I am trying to concatenate 2 String but not sure how to go about it.
this is my code:
val word = R.string.word and i'm trying to append it with "$currentPage/5" inside the setText("$currentPage/5") i tried to make it in this way setText("$word $currentPage/5") and this way setText("${R.string.value} $currentPage/5") and it did not work , it only shows me numbers not the text
try to use this:
val word = getString(R.string.word) text_view.text = "$word $currentPage/5" If you want to edit your value (e.g. current page) wrap it with {} E.g.
val word = getString(R.string.word) text_view.text = "$word ${currentPage/5}" Remember to use proper kotlin syntax
In Kotlin, the concatenation of string can be done by **interpolation/templates**. val a = "Its" val b = "Kotlin!" val c = "$a $b" The output will be Its Kotlin! Or we can alson do concatenate using the **+ / plus() operator**: val a = "String" val b = "Concatenate" val c = a + b val d =a.plus(b) print(c) The output will be: StringConcatenate print(d) The output will be: StringConcatenate Or you can concatenate using the StringBuilder which is a normal way to do that. To concatenate two string, we could do
val concatenatedWord = "${resources.getString(R.string.value)}: ${number/3}."
If R.string.value was "The result" and number was 15, value of concatenatedWord will be "The result: 5." Or we could also concatenate using the + operator or using StringBuilder.
But if you do textView.text = "${resources.getString(R.string.value)}: ${number/3}."
AS will warn "Do not concatenate text displayed with setText." so, in the case of setting concatenated text in textview, consider using
String.format("%s: %d.", resources.getString(R.string.value): number/3)
As a future resource and answer why the accepted answer works:-
Strings may contain template expressions, i.e. pieces of code that are evaluated and whose results are concatenated into the string.
How to implement these?
A template expression should start with a dollar sign ($) and consists of either a simple name:
when the expression is a simple variable.
val i = 10 println("i = $i") // prints "i = 10" or else arbitrary expression in curly braces:
val s = "abc" println("$s.length is ${s.length}") // prints "abc.length is 3" Note :- Templates are supported both inside raw strings and inside escaped strings.
val nameOfAnimal = "fish" val speciesClass = "is an Aquatic Vertebrate" println(nameOfAnimal.plus(speciesClass)) println(nameOfAnimal+speciesClass) println("$nameOfAnimal $speciesClass") Results:
fishis an Aquatic Vertebrate fishis an Aquatic Vertebrate fish is an Aquatic Vertebrate 