Kotlin Open file on button click

Question

I am new to Kotlin. Can someone please tell me how to open a file on click of a button? Is there some command like:

Button.setOnAction {
File.Open(*//specified file path*)  
        }

I am using Kotlin for Java development and not for andriod. I have a .fxml file where I have defined this button and I need to define the above feature in a kotlin (.kt) file. Thank you.

I'm assuming this is a JavaFX question, depending on your platform requirements you should look at the answers here https://stackoverflow.com/questions/550329/how-to-open-a-file-with-the-default-associated-program — zsmb13, Apr 11 '18 at 17:29
@zsmb13 yes, it is a JavaFX related question but, the feature that I want should be defined in a Kotlin (.kt) file. I have to make this change in an already existing project. — Delin Mathew, Apr 12 '18 at 07:11
You can use the code that solves this in Java with minimal changes in Kotlin. — zsmb13, Apr 12 '18 at 07:40
this may be helpful https://stackoverflow.com/questions/35444264/how-do-i-write-to-a-file-in-kotlin — codeconscious, Apr 12 '18 at 08:12

score 1 · Answer 1 · answered Apr 11 '18 at 17:18

In your activity

btnBack.setOnClickListener {

    val intent = Intent()
            .setType("*/*")
            .setAction(Intent.ACTION_GET_CONTENT)

    startActivityForResult(Intent.createChooser(intent, "Select a file"), 111)

}

still in your activity, insert this to catch the result

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)

    if (requestCode == 111 && resultCode == RESULT_OK) {
        val selectedFile = data?.data //The uri with the location of the file
    }
}

reference

I think you answer is more related to Kotlin for Android because I am getting some errors when I use this code. Really sorry that I did not mention that the feature that I am looking for is not for Android. — Delin Mathew, Apr 12 '18 at 07:15

score 0 · Answer 2 · answered Nov 04 '19 at 18:59

If you need to use this selectedFile path (@Rizkita answer) to read a text file, in onActivityResultfunction add something like this (Kotlin):

  override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)

        if (requestCode == 111 && resultCode == AppCompatActivity.RESULT_OK) {
            val selectedFile = data?.data //The uri with the location of the file

            // Get the File path from the Uri

            println(selectedFile?.lastPathSegment)
            val path = selectedFile?.lastPathSegment.toString().removePrefix("raw:")
            println(path)
            text_reader.setText(getTextContent(path))
        }
    }


fun getTextContent(pathFilename: String): String {

    val fileobj = File( pathFilename )

    if (!fileobj.exists()) {

        println("Path does not exist")

    } else {

        println("Path to read exist")
    }

    println("Path to the file:")
    println(pathFilename)

    if (fileobj.exists() && fileobj.canRead()) {

        var ins: InputStream = fileobj.inputStream()
        var content = ins.readBytes().toString(Charset.defaultCharset())
        return content

    }else{

        return "Some error, Not found the File, or app has not permissions: " + pathFilename
    }
}

Note that in my example text_reader is just the id of a TextView object in the .xml layout file.

Kotlin Open file on button click

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