Try something like this in you onStart to load an image and draw that image in your onPaint
public static File imageFile = new File(System.getProperty("user.home") + File.separator + "OSBot" + File.separator + "Data" + File.separator + "image.png");
try {
BufferedImage image = ImageIO.read(imageFile);
} catch (IOException e) {
e.printStackTrace();
}