android.telephony.NeighboringCellInfo Java Examples

public final int[] d() {
    if (this.c == 0) {
        return new int[0];
    }
    List<NeighboringCellInfo> neighboringCellInfo = this.q.getNeighboringCellInfo();
    if (neighboringCellInfo == null || neighboringCellInfo.size() == 0) {
        return new int[]{this.c};
    }
    Object obj = new int[((neighboringCellInfo.size() * 2) + 2)];
    obj[0] = this.c;
    obj[1] = this.a;
    int i = 2;
    for (NeighboringCellInfo neighboringCellInfo2 : neighboringCellInfo) {
        int cid = neighboringCellInfo2.getCid();
        if (cid > 0 && cid != SupportMenu.USER_MASK) {
            int i2 = i + 1;
            obj[i] = cid;
            i = i2 + 1;
            obj[i2] = neighboringCellInfo2.getRssi();
        }
    }
    Object obj2 = new int[i];
    System.arraycopy(obj, 0, obj2, 0, i);
    return obj2;
}
 

/**
 * Requeries neighboring cells
 */
protected void updateNeighboringCellInfo() {
	try {
		/*
		 * NeighboringCellInfo is not supported on some devices and will return no data. It lists
		 * only GSM and successors' cells, but not CDMA cells.
		 */
		List<NeighboringCellInfo> neighboringCells = mainActivity.telephonyManager.getNeighboringCellInfo();
		String networkOperator = mainActivity.telephonyManager.getNetworkOperator();
		mCellsGsm.updateAll(networkOperator, neighboringCells);
		mCellsLte.updateAll(networkOperator, neighboringCells);
	} catch (SecurityException e) {
		// Permission not granted, can't retrieve cell data
		Log.w(TAG, "Permission not granted, cannot get neighboring cell info");
	}
}
 

public Cell convert(NeighboringCellInfo neighboringCell, int mcc, int mnc, int mainCellLac, long mainCellCid) {
    Cell cell = new Cell();
    cell.setNeighboring(true);
    // no type checking because only GSM and UMTS cells can have neighboring cells
    NetworkGroup networkType = NetworkTypeUtils.getNetworkGroup(neighboringCell.getNetworkType());
    if (networkType == NetworkGroup.Gsm) {
        cell.setGsmCellLocation(mcc, mnc, neighboringCell.getLac(), neighboringCell.getCid(), NetworkGroup.Gsm);
    } else {
        int psc = neighboringCell.getPsc();
        if (psc == NeighboringCellInfo.UNKNOWN_CID) {
            psc = Cell.UNKNOWN_CID;
        }
        cell.setGsmCellLocation(mcc, mnc, mainCellLac, mainCellCid, psc, NetworkGroup.Wcdma);
    }
    return cell;
}
 

/**
 * Add neighbouring cells as generated by the getNeighboringCells API.
 * @param neighbours The list of neighbouring cells.
 */
public void addNeighbours(List<NeighboringCellInfo> neighbours) {
    if (neighbours == null || neighbours.isEmpty()) return;
    for (NeighboringCellInfo neighbour : neighbours) {
        List<CellInfo> cellInfos = db.query(neighbour.getCid(), neighbour.getLac());
        if (cellInfos != null && !cellInfos.isEmpty()) {
            for (CellInfo cellInfo : cellInfos) {
                pushRecentCells(cellInfo);
            }
        } else {
            CellInfo ci = new CellInfo();
            ci.lng = 0d;
            ci.lat = 0d;
            ci.CID = neighbour.getCid();
            ci.LAC = neighbour.getLac();
            ci.MCC = -1;
            ci.MNC = -1;
            pushUnusedCells(ci);
        }
    }
}
 

