检测 HiDPI Windows Phone 8 设备 [英] Detecting HiDPI Windows Phone 8 Devices

问题描述

如何检测运行 Windows Phone 8 的 HiDPI 设备?

我正在测试的手机是诺基亚 Lumia 920，它具有 4.5 英寸 1280 × 768 屏幕(即 > 300 dpi).IE 在 CSS 中支持 min-resolution 但不支持 min-device-pixel-ratio.使用此设备像素密度测试，Lumia 报告 96 dpi.这远低于实际屏幕分辨率，会被视为普通的非 HiDPI 设备.

由于 IE(尚)不支持 JavaScript 中的 window.devicePixelRatio，我无法找到一种方法来准确检测 Lumia 是否能够显示 HiDPI 图像.

解决方案

查看 http://timkadlec.com/2013/01/windows-phone-8-and-device-width/

理论上(我没有手机可以对此进行测试)如果您将以下所有内容添加到您的页面，您应该能够获得适用于 Windows Phone 8 和 Windows 8 设备的有效 DPR.

HTML 元视口(当前/旧版非 W3C 实现)

CSS @viewport(当前/未来的 W3C 草案实现):

@-webkit-viewport{width:device-width}@-moz-viewport{width:device-width}@-ms-viewport{width:device-width}@-o-viewport{width:device-width}@viewport{width:device-width}

Javascript 在 Windows Phone 8 中禁用元视口的古怪 @viewport 覆盖:

if (navigator.userAgent.match(/IEMobile/10.0/)) {var msViewportStyle = document.createElement("style");msViewportStyle.appendChild(document.createTextNode(@-ms-viewport{width:auto!important}"));document.getElementsByTagName("head")[0].appendChild(msViewportStyle);}

那么 screen.width/document.documentElement.clientWidth 应该是 所有正确实现 screen.width 的移动浏览器

How do I detect HiDPI devices running Windows Phone 8?

The phone I'm testing is the Nokia Lumia 920, which has a 4.5-inch 1280 × 768 screen (i.e. > 300 dpi). IE supports min-resolution in CSS but not min-device-pixel-ratio. Using this device pixel density test, the Lumia reports 96 dpi. This is far lower than the actual screen resolution, and would be considered a regular non-HiDPI device.

Since IE doesn't (yet) support window.devicePixelRatio in JavaScript, I can't find a way to accurately detect the Lumia as capable of displaying HiDPI images.

解决方案

Check out http://timkadlec.com/2013/01/windows-phone-8-and-device-width/

Theoretically (I don't have a phone to test this on) if you add all of the following to your page you should be granted the ability to get a valid DPR for both Windows Phone 8 and Windows 8 devices.

HTML meta viewport (current/legacy non-W3C implementations)

<meta name="viewport" content="width=device-width" /> 

CSS @viewport (current/future W3C draft implementations) :

@-webkit-viewport{width:device-width}
@-moz-viewport{width:device-width}
@-ms-viewport{width:device-width}
@-o-viewport{width:device-width}
@viewport{width:device-width}

Javascript to disable the quirky @viewport override of meta viewport in Windows Phone 8 :

if (navigator.userAgent.match(/IEMobile/10.0/)) {
    var msViewportStyle = document.createElement("style");
    msViewportStyle.appendChild(
        document.createTextNode(
            "@-ms-viewport{width:auto!important}"
        )
    );
    document.getElementsByTagName("head")[0].
        appendChild(msViewportStyle);
}

Then screen.width/document.documentElement.clientWidth should be a valid approximation of window.devicePixelRatio for all mobile browsers that correctly implement screen.width

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