DateView.java revision 6090995951c6e2e4dcf38102f01793f8a94166e1 
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.systemui.statusbar.policy;
18
19import android.content.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.IntentFilter;
23import android.util.AttributeSet;
24import android.widget.TextView;
25
26import com.android.systemui.R;
27
28import java.text.SimpleDateFormat;
29import java.util.Date;
30import java.util.Locale;
31
32import libcore.icu.ICU;
33
34public class DateView extends TextView {
35    private static final String TAG = "DateView";
36
37    private final Date mCurrentTime = new Date();
38
39    private SimpleDateFormat mDateFormat;
40    private String mLastText;
41
42    private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
43        @Override
44        public void onReceive(Context context, Intent intent) {
45            final String action = intent.getAction();
46            if (Intent.ACTION_TIME_TICK.equals(action)
47                    || Intent.ACTION_TIME_CHANGED.equals(action)
48                    || Intent.ACTION_TIMEZONE_CHANGED.equals(action)
49                    || Intent.ACTION_LOCALE_CHANGED.equals(action)) {
50                if (Intent.ACTION_LOCALE_CHANGED.equals(action)
51                        || Intent.ACTION_TIMEZONE_CHANGED.equals(action)) {
52                    // need to get a fresh date format
53                    mDateFormat = null;
54                }
55                updateClock();
56            }
57        }
58    };
59
60    public DateView(Context context, AttributeSet attrs) {
61        super(context, attrs);
62    }
63
64    @Override
65    protected void onAttachedToWindow() {
66        super.onAttachedToWindow();
67
68        IntentFilter filter = new IntentFilter();
69        filter.addAction(Intent.ACTION_TIME_TICK);
70        filter.addAction(Intent.ACTION_TIME_CHANGED);
71        filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
72        filter.addAction(Intent.ACTION_LOCALE_CHANGED);
73        mContext.registerReceiver(mIntentReceiver, filter, null, null);
74
75        updateClock();
76    }
77
78    @Override
79    protected void onDetachedFromWindow() {
80        super.onDetachedFromWindow();
81
82        mDateFormat = null; // reload the locale next time
83        mContext.unregisterReceiver(mIntentReceiver);
84    }
85
86    protected void updateClock() {
87        if (mDateFormat == null) {
88            final String dateFormat = getContext().getString(R.string.system_ui_date_pattern);
89            final Locale l = Locale.getDefault();
90            final String fmt = ICU.getBestDateTimePattern(dateFormat, l.toString());
91            mDateFormat = new SimpleDateFormat(fmt, l);
92        }
93
94        mCurrentTime.setTime(System.currentTimeMillis());
95
96        final String text = mDateFormat.format(mCurrentTime);
97        if (!text.equals(mLastText)) {
98            setText(text);
99            mLastText = text;
100        }
101    }
102}
103