blocks|key|289876|text|您是否尝试过singleTop启动模式？|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|289877|以下是来自http://developer.android.com/guide/topics/manifest/activity-element.html的一些描述|289878|289879|+...还可以创建"singleTop“活动的新实例来处理新的意图。但是，如果目标任务在其堆栈的顶部已经有一个活动的现有实例，则该实例将接收新的意图(在onNewIntent()调用中)；不会创建新的实例。在其他情况下-例如，如果"singleTop“活动的现有实例在目标任务中，但不在堆栈的顶部，或者如果它在堆栈的顶部，但不在目标任务中-将创建一个新实例并将其推送到堆栈上。|blockquote|289880|289881|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/guide/topics/manifest/activity-element.html^0|6|9|0|5|20|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|H|3|-4|5|6|7|11|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|12|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|13|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Have you tried the singleTop launch mode?

Here is some of the description from <a href="http://developer.android.com/guide/topics/manifest/activity-element.html" rel="noreferrer">http://developer.android.com/guide/topics/manifest/activity-element.html</a>:

<blockquote>
 ... a new instance of a "singleTop"
 activity may also be created to handle
 a new intent. However, if the target
 task already has an existing instance
 of the activity at the top of its
 stack, that instance will receive the
 new intent (in an onNewIntent() call);
 a new instance is not created. In
 other circumstances — for example, if
 an existing instance of the
 "singleTop" activity is in the target
 task, but not at the top of the stack,
 or if it's at the top of a stack, but
 not in the target task — a new
 instance would be created and pushed
 on the stack.
</blockquote>

blocks|key|289912|text|尝试在亲和性设置为allowtaskreparenting的情况下使用SingleInstance启动模式，这将始终在新任务中创建活动，但也允许为其重新设置父关系。检查dis+:Affinity+attribute|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|289913|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/guide/topics/manifest/activity-element.html#reparent^0|9|K|Z|E|2H|I|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

try using SingleInstance launch mode with affinity set to allowtaskreparenting
This will always create the activity in new task but also allow its reparenting.
Check dis :<a href="http://developer.android.com/guide/topics/manifest/activity-element.html#reparent" rel="nofollow">Affinity attribute</a>

blocks|key|3006977|text|我也遇到了同样的问题，我使用下面的解决方案解决了它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3006978|在主活动中，将以下代码添加到onCreate方法的顶部：|offset|length|style|CODE|3006979|ActivityManager+manager+=+(ActivityManager)+this.getSystemService(+ACTIVITY_SERVICE+);
List<RunningTaskInfo>+tasks+=++manager.getRunningTasks(Integer.MAX_VALUE);

for+(RunningTaskInfo+taskInfo+:+tasks)+{
++++if(taskInfo.baseActivity.getClassName().equals(<your+package+name>.<your+class+name>)+&&+(taskInfo.numActivities+>+1)){
++++++++finish();
++++}
}|code-block|syntax|javascript|3006980|不要忘记在您的清单中添加此权限。|3006981|<+uses-permission+android:name="android.permission.GET_TASKS"+/>|3006982|希望能对你有所帮助。|3006983|entityMap^0|0|E|8|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

I had the same problem, and I fixed it using the following solution.

In your main activity add this code on the top of the <code>onCreate</code> method:

<pre><code>ActivityManager manager = (ActivityManager) this.getSystemService( ACTIVITY_SERVICE );
List&lt;RunningTaskInfo&gt; tasks = manager.getRunningTasks(Integer.MAX_VALUE);

for (RunningTaskInfo taskInfo : tasks) {
 if(taskInfo.baseActivity.getClassName().equals(&lt;your package name&gt;.&lt;your class name&gt;) &amp;&amp; (taskInfo.numActivities &gt; 1)){
 finish();
 }
}
</code></pre>

don't forget to add this permission in your manifest.

