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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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// 这里是文件的版权声明，说明代码版权归属于MiCode开源社区，并在Apache License 2.0下授权。
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package net.micode.notes.ui;
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// 声明代码所属的包名。
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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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// 导入所需的Android类和接口，以及应用内部的数据访问类。
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public class AlarmInitReceiver extends BroadcastReceiver {
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// 定义一个继承自BroadcastReceiver的类，用于处理广播事件。
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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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// 定义查询数据库时需要的列。
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private static final int COLUMN_ID = 0;
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private static final int COLUMN_ALERTED_DATE = 1;
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// 定义列索引常量。
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@Override
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public void onReceive(Context context, Intent intent) {
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// 实现onReceive方法，这是BroadcastReceiver的核心方法，用于处理接收到的广播。
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long currentDate = System.currentTimeMillis();
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// 获取当前时间的毫秒值。
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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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// 查询数据库，获取所有未提醒且类型为笔记的记录。
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if (c != null) {
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if (c.moveToFirst()) {
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do {
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long alertDate = c.getLong(COLUMN_ALERTED_DATE);
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// 获取每条记录的提醒日期。
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Intent sender = new Intent(context, AlarmReceiver.class);
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// 创建一个新的Intent，用于触发AlarmReceiver。
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sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
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// 设置Intent的数据，以便AlarmReceiver知道要处理哪个笔记。
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
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// 创建一个PendingIntent，用于AlarmManager设置闹钟。
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AlarmManager alermManager = (AlarmManager) context
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.getSystemService(Context.ALARM_SERVICE);
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// 获取AlarmManager服务。
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alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
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// 设置闹钟，当到达提醒日期时，AlarmManager将触发AlarmReceiver。
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} while (c.moveToNext());
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// 遍历查询结果，为每条记录设置闹钟。
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}
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c.close();
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// 关闭Cursor。
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}
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}
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} |
