Dim icons when recent apps category is disabled

/*

 * Copyright (C) 2013 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.settings.location;

import android.content.Context;

import android.graphics.drawable.Drawable;

import android.preference.Preference;

import android.util.AttributeSet;

/**

 * A preference item that can dim the icon when it's disabled.

 */

public class DimmableIconPreference extends Preference {

    private static final int ICON_ALPHA_ENABLED = 255;

    private static final int ICON_ALPHA_DISABLED = 102;

    public DimmableIconPreference(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

    }

    public DimmableIconPreference(Context context, AttributeSet attrs) {

        super(context, attrs);

    }

    public DimmableIconPreference(Context context) {

        super(context);

    }

    @Override

    public void onParentChanged(Preference parent, boolean disableChild) {

        Drawable icon = getIcon();

        if (icon != null) {

            icon.setAlpha(disableChild ? ICON_ALPHA_DISABLED : ICON_ALPHA_ENABLED);

            setIcon(icon);

        }

        super.onParentChanged(parent, disableChild);

    }

}

            CharSequence label,

            boolean isHighBattery,

            Preference.OnPreferenceClickListener listener) {

        Preference pref = new Preference(mActivity);

        Preference pref = new DimmableIconPreference(mActivity);

        pref.setIcon(icon);

        pref.setTitle(label);

        if (isHighBattery) {