在activity的生命周期中，只要离开了可见阶段，或者说失去了焦点，activity就很可能被KILL掉了，这个时候，就需要有种机制，能保存当时的状态，这就是savedInstanceState的作用。
当一个Activity在pause时，被kill之前，它可以调用onSaveInstanceState()来保存当前activity的状态信息（在paused状态时，要被kill的时候）。用来保存状态信息的Bundle会同时传给两个method,即onRestoreInstanceState() and onCreate().
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