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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; // 引入AlarmManager,用于设置系统闹铃
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import android.app.PendingIntent; // 引入PendingIntent,用于延迟执行的操作
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import android.content.BroadcastReceiver; // 引入广播接收器,监听系统广播
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import android.content.ContentUris; // 引入ContentUris,用于构造URI
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import android.content.Context; // 引入Context,用于访问应用环境
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import android.content.Intent; // 引入Intent,用于启动其他活动或服务
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import android.database.Cursor; // 引入Cursor,用于查询数据库结果
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import net.micode.notes.data.Notes; // 引入Notes类,表示笔记相关的数据模型
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import net.micode.notes.data.Notes.NoteColumns; // 引入NoteColumns类,表示笔记数据表的字段
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public class AlarmInitReceiver extends BroadcastReceiver {
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// 定义查询数据库时需要的字段,ID和警报日期
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private static final String [] PROJECTION = new String [] {
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NoteColumns.ID, // 笔记的ID
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NoteColumns.ALERTED_DATE // 笔记的警报日期
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};
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private static final int COLUMN_ID = 0; // 表示ID字段的索引
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private static final int COLUMN_ALERTED_DATE = 1; // 表示警报日期字段的索引
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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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// 查询数据库,获取那些警报日期大于当前时间的笔记
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Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI, // 笔记内容提供者的URI
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PROJECTION, // 查询的字段(ID和警报日期)
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NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE, // 查询条件:警报日期大于当前时间,且类型是笔记
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new String[] { String.valueOf(currentDate) }, // 当前时间作为查询条件
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null); // 排序方式为空
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// 如果查询结果不为空
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if (c != null) {
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// 如果数据库中存在符合条件的记录,遍历每条记录
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if (c.moveToFirst()) {
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do {
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long alertDate = c.getLong(COLUMN_ALERTED_DATE); // 获取当前笔记的警报日期
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// 创建一个Intent,指定接收广播的类
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Intent sender = new Intent(context, AlarmReceiver.class);
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// 设置Intent的Data为当前笔记的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,用于延迟发送广播
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
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// 获取系统的AlarmManager服务
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AlarmManager alermManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
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// 设置闹铃,使用RTC_WAKEUP触发闹铃,唤醒设备并在指定时间触发广播
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alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
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} while (c.moveToNext()); // 继续处理下一条记录
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}
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// 关闭游标,释放数据库资源
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c.close();
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}
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}
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}
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