@Override
    public void println(int priority, String tag, String msg, Throwable tr) {
        // There actually are log methods that don't take a msg parameter.  For now,
        // if that's the case, just convert null to the empty string and move on.
        String useMsg = msg;
        if (useMsg == null) {
            useMsg = "";
        }

        // If an exeption was provided, convert that exception to a usable string and attach
        // it to the end of the msg method.
        if (tr != null) {
            msg += "\n" + Log.getStackTraceString(tr);
        }

        // This is functionally identical to Log.x(tag, useMsg);
        // For instance, if priority were Log.VERBOSE, this would be the same as Log.v(tag, useMsg)
        Log.println(priority, tag, useMsg);

        // If this isn't the last node in the chain, move things along.
        if (mNext != null) {
            mNext.println(priority, tag, msg, tr);
        }
    }
Prints data out to the console using Android's native log mechanism.
@param priority Log level of the data being logged.  Verbose, Error, etc.
@param tag Tag for for the log data.  Can be used to organize log statements.
@param msg The actual message to be logged. The actual message to be logged.
@param tr If an exception was thrown, this can be sent along for the logging facilities
          to extract and print useful information.
SwipeRefreshMultipleViews/Application/src/main/java/com/example/android/common/logger/LogWrapper.java