@Override
 public void onConfigurationChanged(Configuration newConfig) {
   super.onConfigurationChanged(newConfig);
   if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
     ((ViewGroup) findViewById(R.id.fl_bottom_blank)).removeAllViews();
   } else {
     addNavigationOnBottom((ViewGroup) findViewById(R.id.fl_bottom_blank));
   }
 }
 @Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   initView();
   initData();
 }
 @Override
 public void onBackPressed() {
   if (webView.canGoBack()) webView.goBack();
   else super.onBackPressed();
 }