webView中js调用android方法一调用程序就退出是怎么回事

webView中js调用android方法一调用程序就退出是怎么回事 webView.addJavascriptInterface(new Object(){          public void showToast(String name){          Toast.makeText(SujieEasyActivity.this, name+"sdsdfsdfsf", Toast.LENGTH_LONG).show();          }                   public void setVisableFlase(){          Toast.makeText(SujieEasyActivity.this, "onfocus", Toast.LENGTH_SHORT).show();          if(menus!=null){          menus.setVisibility(View.GONE);          }             }                       public void setVisableTrue(){          Toast.makeText(SujieEasyActivity.this, "onblurs", Toast.LENGTH_SHORT).show();             }         }, "myObj"); android方法里面想让控件隐藏起来