Question

用于计算扫描开始和结束时间的代码。一旦扫描开始就调用scanTime，并在收到结果后立即调用retTime，但是，获得两个retTime并且scanTime和retTime之间的差异不一致

public void startService() { 
    br = new BroadcastReceiver() {
        @Override
        public void onReceive(Context c, Intent intent) {
            if (location != null) {
                retTime =  System.currentTimeMillis() / 1000L;
                Log.i("end", Long.toString(retTime));
                sendResults(wifi.getScanResults(), androidID, Long.toString(retTime), location);
                Long result = retTime - scanTime;
            } else {
                Log.i("Location", "is Missing");
            }
        }

    };
    context.registerReceiver(br, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));

    t = new Thread(new Runnable() {
        public void run() {
            try {
                setSleepTime(dataTimeDifference);
                while (!Thread.interrupted()) {
                    wifi.startScan();
                    scanTime = System.currentTimeMillis() / 1000L;
                    Log.i("start", Long.toString(scanTime));
                    Thread.sleep(sleepingTime);
                }
            } catch (InterruptedException e) {
            }
        }
    });
    t.start();
}

Answer 1

简而言之，您知道触发BroadcastReceiver时扫描已完成。

这可能无法直接回答您的问题，但似乎这可能是实现您想要的功能的更好方法。不要在Runnable中使用Thread.sleep（）和while循环，只需依赖BroadcastReceiver来确定何时开始新的扫描。

另请注意，用户和操作系统都可以启动扫描，并且当扫描完成时也会触发BroadcastReceiver。

private final Runnable mStartScan = new Runnable() {
        @Override
        public void run() {
           wifi.startScan();
        }
}; 

public void startService() { 
    br = new BroadcastReceiver() {
        @Override
        public void onReceive(Context c, Intent intent) {

          String action = intent.getAction();
          if (action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)){

            if (location != null) {

                 sendResults(wifi.getScanResults(), androidID, Long.toString(retTime), location);

            } else {
                Log.i("Location", "is Missing");
            }

            t = new Thread(mStartScan);
            t.start(); 
          }  
        }

    };

    context.registerReceiver(br, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));

    t = new Thread(mStartScan);
    t.start();
}

你如何确定Android wifi startScan方法是否已经完成以便计算wifi扫描所需的时间？

1 个答案: