reference : http://blog.csdn.net/zhangyong7112/article/details/54574214
最近一个关于流量的项目在Android7.0系统的手机上运行，一直获取不到流量的使用数据，查看源码然后发现TrafficStats.getUidRxBytes(uid)和TrafficStats.getUidTxBytes(uid)一直都是返回的-1，
// 获取某个网络UID接收和发送字节的总和 long total = TrafficStats.getUidRxBytes(uid) + TrafficStats.getUidTxBytes(uid);
这就纳闷了！！！然后多方查找资料，问了公司的大神，给我说可以在“/proc/uid_stat/"文件夹中读取数据。后来总算是出来了。。。 不说了 贴代码
if (total == 0 || (TrafficStats.getUidRxBytes(uid) == -1) && (TrafficStats.getUidTxBytes(uid) == -1)) { total = getTotalBytesManual(uid); }
/** * 通过uid查询文件夹中的数据 * @param localUid * @return */ private Long getTotalBytesManual(int localUid) { // Log.e("BytesManual*****", "localUid:" + localUid); File dir = new File("/proc/uid_stat/"); String[] children = dir.list(); StringBuffer stringBuffer = new StringBuffer(); for (int i = 0; i < children.length; i++) { stringBuffer.append(children[i]); stringBuffer.append(" "); } // Log.e("children*****", children.length + ""); // Log.e("children22*****", stringBuffer.toString()); if (!Arrays.asList(children).contains(String.valueOf(localUid))) { return 0L; } File uidFileDir = new File("/proc/uid_stat/" + String.valueOf(localUid)); File uidActualFileReceived = new File(uidFileDir, "tcp_rcv"); File uidActualFileSent = new File(uidFileDir, "tcp_snd"); String textReceived = "0"; String textSent = "0"; try { BufferedReader brReceived = new BufferedReader(new FileReader(uidActualFileReceived)); BufferedReader brSent = new BufferedReader(new FileReader(uidActualFileSent)); String receivedLine; String sentLine; if ((receivedLine = brReceived.readLine()) != null) { textReceived = receivedLine; // Log.e("receivedLine*****", "receivedLine:" + receivedLine); } if ((sentLine = brSent.readLine()) != null) { textSent = sentLine; // Log.e("sentLine*****", "sentLine:" + sentLine); } } catch (IOException e) { e.printStackTrace(); // Log.e("IOException*****", e.toString()); } // Log.e("BytesManualEnd*****", "localUid:" + localUid); return Long.valueOf(textReceived).longValue() + Long.valueOf(textSent).longValue(); }
