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      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 
     17 package com.android.systemui.statusbar.policy;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.IntentFilter;
     23 import android.content.res.TypedArray;
     24 import android.icu.text.DateFormat;
     25 import android.icu.text.DisplayContext;
     26 import android.util.AttributeSet;
     27 import android.widget.TextView;
     28 
     29 import com.android.systemui.R;
     30 
     31 import java.text.SimpleDateFormat;
     32 import java.util.Date;
     33 import java.util.Locale;
     34 
     35 public class DateView extends TextView {
     36     private static final String TAG = "DateView";
     37 
     38     private final Date mCurrentTime = new Date();
     39 
     40     private DateFormat mDateFormat;
     41     private String mLastText;
     42     private String mDatePattern;
     43 
     44     private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
     45         @Override
     46         public void onReceive(Context context, Intent intent) {
     47             final String action = intent.getAction();
     48             if (Intent.ACTION_TIME_TICK.equals(action)
     49                     || Intent.ACTION_TIME_CHANGED.equals(action)
     50                     || Intent.ACTION_TIMEZONE_CHANGED.equals(action)
     51                     || Intent.ACTION_LOCALE_CHANGED.equals(action)) {
     52                 if (Intent.ACTION_LOCALE_CHANGED.equals(action)
     53                         || Intent.ACTION_TIMEZONE_CHANGED.equals(action)) {
     54                     // need to get a fresh date format
     55                     mDateFormat = null;
     56                 }
     57                 updateClock();
     58             }
     59         }
     60     };
     61 
     62     public DateView(Context context, AttributeSet attrs) {
     63         super(context, attrs);
     64         TypedArray a = context.getTheme().obtainStyledAttributes(
     65                 attrs,
     66                 R.styleable.DateView,
     67                 0, 0);
     68 
     69         try {
     70             mDatePattern = a.getString(R.styleable.DateView_datePattern);
     71         } finally {
     72             a.recycle();
     73         }
     74         if (mDatePattern == null) {
     75             mDatePattern = getContext().getString(R.string.system_ui_date_pattern);
     76         }
     77     }
     78 
     79     @Override
     80     protected void onAttachedToWindow() {
     81         super.onAttachedToWindow();
     82 
     83         IntentFilter filter = new IntentFilter();
     84         filter.addAction(Intent.ACTION_TIME_TICK);
     85         filter.addAction(Intent.ACTION_TIME_CHANGED);
     86         filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
     87         filter.addAction(Intent.ACTION_LOCALE_CHANGED);
     88         getContext().registerReceiver(mIntentReceiver, filter, null, null);
     89 
     90         updateClock();
     91     }
     92 
     93     @Override
     94     protected void onDetachedFromWindow() {
     95         super.onDetachedFromWindow();
     96 
     97         mDateFormat = null; // reload the locale next time
     98         getContext().unregisterReceiver(mIntentReceiver);
     99     }
    100 
    101     protected void updateClock() {
    102         if (mDateFormat == null) {
    103             final Locale l = Locale.getDefault();
    104             DateFormat format = DateFormat.getInstanceForSkeleton(mDatePattern, l);
    105             format.setContext(DisplayContext.CAPITALIZATION_FOR_STANDALONE);
    106             mDateFormat = format;
    107         }
    108 
    109         mCurrentTime.setTime(System.currentTimeMillis());
    110 
    111         final String text = mDateFormat.format(mCurrentTime);
    112         if (!text.equals(mLastText)) {
    113             setText(text);
    114             mLastText = text;
    115         }
    116     }
    117 }
    118