Using a service guarantees that the operation will have at least "service process" priority, regardless of what happens to the activity.
不论activity发生什么情况，使用服务可以保证操作至少拥有“服务进程”的优先级。
Using a service guarantees that the operation will have at least "service process" priority, regardless of what happens to the activity.
不论activity发生什么情况，使用服务可以保证操作至少拥有“服务进程”的优先级。
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