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What is the different between them?
where and why we need to convert from one type to another?
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A Bitmap is a representation of a bitmap image (something like java. awt. Image). A Drawable is an abstraction of "something that can be drawn".
Displays image resources, for example Bitmap or Drawable resources. ImageView is also commonly used to apply tints to an image and handle image scaling.
android.graphics.drawable.BitmapDrawable. A Drawable that wraps a bitmap and can be tiled, stretched, or aligned. You can create a BitmapDrawable from a file path, an input stream, through XML inflation, or from a Bitmap object. It can be defined in an XML file with the <bitmap> element.
ImageView class is used to display any kind of image resource in the android application either it can be android. graphics. Bitmap or android. graphics.
For a difference between bitmap and drawable see here
ImageView is something like img tag in HTML. It is the View that displays an image.
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