Ben shu jie shao le cong Android kai yuan gong cheng dao yi ge ji yu shi ji ying jian chan pin zhong de zhu yao gong zuo, Yi fang mian rang du zhe qing xi ba wo ge ge zi xi tong de jia gou, Ling yi fang mian rang du zhe ba wo yi zhi zhei ge kai fa he xin huan jie de yao dian.