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[英]How can I return a value of a JavaScript function, which is called by a HTML button click?
[英]How can I get the return value of a JavaScript function called by Android?
Android是否可以調用JavaScript函數(位於WebView中)並在Java中獲取其返回值?
我知道我可以使用JavascriptInterface(在Android中),為此,我需要從js函數調用該接口,但是我無法修改JavaScript函數...
所以我想要下面這樣的東西,有可能嗎?
JavaScript:
function hello(){
return "world";
}
Android:
String res = myWebView.loadUrl("javascript:hello()");
// res = "world"
謝謝
對的,這是可能的。 我之前已經在人們網站上做了很多JavaScript注入。 您只需要在任何網站中注入自己的JavaScript。
例如
//simple javascript to pass value from javascript to native app
String javascript = "javascript:function testHello(){return Android.hello('HAI'); testHello();}"
webview.setWebViewClient(new WebViewClient() {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
//put your function in string and load the javascript when the page is finished load
view.loadUrl(javascript);
}
});
// 'Android' is your variable key for triggering the function ex: Android.hello(), Android.calculate()
// you can change to other name like 'APP', so in javascript be like this ex: APP.hello(), APP.calculate()
webview.addJavascriptInterface(new WebAppInterface(this), "Android");
//load website
webview.loadUrl(PageUrl);
在WebAppInterface中,您可以在其中創建函數來檢測之前注入的javascript
public class WebAppInterface {
Activity mContext;
public WebAppInterface(Activity c) {
mContext = c;
}
//this function will get your value from the javascript earlier.
//Android.hello('value')
@JavascriptInterface
public void hello(String value){
//you will get HAI message in here
Log.i("TAG",value);
}
}
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