Android: Get Real Path From URI

PathFromURI.java

public String getRealPathFromURI(Context context, Uri contentUri) {
    Cursor cursor = null;
    try {
        String[] proj = {MediaStore.Images.Media.DATA};
        cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
}

Do you have any idea how to write this as an extension function in Kotlin? I tried this:

fun Uri.getRealPath(context: Context): String {
    var cursor: Cursor? = null
    try {
        val proj = arrayOf(MediaStore.Images.Media.DATA)
        cursor = context.contentResolver.query(this, proj, null, null, null)
        val columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA)
        cursor.moveToFirst()
        return cursor.getString(columnIndex)
    } catch (e: Exception) {
        Timber.e(e)
        return ""
    } finally {
        cursor?.close()
    }
}

But I'm getting java.lang.IllegalStateException: cursor.getString(columnIndex) must not be null

not working

not working

private fun getRealPathFromURI(context: Context, contentURI: Uri): String? {
val result: String?
val cursor: Cursor? = context.contentResolver.query(
contentURI, null, null, null, null
)
if (cursor == null) {
result = contentURI.path
} else {
cursor.moveToFirst()
val idx: Int = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA)
result = cursor.getString(idx)
cursor.close()
}
return result
}