android - Sensor.TYPE_STEP_DETECTOR 在 android Lollipop 上找不到

Question

我正在开发一个计步器 android 应用程序，为此我使用了 Sensor.TYPE_STEP_DETECTOR，它可以从 android KitKat 获得。 在 Nexus 5 和 Samsung Alpha 上一切正常，但后来我在 Moto G(Lollipop) 和 Nexus 4(Lollipop) 上测试了我的应用程序， 当我尝试获取 Sensor.TYPE_STEP_DETECTOR 类型的传感器时，两个设备都返回 null。

这是我的代码:

 private boolean checkSensorAvailability() {
    SensorManager sensorManager = (SensorManager) getActivity().getSystemService(Context.SENSOR_SERVICE);
    Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR);
    if(sensor==null){return false;}

    return true;
}

据我所知，此传感器需要设备中的加速度计。 这两种设备都可用。

请帮我解决这个问题。

谢谢

Answer 1

有些设备只是拒绝该(完全唤醒)功能。

The problem is power consumption. If the phone wakes up the application processor every time a step occurred, it will draw more power and could lead to poor battery life. With your phone, the manufacturer has made a decision NOT to support a "wake-up" version of the sensor that would turn the phone on when a step is detected.

https://stackoverflow.com/a/28071354/603270

作为解决方法，我建议查看 https://github.com/j4velin/Pedometer/blob/master/src/main/java/de/j4velin/pedometer/SensorListener.java

public void onSensorChanged(final SensorEvent event) {
    steps = (int) event.values[0];
    // ...
}