Android数据保护程序(Data Saver)可确保您充分利用数据计划。大多数应用程序在后台运行，消耗宝贵的数据以使您保持最新状态。使用Android(Android)上的内置数据保护程序(Data Saver)，您可以决定哪些应用程序可以不受限制地访问移动数据，哪些应用程序不能在后台发送和接收数据。继续阅读以了解有关Android 数据保护程序(Android Data Saver)以及如何在智能手机上启用它的更多信息：
注意：(NOTE:)本指南适用于Android 10，它是在诺基亚 5.3(Nokia 5.3)智能手机上创建的。如果您不知道自己的Android版本，请阅读如何在智能手机或平板电脑上查看 Android 版本(How to check the Android version on your smartphone or tablet)。所有 Android 设备上的过程都相似，但您可能会遇到一些小的差异，具体取决于您的设备制造商。
什么是 Android 数据保护程序？
流量节省程序是(Data Saver)Android内置的一项功能，可帮助您在后台控制应用程序的移动数据消耗。数据保护(Data Saver)模式仅在您未使用Wi-Fi时才处于活动状态，它确保不活动的应用程序和服务不会在后台使用蜂窝数据。如果您的套餐数据有限，可以通过多种方式使用Android的原生应用和功能来避免额外费用。
首先，检查和限制您的移动数据使用量(check and limit your mobile data usage)是个好主意。然后，您可以限制某些应用程序的互联网访问(restrict internet access for certain apps)。但是，您不能忽视启用数据保护程序(Data Saver)然后将您认为必不可少的应用程序列入白名单是多么容易。受限制的应用程序不再在后台消耗蜂窝数据；他们只在您访问它们时使用移动数据。即使处于活动状态，它们也会被引导消耗更少的数据。不利的一面是，这意味着您不会从受限制的应用程序中获得任何更新。
例如，如果受到Android 数据保护程序(Data Saver)的限制，Gmail应用程序将不再让您知道您何时收到新电子邮件，因为该应用程序不再在后台同步。但是，如果您访问该应用程序，它就会开始使用移动数据来同步和显示新邮件。对于所有显示在线内容通知的应用程序都是如此。
如果应用程序在不受限制的数据(Unrestricted data)列表（列入白名单）中，它会正常运行并忽略数据保护程序(Data Saver)模式。
如何通过设置(Settings)在Android上启用(Android)数据保护程序(Data Saver)
要打开流量节省程序(Data Saver)，请转到 Android 设置(go to Android Settings)并打开网络和互联网(Network & internet)。在某些智能手机（例如华为(Huawei)的智能手机）上，改为点击移动网络。(Mobile network)
在网络和互联网(Network & internet)屏幕上，点击数据使用(Data usage)。
在下一个屏幕上，您可以找到Data Saver设置，其当前状态显示在下方 - 在我们的示例中为Off。点击它。
您可以看到Data Saver(Data Saver)屏幕顶部的开关已关闭(Off)。点击使用数据保护程序(Use Data Saver)选项以启用数据保护程序(Data Saver)模式。
点击该选项可启用数据保护(Data Saver)模式并打开开关(On)。
返回，您可以看到此更改也反映在Data usage屏幕上：Data Saver 的(Data Saver's)状态现在为On。
如何从快速设置启用(Quick Settings)Android 数据保护程序(Android Data Saver)
如果您想随时掌握数据使用情况，您可能需要一种更快的方式来激活Android 智能手机上的数据保护程序。(Data Saver)
幸运的是，在某些设备上，您可以使用“快速设置”按钮。(Quick Settings)要访问快速设置(Quick Settings)，请从屏幕顶部向下滑动。
再次向下滑动以打开快速设置(Quick Settings)菜单，您可以在其中更改 Android 上可用的快速设置(change the quick settings available on your Android)并添加数据保护程序(Data Saver)图标 - 如果它尚不可用。
流量节省程序(Data Saver)图标看起来像一个中断的圆圈。在快速设置(Quick Settings)中，点击数据保护程序(Data Saver)以启用该选项。
该图标会更改颜色并在中间显示一个加号，以表明已启用流量节省程序(Data Saver)模式。
您可以在屏幕顶部看到一个类似的图标，确保您记住数据保护程序(Data Saver)处于活动状态并停止大多数应用程序和服务的后台活动。
如何将应用程序列入白名单以在流量节省程序(Data Saver)模式下使用不受限制的数据
Android数据保护程序(Data Saver)的优点在于，您可以免除任何您认为优先考虑的应用程序的后台蜂窝数据限制。如果您期待收到一封重要的电子邮件，或者只是想看看谁在您最喜欢的社交媒体频道上提到了您，您可以将重要的应用程序添加到不受限制的数据(Unrestricted data)列表中。将应用列入白名单允许它在流量节省程序(Data Saver)开启时继续在后台使用移动数据。
