AndroidStudio: add virtual folder in gradle

Question

I use the build.gradle file to collect several folders on my computer in my app's asset folder:

sourceSets {
    main {
        assets.srcDirs = ['../someFolder/', 'src/main/assets']
    }
}

This leads to my asset folder having the files of someFolder and the "original" asset folder:

//The "physical" folders

../someFolder
  |- file1.txt
  |- file2.txt
  |- file3.txt
src/main/assets
  |- asset1.txt

//...become this:

assets
  |- file1.txt
  |- file2.txt
  |- file3.txt
  |- asset1.txt 

How can I redirect the paths in gradle so that my asset folder contains a folder "someFolder" with all the files from someFolder, e.g:

assets
  |- someFolder
  |--- file1.txt
  |--- file2.txt
  |--- file3.txt
  |- asset1.txt 

Answer 1

1) Create folder inside of the project as your external assets ./extAssets

sourceSets.main.assets.srcDirs = ['src/main/assets', './extAssets']

2) Link all your external directories inside this folder

$ cd extAssets/
$ ln -s ../../someFolder/ someFolder

As result you will see

assets
  |- someFolder
  |--- file1.txt
  |--- file2.txt
  |--- file3.txt
  |- asset1.txt 

without any file copying