Hi,

I am using the PhoneStateListener to collect signal strength
information, but I can not find information about its underlying
implementation details, which will affect the accuracy of the data
collected.

My questions are:

- is the underlying system service doing sampling/averaging of the
signal strength value, over a small time window? If so, what is the
window size?

- how much change will trigger a onSignalStrengthChanged() event? Is
it something like one unit in ASU or dBm?

Thanks!

Yudong

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