当更多的数据进来时，我将如何让我的活动持续执行计算

Question

我正在尝试创建一个应用程序，该应用程序根据心电信号计算心率，心电信号通过蓝牙接收并发送到应用程序。我已经能够创建代码来检测ecg信号的峰值（这将是一个500个值的数组），计算心率并将其输出到屏幕。到目前为止，阵列是硬编码的。但我希望确保每次覆盖数组时，都会再次执行计算，并将新值输出到屏幕。因此，它本质上需要不断重复。我尝试在以下循环中插入整个代码：

while(true) { }

如下所示：

private class ProcessECG extends Thread {
    public ProcessECG() {

    }

        public void run() {

        heartRateValues = (TextView) findViewById(R.id.heartRateValues);

        double rawHeartData[] = {0.024, -0.016, -0.032, 0.016, -0.008, 0.024, 0.016, -0.016, 0.016, -0.016, 0.0, 0.112, 0.096, -0.264, -0.272, 0.136, 0.272, 0.096, 0.088, -0.016, 0.024, -0.024, -0.008, -0.04, -0.032, 0.008, -0.024, 0.008, -0.016, 0.016, 0.024, -0.024, -0.016, 0.016, -0.016, 0.016, -0.016, 0.016, 0.024, -0.008, 0.008, 0.056, 0.056, 0.008, 0.016, -0.032, -0.032, 0.0, -0.024, 0.008, -0.016, 0.024, -0.016, 0.024, -0.016, 0.016, -0.016, 0.016, 0.016, -0.016, 0.024, -0.016, -0.008, 0.024, -0.016, 0.024, 0.024, -0.016, -0.008, 0.016, 0.024, -0.016, 0.016, -0.016, -0.016, 0.024, -0.016, 0.024, -0.008, 0.024, -0.016, 0.024, 0.024, -0.016, -0.016, 0.024, -0.016, 0.016, 0.016, -0.016, -0.016, 0.024, 0.016, -0.024, -0.016, 0.024, 0.024, -0.016, 0.016, -0.016, -0.016, 0.048, 0.08, -0.064, -0.08, -0.216, -0.144, 0.2, 0.208, 0.024, 0.024, -0.008, 0.008, -0.032, -0.032, 0.008, -0.024, 0.016, 0.016, -0.024, -0.024, 0.016, 0.016, -0.024, -0.016, 0.016, -0.024, 0.016, -0.008, 0.016, -0.008, 0.032, 0.008, 0.048, 0.032, -0.016, 0.0, -0.032, -0.032, 0.0, -0.024, 0.024, 0.024, -0.016, -0.024, 0.024, -0.016, 0.016, 0.024, -0.016, -0.016, 0.024, 0.024, -0.016, -0.016, 0.024, 0.024, -0.016, -0.016, 0.016, 0.024, -0.016, -0.016, 0.024, -0.016, 0.024, -0.016, 0.024, -0.008, 0.024, 0.016, -0.016, -0.016, 0.024, -0.016, 0.016, -0.016, 0.016, -0.008, 0.024, 0.016, -0.016, -0.008, 0.024, -0.016, 0.024, 0.016, -0.024, 0.008, -0.024, -0.008, 0.024, 0.024, -0.016, -0.008, 0.016, -0.008, 0.08, 0.064, -0.264, -0.232, 0.192, 0.224, 0.072, 0.056, -0.032, 0.016, -0.032, -0.032, -0.008, -0.032, 0.008, 0.016, -0.016, -0.024, 0.016, -0.016, 0.016, 0.024, -0.016, 0.016, -0.024, 0.016, -0.016, -0.008, 0.024, 0.0, 0.04, 0.056, 0.0, 0.024, -0.024, 0.0, -0.032, -0.032, 0.016, -0.024, 0.016, -0.016, 0.016, 0.024, -0.016, 0.024, -0.008, -0.016, 0.016, -0.016, 0.016, 0.016, -0.016, 0.024, -0.016, 0.024, -0.016, -0.016, 0.024, -0.016, 0.016, -0.016, 0.024, 0.024, -0.016, 0.024, -0.016, -0.016, 0.016, -0.016, 0.024, 0.024, -0.024, 0.016, -0.016, 0.024, -0.016, 0.016, -0.016, -0.016, 0.016, -0.016, 0.024, 0.024, -0.016, -0.008, 0.024, -0.008, 0.104, 0.08, -0.28, -0.28, 0.12, 0.256, 0.128, 0.12, -0.032, 0.008, -0.016, -0.04, -0.008, -0.032, 0.008, 0.0, -0.024, -0.016, 0.024, -0.016, 0.016, 0.024, -0.024, -0.024, 0.016, 0.016, -0.016, -0.016, 0.024, 0.0, 0.056, 0.056, 0.0, 0.016, -0.032, 0.0, -0.032, -0.032, 0.016, -0.024, 0.016, -0.024, 0.016, -0.016, 0.016, 0.016, -0.016, -0.016, 0.024, 0.016, -0.016, 0.016, -0.016, -0.016, 0.024, -0.008, 0.024, -0.016, 0.024, -0.016, 0.024, -0.016, 0.024, -0.016, 0.024, 0.024, -0.016, 0.024, -0.016, 0.016, -0.008, -0.016, 0.016, -0.016, 0.016, 0.016, -0.016, 0.024, -0.016, -0.016, 0.024, -0.016, 0.024, 0.024, -0.032, 0.008, -0.032, -0.008, 0.024, 0.024, -0.008, 0.024, -0.016, -0.016, 0.024, 0.112, -0.072, -0.088, -0.272, -0.128, 0.272, 0.248, -0.008, 0.024, -0.024, 0.0, -0.048, -0.032, 0.0, -0.032, 0.008, -0.032, 0.016, -0.024, 0.016, 0.016, -0.016, 0.024, -0.016, 0.016, -0.024, -0.016, 0.016, -0.016, 0.024, 0.008, 0.056, 0.04, -0.008, 0.016, -0.032, -0.04, 0.0, -0.024, 0.016, 0.016, -0.024, 0.016, -0.016, 0.024, -0.016, -0.016, 0.016, -0.016, 0.024, -0.016, 0.016, 0.024, -0.008, 0.024, -0.016, -0.016, 0.024, -0.016, 0.016, 0.016, -0.016, -0.016, 0.024, 0.024, -0.016, -0.008, 0.024, 0.016, -0.024, -0.008, 0.024, 0.024, -0.032, 0.024, -0.016, -0.008, 0.016, -0.016, 0.024, -0.016, 0.024, 0.024, -0.016, 0.024, -0.016, -0.016, 0.016, -0.024, 0.008, -0.008, 0.024, 0.024, -0.016, 0.024, -0.016, -0.016, 0.04, 0.096, -0.152, -0.256, -0.112, -0.088, 0.264, 0.248, 0.008, -0.024, 0.008, 0.0, -0.04, -0.032, 0.0, -0.032, 0.008, -0.024, 0.016, -0.024, 0.016, -0.016, 0.024, -0.024, 0.016, 0.016, -0.024, -0.016, 0.024, -0.008, 0.032, 0.008, 0.056, 0.04, -0.016, 0.008, -0.032, 0.0, -0.032, -0.032, 0.016, -0.016, 0.016, 0.016, -0.016, 0.024, -0.016, -0.016, 0.024, -0.016, 0.024, -0.016, 0.016, 0.024, -0.016, 0.024, -0.016, -0.024, 0.024, -0.016, 0.024, -0.016, 0.016, -0.016, 0.016, 0.024, -0.016, 0.024, -0.008, -0.016, 0.024, -0.024, 0.016, -0.016, 0.016, -0.016, 0.024, 0.024, -0.016, -0.008, 0.024, 0.016, -0.024, -0.032, 0.008, -0.008, 0.024, 0.024, -0.016, 0.016, -0.016, -0.016, 0.064, 0.104, -0.224, -0.264, 0.024, 0.04, 0.248, 0.176, -0.024, -0.032, 0.016, -0.032, 0.0, 0.0, -0.032, 0.016, -0.024, -0.032, 0.008, -0.016, 0.016, 0.016, -0.032, 0.016, -0.024, 0.016, -0.016, -0.016, 0.024, -0.008, 0.04};


