Add writeJSON()

Signed-off-by: Simone <hello@simonewebdesign.it>
Update writeJSON()

Signed-off-by: Simone <hello@simonewebdesign.it>
Rename writeJSON() to getJSON()

Signed-off-by: Simone <hello@simonewebdesign.it>
Change FILENAME to list.json

Signed-off-by: Simone <hello@simonewebdesign.it>
Add throws declaration

Signed-off-by: Simone <hello@simonewebdesign.it>
Implementing readJSON()

Signed-off-by: Simone <hello@simonewebdesign.it>
Delete readJsonData()

Signed-off-by: Simone <hello@simonewebdesign.it>
Delete persistJsonDataArray()

Signed-off-by: Simone <hello@simonewebdesign.it>
Implement restoreDataFromJSON(String json)

Signed-off-by: Simone <hello@simonewebdesign.it>
Delete package com.example.todolist.util

Signed-off-by: Simone <hello@simonewebdesign.it>
remove old import statements

Signed-off-by: Simone <hello@simonewebdesign.it>
Remove unnecessary import statements

Signed-off-by: Simone <hello@simonewebdesign.it>
Restore data from internal storage

Signed-off-by: Simone <hello@simonewebdesign.it>
onDestroy() Save data

Signed-off-by: Simone <hello@simonewebdesign.it>
Various edits

Refactoring, bug fixing etc.. See code.

Signed-off-by: Simone <hello@simonewebdesign.it>
Add saveData()

Signed-off-by: Simone <hello@simonewebdesign.it>
Fix bug

Signed-off-by: Simone <hello@simonewebdesign.it>
Refactoring and cleaning; preparing for merge

Signed-off-by: Simone <hello@simonewebdesign.it>