날짜 표현 DateFormat, Custom Date Text View

Date today;
String output;
SimpleDateFormat formatter;

formatter = new SimpleDateFormat(pattern, currentLocale);
today = new Date();
output = formatter.format(today);
System.out.println(pattern + " " + output);

Customized Date and Time Formats

Pattern	Output
dd.MM.yy	30.06.09
yyyy.MM.dd G 'at' hh:mm:ss z	2009.06.30 AD at 08:29:36 PDT
EEE, MMM d, ''yy	Tue, Jun 30, '09
h:mm a	8:29 PM
H:mm	8:29
H:mm:ss:SSS	8:28:36:249
K:mm a,z	8:29 AM,PDT
yyyy.MMMMM.dd GGG hh:mm aaa	2009.June.30 AD 08:29 AM

Custom Date Text View

public class MDateView extends View {
 private final static String FORMAT_DEFULAT = "yyyy.MM.dd";

 private boolean isTickable = false;
 private boolean isColon = true;
 private Calendar mCalendar;
 private Runnable mTickerRunnable;
 private Handler mHandler;
 private String mFormat = FORMAT_DEFULAT;
 private String mDateString = "", mTimeString = "";
 private Paint mDatePaint, mTimePaint;

 public MDateView(Context context) {
  super(context);
  initClock(context);
 }

 public MDateView(Context context, AttributeSet attrs) {
  super(context, attrs);
  initClock(context);
 }

 private void initClock(Context context) {
  if (mCalendar == null) {
   mCalendar = Calendar.getInstance();
  }

  mDatePaint = new Paint(Paint.ANTI_ALIAS_FLAG);

  mDatePaint.setColor(Color.argb(255, 255, 255, 255));
  mDatePaint.setTextSize(18);
  mDatePaint.setTextAlign(Align.LEFT);

  mTimePaint = new Paint(Paint.ANTI_ALIAS_FLAG);

  mTimePaint.setColor(Color.argb(255, 255, 255, 255));
  mTimePaint.setTextSize(24);
  mTimePaint.setTextAlign(Align.LEFT);
 }

 @Override
 protected void onDraw(Canvas canvas) {
  canvas.drawText(mDateString, 5, 35, mDatePaint);

  int offsetX = 92;
  float time_X_Pos = (120 - mTimePaint.measureText(mTimeString, 0, mTimeString.length())) / 2.0f;// center align
  canvas.drawText(mTimeString, offsetX + time_X_Pos, 35, mTimePaint);

 }

 @Override
 protected void onAttachedToWindow() {
  super.onAttachedToWindow();
  isTickable = true;
  mHandler = new Handler();

  mTickerRunnable = new Runnable() {
   public void run() {
    if (!isTickable)
     return;

    mCalendar.setTimeInMillis(System.currentTimeMillis());
    mDateString = DateFormat.format(mFormat, mCalendar).toString();
    mTimeString = DateFormat.format("k" + (isColon ? ":" : " ") + "mm", mCalendar).toString();
    invalidate();

    long now = SystemClock.uptimeMillis();
    long next = now + (1000 - now % 1000);
    isColon = !isColon;
    mHandler.postAtTime(mTickerRunnable, next);
   }
  };
  mTickerRunnable.run();
 }

 @Override
 protected void onDetachedFromWindow() {
  super.onDetachedFromWindow();
  isTickable = false;
 }

 public void setFormat(String format) {
  if (mFormat == format)
   return;
  mFormat = format;
 }