blocks|key|2527288|text|我认为Intent标志的组合应该可以解决这个问题。特别是Intent.FLAG_ACTIVITY_CLEAR_TOP和Intent.FLAG_ACTIVITY_NEW_TASK。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2527289|在调用startActvity之前将这些标志添加到您的意图中。|2527290|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_CLEAR_TOP^0|3|6|S|U|1N|T|S|U|0|0|3|C|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

I think a combination of <code>Intent</code> flags should do the trick. In particular, <a href="http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_CLEAR_TOP" rel="nofollow noreferrer"><code>Intent.FLAG_ACTIVITY_CLEAR_TOP</code></a> and <code>Intent.FLAG_ACTIVITY_NEW_TASK</code>.

Add these flags to your intent before calling <code>startActvity</code>.

blocks|key|77434|text|总的来说，我认为这种活动管理方法是不被推荐的。在堆栈中重新激活下两步的活动的问题是，此活动可能已被终止。我的建议是记住活动的状态并使用startActivity+()启动它们|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|77435|我相信你已经看过这个页面了，除了your+convenience+this+link|77436|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/app/Activity.html^0|1V|G|0|G|Q|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@$9|T|A|U|1|V]]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

In general I think this method of activity management is not recommended. The problem with reactivating an activity two Steps down in The Stack is that this activity has likely been killed. My advice into remember the state of your activities and launch them with <code>startActivity ()</code> 

I'm sure you've Seen this page but for <a href="http://developer.android.com/reference/android/app/Activity.html" rel="nofollow noreferrer">your convenience this link</a>

blocks|key|2527367|text|您可以尝试此FLAG_ACTIVITY_REORDER_TO_FRONT+(本文档准确地描述了您想要的内容)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2527368|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_REORDER_TO_FRONT^0|6|U|6|U|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

You can try this <a href="http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_REORDER_TO_FRONT" rel="noreferrer"><code>FLAG_ACTIVITY_REORDER_TO_FRONT</code></a> (the document describes exactly what you want to)

blocks|key|1116998|text|我发现最好的方法是使用与Android主屏幕相同的目的-应用程序启动器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1116999|例如：|1117000|Intent+i+=+new+Intent(this,+MyMainActivity.class);
i.setAction(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(i);|code-block|syntax|javascript|1117001|这样，我的包中用户最近使用的任何活动都会再次返回到前台。在使用我的服务的PendingIntent让用户返回到我的应用程序时，我发现这很有用。|1117002|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The best way I found to do this was to use the same intent as the Android home screen uses - the app Launcher.

For example:

<pre><code>Intent i = new Intent(this, MyMainActivity.class);
i.setAction(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(i);
</code></pre>

This way, whatever activity in my package was most recently used by the user is brought back to the front again. I found this useful in using my service's PendingIntent to get the user back to my app.

blocks|key|1117055|text|下面是你如何做到这一点的代码示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1117056|Intent+intent+=+getIntent(getApplicationContext(),+A.class)|code-block|syntax|javascript|1117057|这将确保堆栈上只有一个activity的实例。|1117058|private+static+Intent+getIntent(Context+context,+Class<?>+cls)+{
++++Intent+intent+=+new+Intent(context,+cls);
++++intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
++++return+intent;
}|1117059|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is a code-example of how you can do it:

<pre><code>Intent intent = getIntent(getApplicationContext(), A.class)
</code></pre>

This will make sure that you only have one instance of an activity on the stack. 

<pre><code>private static Intent getIntent(Context context, Class&lt;?&gt; cls) {
 Intent intent = new Intent(context, cls);
 intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
 return intent;
}
</code></pre>

blocks|key|825567|text|FLAG_ACTIVITY_REORDER_TO_FRONT：如果在传递给Context.startActivity()的意图中设置了该标志，该标志将导致已启动的活动位于其任务历史堆栈的前面(如果它已经在运行)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|825568|Intent+i+=+new+Intent(context,+AActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(i);|code-block|syntax|javascript|825569|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_REORDER_TO_FRONT^0|0|U|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<a href="http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_REORDER_TO_FRONT" rel="noreferrer">FLAG_ACTIVITY_REORDER_TO_FRONT</a>:
If set in an Intent passed to Context.startActivity(), this flag will cause the launched activity to be brought to the front of its task's history stack if it is already running.