<pre><code>&lt; uses-permission android:name="android.permission.GET_TASKS" /&gt;
</code></pre>

hope it helps you.

blocks|key|3220981|text|也许是this+issue？或者是同一个bug的其他形式？|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3220982|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/android/issues/detail?id=2373^0|3|A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Perhaps it is <a href="http://code.google.com/p/android/issues/detail?id=2373" rel="nofollow">this issue</a>? Or some other form of the same bug?

blocks|key|292291|text|将此代码添加到onCreate中，您就可以开始工作了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|292292|//+Possible+work+around+for+market+launches.+See+https://issuetracker.google.com/issues/36907463
//+for+more+details.+Essentially,+the+market+launches+the+main+activity+on+top+of+other+activities.
//+we+never+want+this+to+happen.+Instead,+we+check+if+we+are+the+root+and+if+not,+we+finish.
if+(!isTaskRoot())+{
++++final+Intent+intent+=+getIntent();
++++if+(intent.hasCategory(Intent.CATEGORY_LAUNCHER)+&&+Intent.ACTION_MAIN.equals(intent.getAction()))+{
++++++++Log.w(LOG_TAG,+"Main+Activity+is+not+the+root.++Finishing+Main+Activity+instead+of+launching.");
++++++++finish();
++++++++return;+++++++
++++}
}|code-block|syntax|javascript|292293|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Add this to onCreate and you should be good to go:

<pre><code>// Possible work around for market launches. See https://issuetracker.google.com/issues/36907463
// for more details. Essentially, the market launches the main activity on top of other activities.
// we never want this to happen. Instead, we check if we are the root and if not, we finish.
if (!isTaskRoot()) {
 final Intent intent = getIntent();
 if (intent.hasCategory(Intent.CATEGORY_LAUNCHER) &amp;&amp; Intent.ACTION_MAIN.equals(intent.getAction())) {
 Log.w(LOG_TAG, "Main Activity is not the root. Finishing Main Activity instead of launching.");
 finish();
 return; 
 }
}
</code></pre>

blocks|key|292297|text|我也有这个问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|292298|292299|不调用finished.|ordered-list-item|292300|Usually+()；在home活动中，它将无休止地运行-当配置发生变化(例如，旋转屏幕、更改语言、电话服务更改，如mcc+mnc等)时，home活动将被ActivityManager调用。活动重新创建-如果主页活动正在运行，则它将再次调用A。有关需要添加到清单android:configChanges="mcc%7Cmnc"的信息，请参阅http://developer.android.com/guide/topics/manifest/activity-element.html#config了解引导系统或推开系统时的配置。|offset|length|style|CODE|292301|292302|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/guide/topics/manifest/activity-element.html#config^0|0|0|0|3N|V|4P|27|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|X|8|@$H|Y|I|Z|J|K]]|9|@$H|10|I|11|1|12]]|A|$]]|$1|L|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

I had this problem also

<ol>
<li>Don't call finish(); in the home activity it would run endlessly - home activity is being called by ActivityManager when it finished.</li>
<li>Usually when the configuration is changing (i.e. rotate screen, change language, telephony service changes i.e. mcc mnc etc.) the activity recreate - and if the home activity is running then it calls again to A. for that need to add to manifest <code>android:configChanges="mcc|mnc"</code> - if you have connection to cellular, see <a href="http://developer.android.com/guide/topics/manifest/activity-element.html#config" rel="nofollow">http://developer.android.com/guide/topics/manifest/activity-element.html#config</a> for which configuration there is when booting the system or push open or whatever. </li>
</ol>

