Activity总结

       Activity的创建如同在栈里操作一样，满足先进后出的原则，每次创建一个Activity，就把它置于栈顶。如果按手机的返回键，则进行出栈操作。

       例如下面有三个Activity,每次选中按钮时，便创建另外一个Acitivity并跳转到那个Activity。如下：

                                        a1

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                                                 a2

                                        a3

       
                                                                                                               
   
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                                                                       红色
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原文地址：https://www.cnblogs.com/yangzhenyu/p/2172239.html