小区广播接收流程

1.0、我们从frameworks/opt/telephony/src/java/com/android/internal/telephony/gsm/GsmCellBroadcastHandler.java makeGsmCellBroadcastHandler开始

/**
     * Create a new CellBroadcastHandler.
     * @param context the context to use for dispatching Intents
     * @return the new handler
     */
    public static GsmCellBroadcastHandler makeGsmCellBroadcastHandler(Context context,
            PhoneBase phone) {
        GsmCellBroadcastHandler handler = new GsmCellBroadcastHandler(context