Save And Load From Sdcard Shows Empty File

I have a layout where I have an Edit Text field where I enter my data. I have 2 buttons.Save and Plot. When I press save I want to save the data (in xls format) from edittext field

Solution 1:

Read this documentation here have more information about save data to external storage and read it is:

Saving and Reading file from External storage

Solution 2:

Ok, I found this and works fine!