How to do url encoding for query parameters in Kotlin

kotlin urlencode query-parameters
Mia picture Mia · Jul 8, 2019 · Viewed 10.5k times · Source

I am new to Kotlin & I am trying to url encode my url which has query parameters. 

private const val HREF = "date?July 8, 2019"
private const val ENCODED_HREF = print(URLEncoder.encode(HREF, "utf-8"))
private const val URL = "www.example.com/"+"$ENCODED_HREF"

Error: Const 'val' has type 'Unit'. Only primitives and Strings are allowed for private const val ENCODED_HREF

Answer

David P. Caldwell picture David P. Caldwell · Jul 8, 2019

const expressions in Kotlin must be known at compile time. Also, as @Stanislav points out, print is a Unit (i.e., void in Java) method, so printing something destroys its value.

Since your constants are computed, the use of val (which is a runtime constant) is appropriate. The following compiles.

private const val HREF = "date?July 8, 2019"
private val ENCODED_HREF = java.net.URLEncoder.encode(HREF, "utf-8")
private val URL = "www.example.com/"+"$ENCODED_HREF"

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