Android Activity生命周期演示源码，从第一个Activity到第二个Activity，Android Activity形象的说就是一个容器，在里面放置各种控件(按钮,文本,复选框等),就形成了软件的界面~ Activity是可见的。-Android Activity lifecycle demo source code, that is a container in which to place various controls (buttons, text, check boxe