android Learning Notes - Broadcast Receiver Receiver Receiver Receiver Broadcasting Process (ip Dialer, sd Card Status, SMS, Application Installation and Unloading)

android has built-in many system-level broadcasts, such as a broadcast when the mobile phone is turned on, a broadcast when the battery power changes, a broadcast when the time or time zone changes, and so on. To receive these broadcasts, you need to use a broadcasting receiver. Here's a basic understanding of the process. Cat ...

Posted on Thu, 20 Dec 2018 05:54:05 -0800 by moiseszaragoza

URLDecoder exception Illegal hex characters in escape (%)

Recent redevelopment on the company system, encounter such an error URLDecoder exception Illegal hex characters in escape (%). First, introduce the structure of this development. First, there is a component system providing services, temporarily called System A, then there is a system providing access to the outside world, called System B, and ...

Posted on Tue, 18 Dec 2018 13:03:04 -0800 by guru2k9

Python 3 full stack development - built-in function complement, reflection, metaclass, u str_, u del_, exec, type, u call_ method

I. Built-in Function Supplement 1. isinstance(obj,cls) checks whether obj is a cls-like object? class Foo(object):   pass obj = Foo() print(isinstance(obj, Foo)) #The result is True 2. issubclass(sub, super) checks whether the subclass is a derived class of the super class. class Foo(object):   pass class Ba ...

Posted on Mon, 17 Dec 2018 02:12:04 -0800 by Gorf

Android Background Style shape -- line Line, ring Ring

I. Write in the foregoing: Rectangle rectangle and oval ellipse are introduced before, ring ring ring and line line are introduced below. As a programmer, it's a terrible thing to feel that there's nothing to do. Looking at it, the world of coding is too big, and there's a lot to learn. It's necessary to have an effective way of learning that ...

Posted on Sat, 15 Dec 2018 09:03:03 -0800 by missyevil

Memory Management and Circular References in Python

-- [since Python 3.4, circular references are handled much better](http://engineering.hearsaysocial.com/2013/06/16/circular-references-in-python/#comment-2882030670) Nice post. Note that starting from Python 3.4, circular references are handled much better (docs imply it should be rare that they are not collected -- but don't give specifics ab ...

Posted on Thu, 13 Dec 2018 23:48:05 -0800 by glory452

"0014" - Solidity Types - Dynamic size byte array

Kong Yi College: Leading Brand of Vocational Education in Domestic Block Chain Author: Li Yuechun, Block Chain, High Availability Architecture Engineer Wechat: Liyc1215 QQ group: 348924182 blog: http://liyuechun.org I. Dynamically-sized byte array String is a dynamic size UTF-8 encoding string. It is actually a special variable byte array. ...

Posted on Wed, 12 Dec 2018 21:27:07 -0800 by Kaboom