java - 使用 CellSignalStrengthGsm 只给出 Integer.MAX_VALUE

Question

看到question之后以及答案(顺便说一句，谢谢)我写的这段代码与答案中的代码几乎相同:

try {
        List<CellInfo> cellInfoList = telephonyManager.getAllCellInfo();
        for (CellInfo cellInfo : cellInfoList) {
            if (cellInfo instanceof CellInfoGsm) {
                CellInfoGsm cellInfoGsm = (CellInfoGsm) cellInfo;
                CellIdentityGsm cellIdentity = cellInfoGsm.getCellIdentity();
                final CellSignalStrengthGsm gsm = ((CellInfoGsm) cellInfo).getCellSignalStrength();
                rsrpValue = gsm.getDbm();
                pciValue = cellIdentity.getCid();
            } else if (cellInfo instanceof CellInfoCdma) {
                CellInfoCdma cellInfoCdma = (CellInfoCdma) cellInfo;
                CellIdentityCdma cellIdentity = cellInfoCdma.getCellIdentity();
                pciValue = cellIdentity.getBasestationId();
            } else if (cellInfo instanceof CellInfoLte){
                    CellInfoLte cellInfoLte = (CellInfoLte) cellInfo;
                    CellIdentityLte cellIdentity = cellInfoLte.getCellIdentity();
                    pciValue = cellIdentity.getPci();
            } else {
                throw new Exception("Unknown type of cell signal!");
            }
        }
    } catch (Exception e) {
        Log.e(TAG, "Unable to obtain cell signal information", e);
    }

但是当我显示 GSM 的 rsrpValue 或 pciValue 时，我总是得到最大整数值 (2147483647)。我在带有 API 17 的手机上试过这个。我的代码有什么问题吗？

谢谢

Answer 1

尝试使用旧的 PhoneStateListener 来监听信号强度变化。这对我有用。使用它来注册监听器:

private TelephonyManager telManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
int currentSignalStrength = 0;
int asu = 0;

telManager.listen(new SignalStrengthListener(), PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);

这是真正的听众:

private class SignalStrengthListener extends PhoneStateListener{

    @Override
    public void onSignalStrengthsChanged(SignalStrength signalStrength)
        {
            super.onSignalStrengthsChanged(signalStrength);
            if (telManager.getPhoneType()== TelephonyManager.PHONE_TYPE_CDMA)
                currentSignalStrength = signalStrength.getCdmaDbm();                  
            else
                asu = signalStrength.getGsmSignalStrength();
        }
    }

在 Xperia Z 上测试，使用 CellInfoGsm 也有同样的问题。