Vol dialog uses A11yServicesStateChangeListener

import android.view.Window;

import android.view.WindowManager;

import android.view.accessibility.AccessibilityEvent;

import android.view.accessibility.AccessibilityManager.AccessibilityStateChangeListener;

import android.view.accessibility.AccessibilityManager.AccessibilityServicesStateChangeListener;

import android.view.animation.DecelerateInterpolator;

import android.widget.ImageButton;

import android.widget.ImageView;

                }

            });

            mDialogView.setAccessibilityDelegate(this);

            mAccessibilityMgr.addAccessibilityStateChangeListener(mListener);

            mAccessibilityMgr.addCallback(mListener);

            updateFeedbackEnabled();

        }

        public void destroy() {

            mAccessibilityMgr.removeAccessibilityStateChangeListener(mListener);

            mAccessibilityMgr.removeCallback(mListener);

        }

        @Override

            return false;

        }

        private final AccessibilityStateChangeListener mListener =

        private final AccessibilityServicesStateChangeListener mListener =

                enabled -> updateFeedbackEnabled();

    }