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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* 文件: AlarmInitReceiver.java
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* 描述: 便签提醒初始化广播接收器
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* 作用: 在系统启动或应用启动时，重新初始化所有未触发的便签提醒
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* 功能:
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* 1. 监听系统启动广播
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* 2. 查询数据库中所有未触发的提醒
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* 3. 为每个未触发的提醒重新设置闹钟
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*/
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package net.micode.notes.ui;
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import android.app.AlarmManager;
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import android.app.PendingIntent;
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import android.content.BroadcastReceiver;
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import android.content.ContentUris;
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import android.content.Context;
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import android.content.Intent;
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import android.database.Cursor;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.NoteColumns;
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/**
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* 便签提醒初始化广播接收器类
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*
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* 负责在系统启动或应用启动时，重新初始化所有未触发的便签提醒。
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* 通过查询数据库中的提醒时间，为每个未触发的提醒重新设置系统闹钟。
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* 这确保了即使在设备重启后，便签提醒功能仍然正常工作。
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*/
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public class AlarmInitReceiver extends BroadcastReceiver {
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/**
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* 数据库查询投影，定义需要获取的列
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*/
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private static final String [] PROJECTION = new String [] {
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NoteColumns.ID, // 便签ID
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NoteColumns.ALERTED_DATE // 提醒时间
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};
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/** 便签ID列索引 */
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private static final int COLUMN_ID = 0;
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/** 提醒时间列索引 */
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private static final int COLUMN_ALERTED_DATE = 1;
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/**
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* 接收广播时的回调方法
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* 当系统启动完成时，重新初始化所有未触发的便签提醒
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*
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* @param context 上下文环境
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* @param intent 接收到的广播意图
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*/
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@Override
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public void onReceive(Context context, Intent intent) {
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// 获取当前系统时间
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long currentDate = System.currentTimeMillis();
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// 查询所有未触发的提醒（提醒时间大于当前时间，且类型为便签）
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Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
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PROJECTION,
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NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
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new String[] { String.valueOf(currentDate) },
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null);
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if (c != null) {
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// 如果有未触发的提醒
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if (c.moveToFirst()) {
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do {
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// 获取提醒时间
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long alertDate = c.getLong(COLUMN_ALERTED_DATE);
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// 创建用于触发AlarmReceiver的Intent
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Intent sender = new Intent(context, AlarmReceiver.class);
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// 设置Intent的数据为便签的URI
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sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
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// 创建PendingIntent，用于延迟触发
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
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// 获取系统闹钟服务
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AlarmManager alermManager = (AlarmManager) context
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.getSystemService(Context.ALARM_SERVICE);
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// 设置闹钟，在提醒时间触发，并唤醒设备
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alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
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} while (c.moveToNext());
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}
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// 关闭游标，释放资源
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c.close();
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}
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}
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}
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