blocks|key|287226|text|我将解释它失败的原因，以及如何以编程方式重现此错误，以便您可以将其合并到您的测试套件中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287227|通过Eclipse或Market应用程序启动应用程序时，它会使用意图标志启动:通过启动器(+FLAG_ACTIVITY_NEW_TASK.|287228|When+)启动，它使用标志:+FLAG_ACTIVITY_NEW_TASK+%7C+FLAG_ACTIVITY_BROUGHT_TO_FRONT+%7C+FLAG_ACTIVITY_RESET_TASK_IF_NEEDED，并使用操作"MAIN“和类别"+launcher”。|unordered-list-item|287229|287230|如果您希望在测试用例中重现此过程，请使用以下步骤：|287231|adb+shell+am+start+-f+0x10000000+-n+com.testfairy.tests.regression.taskroot/.MainActivity+|code-block|syntax|javascript|287232|然后执行其他活动所需的任何操作。出于我的目的，我只是放置了一个按钮来启动另一个活动。然后，使用以下命令返回启动器(主页)：|287233|adb+shell+am+start+-W+-c+android.intent.category.HOME+-a+android.intent.action.MAIN|287234|并使用以下命令模拟通过launcher启动它：|287235|adb+shell+am+start+-a+"android.intent.action.MAIN"+-c+"android.intent.category.LAUNCHER"+-f+0x10600000+-n+com.testfairy.tests.regression.taskroot/.MainActivity|287236|如果您没有合并isTaskRoot()解决方法，这将重现该问题。我们在自动测试中使用它来确保这个bug永远不会再次发生。|287237|希望这能有所帮助！|287238|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|19|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|1A|8|@]|9|@]|A|$]]|$1|U|3|V|5|L|7|1B|8|@]|9|@]|A|$M|N]]|$1|W|3|X|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1D|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|11|$]]

I'm just going to explain why it fails, and how to reproduce this bug programmatically so you can incorporate this in your test suite:

<ol>
<li>When you launch an app through Eclipse or Market App, it launches with intent flags: FLAG_ACTIVITY_NEW_TASK.</li>
<li>When launching through the launcher (home), it uses flags: FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_BROUGHT_TO_FRONT | FLAG_ACTIVITY_RESET_TASK_IF_NEEDED, and uses action "MAIN" and category "LAUNCHER". </li>
</ol>

If you would like to reproduce this in a test case, use these steps:

<pre><code>adb shell am start -f 0x10000000 -n com.testfairy.tests.regression.taskroot/.MainActivity 
</code></pre>

Then do whatever is needed to get to the other activity. For my purposes, I just placed a button that starts another activity. Then, go back to the launcher (home) with:

<pre><code>adb shell am start -W -c android.intent.category.HOME -a android.intent.action.MAIN
</code></pre>

And simulate launching it via the launcher with this:

<pre><code>adb shell am start -a "android.intent.action.MAIN" -c "android.intent.category.LAUNCHER" -f 0x10600000 -n com.testfairy.tests.regression.taskroot/.MainActivity
</code></pre>

If you haven't incorporated the isTaskRoot() workaround, this will reproduce the problem. We use this in our automatic testing to make sure this bug never occurs again.

Hope this helps!

blocks|key|287246|text|尝试此解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287247|创建Application类并在其中定义：|offset|length|style|CODE|287248|public+static+boolean+IS_APP_RUNNING+=+false;|code-block|syntax|javascript|287249|287250|然后在setContentView(...)之前的onCreate中的第一个(启动器)活动中添加以下内容：|287251|if+(Controller.IS_APP_RUNNING+==+false)
{
++Controller.IS_APP_RUNNING+=+true;
++setContentView(...)
++//Your+onCreate+code...
}
else
++finish();|287252|287253|P.S.+Controller是我的Application类。|287254|entityMap^0|0|2|B|0|0|0|3|J|P|8|0|0|0|5|A|I|B|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|12|8|@$D|13|E|14|F|G]|$D|15|E|16|F|G]]|9|@]|A|$]]|$1|P|3|Q|5|J|7|17|8|@]|9|@]|A|$K|L]]|$1|R|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|19|8|@$D|1A|E|1B|F|G]|$D|1C|E|1D|F|G]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|V|$]]

Try this solution: 
Create <code>Application</code> class and define there:

