Android 4.4+ Select Multiple Files with UI File Picker

multifilepicker.kt

        val intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("*/*");
        intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
        startActivityForResult(intent, 1)

// In code that handles the result returned to process the files:

        override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
            super.onActivityResult(requestCode, resultCode, data)
            if (requestCode == 1) {
                if (data != null) {
                    val clipData = data.clipData
                        if (clipData != null) println("clipData.itemCount: ${clipData.itemCount}")
                        else println(data.data?.toFile()?.name)
                    } else println("intent is null")
            } else println(requestCode)
        }

// All data is returned in the ClipData object and item count contains the number of items returned.
// Content is the URI for each file to be resolved.