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getting the screen density programmatically in android?
...ources().getDisplayMetrics();
Though Android doesn't use a direct pixel mapping, it uses a handful of quantized Density Independent Pixel values then scales to the actual screen size. So the metrics.densityDpi property will be one of the DENSITY_xxx constants (120, 160, 213, 240, 320, 480 or 640 d...
Scala Doubles, and Precision
...u may use implicit classes:
import scala.math._
object ExtNumber extends App {
implicit class ExtendedDouble(n: Double) {
def rounded(x: Int) = {
val w = pow(10, x)
(n * w).toLong.toDouble / w
}
}
// usage
val a = 1.23456789
println(a.rounded(2))
}
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to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
...ews. Use Instruments to measure the frame rate on the oldest hardware your app will support. If you can't get 60fps, drop down to CoreGraphics. When you've done this for a while, you get a sense for when UIKit is probably a waste of time.
So, why is Core Graphics fast?
CoreGraphics isn't really fa...
How to simulate target=“_blank” in JavaScript
... This answer could be improved by adding some description of what is happening
– Elly Post
Oct 13 '16 at 18:54
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kill -3 to get java thread dump
... It's worth noting that jstack requires the JDK. If you're running apps on a server that only has the JRE installed, you'll need to find another means for thread dumping.
– jeffkempf
Nov 27 '17 at 15:30
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Ignoring new fields on JSON objects using Jackson [duplicate]
...on JSON library to convert some JSON objects to POJO classes on an android application. The problem is, the JSON objects might change and have new fields added while the application is published, but currently it will break even when a simple String field is added, which can safely be ignored.
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iPhone UIButton - image position
I have a UIButton with text "Explore the app" and UIImage (>)
In Interface Builder it looks like:
15 Answers
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Error Dropping Database (Can't rmdir '.test\', errno: 17)
...mac, if you are using a mounted XAMPP on it. open the terminal through the application (mounted xampp app) and follow the guide above.
– Bobby Axe
Dec 5 '19 at 16:33
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Java / Android - How to print out a full stack trace?
In Android (Java) how do I print out a full stack trace? If my application crashes from nullPointerException or something, it prints out a (almost) full stack trace like so:
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Postgresql 9.2 pg_dump version mismatch
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This only happens when you upgrade PostgreSQL. I just did a fresh install of the OS and didn't have any problems with this.
– Seth
May 1 '14 at 22:53
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