Text file logger Android

TextFileLogger.kt

import android.content.Context
import io.reactivex.Completable
import io.reactivex.schedulers.Schedulers
import timber.log.Timber
import java.io.BufferedWriter
import java.io.File
import java.io.FileWriter
import java.io.IOException

object TextFileLogger {

    fun appendLog(text: String, context: Context) {

        Completable.fromCallable {
            val path = context.filesDir;
            val file = File(path, "text_logger.txt")
            if (!file.exists()) {
                try {
                    file.createNewFile()
                } catch (e: IOException) {
                    e.printStackTrace()
                }
            }
            try {
                //BufferedWriter for performance, true to set append to file flag
                val buf = BufferedWriter(FileWriter(file, true))
                buf.append(text)
                buf.newLine()
                buf.close()
            } catch (e: IOException) {
                e.printStackTrace()
            }
        }.subscribeOn(Schedulers.io())
            .subscribe(
            {
                Timber.v("Logging done: $text" )
            },
            {
                it.printStackTrace()
                Timber.v("Logging failed: $text")
            }
        )
    }
}