android 2.1 获取手机流量

在android 2.2以后（API 8），google提供了api：TrafficStats来获取手机的wifi、3G流量。
但是2.1（API 7）是没有这个静态类的，所以需要通过读取文件（/proc/net/dev）方式来判断

可以先 adb shell(不一定要挂载为root)后
$cat /proc/net/dev
Sql代码

Inter-|Receive|Transmit
face|bytespacketserrsdropfifoframecompressedmulticast|bytespacketserrsdropfifocollscarriercompressed
lo:365648000000365648000000
dummy0:0000000000000000
rmnet0:255725522870000006919661722000000
rmnet1:0000000000000000
rmnet2:0000000000000000
rmnet3:0000000000000000
rmnet4:0000000000000000
rmnet5:0000000000000000
rmnet6:0000000000000000
rmnet7:0000000000000000
rmnet8:0000000000000000
rmnet9:0000000000000000
rmnet10:0000000000000000
usb0:0000000000000000
tunl0:0000000000000000
sit0:0000000000000000
ip6tnl0:0000000000000000
wlan0:323412060000005766000000

Inter-|   Receive                                                |  Transmit face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed    lo:    3656      48    0    0    0     0          0         0     3656      48    0    0    0     0       0          0dummy0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet0: 2557255    2287    0    0    0     0          0         0   691966    1722    0    0    0     0       0          0rmnet1:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet2:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet3:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet4:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet5:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet6:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet7:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet8:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet9:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0rmnet10:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0  usb0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0 tunl0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0  sit0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0ip6tnl0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0 wlan0:   32341     206    0    0    0     0          0         0      576       6    0    0    0     0       0          0

其中：
tiwlan0 是 Wifi流量
rmnet0 是无线流量

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