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Github address (full Demo, welcome to download) https://github.com/ganchuanpu/ItemGroup Design sketch   attrs.xml 1 <?xml version="1.0" encoding="utf-8"?> 2 <resources> 3 <declare-styleable name="ItemGroup"> 4 <! -- text of title -- > 5 <attr name="title" format="string" /> 6 <! -- font size ...

openfire send message plug-in (description and source code) Implementation function: Send messages to users directly if they are online, and save them as offline messages when they are not online Send a message to a group. If it is online, it will be sent directly. If it is not online, it will be saved as an offline ...

1.ViewStub inheritance relationship public final class ViewStub extends View java.lang.Object ↳ android.view.View ↳ android.view.ViewStub The definition of ViewStub on the official website: a ViewStub is an invisible, zero sized view that can be used to lazily inflate layout resources at runtime. This mea ...

Now third-party logins are very common, such as QQ, Weibo and WeChat. Today we are going to implement how to access QQ to login into our project.To use QQ login, we need to register an account with Tencent Open Platform to get the developer qualification address: http://open.qq ...

Original link: http://www.yiidian.com/mybatis/one-to-one.html 1 What are one-to-one, one-to-many mappings? Take users and orders for example, One-to-one: An order belongs to only one user==>The order is one-to-one with the user One-to-many: A user can have multiple orders==>A user is one-to-many with an order Note: In MyBatis, if you want ...

configuration file There are two configuration file formats for SpringBoot. You can choose one of them. yaml is officially recommended: Format of application.properties key=value application.yaml key: value format Profile location SpringBoot loads the main configuration file from all four locations; complementary configuration. Priority is fr ...

@2020.3.18  1. Write function, the user passes in the modified file name, and the content to be modified, executes the function, and completes the batch modification operation def modify_file(filename,old,new): import os with open(filename,'r',encoding='utf-8') as read_f,\ open('.bak.swap','w',encoding='utf-8') as write_f ...

Article directory encapsulation reflex Dynamic import module Class built in attr attribute Packaging and authorization This article is still the object-oriented content, mainly analyzes the following three methods of object-oriented programming: encapsulation, reflection, dynamic import module, cla ...

1. Introduction to ContentProvider The client operation contentResolver and ContentProvider are the same Auxiliary operation class ContentUris of Uri 2.ContentProvider database operation Project class structure 1. Create MetaData 2. Define a subclass of SQLiteOpenHelper class to create and delete me ...

1. What is string built-in function As long as a string is created, built-in functions (some functions prepared by the system) can be called by default. 2. Case related The main functions are capitalization(), title(), upper(), lower(), etc. capitalize(): capitalize the first letter of the string ...