App判断用户是否联网是很普遍的需求，实现思路大概有下面几种
1、判断网络是否已经连接
// check all network connect, WIFI or mobile
public static boolean isNetworkAvailable(final Context context) {
boolean 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、利用 ping 判断 Internet 能够 请求成功
Note：有时候连上了网络, 但却上不去外网
// network available cannot ensure Internet is available
public static boolean isNetWorkAvailable(final Context context) {
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;
}
考虑到网络, 我们 ping 了www.baidu.com
国外的话可以 ping 8.8.8.8
3、其他方案 模拟 get 请求
也可以访问网址, 看 get 请求能不能成功
URL url = new URL("http://www.google.com");
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
urlc.setConnectTimeout(3000);
urlc.connect();
if (urlc.getResponseCode() == 200) {
return new Boolean(true);
}
以上就是本文的全部内容，希望对大家学习Android软件编程有所帮助。
