Set icon and background of ActionBar

Android programming example to set icon and background of ActionBar. (Assume your activity extends android.support.v7.app.ActionBarActivity, with android.support.v7.app.ActionBar)

package com.example.androidactionbartitle;

import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.content.res.Resources;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;

public class MainActivity extends ActionBarActivity {
 
 Button btn1, btn2, btn3, btn4, btn5;;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        btn1 = (Button)findViewById(R.id.button1);
        btn2 = (Button)findViewById(R.id.button2);
        btn3 = (Button)findViewById(R.id.button3);
        btn4 = (Button)findViewById(R.id.button4);
        btn5 = (Button)findViewById(R.id.button5);

        btn1.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    ActionBar actionBar = getSupportActionBar();
    
    Drawable drawable;
    Resources resources = getResources();
    
    //deprecated in API level 22
    //drawable = resources.getDrawable(R.drawable.ic_launcher);
    
    //API Level 21
    drawable = resources.getDrawable(R.drawable.ic_launcher, null);
    
    actionBar.setBackgroundDrawable(drawable);
   }});
        
        btn2.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    ActionBar actionBar = getSupportActionBar();
    
    Drawable drawable;
    drawable = new ColorDrawable(0xA0500050);
    
    actionBar.setBackgroundDrawable(drawable);
   }});
        
        btn3.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    ActionBar actionBar = getSupportActionBar();
    actionBar.setBackgroundDrawable(null);
   }});
        
        btn4.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    ActionBar actionBar = getSupportActionBar();
    
    Drawable drawable;
    Resources resources = getResources();
    
    //deprecated in API level 22
    //drawable = resources.getDrawable(R.drawable.ic_launcher);
    
    //API Level 21
    drawable = resources.getDrawable(R.drawable.ic_launcher, null);
    
    actionBar.setIcon(drawable);
    actionBar.setDisplayShowHomeEnabled(true);
   }});
        
        btn5.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    //enable display HOME, but with icon of null
    ActionBar actionBar = getSupportActionBar();
    actionBar.setIcon(null);
    actionBar.setDisplayShowHomeEnabled(true);
   }});
    }

}

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.androidactionbartitle.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />
    
    <Button 
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button 1 (background - drawable icon)"/>
    
    <Button 
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button 2 (background - color)"/>
    
    <Button 
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button 3 (background - null)"/>
    
    <Button 
        android:id="@+id/button4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button 4 (set icon)"/>
    
    <Button 
        android:id="@+id/button5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button 5 (set icon null)"/>

</LinearLayout>