Building custom WebView With Cordova 5.0 in Androi

I want to build a custom WebView with Cordova. To do this I want to override setWebChromeClient and the setWebViewClient methods. But for that I need to have a SystemWebViewClient which requires a SystemWebViewEngine, which I cant seem to get at this point. Heres my main activity

public class MyActivity extends CordovaActivity implements CordovaInterface {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        int threadSize = getResources().getInteger(R.integer.WIPThreadPoolSize);

        // Initiate Thread pool
        threadPool = new ThreadPoolExecutor(threadSize, threadSize, 10, TimeUnit.SECONDS, this.priorityQueue);

        initApplicationInformationManager();

        // initialize global variables
        GlobalApplicationVariables.initValues(this);

        isActivityReady = false;

        isActivityReady = false;

        setContentView(R.layout.main_layout);
        super.init();

    }


    protected CordovaWebView makeWebView() {

        SystemWebView webView = (SystemWebView) findViewById(R.id.customWebView);
       SystemWebViewEngine engine = new SystemWebViewEngine(webView);


        return new CordovaWebViewImpl(engine);
    }

   protected void createViews() {
        appView.getView().requestFocusFromTouch();
    }
}

And my custom webview:

@SuppressLint("SetJavaScriptEnabled")
public class CustomWebView extends SystemWebView {

    private DebugServiceClient dbgClient;

    public CustomWebView(Context context) {
        super(context);

        this.configureView(context);
    }

   public CustomWebView(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
        this.configureView(context);
    }

    /**
     * Configure the web view.
     *
     * @param context
     *            Context web view is running in.
     */
    private void configureView(Context context) {
        //Make the WebView visible and hide its scroll bars
        setVisibility(View.VISIBLE);
        setVerticalScrollBarEnabled(false);
        setHorizontalScrollBarEnabled(false);
        setOverScrollMode(OVER_SCROLL_NEVER);

        WebSettings webSettings = getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setSupportZoom(false);
        webSettings.setAppCacheEnabled(false);
        webSettings.setDomStorageEnabled(true);


        final MyActivity myActivity = (MyActivity) context;


        setWebChromeClient(new SystemWebChromeClient(new SystemWebViewEngine(this)) {

            public void onShowCustomView(View view, CustomViewCallback callback) {
           /*Custom code*/
            }

            public void onHideCustomView() {

            /*Custom code*/

            }
        });

        setWebViewClient(new SystemWebViewClient(new SystemWebViewEngine(this)) {

            public boolean shouldOverrideUrlLoading(WebView webview, String url) {
            /*Custom code*/    
            }

            public void onReceivedError(WebView view, int errorCod, String description, String failingUrl) {
                Log.e("Webview Error", errorCod + " - " + description + failingUrl);
            }
        }); 
    }        
}

Can't really get an engine so that the methods can be overwritten, so I just created one on the fly but this generates some errors. Additionally I cant seem to access the Cordova Plugin Manager and consequently I'm not able to add plugins to the webview. Which is the best way to do this?

I'm overrided SystemWebViewClient with this overrided method in MainActivity

@Override
protected CordovaWebViewEngine makeWebViewEngine() {
    CordovaWebViewEngine ret = CordovaWebViewImpl.createEngine(this, preferences);
    ((SystemWebView)ret.getView()).setWebViewClient(new SystemWebViewClient((SystemWebViewEngine)ret){
        @Override
        public void onReceivedSslError(WebView view, final SslErrorHandler handler, SslError error) {
            LOG.d(TAG, "ON RECEIVED SSL ERROR");
            super.onReceivedSslError(view, handler, error);
        }
    });
    return ret;
}