ClockDraw.java

package nl.frankkie.randomapp;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.os.Bundle;
import android.view.View;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;

/**
 * Draw a XKCD Style clock
 *
 * @author FrankkieNL
 */
public class NowClockActivity extends Activity {

    MyClockView clockView;
    int yellowRingSize = 6; //as in x% from size
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState); //To change body of generated methods, choose Tools | Templates.
        initUI();
    }

    public void initUI() {
        clockView = new MyClockView(this);
        setContentView(clockView);
    }

    public class MyClockView extends View {

        public MyClockView(Context context) {
            super(context);
        }

        Paint paint = new Paint();
        RectF outerCircle = null;
        RectF innerCircle = null;
        Bitmap clockImage = null;

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);

            //Get maximum square drawing size, my using smallest dimension
            //Truesmart watch should have a square screen.
            int size = Math.min(canvas.getHeight(), canvas.getWidth());
            int center = size / 2;

            canvas.drawColor(Color.WHITE);
            //Lets paint a clock                        
            paint.setAntiAlias(true);

            //draw outer circle
            paint.setColor(Color.YELLOW);
            paint.setStyle(Paint.Style.FILL);
            if (outerCircle == null) {
                outerCircle = new RectF(0, 0, size, size);
            }
            canvas.drawOval(outerCircle, paint);

            //Draw hour-lines            
            paint.setColor(Color.BLACK);
            paint.setStyle(Paint.Style.STROKE);
            for (int i = 0; i < 24; i++) {
                float x = (float) Math.cos(Math.toRadians((360.0 / 24.0) * i)) * center + center;
                float y = (float) Math.sin(Math.toRadians((360.0 / 24.0) * i)) * center + center;
                canvas.drawLine(center, center, x, y, paint);
            }

            //draw inner circle
            paint.setColor(Color.WHITE);
            paint.setStyle(Paint.Style.FILL);
            if (innerCircle == null) {
                innerCircle = new RectF(size / 10, size / 10, size - size / 10, size - size / 10);
            }
            canvas.drawOval(innerCircle, paint);

            //draw earth                    
            if (clockImage == null) {
                Resources res = getResources();
                clockImage = BitmapFactory.decodeResource(res, R.drawable.nowclock_earth);
            }
            float timeDegrees = 0;
            Calendar c = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
            int hour = c.get(Calendar.HOUR_OF_DAY); //24
            int min = c.get(Calendar.MINUTE); //60
            timeDegrees += (360.0/24.0)*(hour+12); //do make sure we count from noon, not from midnight
            timeDegrees += ((360.0/24.0)/60.0)*min;
            canvas.rotate(timeDegrees, center, center);
            canvas.drawBitmap(clockImage, null, new Rect(size / 10, size / 10, size - size / 10, size - size / 10), paint);
            canvas.rotate(-timeDegrees, center, center);
        }

    }
}