Android 问:如何从特定目录获取图像列表

Android Q: How to get a list of images from a specific directory

Android 问:我需要从特定目录中获取图像列表,我将图像保存在该目录中并在我的应用程序中显示这些图像。

保存图片代码:

final String relativeLocation = Environment.DIRECTORY_PICTURES + File.separator + "MyMedia" + File.separator + "Photo";
            ContentResolver resolver = context.getContentResolver();
            ContentValues contentValues = new ContentValues();
            contentValues.put(MediaStore.MediaColumns.DISPLAY_NAME, name);
            contentValues.put(MediaStore.MediaColumns.MIME_TYPE, "image/jpg");
            contentValues.put(MediaStore.MediaColumns.RELATIVE_PATH, relativeLocation);
            Uri imageUri = resolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);
            fos = resolver.openOutputStream(Objects.requireNonNull(imageUri));
            bmp.compress(Bitmap.CompressFormat.JPEG,100, fos);
            Objects.requireNonNull(fos).close();
            Objects.requireNonNull(fos).flush();

获取图片代码:

Uri externalUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                String[] projection = {
                        MediaStore.Files.FileColumns._ID,
                        MediaStore.Images.Media.DATE_TAKEN,
                        MediaStore.MediaColumns.TITLE,
                        MediaStore.Images.Media.MIME_TYPE,
                        MediaStore.MediaColumns.RELATIVE_PATH
                };
                Cursor cursor = context.getContentResolver().query(externalUri, projection, null, null,  MediaStore.Images.Media.DATE_TAKEN +" DESC");


            int idColumn = cursor.getColumnIndex(MediaStore.MediaColumns._ID);
            int titleColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.TITLE);
            int relativePathColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.RELATIVE_PATH);

            while (cursor.moveToNext()) {
                Uri photoUri = Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, cursor.getString(idColumn));

            }

我需要直接查询以获取保存在 RELATIVE_PATH 中的所有图像的列表,("MyMedia/Photo") 无需添加,如果游标循环中的条件检查 relativePathColumn 如果等于 "MyMedia/Photo",因为用户设备中的所有图像都有这个循环! 我们有没有办法直接从我的目录中获取图像列表?

String path = "MyMedia/Photo";           

String selection = MediaStore.Files.FileColumns.RELATIVE_PATH + " like ? " ;

String selectionargs []= new String[]{"%" + path + "%"};  

.query(externalUri, projection, selection, selectionars,  MediaStore.Images.Media.DATE_TAKEN