机器人 - 获取设备的角度使用getOrientation功能 [英] Android - Get device angle by using getOrientation function

问题描述

我是用Sensor.TYPE_ORIENTATION来确定设备，但TYPE_ORIENTATION目前的角度去precated的API版本8到SensorManager手册它是指getOrientation功能才能使用TYPE_ORIENTATION。

I was using Sensor.TYPE_ORIENTATION to determine current angle of device but TYPE_ORIENTATION is deprecated on API version 8. In SensorManager manual it refers to getOrientation function in order to use TYPE_ORIENTATION.

下面是本手册：<一href="http://developer.android.com/reference/android/hardware/SensorManager.html#getOrientation%28float%5B%5D,%20float%5B%5D%29" rel="nofollow">http://developer.android.com/reference/android/hardware/SensorManager.html#getOrientation(float[],浮动[]）

下面是我的老code：

Here is my old code :

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));
        }

    }

我真搞不清楚使用getOrientation功能，任何人都可以请告诉我一个例子，如何得到的角度？

I'm really confused about using getOrientation function, can anyone please show me an example how to get the angles?

推荐答案

现在您可以使用两个传感器（加速度计和MAGNETIC_FIELD）来获取这些信息。更多详细信息，请参见博客文章。

You now use two sensors (ACCELEROMETER and MAGNETIC_FIELD) to get that information. See 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"/>

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