android - 使用 getOrientation() 函数获取设备角度

Question

我使用 Sensor.TYPE_ORIENTATION 来确定设备的当前角度，但 TYPE_ORIENTATION 在 API 版本 8 上已弃用。在 SensorManager 手册中，它引用了 getOrientation() 函数以便使用 TYPE_ORIENTATION。

Here is the manual

---

这是我的旧代码:

public void onSensorChanged(SensorEvent event) {
        Log.d("debug","Sensor Changed");
        if (event.sensor.getType()==Sensor.TYPE_ORIENTATION) {
            Log.d("debug",Float.toString(event.values[0]));


            float mAzimuth = event.values[0];
            float mPitch = event.values[1];
            float mRoll = event.values[2];

            Log.d("debug","mAzimuth :"+Float.toString(mAzimuth));
            Log.d("debug","mPitch :"+Float.toString(mPitch));
            Log.d("debug","mRoll :"+Float.toString(mRoll));
        }

    }

我对使用 getOrientation() 函数真的很困惑，任何人都可以告诉我一个如何获得角度的例子吗？

Answer 1

您现在使用两个传感器(ACCELEROMETER 和 MAGNETIC_FIELD)来获取该信息。参见 blog post for more detail.

public class CompassActivity extends Activity implements SensorEventListener {

  private SensorManager mSensorManager;
  Sensor accelerometer;
  Sensor magnetometer;

  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(mCustomDrawableView);    // Register the sensor listeners
    mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
    accelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    magnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
  }

  protected void onResume() {
    super.onResume();
    mSensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_UI);
    mSensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_UI);
  }

  protected void onPause() {
    super.onPause();
    mSensorManager.unregisterListener(this);
  }

  public void onAccuracyChanged(Sensor sensor, int accuracy) {  }

  float[] mGravity;
  float[] mGeomagnetic;
  public void onSensorChanged(SensorEvent event) {
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
      mGravity = event.values;
    if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
      mGeomagnetic = event.values;
    if (mGravity != null && mGeomagnetic != null) {
      float R[] = new float[9];
      float I[] = new float[9];
      boolean success = SensorManager.getRotationMatrix(R, I, mGravity, mGeomagnetic);
      if (success) {
        float orientation[] = new float[3];
        SensorManager.getOrientation(R, orientation);
        azimut = orientation[0]; // orientation contains: azimut, pitch and roll
      }
    }
  }
}

权限:

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>