<pre><code>public static boolean IS_APP_RUNNING = false;
</code></pre>

<hr>

Then in your first (Launcher) Activity in <code>onCreate</code> before <code>setContentView(...)</code> add this:

<pre><code>if (Controller.IS_APP_RUNNING == false)
{
 Controller.IS_APP_RUNNING = true;
 setContentView(...)
 //Your onCreate code...
}
else
 finish();
</code></pre>

<hr>

P.S. <code>Controller</code>is my <code>Application</code> class.

blocks|key|290044|text|我认为接受答案(Duane+Homick)有未处理的案例：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|290045|你有不同的附加组件(结果是重复的应用程序)：|290046|当您从市场或通过主屏幕图标(由+automatically)|290047|when放置)启动应用程序时，您可以通过启动程序或手动创建的主屏幕图标|unordered-list-item|290048|来启动应用程序|290049|这里有一个解决方案(用于通知的SDK_INT>=11)，我相信它也可以处理这些情况和状态栏通知。|290050|清单|style|BOLD|290051|++++<activity
++++++++android:name="com.acme.activity.LauncherActivity"
++++++++android:noHistory="true">
++++++++<intent-filter>
++++++++++++<action+android:name="android.intent.action.MAIN"+/>
++++++++++++<category+android:name="android.intent.category.LAUNCHER"+/>
++++++++++++<category+android:name="android.intent.category.DEFAULT"+/>
++++++++</intent-filter>
++++</activity>
++++<service+android:name="com.acme.service.LauncherIntentService"+/>|code-block|syntax|javascript|290052|启动器活动|290053|public+static+Integer+lastLaunchTag+=+null;
@Override
public+void+onCreate(final+Bundle+savedInstanceState)+{
++++super.onCreate(savedInstanceState);

++++mInflater+=+LayoutInflater.from(this);
++++View+mainView+=+null;
++++mainView+=+mInflater.inflate(R.layout.act_launcher,+null);+//+empty+layout
++++setContentView(mainView);

++++if+(getIntent()+==+null+%7C%7C+getIntent().getExtras()+==+null+%7C%7C+!getIntent().getExtras().containsKey(Consts.EXTRA_ACTIVITY_LAUNCH_FIX))+{
++++++++Intent+serviceIntent+=+new+Intent(this,+LauncherIntentService.class);
++++++++if+(getIntent()+!=+null+&&+getIntent().getExtras()+!=+null)+{
++++++++++++serviceIntent.putExtras(getIntent().getExtras());
++++++++}
++++++++lastLaunchTag+=+(int)+(Math.random()*100000);
++++++++serviceIntent.putExtra(Consts.EXTRA_ACTIVITY_LAUNCH_TAG,+Integer.valueOf(lastLaunchTag));
++++++++startService(serviceIntent);

++++++++finish();
++++++++return;
++++}

++++Intent+intent+=+new+Intent(this,+SigninActivity.class);
++++if+(getIntent()+!=+null+&&+getIntent().getExtras()+!=+null)+{
++++++++intent.putExtras(getIntent().getExtras());
++++}
++++startActivity(intent);
}|290054|服务|290055|@Override
protected+void+onHandleIntent(final+Intent+intent)+{
++++Bundle+extras+=+intent.getExtras();
++++Integer+lastLaunchTag+=+extras.getInt(Consts.EXTRA_ACTIVITY_LAUNCH_TAG);

