获取android的实时网速

/**
* 获取网络的时时网速，使用方法是：
* 每隔一段时间读取一次总流量，然后用本次和前一次的差除以间隔时间来获取平均速度，再换算为 K/s M/s
* 等单位，显示即可。
*
* @return 实时的网速（单位byte）
*/
public static int getNetSpeedBytes() {
String line;
String[] segs;
int received = 0;
int i;
int tmp = 0;
boolean isNum;
try {
FileReader fr = new FileReader("/proc/net/dev");
BufferedReader in = new BufferedReader(fr, 500);
while ((line = in.readLine()) != null) {
line = line.trim();
if (line.startsWith("rmnet") || line.startsWith("eth") || line.startsWith("wlan")) {
segs = line.split(":")[1].split(" ");
for (i = 0; i < segs.length; i++) {
isNum = true;
try {
tmp = Integer.parseInt(segs[i]);
} catch (Exception e) {
isNum = false;
}
if (isNum == true) {
received = received + tmp;
break;
}
}
}
}
in.close();
} catch (IOException e) {
return -1;
}
return received;
}