Kotlin generic strength analysis

1, What is generics 1. Generalized type or abstract type 2. An approximate implementation of duck type in static language 2, Implementation mechanism of generics 1. What is true generics? (C#) 2. What is pseudo generic? (Java,Kotlin) 3, Let's first look at the pseudo ubiquity in JAVA and Kotlin But in C ා langua ...

Posted on Sun, 05 Apr 2020 22:00:13 -0700 by danlindley

Getting started with Golang - 5-mapping

mapping Modifying mapping 1. mapping Map maps keys to values. The zero value of the map is nil. Nil maps have no keys or add keys. The make function returns a map of the given type and initializes it for standby. package main import "fmt" type Vertex struct { Lat, Long float64 } var m map[string]Ve ...

Posted on Sun, 05 Apr 2020 20:34:24 -0700 by chimp1950

Tool recommendation - precise positioning of latitude and longitude based on IP address (permanent free)

Today, Xiao Zhang needs to accurately locate the user's country, city, longitude, latitude and other information according to the user's access ip, search from the Internet, and find many websites, but there are almost no fully compliant ones, and some of them need to spend money. As you know, now is the era of information sharing, is there rea ...

Posted on Thu, 02 Apr 2020 20:08:55 -0700 by bigscanner

The use of UIRefreshControl in iOS development

Problem description On the next topic, after TabBar click refresh is implemented, continue to write to complete the function and refresh UITableView. Considering that after iOS 10, UIScrollView already has the property of UIRefreshControl, simply write with its own. So you have the following code: Add UIRefreshControl to UITableVi ...

Posted on Thu, 02 Apr 2020 17:37:43 -0700 by Tim L

Third party apk icons are customized in android Launcher3 to achieve similar theme functions

Recently, I met the need to use the specified icon for the specified app in the Launcher to implement theme like functions. To implement such a function, it is necessary to find out how the Launcher loads the app icon.First, navigate to the cacheLocked () method of the class com.android.launcher3.IconCache.java private ...

Posted on Wed, 01 Apr 2020 21:49:49 -0700 by bluwe

Configuration and acquisition of meta data extended element data in Android learning Manifest

In the Android manifest.xml manifest file, we can sometimes see the following configuration content similar to the beginning of the < meta data... > element: <meta-data       android:name="com.google.android.maps.v2.API_KEY"       android:value="AIzaSyBhBFOgVQclaa8p1JJeqaZHiCo2nfiyBBo" />   <meta-data       and ...

Posted on Wed, 01 Apr 2020 09:29:50 -0700 by CtrlAltDel

Python learning notes (10) Python collection (1)

review int/float/str/list/tuple/dict Integers and floats are immutable, not sequences Strings are immutable, they are sequences List is variable, it's sequence Tuples are immutable. They are sequences Dictionaries are changeable, but not sequential   The basic concept of set Set is A basic mathematical concept. It is the research object of set ...

Posted on Tue, 31 Mar 2020 08:26:00 -0700 by drath

Python 3 standard library: hmac password information signature and verification

1. Signature and verification of hmac password information HMAC algorithm can be used to verify the integrity of information, which may be passed between applications, or stored in a place where there may be a security threat. The basic idea is to generate a cryptographic hash of real data and provide a shared secret key. The resulting hash is ...

Posted on Sat, 28 Mar 2020 22:54:06 -0700 by hamzatki

Tutorial of PyTorch generation countermeasure network (DCGAN)

To read the illustrated tutorial, go to http://studyai.com/pytorch-1.4/beginner/dcgan_faces_tutorial.html This tutorial introduces DCGANs with an example. We will train a general adversarial network (GAN) to generate new celebrities after showing it many photos of celebrities. Most of the code here comes from the implementation of Python / exam ...

Posted on Wed, 11 Mar 2020 04:32:32 -0700 by atulkul

Android Native forbids the use of private library

System private library refers to the Lib library stored under the android system / system/lib / and / vendor/lib, but there is no public API in Android NDK. Starting from Android N (SDK > = 24), opening the system private library through dlopen, or depending on the system private library in the lib library, will generate exceptions, or even ...

Posted on Sun, 08 Mar 2020 19:47:52 -0700 by richardbotw