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问题 I have used the tabbed activity template provided by android studio but i can't happen to find the id for the different fragments used. the template had only one .xml and .java for all three fragments. I made a few changes and made three separate .xml and .java for the three fragments. But I can't figure out how to set the id for the different fragments either from .xml or in .java and without the id I can't perform inter fragment communication. 回答1: Now for retrieving a fragment Fragment f =

问题 Is there any difference between with() and compact() ? Which one is more efficient ? 回答1: with() is a Laravel function and compact() is a PHP function and have totally different purposes. with() allows you to pass variables to a view and compact() creates an array from existing variables given as string arguments to it. See compact() for more info on this matter. 回答2: with() is a method made available by method from one of their classes while compact() is a method that is available by default

问题 When I make a change to a file in the project folder, the 'SOURCE CONTROL: GIT' panel is not showing the changes unless I type git add . in the terminal. They do show as 'Uncommitted Changes' in Git Graph. You can see this in the below screenshot: I have quit VSCode and reopened it, and made sure to open the project root folder which has the .git file which when opened showed the changes, but after I had committed, pushed, and then made some new changes, they were again not picked up. How can

问题 It seems easy to parallelize parsers for large amounts of input data that is already given in a split format, e.g. a large list of individual database entries, or is easy to split by a fast preprocessing step, e.g. parsing the grammatical structure of sentences in large texts. A bit harder seems to be parallel parsing that already requires quite some effort to locate sub-structures in a given input. Common programming language code looks like a good example. In languages like Haskell, that

问题 Attempting to make a protected internal member of a protected internal class within a public class results with the following issue: Inconsistent accessibility: field type 'what.Class1.ProtectedInternalClass' is less accessible than field 'what.Class1.SomeDataProvider.data' The accessibility should be equivalent, as far as I know. Where am I mistaken? Origination class: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace what { public class Class1 {

问题 I'm fairly new to angular in general, i have built my first few apps with it and right now I'm working on some project that contains angular material. When i go to this site i see lots of properties of the MatSelect directive. There is one property called 'empty: boolean' that I would like to access in some way, but i don't know how, can you help me? 回答1: Pay attention to Exported as:matSelect . You can reference it by template reference variable(#var) or by ViewChild: <mat-select #matSelect

问题 Is it possible to create attribute dynamicaly in the Struct instance? class Person < Struct.new(:name) end p = Person.new("Bilbo") p[:surname] = "Jenkins" # does not work 回答1: You could use an OpenStruct : require 'ostruct' p = OpenStruct.new(name: "Bilbo") p[:surname] = "Jenkins" p.surname # => "Jenkins" 回答2: You can define new methods on your Person class by doing this: Person.send(:define_method, :surname){@surname} Person.send(:define_method, :surname=){|x|@surname=x} I prefer define

问题 On my node server, the following code works axios.get('http://localhost:8080/myPath') // works But relative pathes don't work axios.get('/myPath') // doesn't work I get this error : message:"connect ECONNREFUSED 127.0.0.1:80" port:80 How can I get the relative url work like in the browser ? Relative path should be hitting on port 8080, not 80. Where do I set that on my node server ? 回答1: Create a new instance with custom configuation. like below var instance = axios.create({ baseURL: 'http:/

问题 I am customizing woocommerce themes. I stuck on loop product using hook action woocommerce. To call/include the thumbnail image in a loop, we call this hook <?php do_action('woocommerce_before_shop_loop_item_title'); ?> And the thumbnail image appears. I am confused where is the <img src"" .... location? How to edit that code? Thanks 回答1: The hook woocommerce_before_shop_loop_item_title load the image from this function code: if ( ! function_exists( 'woocommerce_template_loop_product

问题 The function poly() in R is used in order to produce orthogonal vectors and can be helpful to interpret coefficient significance. However, I don't see the point of using it for prediction. To my view, the two following model (model_1 and model_2) should produce the same predictions. q=1:11 v=c(3,5,7,9.2,14,20,26,34,50,59,80) model_1=lm(v~poly(q,2)) model_2=lm(v~1+q+q^2) predict(model_1) predict(model_2) But it doesn't. Why? 回答1: Because they are not the same model. Your second one has one