why `ifroom` does not work - android studio -


hi there try set ifroom in menu item. can see in code try possible senario (please see each showasaction item

<menu xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools" tools:context=".mainactivity">      <item         android:id="@+id/action_forward"          android:title="forward"         android:icon="@drawable/ic_action_arrow_forward"         android:showasaction="ifroom"         ></item>       <item         android:id="@+id/action_zoom_in"         android:title="zoom in"         android:icon="@drawable/ic_action_zoom_in"         android:showasaction="ifroom|withtext"         ></item>        <item         android:id="@+id/action_home"         android:title="home"         android:icon="@drawable/ic_action_home"         app:showasaction="ifroom|withtext"         ></item>       <item         android:id="@+id/action_refresh"         android:title="refresh"         android:icon="@drawable/ic_action_refresh"         app:showasaction="ifroom"         ></item>      <item         android:id="@+id/action_zoom_out"         android:title="zoom out"         android:icon="@drawable/ic_action_zoom_out"         showasaction="ifroom"         ></item>      <item         android:id="@+id/action_back"         android:title="back"         android:icon="@drawable/ic_action_arrow_back"         app:showasaction="always"         ></item> </menu>

but show action_back , action_home in main page.

i noob in android studio think error related width of menu. (it not 100% width)

please see main_activity.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     tools:context=".mainactivity">       <include         android:id="@+id/tool_bar_bottom"         layout="@layout/tool_bar_bottom"         android:layout_height="wrap_content"         android:layout_width="match_parent"         android:layout_gravity="center" />  </linearlayout>

and tool_bar_bottom.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.toolbar     android:layout_height="wrap_content"     android:layout_width="match_parent"     android:background="@color/colorprimary"     android:elevation="2dp"     android:theme="@style/base.themeoverlay.appcompat.dark"     xmlns:android="http://schemas.android.com/apk/res/android" />

i think structure true , values of layout_width match_parent why ifroom not work me?

android show menu if set "showasaction" attribute "always". if set "ifroom", displayed if actionbar has room display menu item, else display overflow icon.

in case, seeing "action_back" because has "always". "action_home" becuase there room 1 icon , first item has "app:showasaction" attribute. others have "android:showasaction" attribute. more explanation on behaviour below.

if app using support library compatibility on versions low android 2.1, showasaction attribute not available android: namespace. instead attribute provided support library , must define own xml namespace , use namespace attribute prefix. (a custom xml namespace should based on app name, can name want , accessible within scope of file in declare it.)


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