我怎样才能获得离子3中的所有音频文件？

Question

我想创建一个音频播放器。我需要列出所有电话簿中的所有音频文件

screen2 = Array.new(25) { Array.new(25, 0) }
# at this point, screen2 is an array of arrays, with values of 0
for i in 0...25 do
  # this conditional changes the elements in the outer array to be strings
  # not arrays!
  if i == 0 || i == 24
    screen2[i] = '$-----------------------$'
  else
    screen2[i] = '|                       |'
  end
end
# here, screen2 is an array of strings, not an array of arrays. This
# allows my above explanation to become relevant.