Android中WebView的默认缩放值是多少?

What is the default scale value of the WebView in Android?

Android doc 表示 getScale() 方法已弃用。
我已经实现了 onScaleChanged(WebView, float, float) 来获取新的比例,但是这个方法只有在比例改变时才会被触发。
那么,webview 的默认比例值是多少?
getScale() 方法来看,它是 2.0f,但是这个值在所有设备上总是 2.0f 吗?

根据开发者 WebView documentation 的说法,缩放比例取决于设备屏幕上的像素密度:

By default, WebView scales a web page so that it is drawn at a size that matches the default appearance on a medium density screen. So, it applies 1.5x scaling on a high density screen (because its pixels are smaller) and 0.75x scaling on a low density screen (because its pixels are bigger). Starting with API level ECLAIR, WebView supports DOM, CSS, and meta tag features to help you (as a web developer) target screens with different screen densities.

更多信息可在页面 Supporting Different Screens in Web Apps 上找到,其中包含使用 JavaScript:

查询设备密度的信息(和示例代码)
if (window.devicePixelRatio == 1.5) {
  alert("This is a high-density screen");
} else if (window.devicePixelRatio == 0.75) {
  alert("This is a low-density screen");
}