device rotation sensor android examples

Example: device rotation sensor android examples

MainActivity.java
package com.authorwjf.pitchandroll;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;

public class MainActivity extends Activity implements SensorEventListener {

	private SensorManager mSensorManager;
	private Sensor mRotationSensor;
	
	private static final int SENSOR_DELAY = 500 * 1000; // 500ms
	private static final int FROM_RADS_TO_DEGS = -57;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		try {
			mSensorManager = (SensorManager) getSystemService(Activity.SENSOR_SERVICE);
			mRotationSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ROTATION_VECTOR);
			mSensorManager.registerListener(this, mRotationSensor, SENSOR_DELAY);
		} catch (Exception e) {
			Toast.makeText(this, "Hardware compatibility issue", Toast.LENGTH_LONG).show();
		}
	}

	@Override
	public void onAccuracyChanged(Sensor sensor, int accuracy) {
		// TODO Auto-generated method stub
	}

	@Override
	public void onSensorChanged(SensorEvent event) {
		if (event.sensor == mRotationSensor) {
	    	if (event.values.length > 4) {
	    		float[] truncatedRotationVector = new float[4];
	    	    System.arraycopy(event.values, 0, truncatedRotationVector, 0, 4);
	    	    update(truncatedRotationVector);
	    	} else {
	    		 update(event.values);
	    	}
	    }
	}
	
	private void update(float[] vectors) {
		float[] rotationMatrix = new float[9];
	    SensorManager.getRotationMatrixFromVector(rotationMatrix, vectors);
	    int worldAxisX = SensorManager.AXIS_X;
	    int worldAxisZ = SensorManager.AXIS_Z;
	    float[] adjustedRotationMatrix = new float[9];
	    SensorManager.remapCoordinateSystem(rotationMatrix, worldAxisX, worldAxisZ, adjustedRotationMatrix);
	    float[] orientation = new float[3];
	    SensorManager.getOrientation(adjustedRotationMatrix, orientation);
	    float pitch = orientation[1] * FROM_RADS_TO_DEGS;
	    float roll = orientation[2] * FROM_RADS_TO_DEGS;
	    ((TextView)findViewById(R.id.pitch)).setText("Pitch: "+pitch);
	    ((TextView)findViewById(R.id.roll)).setText("Roll: "+roll);
	}

}