public synchronized void setLastCellLocation(CellLocation cellLocation, NetworkGroup networkType,
                                             String operatorCode, String operatorName, List<NeighboringCellInfo> neighboringCells) {
    Timber.d("setLastCellLocation(): Cell location updated: %s, network type: %s, operator code: %s, operator name: %s", cellLocation, networkType, operatorCode, operatorName);
    // check if any changes
    boolean cellChanged = (!isCellLocationEqual(lastCellLocation, cellLocation)
            || lastNetworkType != networkType
            || !lastOperatorCode.equals(operatorCode)
            || !lastOperatorName.equals(operatorName));
    // update last cell
    this.lastCellLocation = cellLocation;
    this.lastNetworkType = networkType;
    this.lastOperatorCode = operatorCode;
    this.lastOperatorName = operatorName;
    this.neighboringCells = neighboringCells;
    if (this.neighboringCells == null) {
        this.neighboringCells = EMPTY_NEIGHBORING_CELL_LIST;
    }
    if (cellChanged) {
        notifyIfReadyToProcess();
    }
}
 

/**
 * Handle a modem event by trying to pull all information. The parameter inc defines if the
 * measurement counter should be increased on success.
 * @param inc True if the measurement counter should be increased.
 */
private void handle(boolean inc) {
    if (telephonyManager == null) return;
    final List<android.telephony.CellInfo> cellInfos = telephonyManager.getAllCellInfo();
    final List<NeighboringCellInfo> neighbours = telephonyManager.getNeighboringCellInfo();
    final CellLocation cellLocation = telephonyManager.getCellLocation();
    if (cellInfos == null || cellInfos.isEmpty()) {
        if (neighbours == null || neighbours.isEmpty()) {
            if (cellLocation == null || !(cellLocation instanceof GsmCellLocation)) return;
        }
    }
    if (inc) measurement.getAndIncrement();
    add(cellLocation);
    addNeighbours(neighbours);
    addCells(cellInfos);
    synchronized (recentCells) {
        cleanup();
    }
}
 

private void removeDuplicatedNeighbors(List<NeighboringCellInfo> neighboringCells, Cell mainCell) {
    List<NeighboringCellInfo> cellsToRemove = new ArrayList<NeighboringCellInfo>();
    Set<String> uniqueCellKeys = new HashSet<String>();

    uniqueCellKeys.add(createCellKey(mainCell));
    for (NeighboringCellInfo cell : neighboringCells) {
        String key = createCellKey(cell, mainCell);
        if (uniqueCellKeys.contains(key)) {
            Timber.d("removeDuplicatedNeighbors(): Remove duplicated cell: %s", key);
            cellsToRemove.add(cell);
        } else {
            uniqueCellKeys.add(key);
        }
    }

    neighboringCells.removeAll(cellsToRemove);
}
 

/**
 * Returns the information about cell towers in range. Returns null if the information is 
 * not available 
 * 
 * TODO(wenjiezeng): As folklore has it and Wenjie has confirmed, we cannot get cell info from
 * Samsung phones.
 */
public String getCellInfo(boolean cidOnly) {
	if(!(ContextCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION)==PackageManager.PERMISSION_GRANTED)){
		return null;
	}

	initNetwork();
	List<NeighboringCellInfo> infos = telephonyManager.getNeighboringCellInfo();
	StringBuffer buf = new StringBuffer();
	String tempResult = "";
	if (infos.size() > 0) {
		for (NeighboringCellInfo info : infos) {
			tempResult = cidOnly ? info.getCid() + ";" : info.getLac() + "," 
					+ info.getCid() + "," + info.getRssi() + ";";
			buf.append(tempResult);
		}
		// Removes the trailing semicolon
		buf.deleteCharAt(buf.length() - 1);
		return buf.toString();
	} else {
		return null;
	}
}
 

/**
 *  Description:  TODO: add more info
 *
 *  Issues:
 *
 *      [ ]     Getting and comparing signal strengths between different RATs can be very
 *              tricky, since they all return different ranges of values. AOS doesn't
 *              specify very clearly what exactly is returned, even though people have
 *              a good idea, by trial and error.
 *
 *              See note in : SignalStrengthTracker.java
 *
 *  Notes:
 *
 *
 *
 */
public void onSignalStrengthsChanged(SignalStrength signalStrength) {
    // Update Signal Strength
    if (signalStrength.isGsm()) {
        int dbm;
        if (signalStrength.getGsmSignalStrength() <= 2 ||
                signalStrength.getGsmSignalStrength() == NeighboringCellInfo.UNKNOWN_RSSI) {
            // Unknown signal strength, get it another way
            String[] bits = signalStrength.toString().split(" ");
            dbm = Integer.parseInt(bits[9]);
        } else {
            dbm = signalStrength.getGsmSignalStrength();
        }
        mDevice.setSignalDbm(dbm);
    } else {
        int evdoDbm = signalStrength.getEvdoDbm();
        int cdmaDbm = signalStrength.getCdmaDbm();

