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in android studio my phone in device chooser not showing

The device chooser is not showing my plugged phone , I tried Samsung note3 and note 4 , both of them are not showing in android studio. it was showing ... before , in note4 no I didnt activate debug mode See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in R shiny, how to automatically or based on function tabPanel, given we have 3 levels of lists?

I need to create conditional 3 levels of tabs the first level or tabPanel includes three tabs "NUTS","SWEETS","DRINKS" so the level1<-list(DRINKS, ... is too vulnerable to mistake, thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - Does iOS keychain storage persist when restoring an app to a new device?

My question is directly related to this one but is different: iOS: keychain on new devices or on restores. The poster is curious if you store information in ... if the app is removed for a time period. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in perl, how do we detect a segmentation fault in an external command

Following is C code that is destined to crash: #include<stdio.h> #include<stdlib.h> int main() { char *p = NULL; printf("Value at P: %c ... be the way to detect segmentation fault in an external command? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in R, check if string appears in row of dataframe (in any column)

temp = structure(list(name1 = structure(c(2L, 1L, 2L, 1L, 2L), .Label = c("Joe", "Mike"), class = "factor"), name2 = c("Nick", "Matt ... 2nd and 4th rows. Any simple help with this is appreciated, thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in wpf datagrid how to get the blank row on top?

in wpf datagrid how to get the blank row on top? ie when user wants to add new row, it always comes at the bottom. But I want it to be on top ... can i do this in XAML ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in wpf how do i make a datagrid fit the window height

I have a grid with 3 columns and 2 rows <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="10"/> <ColumnDefinition Width="*"/ ... does not feel restricted... What to do? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in Lua, how can I use a table as varargs (...)?

strjoin accepts one string and then a variable number of arguments. I'm looking for a way to take a table with a variable number of arguments and use each item ... ', myTable[1], myTable[2], myTable[3]) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in jQuery what is the difference between $.myFunction and $.fn.myFunction?

I'm delving into writing plugins for jQuery and I'm trying to understand the distinction between $.f and $.fn.f I've seen pluggin authors use both ... someone explain this to me, reasoning, benefits, etc? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - What should be the developer payload in android in-app billing v3 api?

I am implementing in-app billing in my app to unlock premium features. The in-app billing sets up correctly. Everything seems fine except the 'developer payload' ... Can I use the user's primary email ID? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in jQuery what is the difference between $.myFunction and $.fn.myFunction?

I'm delving into writing plugins for jQuery and I'm trying to understand the distinction between $.f and $.fn.f I've seen pluggin authors use both ... someone explain this to me, reasoning, benefits, etc? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - What should be the developer payload in android in-app billing v3 api?

I am implementing in-app billing in my app to unlock premium features. The in-app billing sets up correctly. Everything seems fine except the 'developer payload' ... Can I use the user's primary email ID? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - In app billing v3 Android non-consumable items

I'm starting with In App Billing and I would like to sell some magazines in my app. If one user buy one magazine he can read it always. I read ... that the item is non-consumable? Thank you in advance See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in thymeleaf, how can write th:each to combine rows and columns?

I want to write 4 columns in a row like this <div class="row"> <div class="span3">Something</div> <div class="span3">Something</div> <div class=" ... class="row"> or <div class="span3">) as attribute. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in my bash loop over a list of some servers, if the ssh connects the bash script exits

I have a quick script to run a command on each server using ssh (i am sure there are lots of better ways to do this, but it was intended to just work ... for the loop or the var... any suggestions on why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - Android In-App Billing error You need to sign into your google account

I am implementing in-app purchase using https://github.com/anjlab/android-inapp-billing-v3 . But while in app pop up open it shows "Error ... . I tested using different devices as same result. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - Selling something inside an application on iOS

I've heard there are some precautions to take to develop a market in an application. I'm developing an application for a football club. I would like ... kind of information. Do you know anything about it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - Ios how to get a list of already purchased products?

I'm building an app that uses In app purchase. I'm using non-consumable product types. Everything works ok (setting up products, buying...). What ... app or changing device)? Is that possible? Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in R, how to calculate mean of all column, by group?

I need to get the mean of all columns of a large data set using R, grouped by 2 variables. Lets try it with mtcars: library(dplyr) g_mtcars <- group_by(mtcars ... drat), mean (wt),...) it is not pratical. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in dart, which is better List.generate or List.of or List.from

in Dart Documentation we have three iterable options to choose from to create lists .which one is best suited for what purpose and which is more effiecient for what purpose? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - how to get subscription expire date in inapp v3 android

Hi I have I implemented inapp billing V3 for one year subscription for a item using android-inapp-billing-v3. I want to show remaining days in ... how to get subscription initiated date and expiry date. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in what way is java.net.Socket threadsafe?

I have a Socket that I am both reading and writing to, via BufferedReaders and BufferedWriters. I'm not sure which operations are okay to do from ... read before I write (which would be annoying). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in PHP, how to remove specific class from html tag?

given the following string in PHP: $html = "<div> <p><span class='test1 test2 test3'>text 1</span></p> <p><span class='test1 test2'> ... there are multiple attributes like my example above. Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in C++, what's the difference between an object and a pointer to an object?

In java and objective-c, a variable representing an object is generally a pointer to that object. However, it seems that in C++, it's common to have ... to a function, does the entire object get copied? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - iOS Server Side Validation - receipt types

I'm getting 2 kinds of receipt formats from Apple when i try to verify purchases on the server. Any idea what's the difference ? 1) content: { status: ... "Sandbox" }, environment: "Sandbox", status: 0 } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in app purchase - (iOS + StoreKit) Can I detect when I'm in the sandbox?

I've got in-app purchases working just fine, and I'm going the server validation route. The server needs to know whether I'm in the sandbox or not, so ... then it wouldn't do any harm would it? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in entity framework code first, how to use KeyAttribute on multiple columns

I'm creating a POCO model to use with entity framework code first CTP5. I'm using the decoration to make a property map to a PK column. But how ... result of the order of properties in the class? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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in r combine a list of lists into one list

I cannot find out can to get a list of all entry of the sublists? Here's a simple example, a list o lists: listoflists <- list("A"=list(c ... )) {listofvectors <- c(listofvectors, listoflists[[i]])} See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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