设有Activity跳转历史 A->B->C->D。当前在D，想要跳到B，并得到A->B, 而不是A->B->C->D->B
则在跳转时要设置flag: Intent.FLAG_ACTIVITY_CLEAR_TOP
Intent intent = new Intent(D.this, B.class); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent);
详见:
http://blog.csdn.net/lvxiangan/article/details/42120951
原文：http://www.cnblogs.com/fashare/p/4544807.html