        // Use lowest signal to be conservative
        mDevice.setSignalDbm((cdmaDbm < evdoDbm) ? cdmaDbm : evdoDbm);
    }
    // Send it to signal tracker
    signalStrengthTracker.registerSignalStrength(mDevice.mCell.getCID(), mDevice.getSignalDBm());
    //signalStrengthTracker.isMysterious(mDevice.mCell.getCID(), mDevice.getSignalDBm());
}
 

/**
 * Perform a (cached) DB query for a given cell tower. Note that MCC and MNC can be null.
 * @param mcc
 * @param mnc
 * @param cid
 * @param lac
 * @return
 */
public List<CellInfo> query(final Integer mcc, final Integer mnc, final int cid, final int lac) {
    if (this.reader == null) return null;

    if (cid == NeighboringCellInfo.UNKNOWN_CID || cid == Integer.MAX_VALUE) return null;

    if (mcc != null && mcc == Integer.MAX_VALUE) return query(null, mnc, cid, lac);
    if (mnc != null && mnc == Integer.MAX_VALUE) return query(mcc, null, cid, lac);

    QueryArgs args = new QueryArgs(mcc, mnc, cid, lac);
    Boolean negative = queryResultNegativeCache.get(args);
    if (negative != null && negative.booleanValue()) return null;

    List<CellInfo> cached = queryResultCache.get(args);
    if (cached != null) return cached;

    List<CellInfo> result = _query(mcc, mnc, cid, lac);

    if (result == null) {
        queryResultNegativeCache.put(args, true);
        return null;
    }

    result = Collections.unmodifiableList(result);

    queryResultCache.put(args, result);
    return result;
}
 

/**
 * Internal db query to retrieve all cell tower candidates for a given cid/lac.
 * @param mcc
 * @param mnc
 * @param cid
 * @param lac
 * @return
 */
private List<CellInfo> _query(Integer mcc, Integer mnc, int cid, int lac) {
    if (this.reader == null) return null;

    // we need at least CID/LAC
    if (cid == NeighboringCellInfo.UNKNOWN_CID) return null;

    android.util.Log.d("LNLP/Query", "(" + mcc + "," + mnc + "," + cid + "," + lac + ")");

    List<CellInfo> cil = _queryDirect(mcc, mnc, cid, lac);
    if (cil == null || cil.size() == 0) {
        if (cid > 0xffff) {
            _queryDirect(mcc, mnc, cid & 0xffff, lac);
        }
    }
    if (cil != null && cil.size() > 0) {
        return cil;
    }

    if (mcc != null && mnc != null) {
        return query(mcc, null, cid, lac);
    }

    if (mcc != null || mnc != null) {
        return query(null,null,cid,lac);
    }

    return null;
}
 

private Cell parseCellInfo(NeighboringCellInfo info) {
    try {
        if (getCellType(info.getNetworkType()) != Cell.CellType.GSM) return null;
        return new Cell(Cell.CellType.GSM, getMcc(), getMnc(), info.getLac(), info.getCid(),
                info.getPsc(), info.getRssi());
    } catch (Exception ignored) {
    }
    return null;
}
 

private void handlePhoneStateChange() {
    List<NeighboringCellInfo> neighboringCellInfo = tm.getNeighboringCellInfo();
    if (neighboringCellInfo == null || neighboringCellInfo.size() == 0) {
        return;
    }

