When it comes to building mobile applications, there is one special case that is different to the mobile application from today's desktop applications—offline mode or the flight mode . However, this offline mode has been there on desktop applications for some time, where we had intermittent or slow network connections. However, they are now more common to the mobile world. This mode means the mobile is not on the network and does not have access to the WLAN or GPRS data connection.
There are several cases where it is necessary for an application to have an offline presence. For example, imagine that you are field maintenance staff and you work in areas where there is no network coverage. However, you need to carry the list of customers, their orders, and the order details containing the list of products the customer has ordered, their quantity, prices, and so on. As field maintenance staff, you are expected to fulfill the order, collect the payment, and issue a receipt to customers...