alarm

最新推荐文章于 2025-01-19 19:28:58 发布

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自己的alarm学习笔记

alarm的主要工作流程分为以下三步:

1.APP获取服务

2.AlarmService和AlarmManger交互

3.Alarm通过广播,或activity,service通知APP

1.应用分析:

接下来可以写一个安卓测试demo来测试:

AlarmManager alarmmanager = (AlarmManager)getSystemService(ALARM_SERVICE); //第一步,获取服务,当然也就包含了第二步(AlarmService和AlarmManger交互,那是系统的事情了)
        
        PendingIntent pi = PendingIntent.getBroadcast(this, 0, new Intent(this, ActionBroadCast.class), Intent.FLAG_ACTIVITY_NEW_TASK); //绑定广播</span>
        long now = System.currentTimeMillis();  
        setInexactRepeating(AlarmManager.RTC_WAKEUP, now, 3000, pi);//参考这里http://www.android-doc.com/reference/android/app/AlarmManager.html

 @Override  
    public void onReceive(Context context, Intent intent) { <span style="font-family: Arial, Helvetica, sans-serif;">//第三步,注册广播,等待系统通知</span>
        // TODO Auto-generated method stub  
        Log.e("ActionBroadCast", "New Message !" + num++);  
    }

intervalMillisinterval in milliseconds between subsequent repeats of the alarm. Prior to API 19, if this is one of INTERVAL_FIFTEEN_MINUTES, INTERVAL_HALF_HOUR, INTERVAL_HOUR, INTERVAL_HALF_DAY, or INTERVAL_DAY then the alarm will be phase-aligned with other alarms to reduce the number of wakeups. Otherwise, the alarm will be set as though the application had called setRepeating(int, long, long, PendingIntent). As of API 19, all repeating alarms will be inexact and subject to batching with other alarms regardless of their stated repeat interval.

<span style="color: rgb(34, 34, 34); font-family: Roboto, sans-serif;  background-color: rgb(249, 249, 249);"><em><span style="color: rgb(34, 34, 34); font-family: Roboto, sans-serif;  background-color: rgb(249, 249, 249);"><em><span style="font-size:14px;">operation                <span style="color: rgb(34, 34, 34); font-family: Roboto, sans-serif; background-color: rgb(249, 249, 249);">Action to perform when the alarm goes off; typically comes from </span><code style="color: rgb(0, 102, 0); font-stretch: normal; line-height: 14px; margin-bottom: 0px; background-color: rgb(249, 249, 249);"><a target=_blank href="http://www.android-doc.com/reference/android/app/PendingIntent.html#getBroadcast(android.content.Context, int, android.content.Intent, int)" style="color: rgb(37, 138, 175); text-decoration: none; margin-bottom: 0px;">IntentSender.getBroadcast()</a></code><span style="color: rgb(34, 34, 34); font-family: Roboto, sans-serif; background-color: rgb(249, 249, 249);">.</span></span></em></span></em></span>

2.框架分析:

Alarm在安卓系统中主要分为如下几层:

框架中的主要调用流程如下: