Getting NullPointer exception with File.listfiles()

Question

So I have 3 folders in my Android Gallery. I am trying to read the files of these folders into File arrays and then, from there, translate the image source into actual Ima

Answer 1

According to the documentation for File.listFiles(), it will return null if the File is not a directory.

There are three (very similar) alternatives as to why this my be...

1. The String returned by (for example)... Environment.getExternalStorageDirectory().getPath() + "/DressIt Tops/" doesn't represent a valid directory (the same may apply for ..."/DressIt Bottoms/" and/or ..."/DressIt Shoes/").
2. The Strings returned ARE valid paths BUT one or other of them is a file and NOT a directory.
3. The directories DO exist BUT you have a typo with the directory name - remember the filesystem is case-sensitive. If you've created the "/DressIt Tops/" directory as ""/dressIt tops/" (for example), it won't be found as a valid path.

One more thing - never assume any path to anywhere on the Android filesystem - log what Environment.getExternalStorageDirectory().getPath() actually returns, check it's where you created the directories and also check you have everything in the correct case.