Question

我正在构建一个应该发送短信的Android应用程序。发送短信时，我想检查信号强度是否足以发送短信。如果没有那么应用程序应该构建一个侦听信号强度的侦听器，并在信号足够时立即发送短信。

我认为我只需要检查是否有任何信号，因为我认为只有非常低的信号足以发送短信。我应该在开始时使用android.telephony.SignalStrength getGsmSignalStrength()来检查信号强度是多少。如果返回值为0，那么我应该创建一个监听器LISTEN_SIGNAL_STRENGTHS？还是有更好的方法吗？

先谢谢

Answer 1

使用此：

   int dBmlevel = 0;
   int asulevel = 0;
   List<CellInfo> cellInfoList = tm.getAllCellInfo();
          //Checking if list values are not null
            if (cellInfoList != null) {
                for (final CellInfo info : cellInfoList) {
                    if (info instanceof CellInfoGsm) {
                        //GSM Network
                        CellSignalStrengthGsm cellSignalStrength = ((CellInfoGsm)info).getCellSignalStrength();
                        dBmlevel = cellSignalStrength.getDbm();
                        asulevel = cellSignalStrength.getAsuLevel();
                    }
                    else if (info instanceof CellInfoCdma) {
                        //CDMA Network
                        CellSignalStrengthCdma cellSignalStrength = ((CellInfoCdma)info).getCellSignalStrength();
                        dBmlevel = cellSignalStrength.getDbm();
                        asulevel = cellSignalStrength.getAsuLevel();
                    }
                    else if (info instanceof CellInfoLte) {
                        //LTE Network
                        CellSignalStrengthLte cellSignalStrength = ((CellInfoLte)info).getCellSignalStrength();
                        dBmlevel = cellSignalStrength.getDbm();
                        asulevel = cellSignalStrength.getAsuLevel();
                    }
                    else if  (info instanceof CellInfoWcdma) {
                        //WCDMA Network
                        CellSignalStrengthWcdma cellSignalStrength = ((CellInfoWcdma)info).getCellSignalStrength();
                        dBmlevel = cellSignalStrength.getDbm();
                        asulevel = cellSignalStrength.getAsuLevel();
                    }
                    else{
                        //Developed as a Cordova plugin, that's why I'm using callbackContext
                        callbackContext.error("Unknown type of cell signal.");
                    }
                }
          }

获得所有网络（LTE，GSM，CDMA和WCDMA）的信号强度（以dBm和asu为单位）。然后创建一个if（）来限制信号电平。例：

if (dBmlevel <= x){ print("You can't sent messages with this current signal");}

确定信号强度是否足以发送SMS

1 个答案: