Android笔记之察看网络状况

1、判断是否能连接internet

private ConnectivityManager manager;// 登陆前检查网络配置
manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkinfo = manager.getActiveNetworkInfo();
            if (networkinfo == null || !networkinfo.isAvailable()) {
                Toast.makeText(LoginActivity.this, "无法连接到网络，请检查网络配置",
                        Toast.LENGTH_LONG).show();
            }

Done！