Android oreo group彩信文本未下载

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I followed the documentation provided here and can successfully create a notification group on Android N and higher. The issue I'm having however, is with Android Oreo, each notification posted to the group plays the sound for the group. This is annoying because I'd just like the sound to play once. Constraintlayout Group简介在开发中，有时候需要同时隐藏或者显示多个控件，用Group就可以很好的实现，是一个辅助类，不会绘制到屏幕上，也不会展现给用户。通过属性app:constraint_referenced_ids将一些 View 组成组进行集体操作，最常见的操作是setVisibility