如何获取从whatsApp处理的Uri的真实路径

public String getRealPathFromUri(Context context, Uri uri) {
    Cursor cursor = null;
    try {
        String[] projection = { MediaStore.Images.Media.DATA };
        cursor = context.getContentResolver().query(uri, projection, null, null, null);
        if (cursor != null && cursor.moveToFirst()) {
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            return cursor.getString(column_index);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (cursor != null)
            cursor.close();
    }
    return uri.getPath();
}