absolute beginner: android adding webview and load local page

sorry to bother you with this simple question, but I’m not able to find in internet tha answer because seems the answer outdated…
I’d like to add a webview programmatically on a top of a cocos2d 2.1.4 layer…
I had found this answer (even if it is not a webview):

LinearLayout.LayoutParams adParams = new LinearLayout.LayoutParams(
                getWindowManager().getDefaultDisplay().getWidth(),                        
                getWindowManager().getDefaultDisplay().getHeight()+getWindowManager().getDefaultDisplay().getHeight()-50);

        adView = new AdView(SimpleGame.this, AdSize.BANNER, "your Ad ID");
adView.setAdListener(SimpleGame.this);                            
        AdRequest request = new AdRequest();
        request.addTestDevice(AdRequest.TEST_EMULATOR);
        adView.loadAd(request);                

        CCDirector.sharedDirector().getActivity().addContentView(adView,adParams);

however getActivity is not inside cocos2dx anymore…
there is some tutorial on this topic?
I think that is a problem faced from all programmers soon or later…
please help…
thanks

I tried with this:
in java file “public class POP extends Cocos2dxActivity{”
i have placed:

    private static Cocos2dxActivity me = null;///mio
    public static WebView _webView=null;

    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState); 
        me=this;
        _webView=new WebView(this);
    }


   public static void DisplayWebView() {
//      _webView =new WebView(me);
        me.runOnUiThread(new Runnable() {
            public void run() {
                _webView.loadUrl("file:///android_asset/iCD_credits_it.html");
            }
        });
    }

in helloworld.cpp

void HelloWorld::creditsCB(){
CCLog("credits");
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
CCLog("buton");
    JniMethodInfo methodInfo;
    if (!JniHelper::getStaticMethodInfo(methodInfo, "it/enigma/POP/POP", "DisplayWebView", "()V"))
    {
        // error handling
        CCLog("err test");
    }
    CCLog("ok test");
    methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
#endif
}

“file:///android_asset/iCD_credits_it.html” or www.google.com …no error like file not found, simply not do anything