Android 计步器：计算活动持续时间

如何解决Android 计步器：计算活动持续时间

我开发了一款可以计算步数的计步器应用。我还需要用户活动的持续时间来说明例如今天用户步行了 30 分钟。 我使用 sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER) 来计算步数。在方法 onSensorChanged 中，您已经获得了（步骤）事件发生时的时间戳。我的目的是记住最后一个事件时间戳并在新事件进入时计算差异。这应该只在差异

https://developer.android.com/reference/android/hardware/SensorEvent#timestamp

StepCountService.java

@Override
public void onSensorChanged(SensorEvent sensorEvent) {
    if (sensorEvent.values != null) {
        float stepsSinceBoot = sensorEvent.values[0];
        boolean newSteps = stepCalculator.newStepsToday(); // Check if new steps exist
        stepCalculator.updateStepsSinceBoot(stepsSinceBoot);
        if (newSteps) {
            float activeNanoseconds = activityDurationcalculator.activeNanoseconds(sensorEvent.timestamp); // Calculate activity duration
            if (activeNanoseconds > 0) {
                databaseRepository.updateActiveInMs(activeNanoseconds);
            }
            if (isScreenOn()) {
                WidgetUpdater.updateWidget(getApplicationContext());
            }
        }
    }
}

ActivityDurationcalculator.java

public class ActivityDurationcalculator {

private long firstActiveTimestamp;
private long lastActiveTimestamp;

public float activeNanoseconds(long eventTimestamp) {
    if (firstActiveTimestamp == 0) {
        firstActiveTimestamp = eventTimestamp;
    }
    if (lastActiveTimestamp > 0 && lastActiveTimestamp != firstActiveTimestamp && eventTimestamp - lastActiveTimestamp < TimeUnit.NANOSECONDS.convert(1,TimeUnit.SECONDS)) {
        float activeNanoseconds = lastActiveTimestamp - firstActiveTimestamp;
        firstActiveTimestamp = eventTimestamp;
        lastActiveTimestamp = eventTimestamp;
        return activeNanoseconds;
    }
    lastActiveTimestamp = eventTimestamp;
    return 0;
}

}