gecko-dev/mobile/android/base/util/HardwareUtils.java

/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.gecko.util;

import android.content.Context;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.os.Build;
import android.util.Log;
import android.view.ViewConfiguration;

public final class HardwareUtils {
    private static final String LOGTAG = "GeckoHardwareUtils";

    private static Context sContext;

    private static Boolean sIsLargeTablet;
    private static Boolean sIsSmallTablet;
    private static Boolean sIsTelevision;
    private static Boolean sHasMenuButton;

    private HardwareUtils() {
    }

    public static void init(Context context) {
        if (sContext != null) {
            Log.w(LOGTAG, "HardwareUtils.init called twice!");
        }
        sContext = context;
    }

    public static boolean isTablet() {
        return isLargeTablet() || isSmallTablet();
    }

    public static boolean isLargeTablet() {
        if (sIsLargeTablet == null) {
            int screenLayout = sContext.getResources().getConfiguration().screenLayout;
            sIsLargeTablet = (Build.VERSION.SDK_INT >= 11 &&
                              ((screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE));
        }
        return sIsLargeTablet;
    }

    public static boolean isSmallTablet() {
        if (sIsSmallTablet == null) {
            int screenLayout = sContext.getResources().getConfiguration().screenLayout;
            sIsSmallTablet = (Build.VERSION.SDK_INT >= 11 &&
                              ((screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE));
        }
        return sIsSmallTablet;
    }

    public static boolean isTelevision() {
        if (sIsTelevision == null) {
            sIsTelevision = sContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TELEVISION);
        }
        return sIsTelevision;
    }

    public static boolean hasMenuButton() {
        if (sHasMenuButton == null) {
            sHasMenuButton = Boolean.TRUE;
            if (Build.VERSION.SDK_INT >= 11) {
                sHasMenuButton = Boolean.FALSE;
            }
            if (Build.VERSION.SDK_INT >= 14) {
                sHasMenuButton = ViewConfiguration.get(sContext).hasPermanentMenuKey();
            }
        }
        return sHasMenuButton;
    }
}