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;
26
27import java.util.Calendar;
28
29/**
30 * Like AnalogClock, but digital.  Shows seconds.
31 *
32 * @deprecated It is recommended you use {@link TextClock} instead.
33 */
34@Deprecated
35public 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
50    public DigitalClock(Context context) {
51        super(context);
52        initClock();
53    }
54
55    public DigitalClock(Context context, AttributeSet attrs) {
56        super(context, attrs);
57        initClock();
58    }
59
60    private void initClock() {
61        if (mCalendar == null) {
62            mCalendar = Calendar.getInstance();
63        }
64    }
65
66    @Override
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
96    protected void onDetachedFromWindow() {
97        super.onDetachedFromWindow();
98        mTickerStopped = true;
99        getContext().getContentResolver().unregisterContentObserver(
100                mFormatChangeObserver);
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 CharSequence getAccessibilityClassName() {
120        //noinspection deprecation
121        return DigitalClock.class.getName();
122    }
123}
124