android - 可以观察网络状态吗？

Question

我想知道是否有办法以某种方式注册为网络访问的观察者（并在互联网可用时运行一些回调函数），或者轮询是否是唯一的方法。谢谢！

Answer 1

您可以注册接收器：

//Callback  
private final BroadcastReceiver mNetworkStateReceiver = new BroadcastReceiver() {
    @Override
        public void onReceive(Context context, Intent intent) {
           //network state changes, you can process it, inforamtion in intent
        }
    };

//registering recievr in actibity or in service
IntentFilter mNetworkStateFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(mNetworkStateReceiver , mNetworkStateFilter);

详情见：http: //developer.android.com/reference/android/net/ConnectivityManager.html