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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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private static final String [] PROJECTION = new String [] {
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NoteColumns.ID,
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NoteColumns.ALERTED_DATE
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};//定义了一个字符串数组
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private static final int COLUMN_ID = 0;//一栏的id
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private static final int COLUMN_ALERTED_DATE = 1;//一栏的闹钟响的日期
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@Override
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public void onReceive(Context context, Intent intent) {/*
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每个receiver类都必须重写父类Receiver的onReceive方法，对接收到的广播进行处理
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*/
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long currentDate = System.currentTimeMillis();//获取当前时间，毫秒为单位
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Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,//URI代表数据库的中的某个表
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PROJECTION,//要查询的列
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NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,/*
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where 后面的条件，？为占位符，selectionArgs参数替代占位符
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*/
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new String[] { String.valueOf(currentDate) },//替代占位符的
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null);//order by 排序，当前null默认升序
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/* 内容解析器提供的query（查询）方法，会将参数转化为一条select语句，用于在数据库中进行操作，返回的结果，相当于游标的缓冲区，
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cursor为指向每行的游标指针
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*/
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if (c != null) {//查询结果成功
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if (c.moveToFirst()) {//移动到第一行
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do {
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long alertDate = c.getLong(COLUMN_ALERTED_DATE);//将COLUMN_ALERTED_DATE列的值转化为long赋值给变量
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Intent sender = new Intent(context, AlarmReceiver.class);//向AlarmReceiver类传递intent对象
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sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));/*
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设置sender对象的data的URI，向给定的URI路径末尾添加一个id,有id后的URI代表那个id指向的资源
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*/
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);/*
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调用PendingIntent.getBroadcast方法，以获得一个PendingIntent对象，激发该对象时，该对象会启动一个它能启动组件，
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只能是activity，service，broadcast这3个组件，当前是创建了一个激发时能启动broadcast的对象，广播传递的intent
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是sender
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*/
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AlarmManager alermManager = (AlarmManager) context
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.getSystemService(Context.ALARM_SERVICE);//通过系统服务来获得当前的闹钟管理器
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alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);/*
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设置闹钟，闹钟类型是使用现实时间的闹钟，会唤醒系统进行提示 响，设置了响的时间，响时会传递的消息
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*/
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} while (c.moveToNext());//c指向下一行
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}
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c.close();//关闭游标
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}
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}
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}
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