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What does “xmlns” in XML mean?
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It means XML namespace.
Basically, every element (or attribute) in XML belongs to a namespace, a way of "qualifying" the name of the element.
Imagine you and I both invent our own XML. You invent XML to describe people, I invent mine to describe cities...
How is the java memory pool divided?
...od data, and the code for methods and constructors. The method area is logically part of the heap but, depending on the implementation, a Java VM may not garbage collect or compact it. Like the heap memory, the method area may be of a fixed or variable size. The memory for the method area does not n...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...含内部调运的子方法）执行的真实时间，ms单位；
Calls+Recur Calls/Total
当前方法被调运的次数及递归调运占总调运次数百分比；
CPU Time/Call
当前方法调运CPU时间与调运次数比，即当前方法平均执行CPU耗时时间；
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new DateTime() vs default(DateTime)
...cal.
default(), for any value type (DateTime is a value type) will always call the parameterless constructor.
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Why would one use the Publish/Subscribe pattern (in JS/jQuery)?
...istener", so that we only need one list in the Radio class, and always can call the same function on whatever object we have that wants to listen to the signal. But that still creates a coupling between whatever interface/base class/etc we decide on and the Radio class. Basically whenever you change...
How do I select text nodes with jQuery?
...itespace text nodes are included in the output (in jQuery they are automatically filtered out).
Update: Fixed bug when includeWhitespaceNodes is falsy.
function getTextNodesIn(node, includeWhitespaceNodes) {
var textNodes = [], nonWhitespaceMatcher = /\S/;
function getTextNodes(node) {
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Using build types in Gradle to run same app that uses ContentProvider on one device
...ent setup:
Android Studio Beta 0.9.2
Gradle plugin 0.14.1
Gradle 2.1
Basically, if you need to customise some values for different builds you can do it from the build.gradle file:
use buildConfigField to access it from the BuildConfig.java class
use resValue to access it from resources e.g. @stri...
Line-breaking widget layout for Android
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Since May 2016 there is new layout called FlexboxLayout from Google, which is highly configurable for purpose you want.
FlexboxLayout is in Google GitHub repository at https://github.com/google/flexbox-layout at this moment.
You can use it in your project by...
What's the difference between eval, exec, and compile?
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The short answer, or TL;DR
Basically, eval is used to evaluate a single dynamically generated Python expression, and exec is used to execute dynamically generated Python code only for its side effects.
eval and exec have these two differences:
eval acce...
Max retries exceeded with URL in requests
...has to be exactly right, a rate limit placed by the server. I can make 80 calls and then this message will appear for me. Then after a short time, the server is available for another 80 calls and the cycle repeats. it is too regular to be anything else.
– demongolem
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