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detect javascript button press in webview?
<input id="testBtn" name="testBtn" type="button" value="Test Button"
class="button" onclick="test.run(this.id,'onclick');return false;"
onkeydown="test.run(this.id,'onkeydown');return false;" title="Test Button">

final class jocJavaScriptInterface {
    jocJavaScriptInterface() {
    }
    String myEvent;
    public void run(int id,String event) { //run method defined into your html.
        this.myEvent = event;
        mHandler.post(new Runnable() {
            public void run() {
        Toast.makeText(getApplicationContext(),myEvent + " my ButtoN!", Toast.LENGTH_LONG).show();
            }
        });
    }
}

WebContent.addJavascriptInterface(new jocJavaScriptInterface(), "test");
    WebContent.loadUrl("http://www.foo.com/Androidtest.html"); //load your Page with the button...
    WebSettings webSettings = WebContent.getSettings();
    webSettings.setSavePassword(false);
    webSettings.setSaveFormData(false);
    webSettings.setJavaScriptEnabled(true);
    webSettings.setSupportZoom(true);