एंड्रॉइड दिशा सेंसर

Question

क्या यह जानना संभव है कि कैमरे के पूर्वावलोकन को देखते हुए फ़ोन किस दिशा में इंगित कर रहा है, या क्या आपको फोन को एक कंपास की तरह फ्लैट रखना है।

धन्यवाद

Answer 1

हाँ - निम्नलिखित कोड काम

public class Test extends Activity implements SensorEventListener{ 

public static float swRoll; 
public static float swPitch; 
public static float swAzimuth; 


public static SensorManager mSensorManager; 
public static Sensor accelerometer; 
public static Sensor magnetometer; 

public static float[] mAccelerometer = null; 
public static float[] mGeomagnetic = null; 


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

@Override 
public void onSensorChanged(SensorEvent event) { 
    // onSensorChanged gets called for each sensor so we have to remember the values 
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) { 
     mAccelerometer = event.values; 
    } 

    if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) { 
     mGeomagnetic = event.values; 
    } 

    if (mAccelerometer != null && mGeomagnetic != null) { 
     float R[] = new float[9]; 
     float I[] = new float[9]; 
     boolean success = SensorManager.getRotationMatrix(R, I, mAccelerometer, mGeomagnetic); 

     if (success) { 
      float orientation[] = new float[3]; 
      SensorManager.getOrientation(R, orientation); 
      // at this point, orientation contains the azimuth(direction), pitch and roll values. 
       double azimuth = 180 * orientation[0]/Math.PI; 
       double pitch = 180 * orientation[1]/Math.PI; 
       double roll = 180 * orientation[2]/Math.PI; 
     } 
    } 
} 



@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE); 
    accelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
    magnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD); 
} 

@Override 
protected void onResume() { 
    super.onResume(); 

    mSensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_GAME); 
    mSensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_GAME); 
} 

@Override 
protected void onPause() { 
    super.onPause(); 
    mSensorManager.unregisterListener(this, accelerometer); 
    mSensorManager.unregisterListener(this, magnetometer); 
} 

}