WebView – powrót do poprzedniej strony po wciśnięciu przycisku wstecz

				
					        // while user using back key open previously page (if exist)
        webView.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View view, int keyCode, KeyEvent keyEvent) {
                if (keyEvent.getAction() == KeyEvent.ACTION_DOWN) {
                    switch (keyCode) {
                        case KeyEvent.KEYCODE_BACK: {
                            if (webView.canGoBack()) {
                                webView.goBack();
                            }
                        }
                    }
                }
                return false;
            }
        });