Maze maze;
private SensorManager sensorManager;
private Sensor accelerometer;
public static int sensorX;
public static int sensorY;

public void onCreate(Bundle bundle) {
    super.onCreate(bundle);

    Intent intent = getIntent();
    Bundle extras = intent.getExtras();

    // start of sensor
    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    accelerometer =
    sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    lastUpdate = System.currentTimeMillis();
    // end of sensor

    setContentView(gameView);
}


// start sensor activity
@Override
public void onAccuracyChanged(Sensor sensor, int i) {
    // Not in use
}

@Override
public void onSensorChanged(SensorEvent event) {

    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER ) {

        sensorX -= (int) event.values[0];   // values of x-axis
        sensorY += (int) event.values[1];   // values of y-axis

    }
}

// maze walls are drawn
@Override
protected void onDraw(Canvas canvas) {

    //fill in the background
    canvas.drawRect(0, 0, width, height, background);

    boolean[][] hLines = maze.getHorizontalLines();
    boolean[][] vLines = maze.getVerticalLines();

    //iterate over the boolean arrays to draw walls
    for(int i = 0; i < mazeSizeX; i++) {
        for(int j = 0; j < mazeSizeY; j++){

            float x = j * totalCellWidth;
            float y = i * totalCellHeight;

            if(j < mazeSizeX - 1  && vLines[i][j]) { // draw vertical line

                canvas.drawLine(x + (cellWidth),     //start X
                                y,                   //start Y
                                x + (cellWidth) ,    //stop X
                                y + (cellHeight),    //stop Y
                                line);
            }

            if(i < mazeSizeY - 1  && hLines[i][j]) { //draw horizontal line

                canvas.drawLine(x,                          //startX
                                y + cellHeight,             //startY
                                x + cellWidth,              //stopX
                                y + cellHeight,             //stopY
                                line);
            }

        }
    }

    float ballX;
    float ballY;
    final int width = 10;
    final int height = 10;

    ballX = (Game.sensorX)  + (cellWidth/4);
    ballY = (Game.sensorY)  + (cellWidth/4);

    bitmapBall = BitmapFactory.decodeResource(getResources(),
    R.drawable.player);    // image of player

    // draw player at X and Y position
    canvas.drawBitmap (bitmapBall,
                       ballX *2 ,          // left of image is drawn
                       ballY * 2 ,         // top of image is drawn
                       paint);

   }