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1. activity_main.xml Add the LinearLayout of the horizontal layout in the LinearLayout of the vertical layout, and then add EditText product name, EditText amount, ImageView add button <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://sch ...

Apk error in Android N installation android.os.FileUriExposedException: file:///storage/emulated/0/download/1558506119385taiheApp.apk exposed beyond app through Intent.getData() Because Android 7.0 added "private directory restricted access" "Restricted access to private directory" means that in Android 7.0, in order to ...

▶ Log4j2 performance https://logging.apache.org/log4j/2.x/performance.html ▶ Spring Boot dependency and configuration Maven dependence <!-- web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclu ...

Data table structure design unique index ensures data uniqueness CREATE TABLE `mmall_user` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'User table id', `username` varchar(50) NOT NULL COMMENT 'User name', `password` varchar(50) NOT NULL COMMENT 'User password, MD5 encryption', `email` varchar(50) DEFAULT NULL, `phone` varchar(20) D ...

Mybatis reverse generation brief introduction Reverse engineering literally means reverse generation engineering. Like hibernate, mybatis also has its own reverse engineering tools. I haven't done the reverse generation of hibernate When using reverse engineering, it should be noted that the relationship between tables cannot be mapped In othe ...

Article directory I. positioning introduction Two, code 1. Instantiate LocationManager 2. Processing runtime permissions 3. Start request location 4. Positioning monitor 5. Update positioning III. Demo download I. positioning introduction You can also use Android without using the third-party map SDK Its own ...

Log4j should be more familiar to you. Log4j2 is a relatively large upgrade of log4j. The bottom layer uses disruptor rewriting to optimize the asynchronous output log, which greatly improves the performance. The author has made performance comparison among log4j, logback and log4j2, and log4j2 does show absolute advantages. Not much to say, the ...

Shiro is a common security authentication framework, which is simple and practical. There are two ways to integrate Shiro in Spring Boot: Implement the configuration in traditional SSM+Shiro in Java Use Shiro's official automated configuration dependency This article chooses the second practical way to integrate, but ...

Change AOP in XML mode to annotation mode. Step 1: annotation configuration business class Annotate the ProductService class with @ Component("s") package com.how2java.service; import org.springframework.stereotype.Component; @Component("s") public class ProductService { public ...

Mysql should also be installed on the MyCat host. I. read write separation configuration: 1. Upload or download: wget http://dl.mycat.io/1.6.7.1/Mycat-server-1.6.7.1-release-20190627191042-linux.tar.gz 2. Decompress: tar xzvf /srv/ftp/Mycat-server-1.6.7.1-release-20190627191042-linux.tar.gz -C /usr/local/ 3. Open the configuration ...