Q:

How do I change the android actionbar title and icon

I'm trying to do some things on the ActionBar in Android.
I've already added new items in the right side of the action bar.
How can I change the left side of the action bar? I want to change the icon and the text, and I want to add a "Back Button" in the action bar for the other screens

A:

This is very simple to accomplish
If you want to change it in code, call:
setTitle("My new title");
getActionBar().setIcon(R.drawable.my_icon);

And set the values to whatever you please.
Or, in the Android manifest XML file:
<activity android:name=".MyActivity" 
       android:icon="@drawable/my_icon" 
       android:label="My new title" />  

To enable the back button in your app use:
 getActionBar().setHomeButtonEnabled(true);
 getActionBar().setDisplayHomeAsUpEnabled(true);

The code should all be placed in your onCreate so that the label/icon changing is transparent to the user, but in reality it can be called anywhere during the activity's lifecycle.

A:

To make a single icon be usable by all your action bars you can do this in your Android Manifest.
<application
    android:logo="@drawable/Image">

    ...

</application>

A:

You just need to add these 3 lines of code. Replace the icon with your own icon. If you want to generate icons use this
getSupportActionBar().setHomeAsUpIndicator(R.drawable.icon_back_arrow);
getActionBar().setHomeButtonEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);

