Benefits of using intent, meaning of callbacks

Benefits of using Intent:

(1) Android uses a unified intent object to encapsulate the "start intent", providing a consistent programming model that can initiate activity, Service, broadcastreceiver components

(2) An application can start a component with a certain feature, without coupling to a specific component, using a high-level decoupling

(3) is an important medium between application component communication, carrying bundle object data with intent

Meaning of the callback:

It is common to implement an application architecture with a common nature, and at a particular point, a piece of business-related code is needed.

The common program architecture cannot implement this code, then the program schema will leave a "null" ("callback" called this "Empty" method).

For Java, this "empty" can exist in two forms

(1) The interface form, the implementation of the interface will implement the method of the interface

(2) In the form of activity, a specific point on the method has been defined, such as OnCreate, Onactivityresult and other methods

Developers rewrite these methods, and the general architecture will call back on these methods to do business-related processing.

Benefits of using intent, meaning of callbacks