DigitalClock.java revision e3ea6e3d4c8a8c2dc71f608a74ed9f6137afe63d 
1/*
2 * Copyright (C) 2008 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 com.android.internal.widget;
18
19import com.android.internal.R;
20
21import android.content.BroadcastReceiver;
22import android.content.Context;
23import android.content.Intent;
24import android.content.IntentFilter;
25import android.content.res.Resources;
26import android.database.ContentObserver;
27import android.graphics.Typeface;
28import android.os.Handler;
29import android.provider.Settings;
30import android.text.format.DateFormat;
31import android.util.AttributeSet;
32import android.view.View;
33import android.widget.LinearLayout;
34import android.widget.TextView;
35
36import java.text.DateFormatSymbols;
37import java.util.Calendar;
38
39/**
40 * Displays the time
41 */
42public class DigitalClock extends LinearLayout {
43
44    private final static String M12 = "h:mm";
45    private final static String M24 = "kk:mm";
46
47    private Calendar mCalendar;
48    private String mFormat;
49    private TextView mTimeDisplay;
50    private AmPm mAmPm;
51    private ContentObserver mFormatChangeObserver;
52    private boolean mLive = true;
53    private boolean mAttached;
54
55    /* called by system on minute ticks */
56    private final Handler mHandler = new Handler();
57    private final BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
58            @Override
59            public void onReceive(Context context, Intent intent) {
60                if (mLive && intent.getAction().equals(
61                            Intent.ACTION_TIMEZONE_CHANGED)) {
62                    mCalendar = Calendar.getInstance();
63                }
64                updateTime();
65            }
66        };
67
68    static class AmPm {
69        private TextView mAmPm;
70        private String mAmString, mPmString;
71
72        AmPm(View parent, Typeface tf) {
73            mAmPm = (TextView) parent.findViewById(R.id.am_pm);
74            if (tf != null) {
75                mAmPm.setTypeface(tf);
76            }
77
78            String[] ampm = new DateFormatSymbols().getAmPmStrings();
79            mAmString = ampm[0];
80            mPmString = ampm[1];
81        }
82
83        void setShowAmPm(boolean show) {
84            mAmPm.setVisibility(show ? View.VISIBLE : View.GONE);
85        }
86
87        void setIsMorning(boolean isMorning) {
88            mAmPm.setText(isMorning ? mAmString : mPmString);
89        }
90    }
91
92    private class FormatChangeObserver extends ContentObserver {
93        public FormatChangeObserver() {
94            super(new Handler());
95        }
96        @Override
97        public void onChange(boolean selfChange) {
98            setDateFormat();
99            updateTime();
100        }
101    }
102
103    public DigitalClock(Context context) {
104        this(context, null);
105    }
106
107    public DigitalClock(Context context, AttributeSet attrs) {
108        super(context, attrs);
109    }
110
111    @Override
112    protected void onFinishInflate() {
113        super.onFinishInflate();
114
115        mTimeDisplay = (TextView) findViewById(R.id.timeDisplay);
116        mTimeDisplay.setTypeface(Typeface.createFromFile("/system/fonts/Clockopia.ttf"));
117        mAmPm = new AmPm(this, Typeface.createFromFile("/system/fonts/DroidSans-Bold.ttf"));
118        mCalendar = Calendar.getInstance();
119
120        setDateFormat();
121    }
122
123    @Override
124    protected void onAttachedToWindow() {
125        super.onAttachedToWindow();
126
127        if (mAttached) return;
128        mAttached = true;
129
130        if (mLive) {
131            /* monitor time ticks, time changed, timezone */
132            IntentFilter filter = new IntentFilter();
133            filter.addAction(Intent.ACTION_TIME_TICK);
134            filter.addAction(Intent.ACTION_TIME_CHANGED);
135            filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
136            mContext.registerReceiver(mIntentReceiver, filter, null, mHandler);
137        }
138
139        /* monitor 12/24-hour display preference */
140        mFormatChangeObserver = new FormatChangeObserver();
141        mContext.getContentResolver().registerContentObserver(
142                Settings.System.CONTENT_URI, true, mFormatChangeObserver);
143
144        updateTime();
145    }
146
147    @Override
148    protected void onDetachedFromWindow() {
149        super.onDetachedFromWindow();
150
151        if (!mAttached) return;
152        mAttached = false;
153
154        if (mLive) {
155            mContext.unregisterReceiver(mIntentReceiver);
156        }
157        mContext.getContentResolver().unregisterContentObserver(
158                mFormatChangeObserver);
159    }
160
161
162    void updateTime(Calendar c) {
163        mCalendar = c;
164        updateTime();
165    }
166
167    private void updateTime() {
168        if (mLive) {
169            mCalendar.setTimeInMillis(System.currentTimeMillis());
170        }
171
172        CharSequence newTime = DateFormat.format(mFormat, mCalendar);
173        mTimeDisplay.setText(newTime);
174        mAmPm.setIsMorning(mCalendar.get(Calendar.AM_PM) == 0);
175    }
176
177    private void setDateFormat() {
178        mFormat = android.text.format.DateFormat.is24HourFormat(getContext())
179            ? M24 : M12;
180        mAmPm.setShowAmPm(mFormat.equals(M12));
181    }
182
183    void setLive(boolean live) {
184        mLive = live;
185    }
186}
187