Welp it's pretty simple acutally. All you need is an Image, which you get from a URL.
You need to create 2 instance variables:
Image paintImg;
URL paintUrl;
then in your onStart do the following:
try {
paintUrl = new URL("yourPaint.com");
} catch (MalformedURLException e1) {
log("Problem loading URL.");
e1.printStackTrace();
}
try {
paintImg = ImageIO.read(paintUrl);
} catch (IOException e1) {
log("Problem loading image from URL.");
e1.printStackTrace();
}
Finally, paint it in your onPaint().
g.drawImage(paintImg, x, y, width,height,this);