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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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// 声明包名
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package net.micode.notes.ui;
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// 导入所需的Android和自定义类
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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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// 定义一个继承自BroadcastReceiver的类，用于初始化闹钟
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public class AlarmInitReceiver extends BroadcastReceiver {
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// 定义查询数据库时需要的列
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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 // 笔记的提醒日期
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};
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// 定义列索引，用于从Cursor中获取数据
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private static final int COLUMN_ID = 0; // ID列的索引
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private static final int COLUMN_ALERTED_DATE = 1; // 提醒日期列的索引
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// 当接收到广播时调用此方法
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@Override
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public void onReceive(Context context, Intent intent) {
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long currentDate = System.currentTimeMillis(); // 获取当前时间
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// 从内容提供者中查询需要提醒的笔记，条件是提醒日期大于当前时间且笔记类型为普通笔记
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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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if (c != null) {
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if (c.moveToFirst()) { // 移动到查询结果的第一条记录
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do {
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long alertDate = c.getLong(COLUMN_ALERTED_DATE); // 获取提醒日期
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// 创建一个Intent，用于在提醒时间到达时广播
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Intent sender = new Intent(context, AlarmReceiver.class);
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// 设置Intent的URI，包含笔记的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AlarmManager在提醒时间到达时启动
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
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// 获取AlarmManager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，在提醒时间到达时广播Intent
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alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
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} while (c.moveToNext()); // 处理查询结果中的下一条记录
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}
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c.close(); // 关闭Cursor
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}
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}
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} |
