How to retrieve data from an open HTML form in a WebView?

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How to retrieve data from an open HTML form in a WebView?

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#1 by (2 votes)

1

Hello! I have a responsive web application that I intend to open via android application through a WebView. Well, the only problem is that I would need to grab some data from the submit from only one application form to send to a bluetooth printer (whose code is java based). Is there a way to get this data that comes from the web application and pass it to my java application? The simpler the better. Thanks in advance.

php mysql java android html

asked by anonymous 15.09.2016 / 18:13

1 answer

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score 2 · Answer 1

You need to add an interface, at the time the webView declares.

Example:

WebView webView = (WebView) findViewById(R.id.webview);
webView.addJavascriptInterface(new WebAppInterface(this), "Android");

WebAppInterface class code:

public class WebAppInterface {
    Context mContext;

    /** Instantiate the interface and set the context */
    WebAppInterface(Context c) {
        mContext = c;
    }

    /** Show a toast from the web page */
    @JavascriptInterface
    public void showToast(String toast) {
        Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
    }
}

Now in your PHP, you should include the onClick in your input.

Example:

<input type="button" value="Say hello" onClick="showAndroidToast('Hello Android!')" />

And the JavaScript that will be responsible for "chatting" with Android:

Example:

<script type="text/javascript">
    function showAndroidToast(toast) {
        Android.showToast(toast);
    }
</script>

You can see more examples and details on the Android documentation