Only announce for accessibility if accessibility is enabled

import android.view.ViewGroup;

import android.view.WindowManager;

import android.view.accessibility.AccessibilityEvent;

import android.view.accessibility.AccessibilityManager;

import android.view.animation.Interpolator;

import android.widget.Button;

import android.widget.ImageView;

    protected static final int STATE_PENDING_CONFIRMATION = 3;

    protected static final int STATE_AUTHENTICATED = 4;

    private final AccessibilityManager mAccessibilityManager;

    private final IBinder mWindowToken = new Binder();

    private final Interpolator mLinearOutSlowIn;

    private final WindowManager mWindowManager;

        super(context);

        mCallback = callback;

        mLinearOutSlowIn = Interpolators.LINEAR_OUT_SLOW_IN;

        mAccessibilityManager = mContext.getSystemService(AccessibilityManager.class);

        mWindowManager = mContext.getSystemService(WindowManager.class);

        mUserManager = mContext.getSystemService(UserManager.class);

        mDevicePolicyManager = mContext.getSystemService(DevicePolicyManager.class);

    // Every time a view becomes invisible we need to announce an accessibility event.

    // This is due to an issue in the framework, b/132298701 recommended this workaround.

    protected void announceAccessibilityEvent() {

        if (!mAccessibilityManager.isEnabled()) {

            return;

        }

        AccessibilityEvent event = AccessibilityEvent.obtain();

        event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);

        event.setContentChangeTypes(CONTENT_CHANGE_TYPE_SUBTREE);

        mDialog.sendAccessibilityEventUnchecked(event);

        mDialog.notifySubtreeAccessibilityStateChanged(mDialog, mDialog,

                CONTENT_CHANGE_TYPE_SUBTREE);

        event.recycle();

    }

}