恕我直言，30秒快速获得听众，获得更新和关闭它背下来。唯一的例外可能是，如果你愿意接受一个非常大的数字的准确性。如果你真的需要它每隔30秒，离开它活跃，但电池受到影响。

IMHO, 30 seconds is to fast to get the listener, get an update, and shut it back down. The only exception to that may be if you are willing to accept a very large accuracy number. If you really need it every 30 seconds, leave it active, but the battery suffers.