utils: Introduce ScreenType class

/*

 * Copyright (C) 2015 The CyanogenMod 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.internal.util.cm;

import android.content.Context;

import android.util.DisplayMetrics;

import android.view.DisplayInfo;

import android.view.WindowManager;

public class ScreenType {

    // Device type reference

    private static int sDeviceType = -1;

    // Device types

    private static final int DEVICE_PHONE = 0;

    private static final int DEVICE_HYBRID = 1;

    private static final int DEVICE_TABLET = 2;

    private static int getScreenType(Context context) {

        if (sDeviceType == -1) {

            WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);

            DisplayInfo outDisplayInfo = new DisplayInfo();

            wm.getDefaultDisplay().getDisplayInfo(outDisplayInfo);

            int shortSize = Math.min(outDisplayInfo.logicalHeight, outDisplayInfo.logicalWidth);

            int shortSizeDp = shortSize * DisplayMetrics.DENSITY_DEFAULT

                    / outDisplayInfo.logicalDensityDpi;

            if (shortSizeDp < 600) {

                // 0-599dp: "phone" UI with a separate status & navigation bar

                sDeviceType =  DEVICE_PHONE;

            } else if (shortSizeDp < 720) {

                // 600-719dp: "phone" UI with modifications for larger screens

                sDeviceType = DEVICE_HYBRID;

            } else {

                // 720dp: "tablet" UI with a single combined status & navigation bar

                sDeviceType = DEVICE_TABLET;

            }

        }

        return sDeviceType;

    }

    public static boolean isPhone(Context context) {

        return getScreenType(context) == DEVICE_PHONE;

    }

    public static boolean isHybrid(Context context) {

        return getScreenType(context) == DEVICE_HYBRID;

    }

    public static boolean isTablet(Context context) {

        return getScreenType(context) == DEVICE_TABLET;

    }

}