public class PaintObject extends View
{
    Paint paint;
    public int x;
    public int y;

    public PaintObject(Context context, int dx, int dy)
    {
        super(context);

        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(getResources().getColor(R.color.blue));

        this.x = dx;
        this.y = dy;

        paints.add(this);
    }

    public void update()
    {
        x += 5;
        y += 5;
    }

    @Override
    public void onDraw(Canvas canvas)
    {
        if (!paints.contains(this))
            return;

        canvas.drawRect(x, y, x + 20, y + 20, paint);

        invalidate();
    }

for (PaintObject p : paints)
{
    if (p.x > screenWidth || p.y > screenHeight)
    {
        paints.remove(p);
        p = null; // compiler says it's never used, but I'm making this for sure so GC will collect it
    }
    else
        p.update();
}

layout.addView(new PaintObject (this, 10, 10)); //layout is current layout; xy are randomized in reality