在清單檔案中新增許可權

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
        <uses-permission android:name="android.permission.INTERNET" />

Java程式碼

 public static boolean isNetworkAvaliable(Context context){
        ConnectivityManager manager= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if
 
(manager!=null){
            NetworkInfo info=manager.getActiveNetworkInfo();
            if(info!=null&& info.isConnected()){
                if(info.getState()==NetworkInfo.State.CONNECTED){
                    return true;
                }
            }
        }
        return false;
    }