xiaomi-Notes/AlarmInitReceiver.java

/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.micode.notes.ui;

// 导入所需的Android类
import android.app.AlarmManager; // 用于管理闹钟服务
import android.app.PendingIntent; // 用于延迟执行的意图
import android.content.BroadcastReceiver; // 广播接收器基类
import android.content.ContentUris; // 用于处理内容URI
import android.content.Context; // 上下文类
import android.content.Intent; // 意图类
import android.database.Cursor; // 数据库结果集游标

// 导入笔记相关的数据类
import net.micode.notes.data.Notes; // 笔记数据类
import net.micode.notes.data.Notes.NoteColumns; // 笔记列定义类


public class AlarmInitReceiver extends BroadcastReceiver {

    // 定义要查询的列
    private static final String [] PROJECTION = new String [] {
        NoteColumns.ID,            
        // 笔记ID
        NoteColumns.ALERTED_DATE   
        // 警报日期
    };

    // 列索引
    private static final int COLUMN_ID                = 0; 
    // ID列索引
    private static final int COLUMN_ALERTED_DATE      = 1;
     // 警报日期列索引

    @Override
    public void onReceive(Context context, Intent intent) {
        long currentDate = System.currentTimeMillis(); // 获取当前时间戳
        // 查询提醒日期大于当前时间的笔记
        Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
                PROJECTION,
                NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
                new String[] { String.valueOf(currentDate) },
                null);

        if (c != null) {
            // 如果结果集不为空
            if (c.moveToFirst()) {
                do {
                    long alertDate = c.getLong(COLUMN_ALERTED_DATE); 
                    // 获取警报日期
                    Intent sender = new Intent(context, AlarmReceiver.class); // 创建意图，用于发送警报
                    // 设置数据为对应的笔记URI
                    sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
                    // 创建PendingIntent，注册广播接收器
                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
                    // 获取AlarmManager服务
                    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
                    // 设置闹钟
                    alarmManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
                } while (c.moveToNext()); 
                // 遍历结果集
            }
            c.close(); 
            // 关闭Cursor
        }
    }
}