How to add button in ActionBar(Android)?

Question

I want to add a Button to the Action Bar to the right hand side of Example as in this screen shot:

I get actionBar in onCreate method as:

ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);

and back button(onOptionsItemSelected method) as below:

public boolean onOptionsItemSelected(MenuItem item){
    Intent myIntent = new Intent(getApplicationContext(),MainActivity.class);
    startActivityForResult(myIntent, 0);
    return true;
}

How can I add button?

Answer 1

you have to create an entry inside res/menu,override onCreateOptionsMenu and inflate it

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.yourentry, menu);
    return true;
}

an entry for the menu could be:

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:id="@+id/action_cart"
        android:icon="@drawable/cart"
        android:orderInCategory="100"
        android:showAsAction="always"/> 
</menu>