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Software Engineering Terms and Concepts learned in the context of Android Architecture Components
Related reading: Android Architecture Components slides 1-20 and/or Google codelabs referenced in the final slide Software-Engineering代写
Design patterns: Standard approaches to handling common situations/problems that arise when developing object-oriented software.
Observer design pattern: used to provide data from a background asynchronous thread to a main thread
Subject object produces data asynchronously
Example: LiveData object
Observer object registers itself with subject; method of the observer is called when subject has new data.
Example: Adroid Observer object, passed to observe() method of a LiveData object, has onChanged() method called when LiveData object has new data
Singleton: used when, for performance or sharing reasons, we wish to create only a single instance of a class
Class has a private constructor and a public static method that invokes the constructor the first time called and on subsequent calls returns a cached copy of the object created on the first call.
Example: Singleton pattern should normally be used in an Android app creating a database object.
Data Access Object (DAO): Object that provides methods for interacting with a persistent data store, such as a database.
Example: The Room architecture component provides a DAO interface for mapping Java method calls to SQL statements and mapping to Java objects any data returned by executing those statements. Software-Engineering代写
