Android 通知恢复活动

Question

我正在尝试在用户暂停我的应用时发出通知。为了使其更方便，用户可以使用通知快速返回应用程序。这是我正在使用的代码。它适用于 Android 4 之前的所有版本，但我不知道问题出在哪里。

 NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.ic_launcher)    
                .setContentTitle("Titulo")
                .setContentText("Titulo");

        mBuilder.setOngoing(true);

        // Creates an explicit intent for an Activity this 
        Intent resultIntent = new Intent(getApplicationContext(), MainActivity.class);
        // put the flags
        resultIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);

        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
        // Adds the back stack for the Intent (but not the Intent itself)
        stackBuilder.addParentStack(MainActivity.class);
        // Adds the Intent that starts the Activity to the top of the stack
        stackBuilder.addNextIntent(resultIntent);
        PendingIntent resultPendingIntent =
                stackBuilder.getPendingIntent(
                    0,
                    PendingIntent.FLAG_UPDATE_CURRENT
                );
        mBuilder.setContentIntent(resultPendingIntent);
        NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        // mId allows you to update the notification later on.
        mNotificationManager.notify(mId, mBuilder.build());

当我在Android 4.0及以上版本中按下通知时，活动会被重新创建而不是恢复。请帮忙解决问题，我无法使其正常工作。

编辑（忘掉清单singletop）

使用android:launchMode="singleTop"也没有改变结果，仍然不起作用...

我的活动包含一个地图。我正在使用谷歌地图的新版本，即v2。

- Patrick

---

我遇到了同样的问题，你是如何解决的？ - iamkristher

看到编辑2，我用那个方法解决了...原因是我的待定意图有误。 - Patrick

Answer 1

我刚刚尝试了 PendingIntent.FLAG_CANCEL_CURRENT，对我来说似乎可以使用

public void showNotification(String header,String message){

            // define sound URI, the sound to be played when there's a notification
            Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

            Intent intent = new Intent(this, MainActivity.class);

            //PendingIntent.FLAG_CANCEL_CURRENT will bring the app back up again
            PendingIntent pIntent = PendingIntent.getActivity(MainActivity.this,PendingIntent.FLAG_CANCEL_CURRENT, intent, 0);

            Notification mNotification = new Notification.Builder(this)
                .setContentTitle(header)
                .setContentText(message)
                .setSmallIcon(R.drawable.ic_launcher)
                .setContentIntent(pIntent)
                .setSound(soundUri)

                .addAction(R.drawable.ic_launcher, "View", pIntent)
                .addAction(0, "Remind", pIntent)
                .setOngoing(true)//optional
                .build();

            NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

            notificationManager.notify(0, mNotification);
}

- MichaelC

---

我爱你 User3917517 - aquaflamingo

Answer 2

我在做了很多搜索后，唯一真正起作用的解决方案是执行以下操作：

NotificationCompat.Builder builder = new NotificationCompat.Builder(this).set...(...).set...(..);

Intent resultIntent = new Intent(this, MainClass.class);
resultIntent.setAction("android.intent.action.MAIN");
resultIntent.addCategory("android.intent.category.LAUNCHER");

PendingIntent resultPendingIntent = PendingIntent.getActivity(this, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);

builder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(0, builder.build());

这将打开您当前的活动而不创建另一个！

- kareem adel

---

终于！唯一解决方案为我而工作了！谢谢。 - Berrigan

Answer 3

在MainActivity的清单声明中使用android:launchMode="singleTop"。

- Arun C

---

还在用同样的方法...抱歉我忘记在问题上加注释了。 - Patrick

终于找到问题所在了...是 PendingIntent 的问题。 - Patrick

Answer 4

解决方案由@Patrick提供，取自问题并作为答案添加：

NotificationCompat.Builder mBuilder = 
                new NotificationCompat.Builder(this) 
                .setSmallIcon(R.drawable.logo)    
                .setContentTitle(getString(R.string.txt)) 
                .setContentText(getString(R.string.txt)); 

        mBuilder.setOngoing(true); 

        // Creates an explicit intent for an Activity in your app 
        Intent resultIntent = new Intent(this, Activity.class); 

        resultIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP); 

        // The stack builder object will contain an artificial back stack for the 
        // started Activity. 
        // This ensures that navigating backward from the Activity leads out of 
        // your application to the Home screen. 
        TaskStackBuilder stackBuilder = TaskStackBuilder.from(this); 
        // Adds the back stack for the Intent (but not the Intent itself) 
        stackBuilder.addParentStack(Activity.class); 
        // Adds the Intent that starts the Activity to the top of the stack 
        stackBuilder.addNextIntent(resultIntent); 
        PendingIntent resultPendingIntent = PendingIntent.getActivity(this, 0, resultIntent, 0); 
        mBuilder.setContentIntent(resultPendingIntent); 
        NotificationManager mNotificationManager = 
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 
        // mId allows you to update the notification later on. 
        mNotificationManager.notify(mId, mBuilder.getNotification());

- bummi