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.database.ContentObserver;
21 import android.os.Handler;
22 import android.os.SystemClock;
23 import android.provider.Settings;
24 import android.text.format.DateFormat;
25 import android.util.AttributeSet;
26 
27 import java.util.Calendar;
28 
29 /**
30  * Like AnalogClock, but digital.
31  *
32  * @deprecated It is recommended you use {@link TextClock} instead.
33  */
34 @Deprecated
35 public class DigitalClock extends TextView {
36     // FIXME: implement separate views for hours/minutes/seconds, so
37     // proportional fonts don't shake rendering
38 
39     Calendar mCalendar;
40     @SuppressWarnings("FieldCanBeLocal") // We must keep a reference to this observer
41     private FormatChangeObserver mFormatChangeObserver;
42 
43     private Runnable mTicker;
44     private Handler mHandler;
45 
46     private boolean mTickerStopped = false;
47 
48     String mFormat;
49 
DigitalClock(Context context)50     public DigitalClock(Context context) {
51         super(context);
52         initClock();
53     }
54 
DigitalClock(Context context, AttributeSet attrs)55     public DigitalClock(Context context, AttributeSet attrs) {
56         super(context, attrs);
57         initClock();
58     }
59 
initClock()60     private void initClock() {
61         if (mCalendar == null) {
62             mCalendar = Calendar.getInstance();
63         }
64     }
65 
66     @Override
onAttachedToWindow()67     protected void onAttachedToWindow() {
68         mTickerStopped = false;
69         super.onAttachedToWindow();
70 
71         mFormatChangeObserver = new FormatChangeObserver();
72         getContext().getContentResolver().registerContentObserver(
73                 Settings.System.CONTENT_URI, true, mFormatChangeObserver);
74         setFormat();
75 
76         mHandler = new Handler();
77 
78         /**
79          * requests a tick on the next hard-second boundary
80          */
81         mTicker = new Runnable() {
82             public void run() {
83                 if (mTickerStopped) return;
84                 mCalendar.setTimeInMillis(System.currentTimeMillis());
85                 setText(DateFormat.format(mFormat, mCalendar));
86                 invalidate();
87                 long now = SystemClock.uptimeMillis();
88                 long next = now + (1000 - now % 1000);
89                 mHandler.postAtTime(mTicker, next);
90             }
91         };
92         mTicker.run();
93     }
94 
95     @Override
onDetachedFromWindow()96     protected void onDetachedFromWindow() {
97         super.onDetachedFromWindow();
98         mTickerStopped = true;
99         getContext().getContentResolver().unregisterContentObserver(
100                 mFormatChangeObserver);
101     }
102 
setFormat()103     private void setFormat() {
104         mFormat = DateFormat.getTimeFormatString(getContext());
105     }
106 
107     private class FormatChangeObserver extends ContentObserver {
FormatChangeObserver()108         public FormatChangeObserver() {
109             super(new Handler());
110         }
111 
112         @Override
onChange(boolean selfChange)113         public void onChange(boolean selfChange) {
114             setFormat();
115         }
116     }
117 
118     @Override
getAccessibilityClassName()119     public CharSequence getAccessibilityClassName() {
120         //noinspection deprecation
121         return DigitalClock.class.getName();
122     }
123 }
124