加载JavaScript功能的Android奇巧到的WebView [英] Loading javascript functions to webview in Android Kitkat
问题描述
我有加载JavaScript函数，这是在外部文件，到Android的奇巧的WebView问题。我的早期版本的做法是，我实现了我自己的WebView客户端和方法onPageFinisned我打电话
I am having problems with loading javascript functions, which are in external file, into webview in Android Kitkat. My approach for earlier versions was that i implemented my own webview client and in method onPageFinisned i called
mWebView.loadUrl("javascript:" + functions);
后，当我想叫一些JS的方法，我称之为同一code，像
later, when i wanted to call some js method, i call same code, like
mWebView.loadUrl("javascript:" + someFunction);
在Android的奇巧有新的方法evaluateJavascript，它取代我的code。与调用该JavaScript函数。我的问题是，现在这个老方法抛出这个错误：
In android kitkat there is new method evaluateJavascript, which replaces my code with calling that javascript functions. My problem is that now this and old approach throw this error:
Uncaught ReferenceError: function is not defined
看来，问题出在装载了JavaScript功能的WebView，但我不知道如何加载其他方式。谢谢
It seems that problem is in loading that javascript functions to webview but i dont know how to load it other way. Thanks
推荐答案
什么工作对我来说是有一个网页中的JavaScript函数，在＆LT;脚本＆GT; 标签：
What works for me is to have the JavaScript functions inside a Web page, in <script> tags:
<html>
<head>
<title>Android GeoWebTwo Demo</title>
<script language="javascript">
function whereami(lat, lon) {
document.getElementById("lat").innerHTML=lat;
document.getElementById("lon").innerHTML=lon;
}
function pull() {
var location=JSON.parse(locater.getLocation());
whereami(location.lat, location.lon);
}
</script>
</head>
<body>
<p>
You are at: <br/> <span id="lat">(unknown)</span> latitude and <br/>
<span id="lon">(unknown)</span> longitude.
</p>
<p><a onClick="pull()">Update Location</a></p>
</body>
</html>
随后，我可以成功地使用 evaluateJavascript（）：
public void onLocationChanged(Location location) {
StringBuilder buf=new StringBuilder("whereami(");
buf.append(String.valueOf(location.getLatitude()));
buf.append(",");
buf.append(String.valueOf(location.getLongitude()));
buf.append(")");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
browser.evaluateJavascript(buf.toString(), null);
}
else {
browser.loadUrl("javascript:" + buf.toString());
}
}
（均为code片段是从这个示例应用程序）
这适用于新老版本的Android。现在，在我的情况，我的JavaScript恰好与DOM搞乱，所以我需要一个网页反正。你可能有一个空的＆LT;车身方式＆gt; ，与网页只是为了提供JavaScript函数
This works on old and new versions of Android. Now, in my case, my JavaScript happens to be messing with the DOM, so I needed a Web page anyway. Yours might have an empty <body>, with the Web page just there to supply the JavaScript functions.
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