blocks|key|3289963|text|目前我正在做一个涉及fragments+Unity3d的安卓项目，看起来我也遇到了类似的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3289964|据我所知，这不是fragments的错--是Unity做了一些有趣的事情，比如截取back按钮按下事件。我所做的是覆盖下面的方法，以确定按下back按钮时发生了什么：|3289965|@Override
public+void+onBackPressed()+{

++++Log.e("Test",+"onBackPressed+here");
}

@Override
public+boolean+onKeyDown(int+keyCode,+KeyEvent+event)+{

++++Log.e("Test",+"onKeyDown+here");

++++if+(keyCode+==+KeyEvent.KEYCODE_BACK)+{

++++Log.e("Test",+"onKeyDown+was+back+button");
++++}

++++return+super.onKeyDown(keyCode,+event);
}|code-block|syntax|javascript|3289966|我发现的问题是，当我按下back按钮时，有时不会出现日志消息--也就是说，它实际上并没有注册。起初，我认为这与我在onResume()方法中调用UnityPlayer.pause()有关，但当我今天早上再次运行该项目时，发现问题仍然存在，而且是间歇性的。|3289967|如果我想出一个解决方案，我会在这个帖子中编辑我的帖子。我希望这个解释至少能有所帮助。|3289968|3289969|编辑：|3289970|看看这个链接：Can't+pass+back+event+from+Unity+to+android+library+jar。有一个解决方案，你可以在你的Unity项目中实现，以帮助后退按钮按下处理。|offset|length|3289971|我这样做了，然后执行了一些进一步的测试，当UnityPlayer对象为而不是+paused时，似乎调用了onBackPressed()方法。这让我相信，只有当你的应用程序被放到后台时，才应该使用UnityPlayer.pause()方法，而不是当你在给定的时间根本不需要Unity模型的时候。|style|BOLD|CODE|3289972|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/21206615/cant-pass-back-event-from-unity-to-android-library-jar^0|0|0|0|0|0|0|0|7|1J|0|0|Z|3|1G|F|2P|J|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|19|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1C|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1D|8|@]|9|@$R|1E|S|1F|1|1G]]|A|$]]|$1|T|3|U|5|6|7|1H|8|@$R|1I|S|1J|V|W]|$R|1K|S|1L|V|X]|$R|1M|S|1N|V|X]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

I'm working on an Android project involving fragments Unity3d at the moment and it seems I've got a similar problem.

As far as I know, it's not fragments' fault - it's Unity that does something funny like intercept the back button press events. What I did was override the below methods to determine what's going on when a back button is pressed:

<pre><code>@Override
public void onBackPressed() {

 Log.e("Test", "onBackPressed here");
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

 Log.e("Test", "onKeyDown here");

 if (keyCode == KeyEvent.KEYCODE_BACK) {

 Log.e("Test", "onKeyDown was back button");
 }

 return super.onKeyDown(keyCode, event);
}
</code></pre>

The problem I discovered is that sometimes no log messages appear when I press the back button - i.e. it's not actually registered. At first I thought it had something to do with my calling UnityPlayer.pause() in the onResume() method but when I ran the project again this morning it turned out that the problem persists, AND it's intermittent.

If I come up with a solution I'll edit my post in this thread. I hope the explanation was at least of some help.

<hr>

Edit: 

Have a look at this link: <a href="https://stackoverflow.com/questions/21206615/cant-pass-back-event-from-unity-to-android-library-jar">Can&#39;t pass back event from Unity to android library jar</a>. There's a solution there that you can implement in your Unity project to help with the back button press handling.

I did that and then carried out some more testing and it looks like the <code>onBackPressed()</code> method gets called all right when the UnityPlayer object is NOT paused. This leads me to believe that the <code>UnityPlayer.pause()</code> method should only be used when your app is going put in the background, not when you simply aren't needing the Unity model at the given time.

blocks|key|5401011|text|当你在unity活动中回压时，整个过程将被终止。因此，当您通过android+activity启动unity活动时，请在不同的流程中启动unity活动。你可以通过在项目的android清单文件中声明它来做到这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5401012|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

When you back press in unity activity the whole process will be killed. Therefore when you are starting a unity activity through android activity , start unity activity in different process. You can do this by declaring this in android manifest file of project.

