startActivity(Intent)每次都在破坏活动,为什么?

正如标题所述,通常只有在手机需要释放内存时才会调用onDestroy()。

My flow:Activity(A)设置循环报警,以在A的onCreate方法中向用户发送通知:

public void startEMAAlarm(){
    Log.d(TAG, "startEMAAlarm: in start ema alarm");

    Calendar cal = Calendar.getInstance();
    long when = cal.getTimeInMillis();

    cal.setTimeInMillis(System.currentTimeMillis());
    cal.set(Calendar.HOUR_OF_DAY, 8);
    cal.set(Calendar.MINUTE, 30);

    AlarmManager alarmMgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    Intent intent = new Intent(this, EMAAlarmReceiver.class);
    startEMAIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
    alarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 1000 * 60 * 20, startEMAIntent);
    Log.d(TAG, "startEMAAlarm: alarm shjould be set");
    alarmStarted = true;


}

报警接收器获取此信息,发送通知,如果选择通知,则启动活动B:

EMAAlarmReceiver: OnReceive接收{

Intent resultIntent = new Intent(context, EMA.class);
        //resultIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, resultIntent, 0);

        NotificationCompat.Action action = new NotificationCompat.Action.Builder(R.drawable.cdmh_small, "SNOOZE", snoozePendingIntent).build();

        Notification mBuilder =
                new NotificationCompat.Builder(context, CHANNEL_DI)
                        .setSmallIcon(R.drawable.noti_icon)
                        .setContentTitle("EMA")
                        .setAutoCancel(true)
                        .setContentText("Time for another EMA :)")
                        .setOngoing(true)
                        .setChannelId(CHANNEL_DI)
                        .setSound(uri)
                        .setContentIntent(pendingIntent)
                        .addAction(action)
                        .build();

        mNotificationManager.notify("first",1, mBuilder);
        Log.d(TAG, "onReceive OREO: should be notification built now");

然后通知会出现在电话上,但我一单击它,活动A就会调用其onDestroy()方法,我不知道为什么。

这并不重要,因为我可以稍后使用savedInstance等重新创建它(即活动B在离开时通过另一个意图返回到活动A), 但我不知道为什么它会在那一刻被摧毁。正如你所看到的,我目前没有使用任何标志,但我已经尝试了很多,而且似乎没有改变行为。

不确定这是否重要,但活动B只是用户滑过的Seekbar的集合,然后将其值保存到文本文件中,并返回到活动a

活动A在清单中的外观:

<activity
        android:name="com.anysoftkeyboard.ui.settings.setup.FinishInstallScreen"
        android:screenOrientation="portrait">

活动B的外观:

<activity android:name="com.radicalninja.logger.EMA"
              android:screenOrientation="portrait"/>