How to check if a Bitmap is empty (blank) on Android

Question

How can I check if a Bitmap object is completely blank, i.e. all its pixels are transparent, without a x-y loop on every pixel?

Answer 1

You can check your Bitmap instance (in the example myBitmap) against an empty one with:

Bitmap emptyBitmap = Bitmap.createBitmap(myBitmap.getWidth(), myBitmap.getHeight(), myBitmap.getConfig()); if (myBitmap.sameAs(emptyBitmap)) {     // myBitmap is empty/blank } 

Answer 2

This is not an efficient way to solve the problem but it does its purpose cause I didn't find a solution even in docs

see while the Bitmap is null it's width or height can't be fetched and it raises a crash so here is may solve your problem

       try{                    int check=bitmap.getWidth();                // the bitmap is valid & not null or empty                  }catch (Exception w){                   // the bitmap, not valid eighter null or empty                 } 

hope this helps :)