blocks|key|5401046|text|您应该在AndroidManifest.xml中为UnityActivity.java添加下面几行代码：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|5401047|++++<activity
++++++++android:name=".ui.activities.UnityPlayerActivity"
++++++++android:label="@string/app_name"
++++++++android:launchMode="singleTask"++<--+THIS
++++++++android:process=":unityplayer"+++<--+AND+THIS
++++++++...++++
++++>
++++++++...
++++</activity>|code-block|syntax|javascript|5401048|它将像另一个进程一样运行UnityActivity，Unity命令:+Application.quit()；将只关闭Unity进程。|5401049|此外，如果这还不够，您可以将这些行添加到启动UnityActivyty的活动中。但是要小心，另一个包活动通常会提供它自己的sharedPreferences和其他一些东西。|5401050|entityMap^0|4|J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|V|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

You should add in AndroidManifest.xml next lines of code for UnityActivity.java:

<pre><code> &lt;activity
 android:name=".ui.activities.UnityPlayerActivity"
 android:label="@string/app_name"
 android:launchMode="singleTask" &lt;-- THIS
 android:process=":unityplayer" &lt;-- AND THIS
 ... 
 &gt;
 ...
 &lt;/activity&gt;
</code></pre>

It's will run UnityActivity like another process and Unity command: Application.quit(); Will close only Unity Process.

Also if it will be not enough you can add those lines to activity that start UnityActivyty. But be careful, another package activity will most provide its own sharedPreferences and some other stuff.

blocks|key|5401060|text|//只需在Unity模块清单中添加以下两行代码即可。在UnityPlayerActivity下|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5401061|++++++++android:launchMode="singleTask"
++++++++android:process=":unityplayer"|code-block|syntax|javascript|5401062|和Unity+back按钮单击事件将此添加到代码Application.quit()下；|5401063|它完美地为我工作|5401064|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]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

// Just add below two line code In your Unity module manifast. 
under UnityPlayerActivity

<pre><code> android:launchMode="singleTask"
 android:process=":unityplayer"
</code></pre>

And Unity back button click event add this below code 
Application.quit(); 

Its working for me perfectly

blocks|key|5401079|text|将以下内容添加到清单文件后：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5401080|android:launchMode="singleTask"
++++android:process=":unityplayer"|code-block|syntax|javascript|5401081|还要确保在UnityPlayerActivity中像这样修改以下方法：|5401082|++++@Override+public+boolean+onKeyDown(int+keyCode,+KeyEvent+event)+++{
++++if+((keyCode+==+KeyEvent.KEYCODE_BACK))+{
++++++++onBackPressed();
++++}return+mUnityPlayer.injectEvent(event);
++++}|5401083|您可以在onBackPressed()中添加自己的代码。|5401084|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

After adding the following to your Manifest file: 

<pre><code>android:launchMode="singleTask"
 android:process=":unityplayer"
</code></pre>

Also make sure you modify the following method in UnityPlayerActivity like this:

<pre><code> @Override public boolean onKeyDown(int keyCode, KeyEvent event) {
 if ((keyCode == KeyEvent.KEYCODE_BACK)) {
 onBackPressed();
 }return mUnityPlayer.injectEvent(event);
 }
</code></pre>

You can add your own code in onBackPressed().

I have the same problem as mentioned in this topic <a href="https://stackoverflow.com/questions/7754373/integrating-unity-with-eclipse-back-button-click">Integrating Unity with Eclipse: Back Button Click</a> but the suggested solutions didn't work.

I have a Unity Player embedded in a Native Android Application. I can start the Unity Player without a problem but now I want to go back to my previous activity with the back button. I already tried Application.Quit from Unity side and finish() from android side, both closes the whole application. I also tried to start a new Activity from the Unity context but this doesn't work either, I think this is because I work with fragments. My Activity setup is as follows:

MainActivity where several fragments are embedded. Two of them contain Lists from which I can start a new Activity which shows me detail views of the List elements. The detail views are also fragments in which you can swipe left and right to previous/next element (similar to gmail app). From within the detail view, you can start Unity to have some augmentations with the qualcomm vuforia framework.

up to this point everything works, but I can not go back from the UnityPlayer to the details view.

Does anyone have any idea how to achieve this?

Thanks!

How to return from Unity Player to previous running Android Activity?

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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问如何从Unity Player返回到之前运行的Android活动？
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