++++try+{
++++++++Long+timeStart+=+new+Date().getTime();+
++++++++while+(new+Date().getTime()+-+timeStart+<+100)+{
++++++++++++Thread.currentThread().sleep(25);
++++++++++++if+(!lastLaunchTag.equals(LauncherActivity.lastLaunchTag))+{
++++++++++++++++break;
++++++++++++}
++++++++}
++++++++Thread.currentThread().sleep(25);
++++++++launch(intent);
++++}+catch+(InterruptedException+e)+{
++++++++e.printStackTrace();
++++}
}

private+void+launch(Intent+intent)+{
++++Intent+launchIintent+=+new+Intent(LauncherIntentService.this,+LauncherActivity.class);
++++launchIintent.addCategory(Intent.CATEGORY_LAUNCHER);
++++launchIintent.setAction(Intent.ACTION_MAIN);+
++++launchIintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
++++launchIintent.addFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);+
++++if+(intent+!=+null+&&+intent.getExtras()+!=+null)+{
++++++++launchIintent.putExtras(intent.getExtras());
++++}
++++launchIintent.putExtra(Consts.EXTRA_ACTIVITY_LAUNCH_FIX,+true);
++++startActivity(launchIintent);
}|290056|Notification|290057|ComponentName+actCN+=+new+ComponentName(context.getPackageName(),+LauncherActivity.class.getName());+
Intent+contentIntent+=+new+Intent(context,+LauncherActivity.class);
contentIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);++++
if+(Build.VERSION.SDK_INT+>=+11)+{+
++++contentIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);+//+if+you+need+to+recreate+activity+stack
}
contentIntent.addCategory(Intent.CATEGORY_LAUNCHER);
contentIntent.setAction(Intent.ACTION_MAIN);
contentIntent.putExtra(Consts.EXTRA_CUSTOM_DATA,+true);|290058|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/7748416/3065307^0|8|C|0|0|0|0|0|0|0|0|2|0|0|0|5|0|0|0|2|0|0|0|C|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@$A|1I|B|1J|1|1K]]|C|$]]|$1|D|3|E|5|6|7|1L|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|1M|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1N|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1O|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|1P|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|1Q|8|@$A|1R|B|1S|Q|R]]|9|@]|C|$]]|$1|S|3|T|5|U|7|1T|8|@]|9|@]|C|$V|W]]|$1|X|3|Y|5|6|7|1U|8|@$A|1V|B|1W|Q|R]]|9|@]|C|$]]|$1|Z|3|10|5|U|7|1X|8|@]|9|@]|C|$V|W]]|$1|11|3|12|5|6|7|1Y|8|@$A|1Z|B|20|Q|R]]|9|@]|C|$]]|$1|13|3|14|5|U|7|21|8|@]|9|@]|C|$V|W]]|$1|15|3|16|5|6|7|22|8|@$A|23|B|24|Q|R]]|9|@]|C|$]]|$1|17|3|18|5|U|7|25|8|@]|9|@]|C|$V|W]]|$1|19|3|-4|5|6|7|26|8|@]|9|@]|C|$]]]|1A|$1B|$5|1C|1D|1E|C|$1F|1G]]]]

I think the accepted answer (<a href="https://stackoverflow.com/a/7748416/3065307">Duane Homick</a>) has unhandled cases:

You have different extras (and app duplicates as a result):

<ul>
<li>when you launch application from Market or by home screen icon (which is placed by Market automatically)</li>
<li>when you launch application by launcher or manually created home screen icon</li>
</ul>

Here is a solution (SDK_INT>=11 for notifications) which i belive handle these cases and statusbar notifications also.

Manifest:

<pre><code> &lt;activity
 android:name="com.acme.activity.LauncherActivity"
 android:noHistory="true"&gt;
 &lt;intent-filter&gt;
 &lt;action android:name="android.intent.action.MAIN" /&gt;
 &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
 &lt;category android:name="android.intent.category.DEFAULT" /&gt;
 &lt;/intent-filter&gt;
 &lt;/activity&gt;
 &lt;service android:name="com.acme.service.LauncherIntentService" /&gt;
</code></pre>

Launcher activity:

