How to Convert Drawable to Bitmap and Vice versa in android?

Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
d.setBounds(0, 0, w, h);
d.draw(canvas);

and Convert Bitmap to Drawable

BitmapDrawable bitmapDrawable = (BitmapDrawable)bitmap;

Drawable drawable = (Drawable)bitmapDrawable;

Bitmap bitmap = new Bitmap (...);

Drawable drawable = new BitmapDrawable(bitmap);