android - 如何减慢android传感器事件

Question

我正在尝试检测 Android 设备的运动并从设备获取线性加速度值。我正在使用 SensorEvent 的时间戳并将其与上次更新时间进行比较以确定是否记录传感器值。但它没有任何效果。为什么它不起作用？

@Override
public void onSensorChanged(SensorEvent event) {
    if(event.sensor.getType() == Sensor.TYPE_LINEAR_ACCELERATION) {

            int value = (int) event.values[0];
            if(actualTime - lastUpdate > 5000) {
                Log.d(TAG, "" + value);
                lastUpdate = actualTime;
            }

Answer 1

如果要更改访问传感器的速率，可以在 registerListener 中指定频率，如官方文档所述。

@Override
protected void onResume() {
    super.onResume();
    mSensorManager.registerListener(this, mLight,SensorManager.SENSOR_DELAY_NORMAL);
}

In this example, the default data delay (SENSOR_DELAY_NORMAL) is specified when the registerListener() method is invoked. The data delay (or sampling rate) controls the interval at which sensor events are sent to your application via the onSensorChanged() callback method. The default data delay is suitable for monitoring typical screen orientation changes and uses a delay of 200,000 microseconds. You can specify other data delays, such as SENSOR_DELAY_GAME (20,000 microsecond delay), SENSOR_DELAY_UI (60,000 microsecond delay), or SENSOR_DELAY_FASTEST (0 microsecond delay). As of Android 3.0 (API Level 11) you can also specify the delay as an absolute value (in microseconds).

绝对有可能放慢速度:)