First I want to acheive battery status and signal strength instantly.
For Battery Status, we can use SystemProperties.get
("status.battery.level_raw") to get current battery level. This class
is not in SDK reference, but we can see this function is used in
BatteryService and other fields. I use it successfully
But for Signal Strength, I only find the way to use
onSignalStrengthChange(int asu) which only gives us an "asu", new
version seems to support onSignalStrengthsChange(....). But now, is
there better ways for exact signal strength?
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