From 3d5939c01d81af2c369553665a50af442ec4b84f Mon Sep 17 00:00:00 2001 From: pz96pqh8i <3326392379@qq.com> Date: Tue, 31 Dec 2024 02:05:14 +0800 Subject: [PATCH] ADD file via upload --- AlarmInitReceiver.java | 152 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 152 insertions(+) create mode 100644 AlarmInitReceiver.java diff --git a/AlarmInitReceiver.java b/AlarmInitReceiver.java new file mode 100644 index 0000000..c26f03e --- /dev/null +++ b/AlarmInitReceiver.java @@ -0,0 +1,152 @@ +/* + * 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; + +import android.app.AlarmManager; +import android.app.PendingIntent; +import android.content.BroadcastReceiver; +import android.content.ContentUris; +import android.content.Context; +import android.content.Intent; +import android.database.Cursor; + +import net.micode.notes.data.Notes; +import net.micode.notes.data.Notes.NoteColumns; + + +public class AlarmInitReceiver extends BroadcastReceiver { + + private static final String [] PROJECTION = new String [] { + NoteColumns.ID, + NoteColumns.ALERTED_DATE + }; + + private static final int COLUMN_ID = 0; + private static final int COLUMN_ALERTED_DATE = 1; + + @Override + public void onReceive(Context context, Intent intent) { + long currentDate = System.currentTimeMillis(); + 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) { + if (c.moveToFirst()) { + do { + long alertDate = c.getLong(COLUMN_ALERTED_DATE); + Intent sender = new Intent(context, AlarmReceiver.class); + sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID))); + PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0); + AlarmManager alermManager = (AlarmManager) context + .getSystemService(Context.ALARM_SERVICE); + alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent); + } while (c.moveToNext()); + } + c.close(); + } + } +} +package net.micode.notes.ui; + +import android.app.AlarmManager; +import android.app.PendingIntent; +import android.content.BroadcastReceiver; +import android.content.ContentUris; +import android.content.Context; +import android.content.Intent; +import android.database.Cursor; + +import net.micode.notes.data.Notes; +import net.micode.notes.data.Notes.NoteColumns; + +// AlarmInitReceiver类继承自BroadcastReceiver,用于接收系统广播并处理与闹钟初始化相关的操作 +// 其主要功能是从数据库中查询满足条件的便签记录,并为这些便签设置对应的闹钟提醒 +public class AlarmInitReceiver extends BroadcastReceiver { + + // 定义一个字符串数组,用于指定从数据库中查询时需要获取的列名 + // 这里获取的是便签的唯一标识符(ID)和提醒日期(ALERTED_DATE)两列 + private static final String [] PROJECTION = new String [] { + NoteColumns.ID, + NoteColumns.ALERTED_DATE + }; + + // 定义常量,表示查询结果中ID列对应的索引位置,方便后续从Cursor中获取数据 + private static final int COLUMN_ID = 0; + // 定义常量,表示查询结果中ALERTED_DATE列对应的索引位置,方便后续从Cursor中获取数据 + private static final int COLUMN_ALERTED_DATE = 1; + + // onReceive方法是BroadcastReceiver的核心方法,当接收到相应广播时会被调用 + @Override + public void onReceive(Context context, Intent intent) { + // 获取当前系统的时间戳(以毫秒为单位),用于后续在数据库查询中作为比较条件,筛选出需要设置闹钟提醒的便签 + long currentDate = System.currentTimeMillis(); + + // 通过ContentResolver查询数据库,获取满足条件的便签记录信息 + // 参数说明: + // 1. Notes.CONTENT_NOTE_URI:指定查询的内容提供器的Uri,指向便签相关的数据表 + // 2. PROJECTION:前面定义的要查询的列名数组,即获取便签的ID和提醒日期两列数据 + // 3. NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE:查询条件,筛选出提醒日期大于当前日期且类型为普通便签(假设Notes.TYPE_NOTE代表普通便签类型)的记录 + // 4. new String[] { String.valueOf(currentDate) }:为查询条件中的占位符(?)提供实际的值,即当前日期 + // 5. null:表示按照默认的排序方式进行排序,如果有需要也可以指定具体的排序规则 + 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); + + // 判断查询结果的Cursor是否为空,如果不为空,说明有满足条件的便签记录 + if (c!= null) { + // 将游标移动到查询结果的第一条记录位置,如果有记录则返回true,否则返回false + if (c.moveToFirst()) { + // 使用do-while循环遍历查询结果集,处理每条满足条件的便签记录 + do { + // 从Cursor中获取提醒日期这一列的值(以长整型表示),对应之前定义的COLUMN_ALERTED_DATE索引位置 + long alertDate = c.getLong(COLUMN_ALERTED_DATE); + + // 创建一个Intent对象,用于启动AlarmReceiver(可能是处理闹钟提醒触发逻辑的广播接收器) + Intent sender = new Intent(context, AlarmReceiver.class); + // 为Intent设置数据部分,通过ContentUris工具类将便签的唯一标识符(ID)附加到便签内容提供器的Uri上 + // 这样接收方可以根据这个Uri获取到具体是哪个便签的闹钟提醒触发了 + sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID))); + + // 创建一个PendingIntent对象,用于包装前面创建的Intent,使得它可以在稍后被触发(例如作为闹钟触发时启动的目标意图) + // 参数说明: + // 1. context:当前的应用上下文环境 + // 2. 0:请求码,这里暂时设置为0,一般如果有多个不同用途的PendingIntent可以设置不同的请求码来区分 + // 3. sender:要包装的Intent对象,即前面创建的启动AlarmReceiver的Intent + // 4. 0:标志位,这里暂时设置为0,根据不同需求可以设置不同的标志来控制PendingIntent的行为 + PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0); + + // 获取系统的AlarmManager服务,AlarmManager用于管理和设置闹钟相关的操作 + AlarmManager alermManager = (AlarmManager) context + .getSystemService(Context.ALARM_SERVICE); + + // 使用AlarmManager设置闹钟提醒,具体参数含义如下: + // 1. AlarmManager.RTC_WAKEUP:闹钟类型,表示在指定的时间(alertDate)唤醒设备并触发闹钟(如果设备处于睡眠状态) + // 2. alertDate:设置闹钟触发的时间,即从数据库中获取的该便签的提醒日期对应的时间戳(以毫秒为单位) + // 3. pendingIntent:前面创建的PendingIntent对象,当闹钟触发时会启动对应的Intent(这里是启动AlarmReceiver) + alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent); + } while (c.moveToNext()); + } + // 关闭游标,释放相关的系统资源,避免内存泄漏等问题,查询操作完成后需要及时关闭游标 + c.close(); + } + } +} \ No newline at end of file