如何检查网络可用性？ [英] How to check the network availability?

问题描述

我必须使用两种无线服务器连接我的应用程序（如果可用）， 或GPRS（如果无线网络不可用）。 这是我的code检查连接的可用性

I have to connect my app with server using either wifi (if it is available), or gprs (if wifi is not available). Here is my code to check the connection availability

public static final boolean isConnectionAvailable(Activity a)
{  

  ConnectivityManager cm = (ConnectivityManager)a.getSystemService(Context.CONNECTIVITY_SERVICE);

  State mobile = cm.getNetworkInfo(0).getState();

  State wifi = cm.getNetworkInfo(1).getState();

  if (wifi == NetworkInfo.State.CONNECTED || wifi == NetworkInfo.State.CONNECTING)
    {
        return true;
    }
  if (mobile == NetworkInfo.State.CONNECTED || mobile == NetworkInfo.State.CONNECTING)
    {
        return true;
    }

   return false;
}      

这是一个正确的方法是什么？任何人都可以给我建议一个更好的办法？

Is this a correct way? Can anyone suggest me a better way?

推荐答案

下面的非常相似的方式工作，但不关心什么底层介质的额外的好处，因为它看起来好像有更多的不仅仅是WiFi的支持。也许这些也包括在移动，但该文档是不是超级清楚的：

The following very similar approach works, but has the added advantage of not caring what the underlying medium, since it looks as though there is support for more than just WiFi. Maybe these are also covered by mobile, but the docs aren't super clear:

// added as an instance method to an Activity
boolean isNetworkConnectionAvailable() {  
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo info = cm.getActiveNetworkInfo();     
    if (info == null) return false;
    State network = info.getState();
    return (network == NetworkInfo.State.CONNECTED || network == NetworkInfo.State.CONNECTING);
}     

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