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jamesxu Material Design中关于Avatar的定义是比较宽松的,我是照着Google Messager & Gmail 做的,也遵循了相关规范,这么说也是没错的。
Avatars and thumbnails
Avatars and thumbnails represent entities or content, either literally through photography or conceptually through illustration. Generally, they are tap targets that lead to a primary view of the entity or content.
Avatars can be used to represent people. For personal avatars, offer personalization options. As users may choose not to personalize an avatar, provide delightful defaults. When used with a specific logo, avatars can also be used to represent brand.
Thumbnails allude to more information—letting the user peek into content—and assist navigation. Thumbnails let you include imagery in tight spaces.