要将应用程序列入白名单并将它们添加到不受限制的数据(Unrestricted data)列表中，请访问网络和互联网(Network & internet)设置，转到数据使用情况(Data usage)，然后点击数据保护程序(Data Saver)- 如本教程的第二部分所示。
或者，如果您启用了Data Saver快速设置，您也可以长按它以进入Data Saver屏幕。到达那里后，点击Unrestricted data。
默认情况下，在我们的 Android 设备上，运营商服务(Carrier Services)和Google Play 服务(Google Play services)是唯一允许在流量节省程序(Data Saver)开启时使用不受限制的数据的应用程序。在不受限制的数据(Unrestricted data)屏幕上，点击任何应用程序以打开其开关并让它在后台运行。
使用右上角的三点图标还可以在不受限制的数据(Unrestricted data)列表上显示系统(Show system)应用程序。您也可以选择它们用于不受限制的后台数据使用。
请记住，允许太多应用程序和服务在后台使用移动数据会破坏数据保护程序(Data Saver)的目的。
如何在Android上关闭数据保护程序(Data Saver)
要关闭流量节省程序(Data Saver)，请访问设置(Settings)。在某些设备上，您可能会看到顶部带有流量节省程序图标的条目。(Data Saver)点击它。
该条目会展开，让您知道数据保护程序(Data Saver)已打开，因此后台数据只能通过Wi-Fi获得。点击(Tap)关闭(Turn off)以禁用数据保护程序(Data Saver)，该条目将消失。
如果您没有获得该条目，则可以从Settings访问Network & internet，然后访问Data usage，然后点击Data Saver - 如本教程的第二部分所示。点击使用数据保护程序(Use Data Saver)以关闭开关并禁用该功能。
如果您能够将数据保护程序(Data Saver)添加到快速设置(Quick Settings)，您还可以向下滑动并点击其图标以禁用它。
您在流量节省程序(Data Saver)模式下将哪些应用程序列入白名单？
除非您拥有无限数据计划，否则Android 数据保护程序(Data Saver)对于优化您设备的移动数据使用是必不可少的。为了物有所值，请使用它并通过在后台同步来选择允许哪些应用程序使用蜂窝数据。我们将Gmail添加到Android智能手机上的(Android)无限制数据(Unrestricted data)列表中，因为我们的工作电子邮件是优先考虑的。那你呢？您优先考虑哪些应用程序，为什么？请在下面的评论中告诉我们。
The Android Data Saver and how to enable it
The Andrоid Data Saver ensures that you make the most of your data plan. Most apps run in the background, consuming precious data in an effort to keep you up to date. With the built-in Data Saver on Android, you can decide which apps get unrestricted mobile data access and which are prevented from sending and receiving data in the background. Continue reading to find out more about the Android Data Saver and how to enable it on your smartphone:
NOTE: This guide applies to Android 10, and it was created on a Nokia 5.3 smartphone. If you do not know your Android version, read How to check the Android version on your smartphone or tablet. The procedures are similar on all Android-powered devices, although you might come across some small differences, depending on your device's manufacturer.
What is the Android Data Saver?
The Data Saver is a feature built into Android, that helps you control the mobile data consumption of apps in the background. The Data Saver mode is only active when you are not on Wi-Fi, and it ensures that inactive apps and services are not using cellular data in the background. If your plan has limited data, there are several ways to use Android's native apps and features to avoid additional charges.
