Android Webview make back button go to previous page

 }

    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if (event.getAction() == KeyEvent.ACTION_DOWN ){


            switch (keyCode) {

                case KeyEvent.KEYCODE_BACK:

                    if (mWebView.canGoBack()) {

                        mWebView.goBack();
                    }else {

                        finish();
                    }

                    return true;            }


        }

        return super.onKeyDown(keyCode,event);    }
}