113 lines
3.9 KiB
Java
113 lines
3.9 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.gecko.util;
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import org.mozilla.gecko.SysInfo;
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import android.content.Context;
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import android.content.pm.PackageManager;
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import android.content.res.Configuration;
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import android.os.Build;
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import android.util.Log;
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import android.view.ViewConfiguration;
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public final class HardwareUtils {
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private static final String LOGTAG = "GeckoHardwareUtils";
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// Minimum memory threshold for a device to be considered
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// a low memory platform (see isLowMemoryPlatform). This value
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// has be in sync with Gecko's equivalent threshold (defined in
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// xpcom/base/nsMemoryImpl.cpp) and should only be used in cases
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// where we can't depend on Gecko to be up and running e.g. show/hide
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// reading list capabilities in HomePager.
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private static final int LOW_MEMORY_THRESHOLD_MB = 384;
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private static final boolean IS_AMAZON_DEVICE = Build.MANUFACTURER.equalsIgnoreCase("Amazon");
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public static final boolean IS_KINDLE_DEVICE = IS_AMAZON_DEVICE &&
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(Build.MODEL.equals("Kindle Fire") ||
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Build.MODEL.startsWith("KF"));
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private static volatile boolean sInited;
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// These are all set once, during init.
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private static volatile boolean sIsLargeTablet;
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private static volatile boolean sIsSmallTablet;
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private static volatile boolean sIsTelevision;
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private static volatile boolean sHasMenuButton;
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private HardwareUtils() {
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}
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public static void init(Context context) {
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if (sInited) {
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// This is unavoidable, given that HardwareUtils is called from background services.
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Log.d(LOGTAG, "HardwareUtils already inited.");
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return;
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}
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// Pre-populate common flags from the context.
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final int screenLayoutSize = context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK;
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if (Build.VERSION.SDK_INT >= 11) {
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sHasMenuButton = false;
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if (screenLayoutSize == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
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sIsLargeTablet = true;
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} else if (screenLayoutSize == Configuration.SCREENLAYOUT_SIZE_LARGE) {
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sIsSmallTablet = true;
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}
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if (Build.VERSION.SDK_INT >= 14) {
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sHasMenuButton = ViewConfiguration.get(context).hasPermanentMenuKey();
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if (Build.VERSION.SDK_INT >= 16) {
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if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TELEVISION)) {
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sIsTelevision = true;
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}
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}
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}
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} else {
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sHasMenuButton = true;
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}
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sInited = true;
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}
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public static boolean isTablet() {
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return sIsLargeTablet || sIsSmallTablet;
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}
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public static boolean isLargeTablet() {
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return sIsLargeTablet;
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}
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public static boolean isSmallTablet() {
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return sIsSmallTablet;
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}
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public static boolean isTelevision() {
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return sIsTelevision;
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}
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public static boolean hasMenuButton() {
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return sHasMenuButton;
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}
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public static int getMemSize() {
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return SysInfo.getMemSize();
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}
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public static boolean isLowMemoryPlatform() {
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final int memSize = getMemSize();
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// Fallback to false if we fail to read meminfo
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// for some reason.
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if (memSize == 0) {
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Log.w(LOGTAG, "Could not compute system memory. Falling back to isLowMemoryPlatform = false.");
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return false;
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}
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return memSize < LOW_MEMORY_THRESHOLD_MB;
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}
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}
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