• The compass image rotates with the phone
• The content of textView indicates degrees
• When pressed, the phone speaks one of the eight directions it facing

        ImageView imageview = (ImageView) findViewById(R.id.imageView);

        // imageview click callback
        imageview.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                TextView textview = (TextView) findViewById(R.id.textView);
                textview.setText("Image is clicked");
            }
        });

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.floatingActionButton);
	fab.setOnClickListener(new View.OnClickListener() {
    	@Override
        public void onClick(View view) {
            rotate();
        }
    });
		
    // my function for image rotation
    // use a fixed value (45 degrees) here for later expansion
    private void rotate() {

		... //// As assignment
    }

public class MainActivity extends AppCompatActivity implements SensorEventListener {
	SensorManager sensorManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
		...
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
		...
	}
	
    @Override
    protected void onResume() {
        super.onResume();

        //// for the system's orientation sensor registered listeners
    }

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

        //// to stop the listener and save battery
    }

    @Override
    public void onSensorChanged(SensorEvent event) {

        //// get the angle around the z-axis rotated and update textview
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        //// not in use, NO CODE HERE
    }

public class MainActivity extends AppCompatActivity implements SensorEventListener, TextToSpeech.OnInitListener {
	TextToSpeech tts;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
		...
        tts = new TextToSpeech(this, this);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.floatingActionButton);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                speakOut();
            }
        });
		
    @Override
    public void onDestroy() {
        //// Don't forget to shutdown tts!

        super.onDestroy();
    }

    @Override
    public void onInit(int status) {
        if (status == TextToSpeech.SUCCESS) {
            int result = tts.setLanguage(Locale.US);

            if (result == TextToSpeech.LANG_MISSING_DATA
                    || result == TextToSpeech.LANG_NOT_SUPPORTED) {
            } else {
            }

        } else {
        }
    }

    private void speakOut() {
        String text = "You are facing ";
        
		... //// As assignment		
    }		

    private String direction;
    private String dir[] = {"North","Northeast","East","Southeast","South","Southwest","West","Northwest","North"};
	
	//// speaks the direction using degrees	

• speak(text, TextToSpeech.QUEUE_FLUSH, null)

  String text = editText.getText().toString();
  tts.speak(text, TextToSpeech.QUEUE_FLUSH, null);	
  

• Not a big issue, here
• Bigger issue -- Sensor.TYPE_ORIENTATION, here

  mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),
                  SensorManager.SENSOR_DELAY_GAME);
  

• One approach uses Kotlin