Question

我正在做一个报警系统，但是当手机关机时我遇到了问题..闹钟不起作用..

我按照以下方式设置了警报：

    public void doIntents(Context context, long milis, Tratam trat){
    cal=Calendar.getInstance();
    alarmManager = (AlarmManager) context.getSystemService(Service.ALARM_SERVICE);

    cal.setTimeInMillis(milis);
    Intent intent = new Intent(context, OnAlarmReceiver.class);


    pendingIntent = PendingIntent.getBroadcast(context, trat.getId(), intent, PendingIntent.FLAG_UPDATE_CURRENT);
    alarmManager.set(AlarmManager.RTC_WAKEUP,milis ,pendingIntent);

}

当手机开机时闹钟正常工作..

我该怎么办？

谢谢！

Answer 1

是的，问题是当手机重启时你的应用程序没有运行。您需要注册一个可以接收BOOT_COMPLETED消息的BroadcastReceiver，以便在手机重新启动时收到消息。然后在BroadcastReceiver中，您可以重新安排这些警报或其他任何内容。但我不认为在手机关闭时你可以做任何关于触发警报的事情......（例如打开手机）

<receiver android:name="MyBootReceiver"
        android:enabled="true"
        android:exported="true"
        android:label="BootReceiver">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED"></action>

        </intent-filter>
    </receiver>

Answer 2

当手机关闭并重新启动时，警报会被清除，但您可以使用可以接收BOOT_COMPLETED的BroadcastReceiver启动警报

In Manifest.xml:

 <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
  <application ...>
 <receiver android:name="com.example.receiver.AlarmMonitorReceiver"
              android:enabled="true"
              android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED"/>
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>
</application>

爪哇：

public class AlarmMonitorReceiver extends BroadcastReceiver{
  public void onReceive(Context context,Intent intent) { 
    if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
      AlarmManager alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE); 
      Intent intentAlarm = new Intent(context, ExampleReceiver.class); 
      PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intentAlarm, 0);
      Calendar time = Calendar.getInstance();
      time.setTimeInMillis(System.currentTimeMillis());
      time.add(Calendar.SECOND, 10);
      alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, time.getTimeInMillis(),10000,pendingIntent);         
    }  

  }

}

手机关闭时的AlarmManager - ANDROID

2 个答案: