android webview点击返回键返回上一级activity

android webview点击返回键返回上一个activity

 @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {
         // TODO Auto-generated method stub
         if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
             return true;
         }
         return super.onKeyDown(keyCode, event);
     }