android - How to change ActionBar title style programmatically

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#edebeb"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Change ActionBar Title Style"         android:layout_marginTop="10dp"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.graphics.Color; import android.graphics.Typeface; import android.graphics.drawable.ColorDrawable; import android.os.Bundle; import android.app.Activity; import android.util.TypedValue; import android.view.Gravity; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.RelativeLayout.LayoutParams; import android.app.ActionBar; import android.widget.TextView;   public class MainActivity extends Activity {       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         tamat Button btn = (Button) findViewById(R.id.btn);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 // Get the ActionBar                 ActionBar ab = getActionBar();                  // Set the ActionBar background color                 ab.setBackgroundDrawable(new ColorDrawable(Color.RED));                  // Create a TextView programmatically.                 TextView tv = new TextView(getApplicationContext());                  // Create a LayoutParams for TextView                 LayoutParams lp = new RelativeLayout.LayoutParams(                         LayoutParams.MATCH_PARENT, // Width of TextView                         LayoutParams.WRAP_CONTENT); // Height of TextView                  // Apply the layout parameters to TextView widget                 tv.setLayoutParams(lp);                  // Set text to display in TextView                 tv.setText("Android Example : Change ActionBar Title Style");                  // Set the text color of TextView                 tv.setTextColor(Color.YELLOW);                  // Center align the ActionBar title                 tv.setGravity(Gravity.CENTER);                  // Set the serif font for TextView text                 // This will change ActionBar title text font                 tv.setTypeface(Typeface.SERIF, Typeface.ITALIC);                  // Set the ActionBar title font size                 tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP,13);                  // Set the ActionBar display option                 ab.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);                  // Finally, set the newly created TextView as ActionBar custom view                 ab.setCustomView(tv);             }         });     } }
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