Shows navbar in SUW if the a11y button is requested

/*

 * Copyright (C) 2017 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.android.settingslib.accessibility;

import android.accessibilityservice.AccessibilityServiceInfo;

import android.content.Context;

import android.content.res.Resources;

import android.provider.Settings;

import android.view.accessibility.AccessibilityManager;

import java.util.List;

/**

 * A helper class to assist determining the state of the accessibility button that can appear

 * within the software-rendered navigation area.

 */

public class AccessibilityButtonHelper {

    public static boolean isRequestedByMagnification(Context ctx) {

        return Settings.Secure.getInt(ctx.getContentResolver(),

                Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED, 0) == 1;

    }

    public static boolean isRequestedByAccessibilityService(Context ctx) {

        final AccessibilityManager accessibilityManager = ctx.getSystemService(

                AccessibilityManager.class);

        List<AccessibilityServiceInfo> services =

                accessibilityManager.getEnabledAccessibilityServiceList(

                        AccessibilityServiceInfo.FEEDBACK_ALL_MASK);

        if (services != null) {

            for (int i = 0, size = services.size(); i < size; i++) {

                if ((services.get(i).flags

                        & AccessibilityServiceInfo.FLAG_REQUEST_ACCESSIBILITY_BUTTON)

                        != 0) {

                    return true;

                }

            }

        }

        return false;

    }

    public static boolean isRequested(Context ctx) {

        return isRequestedByMagnification(ctx) || isRequestedByAccessibilityService(ctx);

    }

    public static boolean isDeviceSupported(Resources res) {

        return res.getBoolean(com.android.internal.R.bool.config_showNavigationBar);

    }

}