Android中在XML文件里@+id/和@id/的区别
@+id/<标识符代码> 与 @id/<标识符代码>两种格式的区别：首先这里@我们可以理解为引用，而@后边的+代表自己新声明的。即：@id代表引用已有的id，而@+id是新增加一个id
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