Cannot call javascript methods from java

Question

I cannot call a JavaScript method from Java!

I included this in the main java file:

 JavaScriptInterface jsInterface = new JavaScriptInterface(this);
        cordova_webview.getSettings().setJavaScriptEnabled(true);
        cordova_webview.addJavascriptInterface(jsInterface, "JSInterface");

@Override 
protected void onPause() { 
    super.onPause(); 
    cordova_webview.loadUrl("javascript:punish()");
    Log.d(TAG, "onPause");
}

BUT I get this error in logacat:

07-15 17:25:18.490: D/CORDOVA_ACTIVITY(6422): onPause
07-15 17:25:18.495: D/CordovaLog(6422): null: Line 1 : Uncaught ReferenceError: punish is not defined
07-15 17:25:18.495: E/Web Console(6422): Uncaught ReferenceError: punish is not defined at null:1

the method is in index.js, which is included in the html.

However I tried to include the method in the html through a <script> tag and it's executing, but only after onResume!

How can I solve this?

radical · Accepted Answer · 2014-07-15 15:58:20Z

1

You could try this, in your javascript code, set:

window.fn = punish;

and then call window.fn() from your android code:

cordova_webview.loadUrl("javascript:window.fn()");

'fn' is not special here. We are just trying to make your function visible or accessible. 'window' object is already accessible, so we just set a reference to your function there. So, for example,

window.myFunc1 = punish;

.. would be fine too. I'm not entirely sure why this is required, but I'm posting this here anyway.

answered Jul 15, 2014 at 15:58

radical

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Alex Stanese · Accepted Answer · 2014-07-15 16:09:44Z

0

Actually this is what made the difference and now it works fine: window.fn = punish in my JS code, and then call window.fn() from your android code

answered Jul 15, 2014 at 16:09

Alex Stanese

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