Java – Gets the file name of only files with the extension .txt from the Assets folder

Currently I have this code:

ArrayList<String> items = new ArrayList<String>();
                AssetManager assetManager = getApplicationContext().getAssets();
                try {
                     items.addAll(Arrays.asList(assetManager.list("")));
                } catch (IOException e) {
                     TODO Auto-generated catch block
                    e.printStackTrace();
                }

This gives me an array list of all filenames in the Assets folder.
But I need to filter this so that arraylist only contains the filenames of files with .txt extensions, and then remove .txt from each project name.

So the current code will result:

test.txt
pi.txt
sounds
hippo.png
square.xml
seven.txt

But when I need it, the contents of the arraylist are:

test 
pi 
seven