Expense Tracker

Expense Tracker is a completely offline solution. It allows you to maintain your expenses. It shows summary in a daily and weekly basis. With ability to modify and edit the daily expenses. It has a option to export the expenses by converting it to a .txt file which can be emailed to your email ID.

It requires READ and WRITE external storage permission only when export option is used. It supports runtime permissions for Android Marshmallow devices.

You can use http://jsfiddle.net/hybrid13i/JXrwM/
Similar URL's to above to convert the created JSON to Excel/CSV. Post which you can use all the excel capabilities to get desired details.

The app supports only "English" language.

It uses open source libraries like:
Sugar ORM for database operation (http://satyan.github.io/sugar/getting-started.html)
Material Date Time Picker (https://github.com/wdullaer/MaterialDateTimePicker)