        double max = 0;
        for (int i = 0; i <rawHeartData.length; i++) {
            if (rawHeartData[i] > max) {
                max = rawHeartData[i];
            }
        }
        double threshold = 0.7*max;



        while (true) {

            //Calculate Heart Rate from list "Raw Data"
            int upflag = 0;
            int last = 1;
            int p = 0;
            int t = 0;
            int count = 0;
            //List<Double> heartRate2 = new ArrayList<Double>();
            int heartRate[] = new int[7];

            for (int i = 0; i < rawHeartData.length; i++) {
                if (rawHeartData[i]> threshold){
                    if (upflag == 0){
                        if (last > 0){
                            t = i - last;
                            p = 100*60/t;
                            //100 is the sampling rate

                            heartRate[count]= p;
                            count = count + 1;
                            //int k = (int) p;
                            //heartRate2.add(p);
                        }
                        last = i;
                    }
                    upflag = 50;
                }

                else {
                    if (upflag > 0){
                        upflag = upflag -1;
                    }
                }

            }
            //Change array to String and display last value
            String heartRate3 = Arrays.toString(heartRate);
            String[] bits = heartRate3.split(",");
            String lastValue = bits[bits.length-1];

            heartRateValues.setText(lastValue + "bpm");

        }

        }


}

但是，这一直导致我的应用程序崩溃，我得到了以下错误：

03-15 14:22:50.809  10094-10300/es.pymasde.blueterm E/AndroidRuntime﹕ FATAL EXCEPTION: Thread-1165
Process: es.pymasde.blueterm, PID: 10094
android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
        at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:6247)
        at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:867)
        at android.view.View.requestLayout(View.java:17364)
        at android.view.View.requestLayout(View.java:17364)
        at android.view.View.requestLayout(View.java:17364)
        at android.view.View.requestLayout(View.java:17364)
        at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:360)
        at android.view.View.requestLayout(View.java:17364)
        at android.widget.TextView.checkForRelayout(TextView.java:6855)
        at android.widget.TextView.setText(TextView.java:4047)
        at android.widget.TextView.setText(TextView.java:3905)
        at android.widget.TextView.setText(TextView.java:3880)
        at es.pymasde.blueterm.ProcessActivity$ProcessECG.run(ProcessActivity.java:164)

当涉及到setText时，它会出错，但当代码位于while循环之外时，它会非常好地工作。针对我的错误，我找到了以下链接：Android“只有创建视图层次结构的原始线程才能接触其视图。”然而，片段中出现错误，我仍然不确定如何使用runOnUIThread。这是最好的解决方案吗？或者，对于如何确保我的计算在新数据到来时不断实时执行，有什么想法吗？

Answer 1

好吧，无论如何，您都需要在用户界面线程上setText。

但是，根据您正在处理的数据量和频率，您可能希望在不会导致UI线程过多工作的间隔内执行此操作。