| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.widget; |
| |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.BroadcastReceiver; |
| import android.database.ContentObserver; |
| import android.net.Uri; |
| import android.os.Handler; |
| import android.text.format.Time; |
| import android.util.AttributeSet; |
| import android.util.Log; |
| import android.provider.Settings; |
| import android.widget.TextView; |
| import android.widget.RemoteViews.RemoteView; |
| |
| import java.text.DateFormat; |
| import java.text.SimpleDateFormat; |
| import java.util.Date; |
| |
| // |
| // TODO |
| // - listen for the next threshold time to update the view. |
| // - listen for date format pref changed |
| // - put the AM/PM in a smaller font |
| // |
| |
| /** |
| * Displays a given time in a convenient human-readable foramt. |
| * |
| * @hide |
| */ |
| @RemoteView |
| public class DateTimeView extends TextView { |
| private static final String TAG = "DateTimeView"; |
| |
| private static final long TWELVE_HOURS_IN_MINUTES = 12 * 60; |
| private static final long TWENTY_FOUR_HOURS_IN_MILLIS = 24 * 60 * 60 * 1000; |
| |
| private static final int SHOW_TIME = 0; |
| private static final int SHOW_MONTH_DAY_YEAR = 1; |
| |
| Date mTime; |
| long mTimeMillis; |
| |
| int mLastDisplay = -1; |
| DateFormat mLastFormat; |
| |
| private boolean mAttachedToWindow; |
| private long mUpdateTimeMillis; |
| |
| public DateTimeView(Context context) { |
| super(context); |
| } |
| |
| public DateTimeView(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| @Override |
| protected void onAttachedToWindow() { |
| super.onAttachedToWindow(); |
| registerReceivers(); |
| mAttachedToWindow = true; |
| } |
| |
| @Override |
| protected void onDetachedFromWindow() { |
| super.onDetachedFromWindow(); |
| unregisterReceivers(); |
| mAttachedToWindow = false; |
| } |
| |
| @android.view.RemotableViewMethod |
| public void setTime(long time) { |
| Time t = new Time(); |
| t.set(time); |
| t.second = 0; |
| mTimeMillis = t.toMillis(false); |
| mTime = new Date(t.year-1900, t.month, t.monthDay, t.hour, t.minute, 0); |
| update(); |
| } |
| |
| void update() { |
| if (mTime == null) { |
| return; |
| } |
| |
| long start = System.nanoTime(); |
| |
| int display; |
| Date time = mTime; |
| |
| Time t = new Time(); |
| t.set(mTimeMillis); |
| t.second = 0; |
| |
| t.hour -= 12; |
| long twelveHoursBefore = t.toMillis(false); |
| t.hour += 12; |
| long twelveHoursAfter = t.toMillis(false); |
| t.hour = 0; |
| t.minute = 0; |
| long midnightBefore = t.toMillis(false); |
| t.monthDay++; |
| long midnightAfter = t.toMillis(false); |
| |
| long nowMillis = System.currentTimeMillis(); |
| t.set(nowMillis); |
| t.second = 0; |
| nowMillis = t.normalize(false); |
| |
| // Choose the display mode |
| choose_display: { |
| if ((nowMillis >= midnightBefore && nowMillis < midnightAfter) |
| || (nowMillis >= twelveHoursBefore && nowMillis < twelveHoursAfter)) { |
| display = SHOW_TIME; |
| break choose_display; |
| } |
| // Else, show month day and year. |
| display = SHOW_MONTH_DAY_YEAR; |
| break choose_display; |
| } |
| |
| // Choose the format |
| DateFormat format; |
| if (display == mLastDisplay && mLastFormat != null) { |
| // use cached format |
| format = mLastFormat; |
| } else { |
| switch (display) { |
| case SHOW_TIME: |
| format = getTimeFormat(); |
| break; |
| case SHOW_MONTH_DAY_YEAR: |
| format = getDateFormat(); |
| break; |
| default: |
| throw new RuntimeException("unknown display value: " + display); |
| } |
| mLastFormat = format; |
| } |
| |
| // Set the text |
| String text = format.format(mTime); |
| setText(text); |
| |
| // Schedule the next update |
| if (display == SHOW_TIME) { |
| // Currently showing the time, update at the later of twelve hours after or midnight. |
| mUpdateTimeMillis = twelveHoursAfter > midnightAfter ? twelveHoursAfter : midnightAfter; |
| } else { |
| // Currently showing the date |
| if (mTimeMillis < nowMillis) { |
| // If the time is in the past, don't schedule an update |
| mUpdateTimeMillis = 0; |
| } else { |
| // If hte time is in the future, schedule one at the earlier of twelve hours |
| // before or midnight before. |
| mUpdateTimeMillis = twelveHoursBefore < midnightBefore |
| ? twelveHoursBefore : midnightBefore; |
| } |
| } |
| if (false) { |
| Log.d(TAG, "update needed for '" + time + "' at '" + new Date(mUpdateTimeMillis) |
| + "' - text=" + text); |
| } |
| |
| long finish = System.nanoTime(); |
| } |
| |
| private DateFormat getTimeFormat() { |
| return android.text.format.DateFormat.getTimeFormat(getContext()); |
| } |
| |
| private DateFormat getDateFormat() { |
| String format = Settings.System.getString(getContext().getContentResolver(), |
| Settings.System.DATE_FORMAT); |
| if (format == null || "".equals(format)) { |
| return DateFormat.getDateInstance(DateFormat.SHORT); |
| } else { |
| try { |
| return new SimpleDateFormat(format); |
| } catch (IllegalArgumentException e) { |
| // If we tried to use a bad format string, fall back to a default. |
| return DateFormat.getDateInstance(DateFormat.SHORT); |
| } |
| } |
| } |
| |
| private void registerReceivers() { |
| Context context = getContext(); |
| |
| IntentFilter filter = new IntentFilter(); |
| filter.addAction(Intent.ACTION_TIME_TICK); |
| filter.addAction(Intent.ACTION_TIME_CHANGED); |
| filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED); |
| filter.addAction(Intent.ACTION_TIMEZONE_CHANGED); |
| context.registerReceiver(mBroadcastReceiver, filter); |
| |
| Uri uri = Settings.System.getUriFor(Settings.System.DATE_FORMAT); |
| context.getContentResolver().registerContentObserver(uri, true, mContentObserver); |
| } |
| |
| private void unregisterReceivers() { |
| Context context = getContext(); |
| context.unregisterReceiver(mBroadcastReceiver); |
| context.getContentResolver().unregisterContentObserver(mContentObserver); |
| } |
| |
| private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| String action = intent.getAction(); |
| if (Intent.ACTION_TIME_TICK.equals(action)) { |
| if (System.currentTimeMillis() < mUpdateTimeMillis) { |
| // The update() function takes a few milliseconds to run because of |
| // all of the time conversions it needs to do, so we can't do that |
| // every minute. |
| return; |
| } |
| } |
| // ACTION_TIME_CHANGED can also signal a change of 12/24 hr. format. |
| mLastFormat = null; |
| update(); |
| } |
| }; |
| |
| private ContentObserver mContentObserver = new ContentObserver(new Handler()) { |
| @Override |
| public void onChange(boolean selfChange) { |
| mLastFormat = null; |
| update(); |
| } |
| }; |
| } |