Android获取手机信号强度

最新推荐文章于 2025-11-01 12:43:02 发布

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本文介绍了一种在Android设备上获取手机信号强度的方法，通过使用TelephonyManager类和ACCESS_COARSE_LOCATION权限，可以获取到主卡的信号强度，单位为dBm。代码适用于API等级大于等于18的设备。

/**
     * 强制检查权限 android.permission.ACCESS_COARSE_LOCATION，上层未给权限时返回-1表示获取失败
     * API >= 18
     *
     * @return 当前手机主卡信号强度, 单位 dBm（-1是默认值，表示获取失败）
     */
    public static int getMobileDbm() {
        Context context = ContextGetter.applicationContext();
        int dbm = -1;
        TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        List<CellInfo> cellInfoList;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            if (context.checkPermission(Manifest.permission.ACCESS_COARSE_LOCATION, Process.myPid(), Process.myUid()) != PackageManager.PERMISSION_GRANTED) {
                return dbm;
            }
            cellInfoList = tm.getAllCellInfo();
            if (null != cellInfoList) {
                for (CellInfo cellInfo : cellInfoList) {
                    if (cellInfo instanceof CellInfoGsm) {
                        CellSignalStrengthGsm cellSignalStrengthGsm = ((CellInfoGsm) cellInfo).getCellSignalStrength();
                        dbm = cellSignalStrengthGsm.getDbm();
                    } else if (cellInfo instanceof CellInfoCdma) {
                        CellSignalStrengthCdma cellSignalStrengthCdma =
                                ((CellInfoCdma) cellInfo).getCellSignalStrength();
                        dbm = cellSignalStrengthCdma.getDbm();
                    } else if (cellInfo instanceof CellInfoLte) {
                        CellSignalStrengthLte cellSignalStrengthLte = ((CellInfoLte) cellInfo).getCellSignalStrength();
                        dbm = cellSignalStrengthLte.getDbm();
                    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
                        if (cellInfo instanceof CellInfoWcdma) {
                            CellSignalStrengthWcdma cellSignalStrengthWcdma =
                                    ((CellInfoWcdma) cellInfo).getCellSignalStrength();
                            dbm = cellSignalStrengthWcdma.getDbm();
                        }
                    }
                }
            }
        }
        return dbm;
    }