Android How to call method on Activity from JavascriptInterface

Question

I have a webview which has HTML with a link calling Android.closeRegForm() in WebAppInterface i have a method

@JavascriptInterface
    public void closeRegForm() {
        ((MainActivity)mContext).closeRegForm();
    }

which must call method closeRegForm on MainActivity, but I am getting this error.

09-10 12:54:50.134: E/Web Console(1171): Uncaught Error: Error calling method on NPObject. at http://example.com/aaa.php:1

when I change this method to

@JavascriptInterface
    public void closeRegForm() {
        Toast.makeText(mContext, "blabla", Toast.LENGTH_SHORT).show();
    }

it shows "blabla" toast. Why I cannot call method on mainactivity?

"Uncaught Error" suggests there's an exception of some sort. Surround with try/catch and log it. — laalto
– laalto, Commented Sep 10, 2013 at 13:06
thanks, I got this error, 09-10 13:11:03.526: D/qwe(1242): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. I know what to do whit it. — Nadir Novruzov
– Nadir Novruzov, Commented Sep 10, 2013 at 13:11

IamMHussain · Accepted Answer · 2016-04-28 12:44:41Z

3

You have to add the function of different name in MainActivity

public void closeRegForm1() {
    //Anything
}

Note: This should be public

And then call as

@JavascriptInterface
public void closeRegForm() {
    ((MainActivity)mContext).closeRegForm1();
}

answered Apr 28, 2016 at 12:44

IamMHussain

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