MyActivity.java Source code

Introduction

Here is the source code for MyActivity.java

Source

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.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import static android.hardware.Sensor.TYPE_ACCELEROMETER;
import static android.hardware.Sensor.TYPE_MAGNETIC_FIELD;

public class MyActivity extends Activity {
    SensorManager sensorManager;
    Sensor magFieldSensor, accelerometer;
    SensorEventListener sensorListener;
    LocationListener locationListener;
    LocationManager locationManager;
    TextView orientationView, locationView;

    private float[] gravityValues = new float[3];
    private float[] geoMagnetValues = new float[3];
    private float[] orientation = new float[3];
    private float[] rotationMatrix = new float[9];

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        magFieldSensor = sensorManager.getDefaultSensor(TYPE_MAGNETIC_FIELD);
        accelerometer = sensorManager.getDefaultSensor(TYPE_ACCELEROMETER);

        sensorListener = new MySensorEventListener();

        locationListener = new MyLocationListener();
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        orientationView = (TextView) findViewById(R.id.orientationView);
        locationView = (TextView) findViewById(R.id.locationView);
    }

    @Override
    protected void onResume() {
        super.onResume();
        sensorManager.registerListener(sensorListener, magFieldSensor, SensorManager.SENSOR_DELAY_UI);
        sensorManager.registerListener(sensorListener, accelerometer, SensorManager.SENSOR_DELAY_UI);

        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
    }

    @Override
    protected void onPause() {
        super.onPause();
        sensorManager.unregisterListener(sensorListener);
        locationManager.removeUpdates(locationListener);
    }

    class MySensorEventListener implements SensorEventListener {

        @Override
        public void onSensorChanged(SensorEvent event) {

            int sensorEventType = event.sensor.getType();

            if (sensorEventType == Sensor.TYPE_ACCELEROMETER) {
                System.arraycopy(event.values, 0, gravityValues, 0, 3);

            } else if (sensorEventType == Sensor.TYPE_MAGNETIC_FIELD) {
                System.arraycopy(event.values, 0, geoMagnetValues, 0, 3);

            } else {
                return;
            }

            if (SensorManager.getRotationMatrix(rotationMatrix, null, gravityValues, geoMagnetValues)) {

                SensorManager.getOrientation(rotationMatrix, orientation);

                orientationView.setText("Yaw:   " + orientation[0] + "\n" + "Pitch: " + orientation[1] + "\n"
                        + "Roll:  " + orientation[2]);
            }
        }

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {
            if (accuracy <= 1) {
                Toast.makeText(MyActivity.this,
                        "Please shake the " + "device in a figure eight pattern to " + "improve sensor accuracy!",
                        Toast.LENGTH_LONG).show();
            }
        }
    }

    class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location location) {
            locationView.setText(
                    "Latitude:  " + location.getLatitude() + "\n" + "Longitude: " + location.getLongitude());
        }

        @Override
        public void onProviderDisabled(String provider) {
        }

        @Override
        public void onProviderEnabled(String provider) {
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
        }
    }
}