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Fix/csv utf8 bom Improve CSV UTF-8 compatibility with Excel #497

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Fix/csv utf8 bom Improve CSV UTF-8 compatibility with Excel #497

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8441e51
Fix CSV UTF-8 encoding detection in Excel
Space-FuCheng Sep 15, 2026
340cdce
Keep CSV BOM change minimal
Space-FuCheng Sep 15, 2026
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4 changes: 4 additions & 0 deletions data_local/src/main/java/com/example/util/simpletimetracker/data_local/file/CsvRepoImpl.kt
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Expand Up @@ -61,6 +61,9 @@ class CsvRepoImpl @Inject constructor(
fileOutputStream = fileDescriptor?.fileDescriptor
?.let(::FileOutputStream)?.buffered()

// Write UTF-8 BOM so Excel can detect the CSV encoding correctly.
fileOutputStream?.write(UTF8_BOM)

// Write csv header
fileOutputStream?.write(CSV_HEADER.toByteArray())

Expand Down Expand Up @@ -279,6 +282,7 @@ class CsvRepoImpl @Inject constructor(

companion object {
private const val QUOTE = "\""
private val UTF8_BOM = byteArrayOf(0xEF.toByte(), 0xBB.toByte(), 0xBF.toByte())
private const val CSV_HEADER =
"activity name,time started,time ended,comment,categories,record tags,duration,duration minutes\n"
}
Expand Down