The onDraw() method paints the watch face with all necessary information. Follow the comments in the code to make complete sense of the following code snippet:

@Override 
public void onDraw(Canvas canvas, Rect bounds)  
{ 
  long now = System.currentTimeMillis(); 
  mCalendar.setTimeInMillis(now); 
  mDate.setTime(now); 
  boolean is24Hour =  DateFormat.is24HourFormat(TodayWatchFaceService.this); 
 
  // Show colons for the first half of each second so the colons blink on when the time 
  // updates. 
  mShouldDrawColons = (System.currentTimeMillis() % 1000) < 500; 
 
  // Draw the background. 
  canvas.drawRect(0, 0, bounds.width(), bounds.height(), mBackgroundPaint); 
 
  // Draw the hours. 
  float x = mXOffset; 
  String hourString; 
  if (is24Hour)  
  { 
    hourString =  formatTwoDigitNumber(mCalendar.get(Calendar.HOUR_OF_DAY));   }  
  else  
  { 
    int hour = mCalendar.get(Calendar.HOUR); 
    if (hour == 0)  
    { 
      hour = 12; 
    } 
    hourString...