为什么 Android 湿度传感器不起作用？

Question

我创建了一个从各种传感器读取数据的应用程序。问题是在湿度和温度传感器的情况下，没有显示任何信息。其他传感器正常工作。

正常工作的光传感器代码：

public class LightFragment extends Fragment implements SensorEventListener {

TextView lightTV;
SensorManager sensorManager;
Sensor lightSensor;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_light, container, false);

    lightTV = (TextView) v.findViewById(R.id.LightValue);

    return v;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    sensorManager = (SensorManager) getActivity().getSystemService(Context.SENSOR_SERVICE);

    lightSensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);

    sensorManager.registerListener(LightFragment.this, lightSensor, SensorManager.SENSOR_DELAY_NORMAL);
}


@Override
public void onSensorChanged(SensorEvent sensorEvent) {
    Sensor sensor = sensorEvent.sensor;
    if (sensor.getType() == Sensor.TYPE_RELATIVE_HUMIDITY) {

        lightTV.setText(String.format("%.2f", +(int) sensorEvent.values[0]) + "\t\t\t" + "[lux]");

    } else {

        lightTV.setText("Light Sensor not supported on this device");
    }
}

@Override
public void onAccuracyChanged(Sensor sensor, int i) {

}

湿度传感器代码：

public class HumiFragment extends Fragment implements SensorEventListener {

TextView humiTV;
SensorManager sensorManager;
Sensor humiditySensor;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_humi, container, false);

    humiTV = (TextView) v.findViewById(R.id.HumiValue);

    return v;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    sensorManager = (SensorManager) getActivity().getSystemService(Context.SENSOR_SERVICE);

    humiditySensor = sensorManager.getDefaultSensor(Sensor.TYPE_RELATIVE_HUMIDITY);

    sensorManager.registerListener(HumiFragment.this, humiditySensor, SensorManager.SENSOR_DELAY_NORMAL);
}


@Override
public void onSensorChanged(SensorEvent sensorEvent) {
    Sensor sensor = sensorEvent.sensor;
    if (sensor.getType() == Sensor.TYPE_RELATIVE_HUMIDITY) {

        humiTV.setText(String.format("%.2f", +sensorEvent.values[0]) + "\t\t\t" + "[%]");

    } else {

        humiTV.setText("Humidity Sensor not supported on this device");
    }
}

@Override
public void onAccuracyChanged(Sensor sensor, int i) {

}

温度传感器代码：

public class TempFragment extends Fragment implements SensorEventListener {

TextView tempTV;
SensorManager sensorManager;
Sensor tempSensor;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_temp, container, false);

    tempTV = (TextView) v.findViewById(R.id.TempValue);

    return v;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    sensorManager = (SensorManager) getActivity().getSystemService(Context.SENSOR_SERVICE);

    tempSensor = sensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE);

    sensorManager.registerListener(TempFragment.this, tempSensor, SensorManager.SENSOR_DELAY_NORMAL);
}


@Override
public void onSensorChanged(SensorEvent sensorEvent) {
    Sensor sensor = sensorEvent.sensor;
    if (sensor.getType() == Sensor.TYPE_AMBIENT_TEMPERATURE) {

        tempTV.setText(String.format("%.4f", +sensorEvent.values[0]) + "\t\t\t" + "[°C]");

    } else {

        tempTV.setText("Temperature Sensor not supported on this device");
    }
}

@Override
public void onAccuracyChanged(Sensor sensor, int i) {

}

如您所见，所有代码都非常相似，但 onSensorChanged 仅适用于光传感器。我检查了三个不同设备（小米、三星、华为）上的应用程序，这两个特定的传感器在每个设备上都不起作用。 onSensorChanged 函数应该显示有关传感器缺乏支持的信息，但它不存在。两个传感器不工作且不返回任何信息的原因是什么？

Answer 1

仅有的带有湿度计（湿度传感器）和温度计的商业发布设备是 Galaxy S4 和 Note 3。一些 CAT 加固型设备带有温度计。