java.io.UnsupportedEncodingException: java.nio.charset.CharsetICU[UTF-8]

Question

android studio 3.6

in build.gradle:

compileOptions {
        targetCompatibility JavaVersion.VERSION_1_8
        sourceCompatibility JavaVersion.VERSION_1_8
    }

api 'org.apache.commons:commons-io:1.3.2'

in my code

import org.apache.commons.io.FileUtils
import java.io.*
import java.nio.charset.StandardCharsets

     val file = File(folderPath + File.separator + resultFileName)
                FileUtils.writeStringToFile(
                    file,
                    fileContents,
                    StandardCharsets.UTF_8.toString()
                )

but I get error:

 java.nio.charset.CharsetICU[UTF-8]
 java.io.UnsupportedEncodingException: java.nio.charset.CharsetICU[UTF-8]
    at java.nio.charset.Charset.forNameUEE(Charset.java:322)
    at java.lang.String.getBytes(String.java:534)
    at org.apache.commons.io.IOUtils.write(IOUtils.java:810)
    at org.apache.commons.io.FileUtils.writeStringToFile(FileUtils.java:1110)
    at com.myproject.client.common.util.AndroidFileUtil.saveTextToFile(AndroidFileUtil.kt:106)
    at com.myproject.client.service.RecognizedCheckDataService$Companion.saveRecognizedText(RecognizedCheckDataService.kt:117)
    at com.myproject.client.viewmodel.ScanCheckRompetrolViewModel.finishProcessRecognizedCheck(ScanCheckRompetrolViewModel.kt:1059)
    at com.myproject.client.viewmodel.ScanCheckRompetrolViewModel.access$finishProcessRecognizedCheck(ScanCheckRompetrolViewModel.kt:28)
    at com.myproject.client.viewmodel.ScanCheckRompetrolViewModel$runDetector$1.onSuccess(ScanCheckRompetrolViewModel.kt:193)
    at com.myproject.client.viewmodel.ScanCheckRompetrolViewModel$runDetector$1.onSuccess(ScanCheckRompetrolViewModel.kt:28)
    at com.google.android.gms.tasks.zzn.run(Unknown Source)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 Caused by: java.nio.charset.IllegalCharsetNameException: java.nio.charset.CharsetICU[UTF-8]

Leandraleandre

otherwise you can use StandardCharsets.UTF_8.name() – Saied

Answer 1

Charset#toString() is not well specified; on Android, it returns "java.nio.charset.CharsetICU[UTF-8]" as found here. And that string is of course not the name of an existing charset.

But there is no need for the toString() call at all. The writeStringToFile method has an overload that accepts a Charset directly.

Middleweight

Answer 2

In my case, replacing StandardCharsets.UTF_8.toString() with "UTF-8" solved the problem.

Note that toString() returns the result of name(), so replacing it with name(), as the comment on the question suggests, does not change anything.
You can also use name() instead of an explicit canonical name as @johnnyb mentions in the comments below.

Moderator

This is incorrect. In older Android versions, name() and toString() return different values, but name() works fine. Therefore, if you use name() it works on both older and newer versions. – Madalene

Here's an old version where they are different: android.googlesource.com/platform/libcore/+/refs/tags/… . Here is a new version where they are the same: android.googlesource.com/platform/libcore/+/refs/tags/… – Madalene