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      1 /*
      2  * Copyright (C) 2006 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.widget;
     18 
     19 import android.content.Context;
     20 import android.content.res.Resources;
     21 import android.database.ContentObserver;
     22 import android.os.Handler;
     23 import android.os.SystemClock;
     24 import android.provider.Settings;
     25 import android.text.format.DateFormat;
     26 import android.util.AttributeSet;
     27 
     28 import java.util.Calendar;
     29 
     30 /**
     31  * Like AnalogClock, but digital.  Shows seconds.
     32  *
     33  * FIXME: implement separate views for hours/minutes/seconds, so
     34  * proportional fonts don't shake rendering
     35  */
     36 
     37 public class DigitalClock extends TextView {
     38 
     39     Calendar mCalendar;
     40     private final static String m12 = "h:mm:ss aa";
     41     private final static String m24 = "k:mm:ss";
     42     private FormatChangeObserver mFormatChangeObserver;
     43 
     44     private Runnable mTicker;
     45     private Handler mHandler;
     46 
     47     private boolean mTickerStopped = false;
     48 
     49     String mFormat;
     50 
     51     public DigitalClock(Context context) {
     52         super(context);
     53         initClock(context);
     54     }
     55 
     56     public DigitalClock(Context context, AttributeSet attrs) {
     57         super(context, attrs);
     58         initClock(context);
     59     }
     60 
     61     private void initClock(Context context) {
     62         Resources r = mContext.getResources();
     63 
     64         if (mCalendar == null) {
     65             mCalendar = Calendar.getInstance();
     66         }
     67 
     68         mFormatChangeObserver = new FormatChangeObserver();
     69         getContext().getContentResolver().registerContentObserver(
     70                 Settings.System.CONTENT_URI, true, mFormatChangeObserver);
     71 
     72         setFormat();
     73     }
     74 
     75     @Override
     76     protected void onAttachedToWindow() {
     77         mTickerStopped = false;
     78         super.onAttachedToWindow();
     79         mHandler = new Handler();
     80 
     81         /**
     82          * requests a tick on the next hard-second boundary
     83          */
     84         mTicker = new Runnable() {
     85                 public void run() {
     86                     if (mTickerStopped) return;
     87                     mCalendar.setTimeInMillis(System.currentTimeMillis());
     88                     setText(DateFormat.format(mFormat, mCalendar));
     89                     invalidate();
     90                     long now = SystemClock.uptimeMillis();
     91                     long next = now + (1000 - now % 1000);
     92                     mHandler.postAtTime(mTicker, next);
     93                 }
     94             };
     95         mTicker.run();
     96     }
     97 
     98     @Override
     99     protected void onDetachedFromWindow() {
    100         super.onDetachedFromWindow();
    101         mTickerStopped = true;
    102     }
    103 
    104     /**
    105      * Pulls 12/24 mode from system settings
    106      */
    107     private boolean get24HourMode() {
    108         return android.text.format.DateFormat.is24HourFormat(getContext());
    109     }
    110 
    111     private void setFormat() {
    112         if (get24HourMode()) {
    113             mFormat = m24;
    114         } else {
    115             mFormat = m12;
    116         }
    117     }
    118 
    119     private class FormatChangeObserver extends ContentObserver {
    120         public FormatChangeObserver() {
    121             super(new Handler());
    122         }
    123 
    124         @Override
    125         public void onChange(boolean selfChange) {
    126             setFormat();
    127         }
    128     }
    129 }
    130