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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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public class AlarmInitReceiver extends BroadcastReceiver {
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// 定义查询笔记的列，只查询 ID 和 ALERTED_DATE
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private static final String [] PROJECTION = new String [] {
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NoteColumns.ID, // 笔记 ID
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NoteColumns.ALERTED_DATE // 警报时间（即提醒时间）
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};
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// 对应查询结果的列索引
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private static final int COLUMN_ID = 0; // 笔记 ID 列索引
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private static final int COLUMN_ALERTED_DATE = 1; // 警报时间列索引
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// 当广播接收时触发此方法
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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
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long currentDate = System.currentTimeMillis();
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// 查询数据库中需要触发警报的笔记，警报时间大于当前时间的笔记
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Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
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PROJECTION, // 查询的列
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NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE, // 查询条件，警报时间 > 当前时间，且是笔记类型
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new String[] { String.valueOf(currentDate) }, // 条件中的当前时间
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null); // 不需要排序
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// 如果查询结果不为空
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if (c != null) {
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// 如果查询结果有数据
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if (c.moveToFirst()) {
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do {
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// 获取警报时间
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long alertDate = c.getLong(COLUMN_ALERTED_DATE);
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// 创建一个新的 Intent，用于广播 AlarmReceiver
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Intent sender = new Intent(context, AlarmReceiver.class);
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// 设置 Intent 的数据为当前笔记的 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，用于设置警报
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
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// 获取 AlarmManager 实例
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AlarmManager alermManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
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// 设置警报：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()); // 如果还有下一条记录，继续处理
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}
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// 关闭数据库游标
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c.close();
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}
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}
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}
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