DateView.java revision 8949b2480b8d4c99aa7d20508522a42421a9acef 
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.view.View;
25import android.view.ViewParent;
26import android.widget.TextView;
27
28import com.android.systemui.R;
29
30import java.text.SimpleDateFormat;
31import java.util.Date;
32import java.util.Locale;
33
34import libcore.icu.ICU;
35
36public class DateView extends TextView {
37    private static final String TAG = "DateView";
38
39    private boolean mAttachedToWindow;
40    private boolean mWindowVisible;
41    private boolean mUpdating;
42
43    private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
44        @Override
45        public void onReceive(Context context, Intent intent) {
46            final String action = intent.getAction();
47            if (Intent.ACTION_TIME_TICK.equals(action)
48                    || Intent.ACTION_TIME_CHANGED.equals(action)
49                    || Intent.ACTION_TIMEZONE_CHANGED.equals(action)
50                    || Intent.ACTION_LOCALE_CHANGED.equals(action)) {
51                updateClock();
52            }
53        }
54    };
55
56    public DateView(Context context, AttributeSet attrs) {
57        super(context, attrs);
58    }
59
60    @Override
61    protected void onAttachedToWindow() {
62        super.onAttachedToWindow();
63        mAttachedToWindow = true;
64        setUpdates();
65    }
66
67    @Override
68    protected void onDetachedFromWindow() {
69        super.onDetachedFromWindow();
70        mAttachedToWindow = false;
71        setUpdates();
72    }
73
74    @Override
75    protected void onWindowVisibilityChanged(int visibility) {
76        super.onWindowVisibilityChanged(visibility);
77        mWindowVisible = visibility == VISIBLE;
78        setUpdates();
79    }
80
81    @Override
82    protected void onVisibilityChanged(View changedView, int visibility) {
83        super.onVisibilityChanged(changedView, visibility);
84        setUpdates();
85    }
86
87    @Override
88    protected int getSuggestedMinimumWidth() {
89        // makes the large background bitmap not force us to full width
90        return 0;
91    }
92
93    protected void updateClock() {
94        final String dateFormat = getContext().getString(R.string.system_ui_date_pattern);
95        final Locale l = Locale.getDefault();
96        String fmt = ICU.getBestDateTimePattern(dateFormat, l.toString());
97        SimpleDateFormat sdf = new SimpleDateFormat(fmt, l);
98        setText(sdf.format(new Date()));
99    }
100
101    private boolean isVisible() {
102        View v = this;
103        while (true) {
104            if (v.getVisibility() != VISIBLE) {
105                return false;
106            }
107            final ViewParent parent = v.getParent();
108            if (parent instanceof View) {
109                v = (View)parent;
110            } else {
111                return true;
112            }
113        }
114    }
115
116    private void setUpdates() {
117        boolean update = mAttachedToWindow && mWindowVisible && isVisible();
118        if (update != mUpdating) {
119            mUpdating = update;
120            if (update) {
121                // Register for Intent broadcasts for the clock and battery
122                IntentFilter filter = new IntentFilter();
123                filter.addAction(Intent.ACTION_TIME_TICK);
124                filter.addAction(Intent.ACTION_TIME_CHANGED);
125                filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
126                filter.addAction(Intent.ACTION_LOCALE_CHANGED);
127                mContext.registerReceiver(mIntentReceiver, filter, null, null);
128                updateClock();
129            } else {
130                mContext.unregisterReceiver(mIntentReceiver);
131            }
132        }
133    }
134}
135