PlatformNetworksManager.java 文件源码

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
private static Set<VisibleCell> getAllVisibleCellsPostJellyBeanMr1(
        TelephonyManager telephonyManager) {
    Set<VisibleCell> visibleCells = new HashSet<>();
    // Retrieve visible cell networks
    List<CellInfo> cellInfos = telephonyManager.getAllCellInfo();
    if (cellInfos == null) {
        return visibleCells;
    }

    long elapsedTime = sTimeProvider.getElapsedRealtime();
    long currentTime = sTimeProvider.getCurrentTime();
    for (int i = 0; i < cellInfos.size(); i++) {
        CellInfo cellInfo = cellInfos.get(i);
        VisibleCell visibleCell =
                getVisibleCellPostJellyBeanMr1(cellInfo, elapsedTime, currentTime);
        if (visibleCell.radioType() != VisibleCell.UNKNOWN_RADIO_TYPE) {
            visibleCells.add(visibleCell);
        }
    }
    return visibleCells;
}