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
17package android.widget;
18
19import android.content.Context;
20import android.database.ContentObserver;
21import android.os.Handler;
22import android.os.SystemClock;
23import android.provider.Settings;
24import android.text.format.DateFormat;
25import android.util.AttributeSet;
26import android.view.accessibility.AccessibilityEvent;
27import android.view.accessibility.AccessibilityNodeInfo;
28
29import java.util.Calendar;
30
31/**
32 * Like AnalogClock, but digital.  Shows seconds.
33 *
34 * @deprecated It is recommended you use {@link TextClock} instead.
35 */
36@Deprecated
37public class DigitalClock extends TextView {
38    // FIXME: implement separate views for hours/minutes/seconds, so
39    // proportional fonts don't shake rendering
40
41    Calendar mCalendar;
42    @SuppressWarnings("FieldCanBeLocal") // We must keep a reference to this observer
43    private FormatChangeObserver mFormatChangeObserver;
44
45    private Runnable mTicker;
46    private Handler mHandler;
47
48    private boolean mTickerStopped = false;
49
50    String mFormat;
51
52    public DigitalClock(Context context) {
53        super(context);
54        initClock();
55    }
56
57    public DigitalClock(Context context, AttributeSet attrs) {
58        super(context, attrs);
59        initClock();
60    }
61
62    private void initClock() {
63        if (mCalendar == null) {
64            mCalendar = Calendar.getInstance();
65        }
66
67        mFormatChangeObserver = new FormatChangeObserver();
68        getContext().getContentResolver().registerContentObserver(
69                Settings.System.CONTENT_URI, true, mFormatChangeObserver);
70
71        setFormat();
72    }
73
74    @Override
75    protected void onAttachedToWindow() {
76        mTickerStopped = false;
77        super.onAttachedToWindow();
78        mHandler = new Handler();
79
80        /**
81         * requests a tick on the next hard-second boundary
82         */
83        mTicker = new Runnable() {
84            public void run() {
85                if (mTickerStopped) return;
86                mCalendar.setTimeInMillis(System.currentTimeMillis());
87                setText(DateFormat.format(mFormat, mCalendar));
88                invalidate();
89                long now = SystemClock.uptimeMillis();
90                long next = now + (1000 - now % 1000);
91                mHandler.postAtTime(mTicker, next);
92            }
93        };
94        mTicker.run();
95    }
96
97    @Override
98    protected void onDetachedFromWindow() {
99        super.onDetachedFromWindow();
100        mTickerStopped = true;
101    }
102
103    private void setFormat() {
104        mFormat = DateFormat.getTimeFormatString(getContext());
105    }
106
107    private class FormatChangeObserver extends ContentObserver {
108        public FormatChangeObserver() {
109            super(new Handler());
110        }
111
112        @Override
113        public void onChange(boolean selfChange) {
114            setFormat();
115        }
116    }
117
118    @Override
119    public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
120        super.onInitializeAccessibilityEvent(event);
121        //noinspection deprecation
122        event.setClassName(DigitalClock.class.getName());
123    }
124
125    @Override
126    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
127        super.onInitializeAccessibilityNodeInfo(info);
128        //noinspection deprecation
129        info.setClassName(DigitalClock.class.getName());
130    }
131}
132