Android 手机信号 dBm, asu

最新推荐文章于 2024-05-09 15:06:55 发布

原创最新推荐文章于 2024-05-09 15:06:55 发布 · 4k 阅读

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#android #手机 #signal

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本文探讨了Android手机3G与2G信号的区分，并详细解释了GSM信号强度单位dBm和asu之间的换算公式。通过BatteryStatsImpl.java和Phone.java的相关代码，阐述了如何获取当前信号强度，以及SignalStrength接口中ASU的特殊值含义，帮助理解信号质量的评估方式。

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<3G与2G信号区分>

<BatteryStatsImpl.java>

if (!signalStrength.isGsm()) {

int dBm = signalStrength.getCdmaDbm();
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();