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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 类用于在接收到广播时初始化所有未触发的提醒闹钟。
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* 它会查询数据库中所有提醒日期晚于当前时间的便签，并为每个便签设置一个提醒闹钟。
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*/
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public class AlarmInitReceiver extends BroadcastReceiver {
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// 定义查询便签时需要返回的列
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private static final String [] PROJECTION = new String [] {
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NoteColumns.ID, // 便签的 ID
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NoteColumns.ALERTED_DATE // 便签的提醒日期
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};
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// 定义查询结果集中各列的索引
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private static final int COLUMN_ID = 0; // 便签 ID 列的索引
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private static final int COLUMN_ALERTED_DATE = 1; // 便签提醒日期列的索引
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/**
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* 当接收到广播时调用此方法。
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* 该方法会查询数据库中所有提醒日期晚于当前时间的便签，并为每个便签设置一个提醒闹钟。
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*
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* @param context 应用程序的上下文
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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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// 查询数据库中所有提醒日期晚于当前时间且类型为便签的记录
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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且便签类型为普通便签
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NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
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// 查询条件的参数，将当前时间作为参数传入
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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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// 移动到结果集的第一行
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if (c.moveToFirst()) {
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// 遍历结果集中的每一行
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do {
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// 获取当前便签的提醒日期
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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
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Intent sender = new Intent(context, AlarmReceiver.class);
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// 设置意图的数据为当前便签的 URI
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sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
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// 创建一个 PendingIntent，用于在提醒日期触发广播
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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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// 设置闹钟，在提醒日期唤醒设备并触发 PendingIntent
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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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} |
