保持缩放级别中的WebView [英] Keep zoom level in a WebView

问题描述

可能重复：
  <一href="http://stackoverflow.com/questions/2959833/webview-how-to-$p$pserve-the-users-zoom-settings-across-sessions">WebView:如何preserve用户的变焦设置在会话？

我正在开发一个简单的Andr​​oid应用程序，它加载初始URL我的WebView里面，那么用户可以自由地放大/缩小和浏览。

I'm developing a simple android app, which loads an initial URL inside my WebView, then the user is free to zoom in/out and navigate.

当用户点击链接时，缩放级别丢失（或重置）并且用户必须放大/缩小再次！这是令人沮丧的用户！我怎么也找不到保存/ preserve当前的缩放。 （我用onScaleChanged事件试过，但现在看来，这是产生用户点击后，才）

When the user taps on a link, the "zoom level" is lost (or reset) and the user has to zoom in/out again! This is frustrating users! I couldn't find how to save/preserve the current zoom. (I've tried using the onScaleChanged event, but it seems it is generated only after the user tapped)

我已经使用，里面onPageFinished解决：

I've solved using, inside onPageFinished:

@Override
public void onPageFinished(WebView webView, String url) {
webView.loadUrl("javascript:(function() { " +  
"document.getElementsByTagName('body')[0].style.zoom='" + yourzoomvariable + "'; })()");
}

非常感谢您的帮助！

Thank you very much for the help!

推荐答案

你有权力，你是显示的HTML？你可以调整缩放比例，也放大了HTML里面的头中的meta标签：

Do you have power over the html you are showing? you could adjust the scaling and zooming also inside the html with a meta tag inside the header:

例如：

<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=0.5,  maximum-scale=2.0">

编辑：

您也可以在每次加载完成后如下图所示$ C $下改变背景颜色渐变注入的元标记。

You could also inject that metatag on every load finished like below code for changing the background color to a gradient.

public void onPageFinished(WebView view, String url) {



            //styling



            webview.loadUrl("javascript:(function() { " +  
                    "document.getElementsByTagName('body')[0].style.background = '-webkit-gradient(linear, 0% 0%, 0% 100%, from(#143b8a), to(#266af3))'; " + 
                    "})()");  



        }

你也可以请使用放大和zoomout值喜欢这里的<一个解释href="http://stackoverflow.com/questions/5741492/how-to-zoom-in-out-the-content-of-a-webview-programmatically">How放大一个web视图的输入/输出编程的内容吗？的然后，你可以保存有状态，用户将不得不调整它唯一的。

Also you could use the zoomin and zoomout values like explained here How to zoom in/out the content of a WebView programmatically? Then you could save there status and the user would have to adjust it only ones.

这篇关于保持缩放级别中的WebView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！