How to read json file from path using kotlin

Question

I'm trying to open a file picker in android, select a json file then get the text from it. The app crashes after i select the file because it can not find the path.

I have tried adding external storage read / write permission and changing the path format

/// some Activity code
val myFileIntent=Intent()
.setType("*/*")
.setAction(Intent.ACTION_GET_CONTENT)
startActivityForResult(myFileIntent,10)

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        val path = data!!.data.path
        val jsonContent = File(path).readText()
    }

Hi, this might be of interest stackoverflow.com/a/36129285/235354 — jspcal
– jspcal, Commented Apr 29, 2019 at 17:37
Caused by: java.io.FileNotFoundException: /document/raw:/storage/emulated/0/Download/reteta.json (No such file or directory) at java.io.FileInputStream.open0(Native Method) at java.io.FileInputStream.open(FileInputStream.java:231) at java.io.FileInputStream.<init>(FileInputStream.java:165) at kotlin.io.FilesKt__FileReadWriteKt.readBytes(FileReadWrite.kt:63) at kotlin.io.FilesKt__FileReadWriteKt.readText(FileReadWrite.kt:101) — Teodor Radu
– Teodor Radu, Commented Apr 29, 2019 at 17:50

CommonsWare · Accepted Answer · 2019-04-29 18:02:56Z

3

I'm trying to open a file picker in android

That is not a file picker. That allows the user to choose a piece of content, which may or may not be a file.

The app crashes after i select the file

You are not picking a file. You are picking a piece of content. That content is identified by a Uri, and the scheme of your Uri is content, not file.

Use ContentResolver and openInputStream() to get an InputStream on the content identified by the Uri. You can call readText() on that InputStream to read it in as text.

answered Apr 29, 2019 at 18:02

CommonsWare

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3 Comments

Teodor Radu Over a year ago

Do you have any suggestion on how could i implement that ?

Teodor Radu Over a year ago

This can not be done . You can not call readText() on that InputStream to read it in as text.

CommonsWare Over a year ago

@TeodorRadu: Ah, sorry, I was mis-remembering. You need to convert the InputStream into a BufferedReader: stackoverflow.com/a/39500046/115145

Teodor Radu · Accepted Answer · 2019-04-29 19:27:23Z

2

This is my final working code :

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

        val path = data?.data
        val jsonSelectedFile =  contentResolver.openInputStream(path);
        val inputAsString = jsonSelectedFile.bufferedReader().use { it.readText() }

        Toast.makeText(this, "Json: " +  inputAsString , Toast.LENGTH_LONG).show()
    }

And for calling :

 importJsonButton.setOnClickListener {
            val myFileIntent = Intent()
                .setType("*/*")
                .setAction(Intent.ACTION_GET_CONTENT)

            startActivityForResult(myFileIntent,10)
        }

answered Apr 29, 2019 at 19:27

Teodor Radu

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