在Android设备上监控WiFi

Question

我需要在我的应用程序中处理几个Wifi场景，希望得到建议。

假设我的应用程序正在运行且设备空闲一段时间并进入睡眠模式。在睡眠模式下，Wifi会自动关闭。现在，当设备从睡眠模式恢复时，打开Wifi状态需要一些时间。 如果在此期间应用程序后台服务正在进行http请求，我们如何处理这种情况？

或者，假设Wifi不可用，设备正在尝试连接到GPRS/3G，如果在此期间用户/后台服务正在进行http请求，我们如何在代码中处理它？

- MegaMind

Answer 1

1. You can list network interfaces, their type and connectivity status:

   Get all network interfaces:

   NetworkInfo[] networkInfos = ConnectivityManager.getAllNetworkInfo();
   

   check type of network interface

   networkInfo.getType() == ConnectivityManager.TYPE_MOBILE // or TYPE_WIFI
   

   check status against NetworkInfo.State

   networkInfo.getState() == NetworkInfo.State.CONNECTED
   

2. If you need a connection then you can:

   a. Check the network status as described above.

   b. Register a Receiver to get update info when network connectivity changes: Intent action for network events in android sdk

3. If you try to get a HTTP data when there is no connectivity you will get an exception. You can catch this and retry later, but option 2. is better.

- Peter Knego