<pre><code>public static Integer lastLaunchTag = null;
@Override
public void onCreate(final Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 mInflater = LayoutInflater.from(this);
 View mainView = null;
 mainView = mInflater.inflate(R.layout.act_launcher, null); // empty layout
 setContentView(mainView);

 if (getIntent() == null || getIntent().getExtras() == null || !getIntent().getExtras().containsKey(Consts.EXTRA_ACTIVITY_LAUNCH_FIX)) {
 Intent serviceIntent = new Intent(this, LauncherIntentService.class);
 if (getIntent() != null &amp;&amp; getIntent().getExtras() != null) {
 serviceIntent.putExtras(getIntent().getExtras());
 }
 lastLaunchTag = (int) (Math.random()*100000);
 serviceIntent.putExtra(Consts.EXTRA_ACTIVITY_LAUNCH_TAG, Integer.valueOf(lastLaunchTag));
 startService(serviceIntent);

 finish();
 return;
 }

 Intent intent = new Intent(this, SigninActivity.class);
 if (getIntent() != null &amp;&amp; getIntent().getExtras() != null) {
 intent.putExtras(getIntent().getExtras());
 }
 startActivity(intent);
}
</code></pre>

Service:

<pre><code>@Override
protected void onHandleIntent(final Intent intent) {
 Bundle extras = intent.getExtras();
 Integer lastLaunchTag = extras.getInt(Consts.EXTRA_ACTIVITY_LAUNCH_TAG);

 try {
 Long timeStart = new Date().getTime(); 
 while (new Date().getTime() - timeStart &lt; 100) {
 Thread.currentThread().sleep(25);
 if (!lastLaunchTag.equals(LauncherActivity.lastLaunchTag)) {
 break;
 }
 }
 Thread.currentThread().sleep(25);
 launch(intent);
 } catch (InterruptedException e) {
 e.printStackTrace();
 }
}

private void launch(Intent intent) {
 Intent launchIintent = new Intent(LauncherIntentService.this, LauncherActivity.class);
 launchIintent.addCategory(Intent.CATEGORY_LAUNCHER);
 launchIintent.setAction(Intent.ACTION_MAIN); 
 launchIintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 launchIintent.addFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); 
 if (intent != null &amp;&amp; intent.getExtras() != null) {
 launchIintent.putExtras(intent.getExtras());
 }
 launchIintent.putExtra(Consts.EXTRA_ACTIVITY_LAUNCH_FIX, true);
 startActivity(launchIintent);
}
</code></pre>

Notification:

<pre><code>ComponentName actCN = new ComponentName(context.getPackageName(), LauncherActivity.class.getName()); 
Intent contentIntent = new Intent(context, LauncherActivity.class);
contentIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
if (Build.VERSION.SDK_INT &gt;= 11) { 
 contentIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK); // if you need to recreate activity stack
}
contentIntent.addCategory(Intent.CATEGORY_LAUNCHER);
contentIntent.setAction(Intent.ACTION_MAIN);
contentIntent.putExtra(Consts.EXTRA_CUSTOM_DATA, true);
</code></pre>

blocks|key|290060|text|我找到了一种方法来防止开始相同的活动，这对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|290061|if+(+!this.getClass().getSimpleName().equals("YourActivityClassName"))+{
++++start+your+activity
}|code-block|syntax|javascript|290062|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I found a way to prevent starting same activities, this works great for me

<pre><code>if ( !this.getClass().getSimpleName().equals("YourActivityClassName")) {
 start your activity
}
</code></pre>

blocks|key|3007282|text|我意识到这个问题与Xamarin+Android没有任何关系，但我想发布一些东西，因为我在其他地方没有看到它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3007283|为了在Xamarin+Android中修复这个问题，我使用了@DuaneHomick中的代码，并将其添加到MainActivity.OnCreate()中。与Xamarin的不同之处在于，它必须追随Xamarin.Forms.Forms.Init(this,+bundle);和LoadApplication(new+App());。所以我的OnCreate()应该是这样的：|offset|length|style|CODE|3007284|protected+override+void+OnCreate(Bundle+bundle)+{
++++base.OnCreate(bundle);

++++Xamarin.Forms.Forms.Init(this,+bundle);
++++LoadApplication(new+App());

