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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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//用来接收来自系统和应用中的广播
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public class AlarmInitReceiver extends BroadcastReceiver {
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//声明PROJECTION，每个元素包括id和提醒日期
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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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//初始化闹钟提醒的ID号和提醒日期
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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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//AlarmInitReceiver的配置“android.intent.action.BOOT_COMPLETED”，表明
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// Android手机开机后，会发送android.intent.action.BOOT_COMPLETED广播，监听这个广播就能监听开机。
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// 开机之后，就处理已有的便签，逐条比较日期，如果有到期的，就用AlarmManager提醒用户。
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@Override
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//2. 接收广播后的处理方法,上下文context，消息传递工具intent
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public void onReceive(Context context, Intent intent) {
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//System.currentTimeMillis()产生一个当前的毫秒
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long currentDate = System.currentTimeMillis();
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//Cursor在这里的作用是通过查找数据库中的标签内容，找到和当前系统时间相等的标签
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Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
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PROJECTION,
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//获取的是当前时间大于设置提醒时间的便签项
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NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
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//类型转换，将long类型的currentDate转变为String类
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new String[] { String.valueOf(currentDate) },
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null);
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//如果在数据库中找到了这样的便签（提醒时间 > 现在时间），便将光标移到第一个，从头遍历,设立一个闹钟的机制
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if (c != null) {
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//游标移动到开始位置
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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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//通过定义一个Intent方法，与AlarmReceiver类建立连接
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Intent sender = new Intent(context, AlarmReceiver.class);
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// 设置新的便签的uri和id
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sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
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//设置闹钟 当提醒时间到达时发送Intent并且唤醒设备
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AlarmManager alermManager = (AlarmManager) context
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.getSystemService(Context.ALARM_SERVICE);
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alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
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} while (c.moveToNext());//游标移动到下一位置
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}
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c.close();
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}
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}
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}
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