Drawable Mutations

Android’s drawables are extremely useful to easily build applications.

A Drawable is pluggable drawing container that is usually associated with a 

View. For instance, a BitmapDrawable is used to display images, a ShapeDrawable 

to draw shapes and gradients, etc. You can even combine them to create 

complex renderings.

Drawable star = context.getResources().getDrawable(R.drawable.star);
if (your specific condition) {
  star.setAlpha(255); // opaque
} else {
  star.setAlpha(70); // translucent
}

Here cathodal of specific sea item in the following screen is opaque remaning

are transculacent