keyhashes

  public String keyHashes(){
        PackageInfo info;
        String keyhashes = null;
        try{
            info = getPackageManager().getPackageInfo("publishme.aneury.com.publishme", PackageManager.GET_SIGNATURES);
            for(Signature signature : info.signatures){
                MessageDigest md;
                md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                keyhashes = new String(Base64.encode(md.digest(), 0));
            }

        }
        catch (Exception e){
            e.printStackTrace();
        }
        return keyhashes;

    }

this gist is a snippe for get keyhash.