前言

• 利用Android自带的ConnectivityManager类
• 有时候连上了wifi，但这个wifi是上不了网的，我们可以通过ping www.baidu.com来判断是否可以上网
• 也可以利用get请求访问www.baidu.com，如果get请求成功，说明可以上网

Android 判断 网络连接

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;

}

利用 ping 判断 Internet 能够 请求成功

// 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;
}

其他方案 模拟 get 请求

 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);
 }

疑惑点

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