The method of judging network connection state in Android _android

App to determine whether users are connected to the network is a very common demand, the realization of the idea is probably the following several

• Take advantage of Android's own Connectivitymanager class
• Sometimes wifi, but this wifi is not on the net, we can ping www.baidu.com to determine whether the Internet
• You can also access www.baidu.com using a GET request, which means that if a GET request succeeds, you can surf the internet

1, to determine whether the network has been connected

Check all network Connect, WIFI or mobile public
static Boolean isnetworkavailable (final context) {
  Boo Lean Haswifocon = false;
  Boolean hasmobilecon = false;
 
  Connectivitymanager cm = (Connectivitymanager) context.getsystemservice (context. Connectivity_service);
  networkinfo[] Netinfos = Cm.getallnetworkinfo ();
  for (Networkinfo Net:netinfos) {
 
    String type = Net.gettypename ();
    if (Type.equalsignorecase ("WiFi")) {
      levellogutils.getinstance (). I (tag, "Get WiFi Connection");
      if (net.isconnected ()) {
        Haswifocon = true;
      }
    }
 
    if (Type.equalsignorecase ("mobile")) {
      levellogutils.getinstance (). I (Tag, "Get MOBILE Connection");
      if (net.isconnected ()) {
        Hasmobilecon = true;
      }
  }} return Haswifocon | | Hasmobilecon;
 
}

2, using ping to determine the Internet can request success
Note: sometimes connected to the network, but not to the extranet

Network available cannot ensure Internet is available public
static Boolean isnetworkavailable (final context Contex T) {
  Runtime Runtime = Runtime.getruntime ();
  try {
    Process pingprocess = runtime.exec ("/system/bin/ping-c 1 www.baidu.com");
    int exitcode = Pingprocess.waitfor ();
    return (ExitCode = 0);
  } catch (Exception e) {
    e.printstacktrace ();
  }
  return false;
}

Considering the network, we ping the www.baidu.com
Foreign words can ping 8.8.8.8

3. Other schemes simulate GET requests

You can also visit the Web site to see if a GET request succeeds

URL url = new URL ("http://www.google.com");
HttpURLConnection URLC = (httpurlconnection) url.openconnection ();
Urlc.setconnecttimeout (3000);
Urlc.connect ();
if (urlc.getresponsecode () = =) {return
  new Boolean (TRUE);
}

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