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Bridge mode Pattern): separate the abstract part from its implementation part so that they can change independently. It is an object structured pattern, Pattern structure The builder mode includes the following roles: Take the example code of this article as a reference MotorcycleProduce - motorcycle assembly Abstract Class: establish mot ...

Eight principles of face object design Singleton mode Definition: ensure that a class has only one instance, and provide a global access point for the instance 1. Motivation In software systems, some classes must ensure that they have only one instance in the system to ensure their logical correctness and efficiency 2. Realization 2.1 ...

Single case The singleton pattern can ensure that there is only one instance of a class applying the pattern in the system. That is, a class has only one object instance. Concrete implementation Privatize the constructor so that it cannot instantiate the class object outside the class through the new keyword.A unique instantiated object ...

Recently, I saw several articles related to Jetpack MVVM, which made me want to get into this mess. I came into contact with Jetpack's set of development tools in the second half of 2017, and have since taken it as the main framework for development. During this period of use, I stepped on some pits and accumulated some experience. In order to ...

Method 1 (new project): Use the latest Canary version of Android studio, and check Use Kotlin script(.kts) for Gradle build files when creating a new project Mode 2: All items in the project will be The gradle file is changed to gradle. KTS, and modify the content syntax to kotlin script syntax (for details, please refer to demo), includin ...

Realization idea ==== By monitoring the state of the keyboard and the state of the commodity card, the translation y animation is made for the bullet screen area. The implementation idea is very simple. There are some difficulties below Implementation method of monitoring keyboard state How to get the height of the keyboard Monitor keybo ...

The beauty of design patterns by Wang Zheng Study notes Principle and implementation of memo mode Memo mode, also known as Snapshot mode, is translated into English as Memento Design Patte.Without violating the encapsulation principle, capture the internal state of an object and save the state outside the object so that the object can be rest ...

Attribute Animation: control the movement of obstacles and submarines and various dynamic effects Stop talking and look at things first! The following describes the implementation of each part of the code. Background Bar First, define the obstacle base class Bar, which is mainly responsible for drawing the bitmap resources to the specified ...

HandlerActivity.runOnUiThread()View.post(Runnable r) Let's talk about the Handler mechanism Handler is mainly composed of the following parts. Handler Handler is a message auxiliary class, which is mainly responsible for sending various message events to the message pool Sendmessage() and the handler that handles the corresponding message e ...

Responsibility chain model preface definition The objects that can handle the same kind of requests are connected into a chain, and the submitted requests are transmitted along the chain. The objects on the chain judge whether they are able to handle the request one by one. If they can, they will be processed, and if not, they will be ...