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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 [] { // 声明一个私有静态变量PROJECTION，它是一个字符串数组，其中包含NoteColumns.ID和NoteColumns.ALERTED_DATE两个字符串
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NoteColumns.ID,
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NoteColumns.ALERTED_DATE
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};
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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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@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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Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI, //查询数据库中alerted_date大于当前时间，type为note的记录
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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()) {
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do {
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long alertDate = c.getLong(COLUMN_ALERTED_DATE); //获取alerted_date
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Intent sender = new Intent(context, AlarmReceiver.class); //创建一个Intent，用于传递数据
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sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID))); //将id传递给AlarmReceiver
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PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0); //创建一个PendingIntent，用于传递Intent
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AlarmManager alermManager = (AlarmManager) context //获取AlarmManager实例
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.getSystemService(Context.ALARM_SERVICE);
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alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent); //设置定时器，在alerted_date时间点，发送pendingIntent
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} while (c.moveToNext());
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}
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c.close();
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}
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}
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} |
