GPS信号弱、搜不到星解决方法（免root）
gps.conf 内容如下：
#Uncommenting these urls would only enable
#the power up auto injection and force injection(test case).
XTRA_SERVER_1=https://xtrapath1.izatcloud.net/xtra3grc.bin
XTRA_SERVER_2=https://xtrapath2.izatcloud.net/xtra3grc.bin
XTRA_SERVER_3=https://xtrapath3.izatcloud.net/xtra3grc.bin
XTRA_SERVER_4=https://ssl.gpsonextra.net/xtra3grc.bin
XTRA_SERVER_5=https://ssl.izatcloud.net/xtra3grc.bin