public static void init(LogConfiguration logConfiguration, Printer... printers) {
        if (sIsInitialized) {
            // Platform.get().warn("XLog is already initialized, do not initialize again");
        }
        sIsInitialized = true;

        if (logConfiguration == null) {
            throw new IllegalArgumentException("Please specify a LogConfiguration");
        }
        sLogConfiguration = logConfiguration;

        sPrinter = new PrinterSet(printers);

        sLogger = new Logger(sLogConfiguration, sPrinter);
    }
Initialize log system, should be called only once.

@param logConfiguration the log configuration
@param printers         the printers, each log would be printed by all of the printers
@since 1.3.0
android/android_framework/base/src/main/java/com/elvishew/xlog/XLog.java