Android机顶盒获取网络带宽

        Android盒子网络带宽分为2种情况，一种是以太网络，一种是无线网络。获取无线网络带宽比较简单，只要通过wifiInfo.getLinkSpeed()就可以获取得到，单位是”Mbps",即wifiInfo.LINK_SPEED_UNITS。获取以太网的带宽即获取以太网卡的带宽可以通过执行shell命令"cat /sys/class/net/eth0/speed"来获取。

    public String getNetSpeed(Context context) {
        WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        ConnectivityManager cm = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (cm == null) {
            return null;//无连接
        }
        NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        if (networkInfo == null || !networkInfo.isAvailable()) {
            return null;//无连接
        }
        int type = networkInfo.getType();
        if (type == ConnectivityManager.TYPE_WIFI) {
            String speed = wifiInfo.getLinkSpeed() + wifiInfo.LINK_SPEED_UNITS;
            return speed;
        } else if (type == ConnectivityManager.TYPE_ETHERNET) {
            String speed = runShellCommand("cat /sys/class/net/eth0/speed").trim() + "Mbps";
            return speed;
        }
        return null;
    }

    //执行shell命令
    public static String runShellCommand(String command) {
        Runtime runtime;
        Process proc = null;
        StringBuffer stringBuffer = null;
        try {
            runtime = Runtime.getRuntime();
            proc = runtime.exec(command);
            stringBuffer = new StringBuffer();
            if (proc.waitFor() != 0) {
                System.err.println("exit value = " + proc.exitValue());
            }
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    proc.getInputStream()));

            String line = null;
            while ((line = in.readLine()) != null) {
                stringBuffer.append(line + " ");
            }

        } catch (Exception e) {
            System.err.println(e);
        } finally {
            try {
                proc.destroy();
            } catch (Exception e2) {
            }
        }
        return stringBuffer.toString();
    }