Kotlin 如何正确使用 Android 意图保存文件

Question

I am currently trying to save a text file inside a fragment, but I can't get it to work:

Here is the method called when the user clicks the save button

    private fun saveText(){
    val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
        addCategory(Intent.CATEGORY_OPENABLE)
        type = "*/*"
        putExtra(Intent.EXTRA_TITLE, "text.txt")
    }
    startActivityForResult(intent, 1)
    }

Here is the onActivityResult method:

    override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
    if (requestCode == 1 && resultCode == Activity.RESULT_OK) {
        try {
            val path = resultData?.data?.path
            Log.wtf("Path", filePath)
            val writer: Writer = BufferedWriter(FileWriter(path))
            writer.write("Example Text")
            writer.close()
        } catch (e: Exception){
            e.printStackTrace()
        }
    }
}

I also have the permissions set in the manifest and the file itself is created, but nothing is written. Perhaps I'm writing to the file wrong?

The error thrown is FileNotFoundException, because its trying to use a file from /document when I'm selecting one from /downloads

Suggested solution which unfortunately doesn't work:

                resultData?.data?.let {
                requireActivity().contentResolver.openOutputStream(it).use { stream ->
                    stream!!.bufferedWriter().write("Example Text")
                }
            }

Answer 1

A Uri is not a file.

Replace:

        val path = resultData?.data?.path
        Log.wtf("Path", filePath)
        val writer: Writer = BufferedWriter(FileWriter(path))
        writer.write("Example Text")
        writer.close()

with:

resultData?.data?.let { contentResolver.openOutputStream(it).use { stream ->
    stream.writer().write("Example Text")
  }
}