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为AppInventor2开发拓展(Extension) · App Inventor 2 中文网
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代码编写
采用自己较为熟悉的java开发环境就行，这里推荐使用VSCode，拓展目录在 appinventor-sources/appinvent...
How do I return multiple values from a function in C?
If I have a function that produces a result int and a result string , how do I return them both from a function?
8 Answe...
Difference between @Before, @BeforeClass, @BeforeEach and @BeforeAll
...
Before and BeforeClass in JUnit
The function @Before annotation will be executed before each of test function in the class having @Test annotation but the function with @BeforeClass will be execute only one time before all the test functions in the class.
Simi...
passing argument to DialogFragment
... dialogFragment.show(fm, "Sample Fragment")
// receive
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
if (getArguments() != null) {
val mArgs = arguments
var myDay= mArgs.getString("title")
}
}
...
Format in kotlin string templates
...ound, you can use something like:
"pi = ${pi.format(2)}"
the .format(n) function you'd need to define yourself as
fun Double.format(digits: Int) = "%.${digits}f".format(this)
There's clearly a piece of functionality here that is missing from Kotlin at the moment, we'll fix it.
...
How to read data when some numbers contain commas as thousand separator?
...tomatically. First create a new class definition, then create a conversion function and set it as an "as" method using the setAs function like so:
setClass("num.with.commas")
setAs("character", "num.with.commas",
function(from) as.numeric(gsub(",", "", from) ) )
Then run read.csv like:
...
How to update a plot in matplotlib?
... the units in the time scale (x-axis) and then I recalculate and call this function plots() . I want the plot to simply update, not append another plot to the figure.
...
How to remove certain characters from a string in C++?
...
// output: 555 5555555
cout << str << endl;
To use as function:
void removeCharsFromString( string &str, char* charsToRemove ) {
for ( unsigned int i = 0; i < strlen(charsToRemove); ++i ) {
str.erase( remove(str.begin(), str.end(), charsToRemove[i]), str.end() )...
Programmatically set left drawable in a TextView
...
Using Kotlin:
You can create an extension function or just use setCompoundDrawablesWithIntrinsicBounds directly.
fun TextView.leftDrawable(@DrawableRes id: Int = 0) {
this.setCompoundDrawablesWithIntrinsicBounds(id, 0, 0, 0)
}
If you need to resize the drawable...
C＋＋模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术
...2>, T3&> {};
最后，还有一种超级牛X的，在tr1里面用以实现function的，以前我都没见过还可以这么玩的：
template<typename T>
class Y;//这是在声明一个类模板，既然声明了，以后就得按这个规矩来，在我们之前的编程经验里，可以重复...