学习demo
学习demo
改应用主要学习android相关知识，涉及到的知识点：
1.Activity生命周期 2.Fragment生命周期 3.列表数据加载 4.图片加载 5.数据库 （曾删改差） 6.动画 7.多线程 异步加载 8.hanlder 9.设计模式
以上知识点只是大概的，如开发过程在自己用到了哪些知识点，都可补充上去。
该应用主题功能包含如下：
1.通话记录列表展示 通话记录列表显示内容： 1.头像 2.名字 3.电话呼叫类型 4.电话呼叫时间 5.电话号码 通话记录列表需要如下功能： 1.长按选择功能 2.点击拨打电话功能 2.联系人列表展示 联系人列表显示内容： 1.头像 2.名字 3.收藏联系人列表展示 收藏联系人列表显示内容： 1.头像 2.名字 4.拨号盘 （包含进场动画以及退出动画） 实现现有拨号盘建议版
5.添加联系人
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