What are the common design patterns or frameworks for Android? I m talking about the most commonly u

There is no framework within Android for the time being.

It's good to do it yourself according to the principle of MVC layering, and some open sources like Facebook also have a lot of open source libraries. You can think about using it.

Builder mode: For example.

Adapter modes: such as gridview, listview, and adapter.

Command mode: For example.

Enjoy meta mode: For example:

Singleton pattern: For example.

Observer mode: e.g. ContentObserver.

Here are some of the most frequently used design patterns and examples.

There are now only 2 of the most popular frameworks.

Struts+Spring+Hibernate(SSH)Struts+Spring+Ibatis(SSI) may replace Struts in the future

Webwork struts easyjweb tapestry go here and talk about it in detail.

There is no framework that solves all problems, and if that's the case, it's too simple to build a computer, and the framework is a software that can be changed at will. It's also useful to learn some basic design patterns.

It is mainly a framework combining struts1, struts2, and spring and hibernate, referred to as ssh

Out of SSH and ibatis (similar to hibernate), finance (banks) generally use EJB is very powerful, more difficult to learn.

I suggest you buy a book called "The Zen of Design Patterns" that talks a lot about it.

In fact, the design pattern is not talked about, and it is not that kind of technical framework.

It is a layer in the software development architecture, which is the data access layer.

The DAO layer is responsible for accessing and operating the database.

Teach you some development experience, how fine the granularity of the dao should be, that is, accurate to the table, that is, the conventional practice is a dao class corresponding to a table, which contains some methods for adding, deleting, modifying, and querying, and each method has only one behavior, for example, you can't write a query behavior in a method and write a delete behavior at the same time, which is a taboo in the development of dao.

Then the service or manage layer (also called the business layer or application layer) to combine and call the methods in the DAO layer. This layer is responsible for transactions and business portfolios.

Completely different. The DAO is the design pattern for J2EE, and Struts is a framework.

Unlike Struts, Struts is a program development framework that evolved from the MVC model.

The DAO (Database Access Object) uses the Microsoft Jet database engine to access the database.

Microsoft Jet provides data engines for products like Access and Visual Basic.

It's very easy to understand and it's free!

Great for beginners!