++++if(!IsTaskRoot)+{
++++++++Intent+intent+=+Intent;
++++++++string+action+=+intent.Action;
++++++++if(intent.HasCategory(Intent.CategoryLauncher)+&&+action+!=+null+&&+action.Equals(Intent.ActionMain,+System.StringComparison.OrdinalIgnoreCase))+{
++++++++++++System.Console.WriteLine("\nIn+APP.Droid.MainActivity.OnCreate()+-+Finishing+Activity+and+returning+since+a+second+MainActivity+has+been+created.\n");
++++++++++++Finish();
++++++++++++return;+//Not+necessary+if+there+is+no+code+below
++++++++}
++++}
}|code-block|syntax|javascript|3007285|*编辑:从Android+6.0开始，对于某些情况，上述解决方案是不够的。我现在还将LaunchMode设置为SingleTask，这似乎又一次使一切正常工作。不幸的是，我不确定这可能会对其他事情产生什么影响。|3007286|entityMap^0|0|1H|N|2R|13|3V|R|4R|A|0|0|16|A|1J|A|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]|$D|U|E|V|F|G]|$D|W|E|X|F|G]|$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|11|8|@$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|P|$]]

I realize that the question does not have anything to do with Xamarin Android but I wanted to post something since I did not see it anywhere else.

To fix this in Xamarin Android I used the code from @DuaneHomick and added into <code>MainActivity.OnCreate()</code>. The difference with Xamarin is that is must go after <code>Xamarin.Forms.Forms.Init(this, bundle);</code> and <code>LoadApplication(new App());</code>. So my <code>OnCreate()</code> would look like:

<pre><code>protected override void OnCreate(Bundle bundle) {
 base.OnCreate(bundle);

 Xamarin.Forms.Forms.Init(this, bundle);
 LoadApplication(new App());

 if(!IsTaskRoot) {
 Intent intent = Intent;
 string action = intent.Action;
 if(intent.HasCategory(Intent.CategoryLauncher) &amp;&amp; action != null &amp;&amp; action.Equals(Intent.ActionMain, System.StringComparison.OrdinalIgnoreCase)) {
 System.Console.WriteLine("\nIn APP.Droid.MainActivity.OnCreate() - Finishing Activity and returning since a second MainActivity has been created.\n");
 Finish();
 return; //Not necessary if there is no code below
 }
 }
}
</code></pre>

*Edit: Since Android 6.0, the above solution is not enough for certain situations. I have now also set <code>LaunchMode</code> to <code>SingleTask</code>, which seems to have made things work correctly once again. Not sure what effects this might have on other things though unfortunately.

I've come across a bug in my application when it is launched using the "Open" button on the Google Play Store app (previously called Android Market). It seems that launching it from the Play Store uses a different <code>Intent</code> than launching it from the phone's application menu of icons. This is leading to multiple copies of the same Activity being launched, which are conflicting with each other.

For example, if my app consists of the Activities A-B-C, then this issue can lead to a stack of A-B-C-A.

I tried using <code>android:launchMode="singleTask"</code> on all the Activities to fix this problem, but it has the unwanted side-effect of clearing the Activity stack to root, whenever I hit the HOME button. 

The expected behavior is: A-B-C -> HOME -> And when the app is restored, I need: A-B-C -> HOME -> A-B-C

Is there a good way to prevent launching multiple Activities of the same type, without resetting to the root activity when using the HOME button?

How to prevent multiple instances of an Activity when it is launched with different Intents

Android

Xamarin

Eclipse

我在我的应用程序中遇到了一个bug，当它使用Google Play Store应用程序(以前称为Android Market)上的“打开”按钮启动时。从Play Store启动它似乎使用了不同的Intent，而不是从手机的应用程序图标菜单启动它。这会导致启动同一活动的多个副本，这些副本彼此冲突。例如，如果我的应用程序由...

问如何防止活动以不同的意图启动时出现多个实例
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