import android.app.Activity;

 import android.content.Context;

 import android.hardware.Sensor;

 import android.hardware.SensorEvent;

 import android.hardware.SensorEventListener;

 import android.hardware.SensorManager;

 import android.os.Bundle;

 public class MainActivity extends Activity implements SensorEventListener{

      private SensorManager mSensorManager;

       private Sensor mOrientation;

       @Override

       public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

         mOrientation = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);

       }

       @Override

       public void onAccuracyChanged(Sensor sensor, int accuracy) {

         // Do something here if sensor accuracy changes.

         // You must implement this callback in your code.

       }

       @Override

       protected void onResume() {

         super.onResume();

         mSensorManager.registerListener(this, mOrientation, SensorManager.SENSOR_DELAY_NORMAL);

       }

       @Override

       protected void onPause() {

         super.onPause();

         mSensorManager.unregisterListener(this);

       }

       @Override

       public void onSensorChanged(SensorEvent event) {

         float azimuth_angle = event.values[0];

         float pitch_angle = event.values[1];

         float roll_angle = event.values[2];

         System.out.println("azimuth--->" + azimuth_angle);

         System.out.println("pitch_angle--->" + pitch_angle);

         System.out.println("roll_angle--->" + roll_angle);

         // Do something with these orientation angles.

       }

 }