First, it's a good idea to check and limit your mobile data usage. Then, you can restrict internet access for certain apps. However, you can't ignore how much easier it is to enable the Data Saver and then whitelist the apps you find essential. Restricted apps no longer consume cellular data in the background; they only use mobile data when you access them. Even when active, they are directed to consume less data. On the downside, this means you don't get any updates from restricted apps.
For instance, if restricted by the Android Data Saver, the Gmail app no longer lets you know when you receive new emails, as the app no longer syncs in the background. If you access the app, however, it starts using mobile data to sync and display new mails. This is true for all the apps that display notifications about online content.
If an app is on the Unrestricted data list (whitelisted), it behaves normally and ignores the Data Saver mode.
How to enable Data Saver on Android from Settings
To turn on the Data Saver, go to Android Settings and open Network & internet. On some smartphones, like those from Huawei, tap Mobile network instead.
On the Network & internet screen, tap on Data usage.
On the next screen, you can find the Data Saver setting with its current status shown underneath - in our case, Off. Tap on it.
You can see the switch at the top of the Data Saver screen is Off. Tap on the Use Data Saver option to enable Data Saver mode.
Tapping on the option enables Data Saver mode and turns the switch On.
Go back, and you can see that this change is also reflected on the Data usage screen: the Data Saver's status is now On.
How to enable the Android Data Saver from the Quick Settings
If you like to stay on top of your data usage, you might want a faster way to activate the Data Saver on your Android smartphone.
Luckily, on some devices, there is a Quick Settings button you can use for that. To access Quick Settings, swipe down from the top side of your screen.
Swipe down again for the expanded Quick Settings menu, where you can change the quick settings available on your Android and add the Data Saver icon - if it's not already available.
The Data Saver icon looks like an interrupted circle. In the Quick Settings, tap on Data Saver to enable the option.
The icon changes colors and displays a plus sign in the middle to show that Data Saver mode is enabled.
You can see a similar icon displayed at the top of your screen, making sure you remember that Data Saver is active and stopping background activities for most apps and services.
How to whitelist apps to use unrestricted data in Data Saver mode
The great thing about the Android Data Saver is that you can exempt any apps you consider a priority from having their background cellular data restricted. If you are expecting an important email or simply have to see who mentions you on your favorite social media channel, you can add the vital app to the Unrestricted data list. Whitelisting an app allows it to continue using mobile data in the background while Data Saver is on.
To whitelist apps and add them to the Unrestricted data list, access Network & internet settings, go to Data usage, and tap on Data Saver - as illustrated in the second section of this tutorial.
Alternatively, if you enabled the Data Saver quick setting, you can also touch-and-hold on it to get to the Data Saver screen. Once there, tap on Unrestricted data.
On our Android device, the Carrier Services and Google Play services are, by default, the only apps allowed to use unrestricted data when Data Saver is on. On the Unrestricted data screen, tap on any app to toggle on its switch and let it run in the background.
Use the three-dot icon in the upper-right corner to also Show system apps on the Unrestricted data list. You can select them for unrestricted background data use too.
Keep in mind that allowing too many apps and services to use mobile data in the background defeats the purpose of the Data Saver.
How to turn off Data Saver on Android
To turn off Data Saver, access Settings. On some devices, you might get an entry with the Data Saver icon on top. Tap on it.
The entry expands, letting you know Data Saver is on, so background data is only available via Wi-Fi. Tap on Turn off to disable Data Saver, and the entry disappears.
If you don't get that entry, from Settings, you can access Network & internet, then Data usage, and tap on Data Saver - as shown in the second section of this tutorial. Tap on Use Data Saver to turn off the switch and disable the feature.
If you are able to add the Data Saver to Quick Settings, you can also swipe down and tap on its icon to disable it.
What apps did you whitelist in Data Saver mode?
Unless you have an unlimited data plan, the Android Data Saver is indispensable to optimizing your device's mobile data usage. To get better value for your money, use it and choose which apps are allowed to consume cellular data by syncing in the background. We added Gmail to the Unrestricted data list on our Android smartphone because our work emails are a priority. What about you? Which apps did you prioritize and why? Let us know in the comments below.
