网络状态判断

public class NetState {    private Context context;    public NetState(Context context) {        this.context = context;    }    public Boolean NewWork(){// 1.获取系统服务        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        // 2.获取net信息        NetworkInfo info = manager.getActiveNetworkInfo();        // 3.判断网络是否可用        if (info != null&&info.isConnected()) {            return true;        } else {           return false;        }    }}