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早上突然想起：activity切换的时候生命周期是什么来着？
Activity A跳转到Activity B，然后B再跳到A；
A；onCreat-start-resume
然后 onpause-B oncreat还是onPuse-onStop-B onCreat??????
what a fuck？ 这都忘了？
那就实际测试一遍再学一次吧。
1.先打印A启动时的生命周期：
08-28 22:17:15.508 26493-26493/com.yosemite.testmvp E/onCreate: =-=08-28 22:17:15.616 26493-26493/com.yosemite.testmvp E/onStart: =-=08-28 22:17:15.616 26493-26493/com.yosemite.testmvp E/onResume: =-=恩，没问题，这个没错，还是记忆中的味道
2.然后，关键的地方来了，跳转中的生命周期，是B先onResume A再onStop，还是A先onStop?
输出生命周期，log中带2的表示Activity B
08-28 22:17:40.830 26493-26493/com.yosemite.testmvp E/onPause: =-=08-28 22:17:40.840 26493-26493/com.yosemite.testmvp E/22onCreate: =-=08-28 22:17:40.852 26493-26493/com.yosemite.testmvp E/22onStart: =-=08-28 22:17:41.086 26493-26518/com.yosemite.testmvp E/Surface: getSlotFromBufferLocked: unknown buffer: 0xe844938008-28 22:17:41.465 26493-26493/com.yosemite.testmvp E/onSaveInstanceState: =-=08-28 22:17:41.465 26493-26493/com.yosemite.testmvp E/onStop: =-=恩，这下记住了，B在onResume后，A才会onStop,
3.然后，我们再看B返回到A，到这里，猜想应该是，B onPause--A onRestart onResume--B onStop-onDestroy?
那就再输出一下好了：
8:03.859 26493-26493/com.yosemite.testmvp E/22onPause: =-=08-28 22:18:03.874 26493-26493/com.yosemite.testmvp E/onRestart: =-=08-28 22:18:03.874 26493-26493/com.yosemite.testmvp E/onStart: =-=08-28 22:18:03.874 26493-26493/com.yosemite.testmvp E/onResume: =-=08-28 22:18:04.093 26493-26518/com.yosemite.testmvp E/Surface: getSlotFromBufferLocked: unknown buffer: 0xe844946008-28 22:18:04.315 26493-26493/com.yosemite.testmvp E/22onStop: =-=08-28 22:18:04.315 26493-26493/com.yosemite.testmvp E/22onDestroy: =-=是的，果然如此。
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