How to show overflow menu in action bar

Question

I want to display an overflow menu in the action bar , I tried to use a menu in my activity but I'm only getting a popup menu when I click on the menu button on my phone. Is there any way to force that overflow menu for phone with physical buttons ?

Here is my menu file :

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item 
        android:id="@+id/phone"
        android:title="phone"
        android:icon="@drawable/phone"
        android:showAsAction="ifRoom"/>

    <item 
        android:id="@+id/computer"
        android:title="computer"
        android:icon="@drawable/computer"
        android:showAsAction="ifRoom"/>

    <item 
        android:id="@+id/gamepad"
        android:title="gamepad"
        android:icon="@drawable/gamepad"
        android:showAsAction="ifRoom"/>


</menu>

Answer 1

You need to go into the menu xml file and make sure it has

 android:showAsAction="ifRoom"

and for the icon you use

android:icon="@drawable/yourIcon"

Edit: To make sure you are using the right menu xml, check your activity class that is being run and look for the

onCreateOptionsMenu(Menu menu)

Once you have found that check that the line

getMenuInflater().inflate(R.menu.{0}, menu);

matches your menu xml file, where {0} = your xml file name