android 实时获取网速

public class NetSpeed {
    private static final String TAG = NetSpeed.class.getSimpleName();
    private long lastTotalRxBytes = 0;
    private long lastTimeStamp = 0;

    public String getNetSpeed(int uid) {
        long nowTotalRxBytes = getTotalRxBytes(uid);
        long nowTimeStamp = System.currentTimeMillis();
        long speed = ((nowTotalRxBytes - lastTotalRxBytes) * 1000 / (nowTimeStamp - lastTimeStamp));//毫秒转换
        lastTimeStamp = nowTimeStamp;
        lastTotalRxBytes = nowTotalRxBytes;
        return String.valueOf(speed) + " kb/s";
    }


    //getApplicationInfo().uid
    public long getTotalRxBytes(int uid) {
        return TrafficStats.getUidRxBytes(uid) == TrafficStats.UNSUPPORTED ? 0 : (TrafficStats.getTotalRxBytes() / 1024);//转为KB
    }

public class NetSpeedTimer {
    private long defaultDelay = 1000;
    private long defaultPeriod = 1000;
    private static final int ERROR_CODE = -101011010;
    private int mMsgWhat = ERROR_CODE;
    private NetSpeed mNetSpeed;
    private Handler mHandler;
    private Context mContext;
    private SpeedTimerTask mSpeedTimerTask;

    public static final int NET_SPEED_TIMER_DEFAULT = 101010;

    public NetSpeedTimer(Context context, NetSpeed netSpeed, Handler handler) {
        this.mContext = context;
        this.mNetSpeed = netSpeed;
        this.mHandler = handler;
    }

    public NetSpeedTimer setDelayTime(long delay) {
        this.defaultDelay = delay;
        return this;
    }

    public NetSpeedTimer setPeriodTime(long period) {
        this.defaultPeriod = period;
        return this;
    }

    public NetSpeedTimer setHanderWhat(int what) {
        this.mMsgWhat = what;
        return this;
    }

    /**
     * 开启获取网速定时器
     */
    public void startSpeedTimer() {
        Timer timer = new Timer();
        mSpeedTimerTask = new SpeedTimerTask(mContext, mNetSpeed, mHandler,
                mMsgWhat);
        timer.schedule(mSpeedTimerTask, defaultDelay, defaultPeriod);
    }

    /**
     * 关闭定时器
     */
    public void stopSpeedTimer() {
        if (null != mSpeedTimerTask) {
            mSpeedTimerTask.cancel();
        }
    }

    /**
     * @author
     * 静态内部类
     */
    private static class SpeedTimerTask extends TimerTask {
        private int mMsgWhat;
        private NetSpeed mNetSpeed;
        private Handler mHandler;
        private Context mContext;

        public SpeedTimerTask(Context context, NetSpeed netSpeed,
                              Handler handler, int what) {
            this.mContext = context;
            this.mHandler = handler;
            this.mNetSpeed = netSpeed;
            this.mMsgWhat = what;
        }

        @Override
        public void run() {
            // TODO Auto-generated method stub
            if (null != mNetSpeed && null != mHandler) {
                Message obtainMessage = mHandler.obtainMessage();
                if (mMsgWhat != ERROR_CODE) {
                    obtainMessage.what = mMsgWhat;
                } else {
                    obtainMessage.what = NET_SPEED_TIMER_DEFAULT;
                }
                obtainMessage.obj = mNetSpeed.getNetSpeed(mContext
                        .getApplicationInfo().uid);
                mHandler.sendMessage(obtainMessage);
            }
        }
    }
}

调用：

private void initNewWork() {
        //创建NetSpeedTimer实例
        mNetSpeedTimer = new NetSpeedTimer(mContext, new NetSpeed(), mHandler).setDelayTime(1000).setPeriodTime(2000);
        //在想要开始执行的地方调用该段代码
        mNetSpeedTimer.startSpeedTimer();
    }


 private Handler mHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == NetSpeedTimer.NET_SPEED_TIMER_DEFAULT){
                String speed = (String) msg.obj;
                //打印你所需要的网速值，单位默认为kb/s
                Log.i(TAG, "current net speed  = " + speed);
            }
        }
    };