    Log.i(TAG, mTAG + "NeighbouringCellInfo empty - event based polling succeeded!");
    tm.listen(phoneStatelistener, PhoneStateListener.LISTEN_NONE);
    if (neighboringCellInfo == null) {
        neighboringCellInfo = new ArrayList<>();
    }
    neighboringCellBlockingQueue.addAll(neighboringCellInfo);
}
 

protected final List m()
{
    ArrayList arraylist = new ArrayList();
    if (b == null)
    {
        return arraylist;
    }
    if (!c())
    {
        return arraylist;
    }
    Iterator iterator = b.getNeighboringCellInfo().iterator();
    int i1 = 0;
    do
    {
        if (!iterator.hasNext())
        {
            break;
        }
        NeighboringCellInfo neighboringcellinfo = (NeighboringCellInfo)iterator.next();
        if (i1 > 15)
        {
            break;
        }
        if (neighboringcellinfo.getLac() != 0 && neighboringcellinfo.getLac() != 65535 && neighboringcellinfo.getCid() != 65535 && neighboringcellinfo.getCid() != 0xfffffff)
        {
            arraylist.add(neighboringcellinfo);
            i1++;
        }
    } while (true);
    return arraylist;
}
 

private Cell parseCellInfo(NeighboringCellInfo info) {
    try {
        if (getCellType(info.getNetworkType()) != Cell.CellType.GSM) return null;
        return new Cell(Cell.CellType.GSM, getMcc(), getMnc(), info.getLac(), info.getCid(),
                info.getPsc(), info.getRssi());
    } catch (Exception ignored) {
    }
    return null;
}
 

public LegacyMeasurementProcessingEvent(Location lastLocation, long lastLocationObtainedTime,
                                        CellLocation lastCellLocation, SignalStrength lastSignalStrength, NetworkGroup lastNetworkType,
                                        String lastOperatorCode, String lastOperatorName, List<NeighboringCellInfo> neighboringCells,
                                        int minDistance) {
    this.lastLocation = lastLocation;
    this.lastLocationObtainedTime = lastLocationObtainedTime;
    this.lastCellLocation = lastCellLocation;
    this.lastSignalStrength = lastSignalStrength;
    this.lastNetworkType = lastNetworkType;
    this.neighboringCells = neighboringCells;
    this.lastOperatorCode = lastOperatorCode;
    this.lastOperatorName = lastOperatorName;
    this.minDistance = minDistance;
}
 

public static int convertLteDbmToAsu(int dbm) {
    if (dbm == Cell.UNKNOWN_SIGNAL || dbm == NeighboringCellInfo.UNKNOWN_RSSI)
        return Cell.UNKNOWN_SIGNAL;
    if (dbm <= -140)
        return 0;
    if (dbm >= -43)
        return 97;
    return dbm + 140;
}
 

public static int convertGsmDbmToAsu(int dbm) {
    if (dbm == Cell.UNKNOWN_SIGNAL || dbm == NeighboringCellInfo.UNKNOWN_RSSI)
        return Cell.UNKNOWN_SIGNAL;
    if (dbm <= -113)
        return 0;
    int asu = (dbm + 113) / 2;
    if (asu > 31)
        return 31;
    return asu;
}
 

private void processCellLocation(TelephonyManager telephonyManager, CellLocation cellLocation, List<NeighboringCellInfo> neighboringCells) {
    // get network type
    int networkTypeInt = telephonyManager.getNetworkType();
    NetworkGroup networkType = NetworkTypeUtils.getNetworkGroup(networkTypeInt);
    // get network operator (may be unreliable for CDMA)
    String networkOperatorCode = telephonyManager.getNetworkOperator();
    String networkOperatorName = telephonyManager.getNetworkOperatorName();
    Timber.d("processCellLocation(): Operator code = '%s', name = '%s'", networkOperatorCode, networkOperatorName);
    Timber.d("processCellLocation(): Reported %s neighboring cells", (neighboringCells != null ? neighboringCells.size() : null));
    measurementUpdater.setLastCellLocation(cellLocation, networkType, networkOperatorCode, networkOperatorName, neighboringCells);
}
 

