Android- using addJavaScriptInterface to return a value from Javascript

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 3  2024

So i know there are other posts addressing the same issue, and I think I\'ve followed them to the letter but alas to no avail. I\'m trying to learn how to get my app to int

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梦谈多话

2020-12-30 15:28

I do it by utilizing the onLoadResource in my Webview class.

Html page:

<html>
<head>
function Submit(){

        var username = $('#username').val();
        var urlNew = 'processing.php';
        urlNew = urlNew + '?' + 'username=' + username;
        $('#submit').attr('href', urlNew);

        return true;
    }
</head>
<body>
    <form>
        <input id="username" name="username" type="text" />
        <a href="" id="submit" onclick="return Submit();" ><img  src="images/button.png" /></a>
     </form>
</body>
</html>

So then in my onLoadResource I listen for that url:

public void onLoadResource(WebView view, String url)
        {
            if(url.contains("http://domain.com/processing.php")){

//process the url and suck out the data

}

This might not be what you need, but there were reasons I had to do it this way so figured it may help you. Also note that I didn't do form submit, I did <a> submit, thats because the onLoadResource won't pick up the form submit.

Edit: This might help.

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無奈伤痛

2020-12-30 15:32
Try enabling javascript on your webview :
```
mWebview.getSettings().setJavaScriptEnabled(true);
```
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旧时难觅i

2020-12-30 15:45
This may not be correct, I will have to double check but it may be due to the reference being lost..

Try making your ClsAccessor reference a member level one..
```
public class JSExample extends Activity {
    ...
    ClsAccessor _accessor = new ClsAccessor();
    ...
    public void onCreate(Bundle savedInstanceState) {
        ...
        mWebView.addJavascriptInterface(_accessor, "accessor");
        ...
```
Also if you debug line by line does setValue() ever get called in managed code?

For what it is worth, I have code that is doing as I have described above and the script to managed interface works fine, however I am not in a position currently to test and see if not having a reference to the class also works.
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