<pre><code>Intent i = new Intent(context, AActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(i);
</code></pre>

blocks|key|2527527|text|如果您使用"Google+Cloud+Message“接收带有"PendingIntent”类的推送通知，则以下代码仅在操作栏中显示通知。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2527528|单击通知不会创建任何活动，最后一个活动活动将恢复，并保留当前状态而不会出现问题。|2527529|Intent+notificationIntent+=+new+Intent(this,+ActBase.class);+**notificationIntent.setAction(Intent.ACTION_MAIN);+notificationIntent.addCategory(Intent.CATEGORY_LAUNCHER);**+PendingIntent+contentIntent+=+PendingIntent.getActivity(this,+0,+notificationIntent,+0);|offset|length|style|CODE|2527530|NotificationCompat.Builder+mBuilder+=+new+NotificationCompat.Builder(this)+.setSmallIcon(R.drawable.ic_launcher)+.setContentTitle("Localtaxi")+.setVibrate(vibrate)+.setStyle(new+NotificationCompat.BigTextStyle().bigText(msg))+.setAutoCancel(true)+.setOnlyAlertOnce(true)+.setContentText(msg);|2527531|mBuilder.setContentIntent(contentIntent);|2527532|NotificationManager+mNotificationManager+=+(NotificationManager)+this.getSystemService(Context.NOTIFICATION_SERVICE);|2527533|mNotificationManager.notify(NOTIFICATION_ID,+mBuilder.build());|2527534|再见！|2527535|entityMap^0|0|0|0|79|0|0|84|0|0|15|0|0|39|0|0|1R|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@$F|Y|G|Z|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@$F|11|G|12|H|I]]|9|@]|A|$]]|$1|L|3|M|5|6|7|13|8|@$F|14|G|15|H|I]]|9|@]|A|$]]|$1|N|3|O|5|6|7|16|8|@$F|17|G|18|H|I]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|19|8|@$F|1A|G|1B|H|I]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1C|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|U|$]]

if you are using the "Google Cloud Message" to receive push notifications with "PendingIntent" class, the following code displays the notification in the action bar only.

Clicking the notification no activity will be created, the last active activity is restored retaining current state without problems.

<code>Intent notificationIntent = new Intent(this, ActBase.class);
**notificationIntent.setAction(Intent.ACTION_MAIN);
notificationIntent.addCategory(Intent.CATEGORY_LAUNCHER);**
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);</code>

<code>NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("Localtaxi")
.setVibrate(vibrate)
.setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
.setAutoCancel(true)
.setOnlyAlertOnce(true)
.setContentText(msg);</code>

<code>mBuilder.setContentIntent(contentIntent);</code>

<code>NotificationManager mNotificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);</code>

<code>mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());</code>

Ciao!

blocks|key|1117180|text|i.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1117181|注意:您的homeactivity启动模式应为single_task|1117182|entityMap^0|0|1E|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

<code>i.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);</code>

Note Your homeactivity launchmode should be single_task

blocks|key|824246|text|如果您想在单击通知时将活动放在堆栈的顶部，则可能需要执行以下操作才能使FLAG_ACTIVITY_REORDER_TO_FRONT工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|824247|我的解决方案是制作一个广播接收器，侦听通知触发的广播操作。所以基本上：|824248|launch.|824249|Broadcast+|unordered-list-item|824250|
|824251|通知触发带有额外活动名称的广播操作。单击通知时，launch.|824252|824253|Broadcast+receiver会捕获此消息，然后使用|824254|
标志创建启动该活动的意图。|824255|+activity被置于活动堆栈的顶部，没有重复项。|824256|824257|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|10|8|@]|9|@]|A|$]]|$1|K|3|L|5|H|7|11|8|@]|9|@]|A|$]]|$1|M|3|J|5|6|7|12|8|@]|9|@]|A|$]]|$1|N|3|O|5|H|7|13|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|14|8|@]|9|@]|A|$]]|$1|R|3|S|5|H|7|15|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

If you want to bring an activity to the top of the stack when clicking on a Notification then you may need to do the following to make the FLAG_ACTIVITY_REORDER_TO_FRONT work:

The solution for me for this was to make a broadcast receiver that listens to broadcast actions that the notification triggers. So basically:

<ol>
<li>Notification triggers a broadcast action with an extra the name of the activity to launch.</li>
<li>Broadcast receiver catches this when the notification is clicked, then creates an intent to launch that activity using the FLAG_ACTIVITY_REORDER_TO_FRONT flag</li>
<li>Activity is brought to the top of activity stack, no duplicates.</li>
</ol>

In Android, I defined an activity ExampleActivity.

When my application was launched, an instance of this A-Activity was created, say it is <code>A</code>. 
When user clicked a button in <code>A</code>, another instance of B-Activity, B was created. Now the task stack is B-A, with B at the top. Then, user clicked a button on B, another instance of C-Activity, and C was created. Now the task stack is C-B-A, with C at the top.

Now, when user click a button on C, I want the application to bring A to the foreground, i.e. make A to be at the top of task stack, A-C-B.

How can I write the code to make it happen?

How to bring an activity to foreground (top of stack)?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Android中，我定义了一个活动ExampleActivity。当我的应用程序启动时，创建了这个A-Activity的一个实例，假设它是A。当用户单击A中的按钮时，将创建B-Activity的另一个实例B。现在任务堆栈是B-A，B在顶部。然后，用户单击B上的一个按钮，这是C-Activity的另一个实例，C就创建了...

问如何将活动带到前台(堆栈顶部)？
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问如何将活动带到前台(堆栈顶部)？EN