I’m trying to set the background color of a View (in this case a Button). I use this code: // set the background to green v.setBackgroundColor(0x0000FF00 ); v.invalidate(); It causes the Button to disappear from the screen. What am I doing wrong, and what is the correct way to change the background color on any … Read more
How do I create a .pem file to be stored in the hosting server for APN payload data? 11 Answers 11
Arrays in Swift support the += operator to add the contents of one Array to another. Is there an easy way to do that for a dictionary? eg: var dict1 = [“a” : “foo”] var dict2 = [“b” : “bar”] var combinedDict = … (some way of combining dict1 & dict2 without looping) 28 Answers … Read more
How do you reverse a string in C or C++ without requiring a separate buffer to hold the reversed string? 20 Answers 20
Why does this: #include <string> #include <iostream> using namespace std; class Sandbox { public: Sandbox(const string& n) : member(n) {} const string& member; }; int main() { Sandbox sandbox(string(“four”)); cout << “The answer is: ” << sandbox.member << endl; return 0; } Give output of: The answer is: Instead of: The answer is: four 6 … Read more
I’ve searched around but didn’t find if it’s possible. I’ve this MySQL query: INSERT INTO table (id,a,b,c,d,e,f,g) VALUES (1,2,3,4,5,6,7,8) Field id has a “unique index”, so there can’t be two of them. Now if the same id is already present in the database, I’d like to update it. But do I really have to specify … Read more
I successfully implemented the OpenCV square-detection example in my test application, but now need to filter the output, because it’s quite messy – or is my code wrong? I’m interested in the four corner points of the paper for skew reduction (like that) and further processing … Input & Output: Original image: click Code: double angle( … Read more
Is it possible to override the display property with its default value? For example if I have set it to none in one style, and I want to override it in a different with its default. Or is the only way to find out what the default of that element is and then set it … Read more
I was just wondering what does the -u flag mean in this command? git push -u origin master 2 Answers 2
Why does ZonedDateTime now = ZonedDateTime.now(); System.out.println(now.withZoneSameInstant(ZoneOffset.UTC) .equals(now.withZoneSameInstant(ZoneId.of(“UTC”)))); print out false? I would expect the both ZonedDateTime instances to be equal. 1 Answer 1