public boolean isValid(NeighboringCellInfo neighboringCell, int mcc, int mnc) {
    NetworkGroup netType = NetworkTypeUtils.getNetworkGroup(neighboringCell.getNetworkType());
    if (netType == NetworkGroup.Gsm) {
        return getGsmValidator().isValid(neighboringCell.getCid(), neighboringCell.getLac(), mnc, mcc, NeighboringCellInfo.UNKNOWN_CID);
    } else if (netType == NetworkGroup.Wcdma) {
        // NOTE: Maybe some phones return full set for WCDMA and then it should be valid
        return getGsmValidator().isValid(neighboringCell.getCid(), neighboringCell.getLac(), mnc, mcc, neighboringCell.getPsc());
    }
    return false;
}
 

public Cell convert(CellLocation cellLocation, int mcc, int mnc, NetworkGroup networkType) {
    Cell cell = new Cell();
    if (cellLocation instanceof GsmCellLocation) {
        GsmCellLocation gsmCellLocation = (GsmCellLocation) cellLocation;
        if (gsmCellLocation.getCid() <= 65535 && gsmCellLocation.getPsc() == NeighboringCellInfo.UNKNOWN_CID) {
            cell.setGsmCellLocation(mcc, mnc, gsmCellLocation.getLac(), gsmCellLocation.getCid(), NetworkGroup.Gsm);
        } else {
            // fix invalid network types (unfortunately not possible to distinguish between UMTS and LTE)
            if (networkType == NetworkGroup.Gsm || networkType == NetworkGroup.Cdma)
                networkType = NetworkGroup.Unknown;
            int psc = gsmCellLocation.getPsc();
            if (psc == NeighboringCellInfo.UNKNOWN_CID || psc == Cell.UNKNOWN_CID) {
                psc = Cell.UNKNOWN_CID;
            } else if (psc >= 504) {
                // only UMTS networks support larger PSC
                networkType = NetworkGroup.Wcdma;
            }
            cell.setGsmCellLocation(mcc, mnc, gsmCellLocation.getLac(), gsmCellLocation.getCid(), psc, networkType);
        }
    } else if (cellLocation instanceof CdmaCellLocation) {
        CdmaCellLocation cdmaCellLocation = (CdmaCellLocation) cellLocation;
        cell.setCdmaCellLocation(cdmaCellLocation.getSystemId(), cdmaCellLocation.getNetworkId(), cdmaCellLocation.getBaseStationId());
    } else {
        throw new UnsupportedOperationException("Cell location type not supported `" + cellLocation.getClass().getName() + "`");
    }
    return cell;
}
 

private void updateGsm(Cell cell, int asu) {
    Timber.d("update(): Updating GSM signal strength = %s", asu);
    if (asu == NeighboringCellInfo.UNKNOWN_RSSI)
        asu = Cell.UNKNOWN_SIGNAL;
    // NOTE: for GSM asu is always positive but RSSI negative
    if (asu >= 0)
        cell.setGsmLocationSignal(asu, UnitConverter.convertGsmAsuToDbm(asu));
    else
        cell.setGsmLocationSignal(UnitConverter.convertGsmDbmToAsu(asu), asu);
}
 

private void updateLte(Cell cell, int dbm) {
    Timber.d("update(): Updating LTE signal strength = %s", dbm);
    if (dbm == NeighboringCellInfo.UNKNOWN_RSSI)
        dbm = Cell.UNKNOWN_SIGNAL;
    // NOTE: for LTE asu is always positive but RSRP negative
    if (dbm >= 0)
        cell.setGsmLocationSignal(dbm, UnitConverter.convertLteAsuToDbm(dbm));
    else
        cell.setGsmLocationSignal(UnitConverter.convertLteDbmToAsu(dbm), dbm);
}
 

public static int convertLteAsuToDbm(int asu) {
    if (asu == Cell.UNKNOWN_SIGNAL || asu == NeighboringCellInfo.UNKNOWN_RSSI)
        return Cell.UNKNOWN_SIGNAL;
    if (asu <= 0)
        return -140;
    if (asu >= 97)
        return -43;
    return asu - 140;
}
 

public List<NeighboringCellInfo> getNeighboringCells() {
    return neighboringCells;
}
 

