Hi everyone,
I have resolved my little problem with showing Google map via WebView. When I tried to show map in WebView, I had seen only white box and nothing more, after short delay loading animation appeared and it was all. I was finding solution, but nowhere was described what I am doing wrong. Solution was very simple – I had to set myWebView.getSettings().setJavaScriptEnabled(true); … Simple, isn’t it? 
I hope that it will be helpful for someone who will has similar stupid problem.