本文探讨了如何在Android中实现流量统计，主要关注TrafficStats类中的方法，如getMobileTxPackets、getMobileRxPackets等。文章详细解释了getTotalTxBytes方法的工作原理，涉及BPF（伯克利包过滤器）和系统文件的交互，以及如何通过bpfGetIfaceStats和parseIfaceStats获取流量数据。
最近做个需求要在native层的某个应用中加入流量统计，所以研究了一下Android自带的流量统计代码，将JNI中的代码直接移植到了我需要的地方
Android提供的流量统计功能在TrafficStats.java类中，包含以下几个：
- public static long getMobileTxPackets() //Return number of packets transmitted across mobile networks since device boot
- public static long getMobileRxPackets() //Return number of packets received across mobile networks since device boot
- public static long getMobileTxBytes() //Return number of bytes transmitted across mobile networks since device boot
- public static long getMobileRxBytes() //Return number of bytes received across mobile networks since device boot
- public static long getMobileTcpRxPackets() //tcp received
- public static long getMobileTcpTxPackets() //tcp transmitted
- public static long getTotalTxPackets //Return number of packets transmitted since device boot
- public static long getTotalRxPackets() //Return number of packets received since device boot
- public static long getTotalTxBytes() //Return number of bytes transmitted since device boot
- public static long getTotalRxBytes()
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