private String createCellKey(NeighboringCellInfo neighboringCell, Cell cell) {
    return cell.getMcc() + "_" + cell.getMnc() + "_" + neighboringCell.getLac() + "_" + neighboringCell.getCid();
}
 

private ParseResult parse(Location location, CellLocation cellLocation, SignalStrength signalStrength,
                          NetworkGroup networkType, String operatorCode, String operatorName, List<NeighboringCellInfo> neighboringCells,
                          long timestamp, int minDistance) {
    // if required accuracy was achieved
    if (!locationValidator.isValid(location)) {
        Timber.d("parse(): Required accuracy not achieved: %s", location.getAccuracy());
        return ParseResult.AccuracyNotAchieved;
    }
    Timber.d("parse(): Required accuracy achieved: %s", location.getAccuracy());
    // get last location
    getAndSetLastLocation();
    // operator name may be unreliable for CDMA
    Timber.d("parse(): Operator name = '%s'", operatorName);
    // get operator codes
    int mcc = Cell.UNKNOWN_CID;
    int mnc = Cell.UNKNOWN_CID;
    if (cellLocation instanceof GsmCellLocation) {
        int[] mccMncPair = MobileUtils.getMccMncPair(operatorCode);
        if (mccMncPair != null) {
            mcc = mccMncPair[0];
            mnc = mccMncPair[1];
        } else {
            Timber.d("parseLocation(): Network operator unknown: %s", operatorCode);
        }
    }
    // validate cell
    if (!cellLocationValidator.isValid(cellLocation, mcc, mnc)) {
        Timber.d("parse(): Cell invalid");
        return ParseResult.NoNetworkSignal;
    }
    // create measurement with basic data
    Measurement measurement = new Measurement();
    measurement.setMeasuredAt(System.currentTimeMillis());
    Cell mainCell = cellLocationConverter.convert(cellLocation, mcc, mnc, networkType);
    measurement.addCell(mainCell);
    // fix time if incorrect
    fixMeasurementTimestamp(measurement, location);
    // if the same cell check distance condition, otherwise accept
    if (lastSavedMeasurement != null && lastSavedLocation != null && !conditionsValidator.isMinDistanceSatisfied(lastSavedLocation, location, minDistance)) {
        List<String> lastMeasurementsCellKeys = new ArrayList<>();
        for (Cell lastCell : lastSavedMeasurement.getCells()) {
            lastMeasurementsCellKeys.add(createCellKey(lastCell));
        }
        boolean mainCellChanged = !lastMeasurementsCellKeys.contains(createCellKey(mainCell));
        if (mainCellChanged) {
            Timber.d("parse(): Distance condition not achieved but cell changed");
        } else {
            Timber.d("parse(): Distance condition not achieved");
            return ParseResult.DistanceNotAchieved;
        }
    }
    // check if location has been obtained recently
    if (!locationValidator.isUpToDate(timestamp, System.currentTimeMillis())) {
        Timber.d("parse(): Location too old");
        return ParseResult.LocationTooOld;
    }
    Timber.d("parse(): Destination and time conditions achieved");
    // update measurement with location
    updateMeasurementWithLocation(measurement, location);
    // update measurement with signal strength
    if (signalStrength != null) {
        cellSignalConverter.update(mainCell, signalStrength);
    }
    if (collectNeighboringCells) {
        // remove duplicated neighboring cells
        removeDuplicatedNeighbors(neighboringCells, mainCell);
        // process neighboring cells
        for (NeighboringCellInfo neighboringCell : neighboringCells) {
            // validate cell
            if (cellLocationValidator.isValid(neighboringCell, mcc, mnc)) {
                // set values
                Cell tempCell = cellLocationConverter.convert(neighboringCell, mcc, mnc, mainCell.getLac(), mainCell.getCid());
                // update measurement with signal strength
                cellSignalConverter.update(tempCell, neighboringCell.getRssi());
                // save
                measurement.addCell(tempCell);
                Timber.d("parse(): Neighboring cell valid: %s", neighboringCell);
            } else {
                Timber.d("parse(): Neighboring cell invalid: %s", neighboringCell);
            }
        }
    }
    // write to database
    Timber.d("parse(): Measurement: %s", measurement);
    boolean inserted = MeasurementsDatabase.getInstance(MyApplication.getApplication()).insertMeasurement(measurement);
    if (inserted) {
        lastSavedLocation = location;
        lastSavedMeasurement = measurement;
        Timber.d("parse(): Measurement saved");
        // broadcast information to main activity
        Statistics stats = MeasurementsDatabase.getInstance(MyApplication.getApplication()).getMeasurementsStatistics();
        EventBus.getDefault().post(new MeasurementSavedEvent(measurement, stats));
        EventBus.getDefault().post(new MeasurementsCollectedEvent(measurement));
        Timber.d("parse(): Notification updated and measurement broadcasted");
        return ParseResult.Saved;
    } else {
        return ParseResult.SaveFailed;
    }
}
 

