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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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// AlarmReceiver.java - 闹钟触发广播接收器
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// 主要功能：接收系统闹钟触发广播，启动闹钟提醒Activity
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package net.micode.notes.ui;
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// ======================= 导入区域 =======================
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// Android广播相关
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import android.content.BroadcastReceiver; // 广播接收器基类
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import android.content.Context; // 上下文
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import android.content.Intent; // 意图，用于启动Activity
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// ======================= 闹钟触发广播接收器 =======================
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/**
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* AlarmReceiver - 闹钟触发广播接收器
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* 继承自BroadcastReceiver，接收系统闹钟触发的广播
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* 主要功能：将系统闹钟广播转换为启动AlarmAlertActivity
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*
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* AndroidManifest.xml中注册：
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* <receiver
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* android:name="net.micode.notes.ui.AlarmReceiver"
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* android:process=":remote" />
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*
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* 独立进程运行，确保即使主进程被杀死也能接收闹钟
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*/
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public class AlarmReceiver extends BroadcastReceiver {
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/**
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* onReceive - 广播接收回调方法
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* 当系统闹钟触发时被调用
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* 执行流程：
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* 1. 修改Intent的目标类为AlarmAlertActivity
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* 2. 添加NEW_TASK标志
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* 3. 启动闹钟提醒Activity
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*
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* 工作流程：
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* 系统闹钟触发 → AlarmReceiver接收 → 启动AlarmAlertActivity → 显示提醒
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*
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* @param context 广播接收器的上下文
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* @param intent 接收到的广播意图，包含以下信息：
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* - Data URI: content://micode_notes/note/{noteId} (来自AlarmInitReceiver的设置)
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* - 可能包含其他闹钟相关数据
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*/
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@Override
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public void onReceive(Context context, Intent intent) {
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// 1. 修改Intent的目标Activity类
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// 原始Intent来自AlarmInitReceiver设置的PendingIntent
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// 这里将目标类改为AlarmAlertActivity
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intent.setClass(context, AlarmAlertActivity.class);
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// 2. 添加NEW_TASK标志
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// 原因：从广播接收器启动Activity必须在独立任务栈中
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// FLAG_ACTIVITY_NEW_TASK作用：
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// - 创建新的任务栈
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// - 允许从非Activity上下文（BroadcastReceiver）启动Activity
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// - 避免与现有Activity的任务栈冲突
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intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
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// 3. 启动闹钟提醒Activity
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// 启动后，AlarmAlertActivity将显示全屏提醒对话框
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context.startActivity(intent);
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}
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} |
