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First, let's take a look at the effect, first update 5 data items from top to bottom, then slide to the bottom and pull up to add 5 data items from the bottom to the top: We use a third-party library, so we first add it in the gradle configuration file: implementation 'com.android.support:recyclerview-v7:25.3.1' imp ...

Advanced controls Advanced control steps 3.1 obtaining data 3.2 create adapter Array adapter Simple adapter 3.3 binding adapter Differences between high-level controls and low-level controls: **Use adapter or not** 1: Auto prompt box 1.AutoCompleteTextView Case 1: automatic completion of data (array ...

@RequiresPermissions("sys:role:edit") @RequestMapping(value = "save") public String save(Role role, Model model, RedirectAttributes redirectAttributes) { if(!UserUtils.getUser().isAdmin()&&role.getSysData().equals(Global.YES)){ addMessage(redirectAttributes, "Unauthorized operation, only super adminis ...

Brief introduction to life cycle method startService() Role: start Service service After manually calling startService(), internal methods are automatically called: onCreate(), onStartCommand() If a service is started multiple times by startService, onCreate() will only call once onStartCommand() calls = startService() calls ...

Spring does not guarantee thread safety of bean s.The bean s in the default spring container are singleton. When there is a race condition in a single case, there is a thread safety problem. As the following example Counting class package constxiong.interview.threadsafe; /** * Counting class * @author ConstXiong * @date 2019-07-16 1 ...

Preface Before you begin the body, explain how the Dao interface corresponds to the SQL in the XML file. At the end of a sentence, mybatis parses these xml files, establishes a relationship with Dao through the namespace ins id e the xml file, and then associates each sql in the xml with an interface in dao. The question then arises:'If I have ...

1. Why do you need to design a status button OnePomodoro There's a button in the app to control the start/stop of the timer. It should have been a button with two states: Started and Stopped. But I've done too many things like StateButton and ProgressButton on WPF and UWP before and I'm tired of this control, so I'm just using two buttons in O ...

I. Amoeba It can realize load balancing Read / write separation , high availability, etc. 1.1 installation of JDK (1) Upload JDK (2) Unzip [root@localhost java]# tar -xvf jdk-8u51-linux-x64.tar.gz  (3) Modify system environment variables [root@localhost java]# vim /etc/profile (4) Load JDK configuration [root@lo ...

1. Configuration in xml bean declaration and registration < bean > node register bean Factory bean parameter of < bean > node refers to factory bean, and factory method parameter specifies factory method   bean injection < property > nodes are injected in set mode < constructor Arg > node injection with construc ...

Android can print multiple APP packages in the same set of code and install and run on the same mobile phone Android can print multiple APP packages in the same set of code and = = install and run on the same phone = =, and = = APP name and desktop icon are also different== Give different package names to the same set of code ...