public static int convertGsmAsuToDbm(int asu) {
    if (asu == Cell.UNKNOWN_SIGNAL || asu == NeighboringCellInfo.UNKNOWN_RSSI)
        return Cell.UNKNOWN_SIGNAL;
    return 2 * asu - 113;
}
 

public boolean isValid(int cid, int lac, int mnc, int mcc, int psc) {
    boolean valid = (isCidOrCiInRange(cid) && isLacOrTacInRange(lac)
            && isMncInRange(mnc) && isMccInRange(mcc)
            && (psc == NeighboringCellInfo.UNKNOWN_CID || psc == Cell.UNKNOWN_CID || isPscOrPciInRange(psc)));
    return valid;
}
 

/**
 * Adds or updates a cell tower.
 * <p>
 * If the cell tower is already in the list, its data is updated; if not, a
 * new entry is created. Cells whose network type is not LTE will be
 * rejected.
 * <p>
 * This method will set the cell's identity data, generation and its signal
 * strength.
 * @return The new or updated entry, or {@code null} if the cell was rejected
 */
public CellTowerLte update(String networkOperator, NeighboringCellInfo cell) {
	int mcc = CellTower.UNKNOWN;
	int mnc = CellTower.UNKNOWN;
	if (networkOperator.length() > 3) {
		mcc = Integer.parseInt(networkOperator.substring(0, 3));
		mnc = Integer.parseInt(networkOperator.substring(3));
	}
	CellTowerLte result = null;
	CellTowerLte cand = this.get(mcc, mnc, cell.getLac(), cell.getCid());
	if ((cand != null) && CellTower.matches(cell.getPsc(), cand.getPci()))
		result = cand;

	if (result == null) {
		cand = this.get(cell.getPsc());
		if ((cand != null)
				&& CellTower.matches(mcc, cand.getMcc())
				&& CellTower.matches(mnc, cand.getMnc())
				&& CellTower.matches(cell.getLac(), cand.getTac())
				&& CellTower.matches(cell.getCid(), cand.getCi()))
			result = cand;
	}
	if (result == null)
		result = new CellTowerLte(mcc, mnc, cell.getLac(), cell.getCid(), cell.getPsc());
	result.setNeighboringCellInfo(true);
	int networkType = cell.getNetworkType();
	switch (networkType) {
	case TelephonyManager.NETWORK_TYPE_LTE:
			result.setAsu(cell.getRssi());
			break;
		default:
			// not an LTE cell, return
			return null;
	}
	result.setNetworkType(networkType);
	if (result.getMcc() == CellTower.UNKNOWN)
		result.setMcc(mcc);
	if (result.getMnc() == CellTower.UNKNOWN)
		result.setMnc(mnc);
	if (result.getTac() == CellTower.UNKNOWN)
		result.setTac(cell.getLac());
	if (result.getCi() == CellTower.UNKNOWN)
		result.setCi(cell.getCid());
	if (result.getPci() == CellTower.UNKNOWN)
		result.setPci(cell.getPsc());
	this.put(result.getText(), result);
	this.put(result.getAltText(), result);
	Log.d(this.getClass().getSimpleName(), String.format("Added NeighboringCellInfo for %s, %d G, %d dBm",
			result.getText(),
			result.getGeneration(),
			result.getDbm()));
	return result;
}