android - onDraw() not called in WebView -

i need load html webview once put ondraw() method not called if put setwillnotdraw(false) constructor. trying @override dispatchdraw() result same - nothing done.

public mywebview(context context) {         super(context);         this.setwillnotdraw(false);         initialize(context);     }       private void initialize(context context) {         setlayoutparams(new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content));         this.html = new myhtml();         this.html.baseurl = "";         try {             this.html.loadhtml(context, "htmljh.html");             this.webview = new webview(context);             this.webview.getsettings().setallowfileaccess(true);             this.webview.getsettings().setjavascriptenabled(true);         } catch (ioexception e) {             e.printstacktrace();         }         webview.setlayoutparams(new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content));         this.addview(webview);     }      /**loading html when view attached window**/     @override     protected void onattachedtowindow (){         super.onattachedtowindow();         loadbasehtml(); //this method loads needed scripts , define how web view looks (except of size, done onmeasure())     }      @override     protected void onmeasure (int widthmeasurespec,                     int heightmeasurespec){         super.onmeasure(widthmeasurespec, heightmeasurespec);         system.out.println("measure size...");         float density = getresources().getdisplaymetrics().density;         float height = getresources().getdisplaymetrics().heightpixels;         this.html.prepareviewwidth(math.round(getwidth()/density), math.round(height/density*2/5));     }       @override     protected void ondraw(canvas canvas){         super.ondraw(canvas);         system.out.println("drawing view...");         this.html.injectjavascripttohtml();         this.webview.loaddatawithbaseurl("file:///android_asset/", this.html.html, "text/html", "utf-8", ""); } 

i have read questions not calling ondraw() none of them helpful. appreciate help. thank you!

@edit

invalidate() doesn't work too