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Clicking the back button twice to exit an activity
...otlin Activity:
private var doubleBackToExitPressedOnce = false
override fun onBackPressed() {
if (doubleBackToExitPressedOnce) {
super.onBackPressed()
return
}
this.doubleBackToExitPressedOnce = true
Toast.makeText(this, "Please click BACK ...
Simple regular expression for a decimal with a precision of 2
...e
deci_num_checker = re.compile(r"""^[0-9]+(\.[0-9]{1,2})?$""")
valid = ["123.12", "2", "56754", "92929292929292.12", "0.21", "3.1"]
invalid = ["12.1232", "2.23332", "e666.76"]
assert len([deci_num_checker.match(x) != None for x in valid]) == len(valid)
assert [deci_num_checker.match(x) == None fo...
How to change or add theme to Android Studio?
...
123
//you need to go to the File-> settings
in that choose IDE settings-> Appearance in tha...
How to show multiline text in a table cell
...er each line (see below) and it works for me.
George Benson </br>
123 Main Street </br>
New York, Ny 12344 </br>
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What's the difference between dynamic (C# 4) and var?
...ic types in C# - only consuming them), so this isn't unrealistic... oh the fun we could have ;-p
– Marc Gravell♦
Jun 7 '09 at 19:42
...
Remove duplicated rows
...for larger data sets
library(microbenchmark)
library(data.table)
set.seed(123)
DF <- as.data.frame(matrix(sample(1e8, 1e5, replace = TRUE), ncol = 10))
DT <- copy(DF)
setDT(DT)
microbenchmark(unique(DF), unique(DT))
# Unit: microseconds
# expr min lq mean median ...
Rotation methods deprecated, equivalent of 'didRotateFromInterfaceOrientation'?
... share me the method you have used. Thank you
– ask123
Jun 23 '14 at 7:44
2
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How to Batch Rename Files in a macOS Terminal?
...
You can use a regex as well. rename 's/123/onetwothree/g' *
– Bryan
Aug 10 '16 at 17:52
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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...不详）。
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文章转自： 酷 壳 – CoolShell.cn
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Variable length (Dynamic) Arrays in Java
...
123
Yes: use ArrayList.
In Java, "normal" arrays are fixed-size. You have to give them a size an...