How to append 2 strings in Kotlin?

Question

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

Check this link - https://stackoverflow.com/questions/44188240/kotlin-how-to-correctly-concatenate-a-string — Rajshree Tiwari, Jul 25 '18 at 12:20

score 5 · Accepted Answer · answered Jul 25 '18 at 12:22

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

score 2 · Answer 2 · answered Feb 28 '20 at 11:20

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.

score 0 · Answer 3 · answered Jul 25 '18 at 13:09

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)

score 0 · Answer 4 · answered Sep 21 '18 at 15:08

As a future resource and answer why the accepted answer works:-

String Templates:-

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.

score 0 · Answer 5 · answered Jan 27 '22 at 10:20

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

How to append 2 strings in Kotlin?

5 Answers5