Programmer Group

The problems to be solved are: There are two projects A and B. Project A creates a self-produced and self-sold database through the subclass of SQLiteOpenHelper. Project B does not have a database, but Project B wants to share the same database with Project A. To achieve the above objectives, two system classes are needed: One of the four ...

Crawler background The original plan continued to write about the crawler of mobile APP, and found that the night God simulator was always stuck, lazy, and did not want to find the reason. Haha, so I went on to write the following blog, starting with 50 articles, I would like to write several python crawler operations, that is, using python 3 t ...

brief introduction Demo adds POI interest points to the map by type, and adds name and detail of interest points. Different types of POI interest points on maps are represented by different symbols. Sample data Data: mypoi.udb,mypoi.udd,mypoi.smwu Key types/members GeoStyle class GeoPoint class Environment class Workspace ...

In a relative layout, there are four bottom navigation bars of normal app, which are displayed in equal proportion by weight, but if Button and other custom controls (including non-custom controls) are placed in the relative layout of one proportion, then there will be the problem of Button covering other controls in the layout ...

Recently, we are going to rebuild Android 9.0 compatibility for the old project. The previous app request was packaged package of org.apache.http.legacy.jar, which will not be accessible on the 9.0 simulator, so it needs to be rebuilt. My plan is to directly change the bottom of the package to okhttp, which is simple and fast. ...

Worspace compile time error Errors are reported as follows: Showing Recent Messages :-1: Multiple commands produce '/Users/xxx/Library/Developer/Xcode/DerivedData/TestProject-apxxxxxxxxxxeqsvu/Build/Products/Debug-iphoneos/TestProject.app/LICENSE': 1) Target 'TestProject' (project 'TestProject') has copy command from '/Us ...

This article mainly introduces the relevant information about macro definitions commonly used in iOS, such as UI elements, logs, systems, color classes, and so on. This article describes the place in great detail. Friends who need it can refer to it. Let's learn with the edition below. Preface Macro definitions play an importa ...