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智能手机中的压力传感器

发布于 2024-11-16 02:32:55 字数 121 浏览 4 评论 0原文

任何人都可以帮助我了解智能手机中的压力传感器。我猜测 TYPE_PRESSURE 用于查询大气压力。目前尚不清楚这些值存储在哪里。它是否存储在 SensorManager.values 字段中？该传感器的其他可能用途是什么？

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上课铃就是安魂曲 2024-11-23 02:32:55

它的主要用途是告诉海拔变化，但我确信有一些智能方法可以使用该传感器来执行多项其他任务。

至于获取变量，我很确定它的工作原理与其他 Android 传感器一样。您注册一个传感器事件侦听器，然后在更改的传感器中从 event.values.clone() 获取值，例如。

switch (event.sensor.getType())
        {
        case Sensor.TYPE_PRESSURE:
            m_fPressureVal = event.values.clone();
            break;
                     }

Its main uses would be to tell elevation changes, however i am sure that there are some intelligent ways to use this sensor to do multiple other tasks.

As for getting the variables out I am pretty sure it works as the other android sensors do. You register a sensor event listener and then in your on sensor changed you get the values out of event.values.clone() eg.

switch (event.sensor.getType())
        {
        case Sensor.TYPE_PRESSURE:
            m_fPressureVal = event.values.clone();
            break;
                     }

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静赏你的温柔 2024-11-23 02:32:55

压力传感器给出环境气压，单位为 hPa 或 mbar。它的值存储在 event.values[0] 中。在 Android 开发中心查看有关环境传感器的参考资料。

这里有一个如何使用它的示例：

 public class SensorActivity extends Activity implements SensorEventListener {
 private SensorManager mSensorManager;
 private Sensor mPressure;

 @Override
 public final void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // Get an instance of the sensor service, and use that to get an instance of
    // a particular sensor.
    mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mPressure = mSensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);
  }

  @Override
  public final void onAccuracyChanged(Sensor sensor, int accuracy) {
    // Do something here if sensor accuracy changes.
  }

  @Override
  public final void onSensorChanged(SensorEvent event) {
    float millibars_of_pressure = event.values[0];
    // Do something with this sensor data.
  }

  @Override
  protected void onResume() {
    // Register a listener for the sensor.
    super.onResume();
    mSensorManager.registerListener(this, mPressure, SensorManager.SENSOR_DELAY_NORMAL);
  }

  @Override
  protected void onPause() {
    // Be sure to unregister the sensor when the activity pauses.
    super.onPause();
    mSensorManager.unregisterListener(this);
  }
}

The pressure sensor gives the ambient air pressure in hPa or mbar. Its values are stored in the event.values[0]. Check the reference about environment sensors in de Android Dev Centre.

Here you have an example of how to use it:

 public class SensorActivity extends Activity implements SensorEventListener {
 private SensorManager mSensorManager;
 private Sensor mPressure;

 @Override
 public final void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // Get an instance of the sensor service, and use that to get an instance of
    // a particular sensor.
    mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mPressure = mSensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);
  }

  @Override
  public final void onAccuracyChanged(Sensor sensor, int accuracy) {
    // Do something here if sensor accuracy changes.
  }

  @Override
  public final void onSensorChanged(SensorEvent event) {
    float millibars_of_pressure = event.values[0];
    // Do something with this sensor data.
  }

  @Override
  protected void onResume() {
    // Register a listener for the sensor.
    super.onResume();
    mSensorManager.registerListener(this, mPressure, SensorManager.SENSOR_DELAY_NORMAL);
  }

  @Override
  protected void onPause() {
    // Be sure to unregister the sensor when the activity pauses.
    super.onPause();
    mSensorManager.unregisterListener(this);
  }
}

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