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### AlarmInitReceiver.java
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```java
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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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};
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//对数据库的操作，调用标签ID和闹钟时间
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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();
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//System.currentTimeMillis()产生一个当前的时间,以毫秒为单位
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//这个毫秒其实就是自1970年1月1日0时起的毫秒数
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Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
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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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//将long变量currentDate转化为字符串
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null);
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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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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);
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Intent sender = new Intent(context, AlarmReceiver.class);
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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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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());
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}
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c.close();
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}
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//闹钟机制的启动，通常需要几个步骤
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//新建Intent、PendingIntent以及AlarmManager等
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//这里就是根据数据库里的闹钟时间创建一个闹钟机制
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}
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}
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```
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