File handling using the kotlin functions

FileHelper.kt

class FileHelper {
    companion object {
        // From RAW folder
        fun retrieveTextFromResources(context: Context, resourceId: Int): String {
            return context.resources.openRawResource(resourceId).use { inputStream ->
                // Here we get reference to input stream
                inputStream.bufferedReader().use { bufferedReader ->
                    // Here we get reference to buffered reader
                    bufferedReader.readText()
                }
            }
        }

        // From ASSETS folder
        fun retrieveTextFromAssets(context: Context, fileName: String): String {
            return context.assets.open(fileName).use { inputStream ->
                // Here we get reference to input stream
                inputStream.bufferedReader().use { bufferedReader ->
                    // Here we get reference to buffered reader
                    bufferedReader.readText()
                }
            }
        }
    }
}

Usage.kt

// Say you are retrieving the data from a assets .txt file kept in assets folder, We access as follows
val text = FileHelper.retrieveTextFromResources(app, "our_sample_data.json")