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Article directory I. concept 1, understand 2. Application scenario 2, Database operations 1. Create database 2. Data operation (add, delete, modify and query) 2.1 add statement Method 1: Method 2: 2.2 delete statement 2.3 UPDATE statement 2.4 query statement 3. Import of mobile database file ...

Preface I don't know if you've ever met it. Sometimes the system starts abnormally, and it will directly enter the error interface of a robot. I have encountered that after OTA upgrade, it will restart automatically after startup and enter the robot error interface. It's found that there is a process ...

This paper is based on the official video playback plugin for encapsulation https://github.com/flutter/plugins/tree/master/packages/video_player/video_player In the daily development, it is inevitable to meet the needs of video development; with the increasingly active technology of Flutter, there wil ...

Preface In the process of Activity interaction, data must be transferred between two activities. You can start a new Activity by using the startActivity() or startActivityForResult() method, depending on whether your Activity wants to get the return result from the new Activity that is about to start. ...

This article was reproduced from the sheldon_blogs blog at https://www.cnblogs.com/blogs-of-lxl/p/10651611.html This article is for study and research purposes only. Please attach the original author's name and web address if you want to reproduce it 1. Treble mechanism on Android O In Android O, w ...

Preface I'm an Android Developer. I'll just introduce the hybrid development of Android and Flutter here. There are many related articles on the Internet about the mixed development of native and Flutter, which are basically done by using the methods of FlutterView and FlutterFragment. However, in th ...

February 5th 1. target Master the layout manager of Android UI design 2. Learning notes 2.1 UI components TextView Botton RadioBotton EditView ImageView RecyclerView 2.2 layout manager 2.2.1 linear layout Most common attributes attribute attribute attribute android:id android:layo ...

Let's talk about what I mean by waterfall layout here: There are N textviews, or other views, arranged one by one. Unlike LinearLayout, you can wrap lines Take a look at the picture. Otherwise, it's unexpected. The picture is as follows: Don't think about it. There must be no existing View to use, because you don't know h ...

First of all, add the following dependencies to build.gradle in app, banner is the frame of carousel chart, glide is the frame of picture loading. implementation 'com.youth.banner:banner:1.4.9' implementation 'com.github.bumptech.glide:glide:4.7.1' annotationProcessor 'com.github.bumptech.glide:compiler ...

Multi level expansion menu based on Bootstrap layout Tutorial address: Original address (YouTube) Tutorial of station B: Original reprint (bilibili bili) The content of the two videos is the same, and the second is reprint Design sketch [external link image transfer failed. The source station may h ...