public void setNext(LogNode node) {
        mNext = node;
    }
Formats the log data and prints it out to the LogView.
@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/LogView.java