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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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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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* 便签提醒初始化接收器
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* 用于在系统启动或特定事件触发时，重新注册所有未过期的便签提醒闹钟
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* 确保用户设置的便签提醒不会因系统重启等原因丢失
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*/
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public class AlarmInitReceiver extends BroadcastReceiver {
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/**
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* 数据库查询字段投影：只查询便签ID和提醒时间
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* 优化查询效率，避免获取不必要的字段
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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 // 提醒时间戳
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};
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// 字段索引常量，用于快速访问Cursor中的数据
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private static final int COLUMN_ID = 0; // 便签ID在投影中的索引
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private static final int COLUMN_ALERTED_DATE = 1; // 提醒时间在投影中的索引
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/**
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* 接收广播时触发的回调方法
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* 负责查询所有未过期的便签提醒，并重新注册到AlarmManager
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* @param context 上下文对象
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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，用于筛选未过期的提醒
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long currentDate = System.currentTimeMillis();
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// 查询数据库中所有未过期的便签提醒
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// 条件：提醒时间 > 当前时间 且 便签类型为普通便签（TYPE_NOTE）
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Cursor c = context.getContentResolver().query(
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Notes.CONTENT_NOTE_URI, // 查询的内容URI（指向便签表）
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PROJECTION, // 需要查询的字段
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NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
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new String[] { String.valueOf(currentDate) }, // 筛选条件参数（当前时间）
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null // 排序方式（无需排序）
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);
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if (c != null) {
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// 遍历查询结果，为每个未过期的提醒注册闹钟
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if (c.moveToFirst()) {
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do {
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// 获取便签的提醒时间
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long alertDate = c.getLong(COLUMN_ALERTED_DATE);
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// 创建触发提醒时的意图（指向AlarmReceiver）
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Intent sender = new Intent(context, AlarmReceiver.class);
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// 为意图附加便签ID，便于后续定位具体便签
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sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
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c.getLong(COLUMN_ID)));
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// 创建延迟执行的PendingIntent（用于触发提醒）
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PendingIntent pendingIntent = PendingIntent.getBroadcast(
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context, 0, sender, 0);
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// 获取AlarmManager服务，用于设置系统闹钟
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AlarmManager alermManager = (AlarmManager) context
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.getSystemService(Context.ALARM_SERVICE);
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// 注册闹钟：在指定时间（alertDate）唤醒设备并发送广播
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// RTC_WAKEUP模式确保在设备休眠时也能触发
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alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
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} while (c.moveToNext()); // 继续处理下一个便签
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}
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// 关闭Cursor，释放资源
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c.close();
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}
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}
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} |
