Android应用程序问题：特殊电话列表
我正在尝试编写一个应用程序，允许用户从联系人列表中进行选择，以创建一个联系人列表，如果在几个小时内收到呼叫，则该联系人列表将具有与正常情况不同的可选铃声。
例如，用户可以选择一组朋友的号码，如果在午夜到凌晨 5 点之间接到其中任何一个朋友的电话，手机将使用备用铃声。
我非常缺乏经验，所以几乎不知道如何访问联系人列表或替换铃声。任何帮助将不胜感激
I am trying to write an app that will allow the user to select from a list of contacts to make a list of contacts that if a call is received from in a range of hours will have a selectable ringtone different from what it would be normally.
For example the user could select the numbers of a group of their friends and if a call was received from any of them between the hours of midnight to 5 AM the phone would use the alternate ringtone.
I'm pretty inexperienced and so have pretty much no idea how to access the contacts list or replace the ringtone. Any help would be appreciated
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