监听网络状态，断网时报错：无法实例化该对象
监听是使用广播接受者，注册方式是代码和清单文件都用过了。
public class ConnectivityReceiver extends BroadcastReceiver｛
｝
报错是：
Unable to instantiate receiver xxx.ConnectivityReceiver:
java.lang.InstantiationException: xxx.ConnectivityReceiver
[解决办法]
ConnectivityReceiver的实例对象怎么初始化的呢？把代码贴出来看看
[解决办法]
