[Android Pro] Android7.0系统 关于Android获取流量计数TrafficStats.getUidRxBytes(uid)和TrafficStats.getUidTxBytes(uid)返回-1解决方案

时间：2022-12-10 23:36:04

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();

    }

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