观察者模式写的Log打印

public interface LogObserver {
    void printLog(LogBean log);
}

public interface LogObserverable {
    void registerObserver(LogObserver o);
    void removeObserver(LogObserver o);
    void notifyObserver(LogBean obj);
}

public class Plog implements LogObserverable{

    private static Plog plog;
    public synchronized static Plog getInstance(Context context) {
        if (plog == null) {
            synchronized (Plog.class){
                if(plog==null){
                    plog = new Plog(context);
                }
            }
        }
        return plog;
    }

    private Context context;
    public Plog(Context context) {
        this.context=context.getApplicationContext();
    }

    public void print(String TAG, String log){
        Log.v(TAG,log);
        LogBean bean=new LogBean();
        bean.log=log;
        notifyObserver(bean);
    }

    private List<LogObserver> observerList=new ArrayList<>();
    @Override
    public void registerObserver(LogObserver o) {
        observerList.add(o);
    }

    @Override
    public void removeObserver(LogObserver o) {
        observerList.remove(o);
    }

    @Override
    public void notifyObserver(LogBean log) {
        for(int i=0;i<observerList.size();i++){
            LogObserver logObserver=observerList.get(i);
            logObserver.printLog(log);
        }
    }
}

public class LogBean {
    String log;

    public String getLog() {
        return log;
    }

    public void setLog(String log) {
        this.log = log;
    }
}