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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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* AlarmInitReceiver 类是一个广播接收器，用于在接收到特定广播时，
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* 初始化所有已设置且未触发的提醒闹钟。
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*/
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public class AlarmInitReceiver extends BroadcastReceiver {
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// 定义查询笔记时需要的列，包括笔记的 ID 和提醒日期
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private static final String [] PROJECTION = new String [] {
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NoteColumns.ID,
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NoteColumns.ALERTED_DATE
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};
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// 定义查询结果中笔记 ID 所在的列索引
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private static final int COLUMN_ID = 0;
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// 定义查询结果中提醒日期所在的列索引
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private static final int COLUMN_ALERTED_DATE = 1;
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/**
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* 当接收到广播时，此方法会被调用。
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* 它会查询所有设置了提醒且提醒日期在当前时间之后的笔记，
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* 并为每个笔记设置一个闹钟。
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*
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* @param context 上下文对象，用于访问系统服务和内容提供者
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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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// 获取当前时间的毫秒数
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long currentDate = System.currentTimeMillis();
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// 查询所有设置了提醒且提醒日期在当前时间之后的笔记
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Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
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PROJECTION,
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// 查询条件：提醒日期大于当前时间，并且笔记类型为普通笔记
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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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// 如果查询结果不为空
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if (c != null) {
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// 将游标移动到第一行
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if (c.moveToFirst()) {
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// 循环遍历查询结果的每一行
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do {
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// 获取当前笔记的提醒日期
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long alertDate = c.getLong(COLUMN_ALERTED_DATE);
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// 创建一个新的意图，用于触发 AlarmReceiver 广播接收器
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Intent sender = new Intent(context, AlarmReceiver.class);
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// 设置意图的数据，包含笔记的 URI 和 ID
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sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
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// 创建一个 PendingIntent，用于在闹钟触发时发送广播
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
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// 获取系统的闹钟服务
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AlarmManager alermManager = (AlarmManager) context
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.getSystemService(Context.ALARM_SERVICE);
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// 设置一个 RTC_WAKEUP 类型的闹钟，在提醒日期触发时唤醒设备
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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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} |
