android 警报管理器在 phone 重新启动后不起作用

Question

我正在使用以下代码在特定时间使用通知提醒用户有关应用程序中的新更新一切正常，我们会在所需时间收到提醒

这是 mainactivity.java

public void setAlarm(){
    alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    alarmIntent = new Intent(MainActivity.this, AlarmReceiver.class);
    pendingIntent = PendingIntent.getBroadcast(  MainActivity.this, 0, alarmIntent, 0);

    alarmStartTime.set(Calendar.HOUR_OF_DAY, 10);
    alarmStartTime.set(Calendar.MINUTE, 00);
    alarmStartTime.set(Calendar.SECOND, 0);
    alarmManager.setRepeating(AlarmManager.RTC, alarmStartTime.getTimeInMillis(), getInterval(), pendingIntent);
}
private int getInterval(){
     int days = 1;
     int hours = 24;
     int minutes = 60;
     int seconds = 60;
     int milliseconds = 1000;
     int repeatMS = days * hours * minutes * seconds * milliseconds;
     return repeatMS;
}

AlarmReceiver.java

public class AlarmReceiver extends BroadcastReceiver {

    NotificationManager notificationManager;

    @Override
    public void onReceive(Context context, Intent intent) {
        Intent service1 = new Intent(context, AlarmService.class);
            context.startService(service1);
    }
}

和AlarmService.java

public class AlarmService extends Service { 
   private static final int NOTIFICATION_ID = 1;
   private NotificationManager notificationManager;
   private PendingIntent pendingIntent;

    @Override
    public IBinder onBind(Intent arg0)
    {
        return null;
    }

   @SuppressWarnings("static-access")
   @Override
   public void onStart(Intent intent, int startId)
   {
       super.onStart(intent, startId);
       Context context = this.getApplicationContext();
       notificationManager = (NotificationManager)context.getSystemService(context.NOTIFICATION_SERVICE);
       Intent mIntent = new Intent(this, MainActivity.class);
    pendingIntent = PendingIntent.getActivity(context, 0, mIntent, PendingIntent.FLAG_CANCEL_CURRENT);     
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
    builder.setContentTitle("Bananas");
    builder.setContentText("get your bananas");
    builder.setSmallIcon(R.drawable.ic_launcher);
    builder.setContentIntent(pendingIntent);

    notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
    notificationManager.notify(NOTIFICATION_ID, builder.build());
    }
}

我的问题是，如果我们重启 phone 所有以前关于警报的信息都丢失了，我们下次重启后没有收到警报，可以做什么是警报管理器还是通知的问题。

Answer 1

您可以使用 setExact() API 而不是使用 setRepeating，因为 setRepeating() API 会延迟 AlarmManager 意图的持续时间在 sleep mode 或 switched off 中。

Answer 2

您需要将此添加到您的 AndroidManifest.xml:

 <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

 <receiver
            android:name="Your package name.AlarmReboot"
            android:enabled="true"
            android:exported="true" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <action android:name="android.intent.action.QUICKBOOT_POWERON" />
            </intent-filter>
        </receiver>

并添加一个广播接收器，一旦 phone 重新启动，它将再次设置警报：

public class AlarmReboot extends BroadcastReceiver{

}

Answer 3

这解释得更好

http://javatechig.com/android/repeat-alarm-example-in-android

如何设置设备重启闹钟

android 警报管理器在 phone 重新启动后不起作用

android alarm manager does not work after phone is restarted

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alarmmanager