[Android]当Activity启动模式为singleTask时的生命周期

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当Android Activity设置为singleTask启动模式时，再次启动会经历onRestart、onStart和onResume阶段。若两个singleTask Activity互相跳转，可能会导致前一个Activity被销毁并执行onDestroy方法。

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01-09 22:59:24.317 13063-13063/com.dongua.activitytest I/Activity1: onCreate: 
01-09 22:59:24.319 13063-13063/com.dongua.activitytest I/Activity1: onStart: 
01-09 22:59:24.321 13063-13063/com.dongua.activitytest I/Activity1: onResume: 
01-09 22:59:29.501 13063-13063/com.dongua.activitytest I/Activity1: onStop: 
01-09 22:59:37.846 13063-13063/com.dongua.activitytest I/Activity1: onRestart: 
01-09 22:59:37.846 13063-13063/com.dongua.activitytest I/Activity1: onStart: 
01-09 22:59:37.847 13063-13063/com.dongua.activitytest I/Activity1: onResume:

即再次启动会调用onRestart-onStart-onResume

当2个都为singleTask的Activity互相跳转时，则会出现如下情况
activity2 跳转到 activity1 activity1再跳转到activity2 后边activity1执行了onDestroy方法被销毁了

01-09 23:24:37.547 7445-7445/com.dongua.activitytest I/Activity12: Activity2+onCreate: 
01-09 23:24:37.548 7445-7445/com.dongua.activitytest I/Activity12: Activity2+onStart: 
01-09 23:24:37.550 7445-7445/com.dongua.activitytest I/Activity12: Activity2+onResume: 
01-09 23:24:40.636 7445-7445/com.dongua.activitytest I/Activity12: Activity1+onCreate: 
01-09 23:24:40.638 7445-7445/com.dongua.activitytest I/Activity12: Activity1+onStart: 
01-09 23:24:40.639 7445-7445/com.dongua.activitytest I/Activity12: Activity1+onResume: 
01-09 23:24:40.971 7445-7445/com.dongua.activitytest I/Activity12: Activity2+onStop: 
01-09 23:24:52.602 7445-7445/com.dongua.activitytest I/Activity12: Activity2+onRestart: 
01-09 23:24:52.603 7445-7445/com.dongua.activitytest I/Activity12: Activity2+onStart: 
01-09 23:24:52.604 7445-7445/com.dongua.activitytest I/Activity12: Activity2+onResume: 
01-09 23:24:52.960 7445-7445/com.dongua.activitytest I/Activity12: Activity1+onStop: 
01-09 23:24:52.960 7445-7445/com.dongua.activitytest I/Activity12: Activity1+onDestroy: