Question

I’m an noob in Android and new here .

I just know that Bitmap store images pixel by pixel and don’t do any compress .

Is Drawable same as Bitmap ?
or
For the same image file , a Drawable is takes less memory then a Bitmap ？

Thanks for any response .

Answer 1

A bitmap is a Drawable. A Drawable is not necessarily a bitmap. Like all thumbs are fingers but not all fingers are thumbs.

The API dictates:

Though usually not visible to the application, Drawables may take a variety of forms:

• Bitmap: the simplest Drawable, a PNG or JPEG image.
• Nine Patch: an extension to the PNG format allows it to specify
  information about how to stretch it and place things inside of it.
• Shape: contains simple drawing commands instead of a raw bitmap,
  allowing it to resize better in some cases.
• Layers: a compound drawable, which draws multiple underlying
  drawables on top of each other.
• States: a compound drawable that selects one of a set of drawables
  based on its state.
• Levels: a compound drawable that selects one of a set of drawables
  based on its level.
• Scale: a compound drawable with a single child drawable, whose
  overall size is modified based on the current level.