How to read and write txt files in android in kotlin

Question

I\'m still pretty much a beginner in kotlin and android studio. I can access most of the android widgets but I cannot access files and so far I managed to come across only the f

Answer 1

I just want to add on to TpoM6oH's answer. When working with Files, you may be not guaranteed with 100% success on the file operations you intend. So, it is a better practice to try and catch for exceptions like filenotfoundexception etc. and take a due care about the flow of program control.

To create a file at the external storage in Android, you can get the location using

Environment.getExternalStorageDirectory()

and check if the location exists. If it does not, create one and continue creating and writing your file using Kotlin

val sd_main = File(Environment.getExternalStorageDirectory()+"/yourlocation")
var success = true
if (!sd_main.exists())
    success = sd_main.mkdir()

if (success) {
    val sd = File("filename.txt")

    if (!sd.exists())
        success = sd.mkdir()

    if (success) {
        // directory exists or already created
        val dest = File(sd, file_name)
        try {
            // response is the data written to file
            PrintWriter(dest).use { out -> out.println(response) }
        } catch (e: Exception) {
            // handle the exception
        }
    }
} else {
    // directory creation is not successful
}

Hope this helps.