Android手机信号
<3G与2G信号区分>
<BatteryStatsImpl.java>
if (!signalStrength.isGsm()) {
if (dBm >= -75) bin = SIGNAL_STRENGTH_GREAT;
else if (dBm >= -85) bin = SIGNAL_STRENGTH_GOOD;
else if (dBm >= -95) bin = SIGNAL_STRENGTH_MODERATE;
else if (dBm >= -100) bin = SIGNAL_STRENGTH_POOR;
else bin = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
} else {
int asu = signalStrength.getGsmSignalStrength();
if (asu < 0 || asu >= 99) bin = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
else if (asu >= 16) bin = SIGNAL_STRENGTH_GREAT;
else if (asu >= 8) bin = SIGNAL_STRENGTH_GOOD;
else if (asu >= 4) bin = SIGNAL_STRENGTH_MODERATE;
else bin = SIGNAL_STRENGTH_POOR;
}
<Phone.java>
GSM信号单位<dBm-asu>换算公式:dBm = -113 -2*asu;
/**
* Get current signal strength. No change notification available on this
* interface. Use <code>PhoneStateNotifier</code> or an equivalent.
* An ASU is 0-31 or -1 if unknown (for GSM, dBm = -113 - 2 * asu).
* The following special values are defined:</p>
* <ul><li>0 means "-113 dBm or less".</li>
* <li>31 means "-51 dBm or greater".</li></ul>
*
* @return Current signal strength as SignalStrength
*/
SignalStrength getSignalStrength();
其它信息：
4G:
String ssignal = signalStrength.toString();
String[] parts = ssignal.split(" ");
String ssignal = signalStrength.toString();
String[] parts = ssignal.split(" ");
The parts[] array will then contain these elements:
part[0] = "Signalstrength:" _ignore this, it's just the title_
parts[1] = GsmSignalStrength
parts[2] = GsmBitErrorRate
parts[3] = CdmaDbm
parts[4] = CdmaEcio
parts[5] = EvdoDbm
parts[6] = EvdoEcio
parts[7] = EvdoSnr
parts[8] = LteSignalStrength
parts[9] = LteRsrp
parts[10] = LteRsrq
parts[11] = LteRssnr
parts[12] = LteCqi
parts[13] = gsm|lte
parts[14] = _not really sure what this number is_
So, LTEdBm is :
TelephonyManager tm = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
int dbm = 0;
if ( tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_LTE){
dbm = Integer.parseInt(parts[8])*2-113;
}
else{
if (signalStrength.getGsmSignalStrength() != 99) {
int intdbm = -113 + 2
* signalStrength.getGsmSignalStrength();
dbm = Integer.toString(intdbm);
}
}
//GSM信号单位<dBm-asu>换算公式:dBm = -113 +2*asu;
参考：
