gistfile1.txt

  /**
         * Get a file path from a Uri. This will get the the path for Storage Access
         * Framework Documents, as well as the _data field for the MediaStore and
         * other file-based ContentProviders.
         *
         * @param uri The Uri to query.
         * @author paulburke
         */
        @TargetApi(Build.VERSION_CODES.KITKAT)
        fun getPath(context: Context, uri: Uri): String? {
            val isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
            if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
                if (isExternalStorageDocument(uri)) {
                    val docId = DocumentsContract.getDocumentId(uri)
                    val split = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
                    val type = split[0]
                    if ("primary".equals(type, ignoreCase = false)) {
                        return Environment.getExternalStorageDirectory().toString() + "/" + split[1]
                    }
                } else if (isDownloadsDocument(uri)) {
                    val id = DocumentsContract.getDocumentId(uri)
                    val contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), java.lang.Long.valueOf(id))
                    return getDataColumn(context, contentUri, null, null)
                } else if (isMediaDocument(uri)) {
                    val docId = DocumentsContract.getDocumentId(uri)
                    val split = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
                    val type = split[0]

                    var contentUri: Uri? = null
                    if ("image" == type) {
                        contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
                    } else if ("video" == type) {
                        contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI
                    } else if ("audio" == type) {
                        contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
                    }

                    val selection = "_id=?"
                    val selectionArgs = arrayOf(split[1])

                    return contentUri?.let { getDataColumn(context, it, selection, selectionArgs) }
                }
            } else if ("content".equals(uri.scheme, ignoreCase = true)) {
                return getDataColumn(context, uri, null, null)
            } else if ("file".equals(uri.scheme, ignoreCase = true)) {
                return uri.path
            }

            return null
        }

        private fun getDataColumn(context: Context, uri: Uri, selection: String?, selectionArgs: Array<String>?): String? {

            var cursor: Cursor? = null
            val column = "_data"
            val projection = arrayOf(column)

            try {
                cursor = context.contentResolver.query(uri, projection, selection, selectionArgs, null)
                if (cursor != null && cursor.moveToFirst()) {
                    val columnIndex = cursor.getColumnIndexOrThrow(column)
                    return cursor.getString(columnIndex)
                }
            } catch (e: Exception) {
                Logger.e(Constants.APP_NAME, e)
            } finally {
                cursor?.close()
            }
            return null
        }

        private fun isExternalStorageDocument(uri: Uri): Boolean {
            return "com.android.externalstorage.documents" == uri.authority
        }

        private fun isDownloadsDocument(uri: Uri): Boolean {
            return "com.android.providers.downloads.documents" == uri.authority
        }

        private fun isMediaDocument(uri: Uri): Boolean {
            return "com.android.providers.media.documents" == uri.authority
        }