Implementing a Shopping Cart
I am making an Android app where I am implementing a Shopping Cart. When the user selects an item, it is added to his/her shopping cart/bag in the app. Once he/she adds an item, he's presented with the menu again, where he can add more items. Now I want to know how do I save these items during the buying process. I mean the items that are being saved in the bag, how do I save them in my android app? Shall I use the Android SQLite database? or use putextra/getextra and navigate through activities? or shall I use Global Variables (something like subclassing the Application class)?
Or is there any other better way to implement such a thing? The details that I need to show in my bag are: the name of the product, its price, quantity and a few other attributes/options related to the product.
Answer
Passing the shopping cart items around in extras or using an Application class is too volatile. If your app crashes, the user exits the app, android decides to close your app, .. basically anything that closes your app.. The user will lose the contents of their shopping cart.
SQLite would be a good option for storing data like this. You could also store the shopping cart in an xml file on the user's phone.