibilityManager,
new MyAccessibilityStateChangeListenerCompat(this));
}
/**
* Updates the content of a TextView with description of the enabled
* accessibility services.
*/
private void UpdateAccessibilityStateView()
{
// The API for getting the enabled accessibility services based on feedback
// type was Added in ICS. Therefore to be backwards compatible we use the
// APIs in the support library. Note that if the platform API version is lower
// and the called API is not available an empty list of services is returned.
IList <AccessibilityServiceInfo> enabledServices =
AccessibilityManagerCompat.GetEnabledAccessibilityServiceList(mAccessibilityManager,
AccessibilityServiceInfo.FEEDBACK_SPOKEN);
if (!enabledServices.IsEmpty())
{
StringBuilder builder = new StringBuilder();
int enabledServiceCount = enabledServices.Size();
for (int i = 0; i < enabledServiceCount; i++)
{
AccessibilityServiceInfo service = enabledServices.Get(i);
// Some new APIs were Added in ICS for getting more information about
// an accessibility service. Again accessed them via the support library.
ResolveInfo resolveInfo = AccessibilityServiceInfoCompat.GetResolveInfo(service);
string serviceDescription = GetString(
R.String.accessibility_manager_enabled_service,
resolveInfo.LoadLabel(GetPackageManager()),
AccessibilityServiceInfoCompat.FeedbackTypeToString(service.FeedbackType),
AccessibilityServiceInfoCompat.GetDescription(service),
AccessibilityServiceInfoCompat.GetSettingsActivityName(service));
builder.Append(serviceDescription);
}
mAccessibilityStateView.Text = (builder);
}
else
{
// Either no services or the platform API version is not high enough.
mAccessibilityStateView.Text = (GetString(
R.String.accessibility_manager_no_enabled_services));
}
}
