@Override
 public void onDestroy() {
   super.onDestroy();
   mWebView.clearHistory();
   mWebView.clearCache(true);
 }
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState, R.layout.webview_map, this);
   mContext = this;
   setupViews();
 }