Android hide image from user gallery

i'm using the following phonegap build plugin:

com.chanthu.evri.gcs-file-transfer version="1.0.0"

to download images on devices. The download is ok but the images are visible in user's standard gallery myApp folder. How can i save the images without creating such a gallery ?

The path I use to save them is:

cdvfile://localhost/persistent/myApp/

The path on the android device become:

/storage/sdcard0/myApp/