对话框如果没有互联网连接

Question

如果没有互联网连接，用户点击按钮，它会显示一些错误消息，使用对话框。我试图navigator.online在我的Android手机webview.its不working.how使用jquery显示消息，或使用json显示消息而不使用java。

Answer 1

private boolean checkInternetConnection() { 
    ConnectivityManager conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
    if (conMgr.getActiveNetworkInfo() != null 
      && conMgr.getActiveNetworkInfo().isAvailable() 
      && conMgr.getActiveNetworkInfo().isConnected()) { 
     return true; 
    } else { 
     Toast toast = Toast 
       .makeText(
         getApplicationContext(), 
         "No Internet Connection Found !!! Please Connect To Internet First", 
         Toast.LENGTH_LONG); 
     toast.setGravity(Gravity.CENTER, 0, 0); 
     toast.show(); 
     new Thread(new Runnable() { 
      public void run() { 
       try { 
        Thread.sleep(5000); 
        finish(); 
       } catch (InterruptedException e) { 
        e.printStackTrace(); 
       } 
      } 
     }).start(); 
     return false; 
    } 
}