CellBackendHelper.java 文件源码

@SuppressWarnings("deprecation")
private synchronized void fallbackScan() {
    if (lastScan + MIN_UPDATE_INTERVAL > System.currentTimeMillis()) return;
    List<CellInfo> allCellInfo = telephonyManager.getAllCellInfo();
    if ((allCellInfo == null || allCellInfo.isEmpty()) && telephonyManager.getNetworkType() > 0) {
        allCellInfo = new ArrayList<CellInfo>();
        CellLocation cellLocation = telephonyManager.getCellLocation();
        CellInfo cellInfo = fromCellLocation(cellLocation);
        if (cellInfo != null) allCellInfo.add(cellInfo);
    }
    onCellsChanged(allCellInfo);
}