blocks|key|269145|text|我自己想明白了。使用支持库v7，showAsAction应该放在一个自定义名称空间下，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|269146|<menu+xmlns:android="http://schemas.android.com/apk/res/android"
++++++xmlns:balloonberry="http://schemas.android.com/apk/res-auto">
++++<item+android:id="@%2Bid/menu_add_size"
++++++++android:title="@string/menu_add_item"
++++++++android:orderInCategory="10"
++++++++balloonberry:showAsAction="always"
++++++++android:icon="@android:drawable/ic_menu_add"+/>
</menu>|code-block|syntax|javascript|269147|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|$]]

Figured out myself. With the support library v7 the showAsAction should go under a custom namespace like this:

<pre><code>&lt;menu xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:balloonberry="http://schemas.android.com/apk/res-auto"&gt;
 &lt;item android:id="@+id/menu_add_size"
 android:title="@string/menu_add_item"
 android:orderInCategory="10"
 balloonberry:showAsAction="always"
 android:icon="@android:drawable/ic_menu_add" /&gt;
&lt;/menu&gt;
</code></pre>

blocks|key|269214|text|还要确保您有正确的命名空间路径。如果是错误的，它不会给你一个错误消息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|269215|我有|269216|<menu+xmlns:android="http://schemas.android.com/apk/res/android"
++++++xmlns:myapp="http://schemas.android.com/res-auto">|code-block|syntax|javascript|269217|而不是|269218|<menu+xmlns:android="http://schemas.android.com/apk/res/android"
++++++xmlns:myapp="http://schemas.android.com/apk/res-auto">|269219|我只知道它不起作用。不知道我是如何忘记路径的/apk部分的，但它确实发生了。没有错误消息，只有一个难以追踪的bug。|269220|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Also make sure that you have the correct path for the namespace. It will not give you an error message if it's wrong.

I had

<pre><code>&lt;menu xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:myapp="http://schemas.android.com/res-auto"&gt;
</code></pre>

instead of

<pre><code>&lt;menu xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:myapp="http://schemas.android.com/apk/res-auto"&gt;
</code></pre>

All I knew was that it wasn't working. Not sure how I managed to forget the /apk part of the path, but it happened. No error message, just an elusive bug to track down.

blocks|key|52812|text|还要确保在ActionBarActivity.onCreateOptionsMenu()方法中使用正确的充气器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|52813|正确的解决方案：|52814|MenuInflater+menuInflater+=+getMenuInflater();
menuInflater.inflate(R.menu.menu_example,+menu);|code-block|syntax|javascript|52815|错误的解决方案：|52816|MenuInflater+menuInflater+=+new+MenuInflater(this);
menuInflater.inflate(R.menu.menu_example,+menu);|52817|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Also make sure that you use correct inflater in ActionBarActivity.onCreateOptionsMenu() method.

Correct solution:

<pre><code>MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.menu_example, menu);
</code></pre>

Incorrect solution:

<pre><code>MenuInflater menuInflater = new MenuInflater(this);
menuInflater.inflate(R.menu.menu_example, menu);
</code></pre>

blocks|key|52845|text|得到了同样的问题，但在Android+5上。我有3个项目，但操作系统忽略了我的属性“总是”，只显示了2个项目。下面是我的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|52846|++@Override
public+void+onCreateOptionsMenu(Menu+menu,+MenuInflater+inflater)+{
++++Log.d(TAG,+"onCreateOptionsMenu()");
++++inflater.inflate(R.menu.your_menu,+menu);
++++for+(int+j+=+0;+j+<+menu.size();+j%2B%2B)+{
++++++++MenuItem+item+=+menu.getItem(j);
++++++++Log.d(TAG,+"set+flag+for+"+%2B+item.getTitle());
++++++++item.setShowAsActionFlags(MenuItem.SHOW_AS_ACTION_ALWAYS);
++++}
}|code-block|syntax|javascript|52847|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|$]]

Got the same problem, but on Android 5. I have 3 items but OS ignored my attribute "always" and showed only 2 items. Here my solution:

<pre><code> @Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 Log.d(TAG, "onCreateOptionsMenu()");
 inflater.inflate(R.menu.your_menu, menu);
 for (int j = 0; j &lt; menu.size(); j++) {
 MenuItem item = menu.getItem(j);
 Log.d(TAG, "set flag for " + item.getTitle());
 item.setShowAsActionFlags(MenuItem.SHOW_AS_ACTION_ALWAYS);
 }
}
</code></pre>

blocks|key|269361|text|<?xml+version="1.0"+encoding="utf-8"?>
<menu
++++xmlns:android="http://schemas.android.com/apk/res/android"
++++xmlns:app="http://schemas.android.com/apk/res-auto"
++++>
++++<item
++++++++android:id="@id/back"
++++++++android:icon="@drawable/back"
++++++++app:showAsAction="always"
++++++++android:title="@string/back"/>
++++<item
++++++++android:id="@id/save"
++++++++android:icon="@drawable/le_top_btn_icon_add"
++++++++app:showAsAction="ifRoom"
++++++++android:title="@string/save"/>
</menu>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|269362|不工作，supportLibraryVersion+=+'25.1.0‘compileSdkVersion+=+25|unstyled|269363|请参阅“警告”|269364|应该将app:showAsAction与带有xmlns:app="http://schemas.android.com/apk/res-auto“的appcompat库一起使用...(Ctrl%2BF1)|offset|length|269365|当使用appcompat库时，菜单资源应该引用app:名称空间中的showAsAction，而不是android:名称空间中的名称。|269366|类似地，当不使用appcompat库时，您应该使用android:showAsAction属性。|269367|我认为可以忽略这个警告。|269368|entityMap|0|LINK|mutability|MUTABLE|url|http://schemas.android.com/apk/res-auto^0|0|0|0|X|13|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|13|8|@]|9|@$K|14|L|15|1|16]]|A|$]]|$1|M|3|N|5|F|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|19|8|@]|9|@]|A|$]]|$1|S|3|-4|5|F|7|1A|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

<pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;menu
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 &gt;
 &lt;item
 android:id="@id/back"
 android:icon="@drawable/back"
 app:showAsAction="always"
 android:title="@string/back"/&gt;
 &lt;item
 android:id="@id/save"
 android:icon="@drawable/le_top_btn_icon_add"
 app:showAsAction="ifRoom"
 android:title="@string/save"/&gt;
&lt;/menu&gt;
</code></pre>

don't work,
 with supportLibraryVersion = '25.1.0' 
compileSdkVersion = 25 

see the "Warning" 

Should use app:showAsAction with the appcompat library with
xmlns:app="http://schemas.android.com/apk/res-auto" less... (Ctrl+F1) 

When using the appcompat library,menu resources should refer to the showAsAction in the app: namespace,
not the android: namespace. 

Similarly,when not using the appcompat library, 
you should be using the android:showAsAction attribute.

I think the warn can be ignore.

blocks|key|269421|text|这可能不是你的案子但我用的是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|269422|new+MenuInflater(this).inflate(R.menu.my_menu,+menu);|offset|length|style|CODE|269423|将其更改为|269424|getMenuInflater().inflate(R.menu.my_menu,+menu);|269425|解决了这个问题！|269426|entityMap^0|0|0|1H|0|0|0|1C|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|O|$]]

This might not be your case but I was using 

<code>new MenuInflater(this).inflate(R.menu.my_menu, menu);</code>

changing it to 

<code>getMenuInflater().inflate(R.menu.my_menu, menu);</code>

fixed the problem!

blocks|key|52992|text|将这样的自定义命名空间添加到showAsAction和actionViewClass：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|52993|<menu+xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item+android:id="@%2Bid/search"
++++android:title="@string/search"
++++android:icon="@drawable/ic_search"
++++app:showAsAction="collapseActionView%7CifRoom"
++++app:actionViewClass="android.widget.SearchView"+/>|code-block|syntax|javascript|52994|​|52995|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

add custom namespace like this to showAsAction and actionViewClass:

<pre><code>&lt;menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"&gt;
&lt;item android:id="@+id/search"
 android:title="@string/search"
 android:icon="@drawable/ic_search"
 app:showAsAction="collapseActionView|ifRoom"
 app:actionViewClass="android.widget.SearchView" /&gt;
</code></pre>

blocks|key|269501|text|最简单的方法是通过添加|type|unstyled|depth|inlineStyleRanges|entityRanges|data|269502|xmlns:app="http://schemas.android.com/apk/res-auto"|code-block|syntax|javascript|269503|并更改此代码|269504|android:showAsAction="always"|269505|至|269506|app:showAsAction="always"|269507|最后|269508|<menu+xmlns:android="http://schemas.android.com/apk/res/android"
++++xmlns:app="http://schemas.android.com/apk/res-auto">
++++<item+android:id="@%2Bid/menu_add_size"
++++++++android:title="@string/menu_add_item"
++++++++android:orderInCategory="10"
++++++++app:showAsAction="always"
++++++++android:icon="@android:drawable/ic_menu_add"+/>
</menu>|269509|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

The simplest way is
Modify your code by adding 

<pre><code>xmlns:app="http://schemas.android.com/apk/res-auto"
</code></pre>

and change this code

<pre><code>android:showAsAction="always"
</code></pre>

to

<pre><code>app:showAsAction="always"
</code></pre>

and finally

<pre><code>&lt;menu xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"&gt;
 &lt;item android:id="@+id/menu_add_size"
 android:title="@string/menu_add_item"
 android:orderInCategory="10"
 app:showAsAction="always"
 android:icon="@android:drawable/ic_menu_add" /&gt;
&lt;/menu&gt;
</code></pre>

I'm using the new v7 appcompat library available starting from Android 4.3 (API level 18).

Regardless of what is specified in showAsAction for a menu item, it's not shown - it always creates the overflow menu icon, and puts even a single menu item under the menu.

Trying to add menu to an activity like this:

<pre><code>@Override
public boolean onCreateOptionsMenu(Menu menu) {
 getMenuInflater().inflate(R.menu.menu_sizes, menu);
 return true;
}
</code></pre>

And here's my menu xml:

<pre><code>&lt;menu xmlns:android="http://schemas.android.com/apk/res/android"&gt;
 &lt;item android:id="@+id/menu_add_size"
 android:title="@string/menu_add_item"
 android:orderInCategory="10"
 android:showAsAction="always"
 android:icon="@android:drawable/ic_menu_add" /&gt;
&lt;/menu&gt;
</code></pre>

Is it a bug of the new support library v7, or just something wrong with the code?
I've been using the similar code with ActionBarSherlock many times before.

Android 4.3 menu item showAsAction="always" ignored

Android

我使用的是从Android4.3(API18级)开始提供的新的v7 appcompat库。无论在showAsAction中为菜单项指定了什么，它都不会显示-它总是创建溢出菜单图标，并将一个菜单项放在菜单下。尝试将菜单添加到活动中，如下所示：@Overridepublic boolean onCreateOptionsM...

问Android4.3菜单项showAsAction=“总是”被忽略
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