当通知的目标活动处于打开状态时，单击该通知不会打开新活动

Question

我有两个活动Main activity和ReceivedMessageActivity。以及一个后台服务，用于从中获取上下文并传递给SMSReceiver，SMSReceiver扩展BroadcastReceiver以接收sms。当收到短信时，SMSReceiver会创建通知。我希望当我点击通知时，如果应用程序未运行ReceivedMessageActivity，则打开该通知；如果应用程序正在运行且ReceivedMessageActivity已打开，则不要故意创建新活动，而只是将ReceivedMessageActivity放在前面。我将清单中的启动模式设置为singleTop，因为MainActivity正在工作，但ReceivedMessageActivity不工作！我将通知意图标记设置为标记|活动|带|到|前面|意图。标记活动单顶部和标记活动清除顶部但不工作。我将ReceivedMessageActivity的manifest launchMode设置为singleInstance其工作，但当我手动设置ReceivedMessageActivity时，它的默认动画不工作（从右到左动画）。这是我的通知代码：

public void addNotifiction(String title, String message) {
    NotificationCompat.Builder builder = new     
    NotificationCompat.Builder(context);
    builder.setContentTitle(title);
    builder.setContentText(message);
    builder.setStyle(new 
    NotificationCompat.BigTextStyle().bigText(message));
    builder.setAutoCancel(true);
    builder.setDefaults(Notification.DEFAULT_ALL);
    builder.setSmallIcon(R.drawable.edit_icon);
    builder.setCategory(NotificationCompat.CATEGORY_MESSAGE);
    builder.setPriority(NotificationCompat.PRIORITY_MAX);

    Intent notifactionIntent = new Intent(context,     
    ReceivedMessagesActivity.class);
    notifactionIntent 
  .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);
    TaskStackBuilder taskStackBuilder=TaskStackBuilder.create(context);
    taskStackBuilder.addNextIntentWithParentStack(notifictionIntent);
    PendingIntent contentPendingIntent= taskStackBuilder.getPendingIntent (0,PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(contentPendingIntent);
    NotificationManager manager = (NotificationManager) context.getSystemService (Context.NOTIFICATION_SERVICE);

    manager.notify(NOTIFICATION_ID++, builder.build());

}

我的上下文是MyService类上下文：

Context context=MyService.context

编辑：我发现，当我在清单中为receivedMessageActivity使用android:parentActivityName=“.MainActivity”时，会发生这种情况，当我点击通知并打开receivedMessageActivity时，我的应用程序会创建新的receivedMessageActivity为什么？

Answer 1

Notification maker的基本框架来自我的一个应用程序，希望它能有所帮助：

Context context = getApplicationContext();
String title = context.getString(R.string.title);
String subtitle = context.getString(R.string.subtitle);

Notification.Builder notificationBuilder = null;
//        Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

Intent intent = new Intent(getBaseContext(), ReceivedMessageActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |Intent.FLAG_ACTIVITY_SINGLE_TOP);

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {

    notificationBuilder = new Notification.Builder(
            context,
            CHANNEL_ID)
    ) //
            .setContentTitle(title)
            .setContentText(subtitle)
            .setSmallIcon(R.drawable.icon)
            .setColor(ContextCompat.getColor(context, R.color.colorPrimary))
            .setContentIntent(
                    PendingIntent.getActivity(
                            getBaseContext(),
                            0,
                            intent,
                            0
                    )
            )
            .setAutoCancel(true);

} else {
    notificationBuilder = new Notification.Builder(context) //
            .setContentTitle(title)
            .setContentText(subtitle)
            .setSmallIcon(R.drawable.icon)
            .setColor(ContextCompat.getColor(context, R.color.colorPrimary))
            .setContentIntent(
                    PendingIntent.getActivity(
                            getBaseContext(),
                            0,
                            intent,
                            0
                    )
            )
            .setAutoCancel(true);
}
startForeground(NOTIFICATION_ID, notificationBuilder.build());// only in case you are in service

以下代码未经测试