How to Set a Custom Font in the ActionBar Title?

You can do this using a custom TypefaceSpan class. It's superior to the customView approach indicated above because it doesn't break when using other Action Bar elements like expanding action views.

The use of such a class would look something like this:

SpannableString s = new SpannableString("My Title");s.setSpan(new TypefaceSpan(this, "MyTypeface.otf"), 0, s.length(),        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);// Update the action bar title with the TypefaceSpan instanceActionBar actionBar = getActionBar();actionBar.setTitle(s);

The custom TypefaceSpan class is passed your Activity context and the name of a typeface in your assets/fonts directory. It loads the file and caches a new Typeface instance in memory. The complete implementation of TypefaceSpan is surprisingly simple:

/** * Style a {@link Spannable} with a custom {@link Typeface}. *  * @author Tristan Waddington */public class TypefaceSpan extends MetricAffectingSpan {      /** An <code>LruCache</code> for previously loaded typefaces. */    private static LruCache<String, Typeface> sTypefaceCache =            new LruCache<String, Typeface>(12);    private Typeface mTypeface;    /**     * Load the {@link Typeface} and apply to a {@link Spannable}.     */    public TypefaceSpan(Context context, String typefaceName) {        mTypeface = sTypefaceCache.get(typefaceName);        if (mTypeface == null) {            mTypeface = Typeface.createFromAsset(context.getApplicationContext()                    .getAssets(), String.format("fonts/%s", typefaceName));            // Cache the loaded Typeface            sTypefaceCache.put(typefaceName, mTypeface);        }    }    @Override    public void updateMeasureState(TextPaint p) {        p.setTypeface(mTypeface);        // Note: This flag is required for proper typeface rendering        p.setFlags(p.getFlags() | Paint.SUBPIXEL_TEXT_FLAG);    }    @Override    public void updateDrawState(TextPaint tp) {        tp.setTypeface(mTypeface);        // Note: This flag is required for proper typeface rendering        tp.setFlags(tp.getFlags() | Paint.SUBPIXEL_TEXT_FLAG);    }}

Simply copy the above class into your project and implement it in your activity's onCreate method as shown above.

I agree that this isn't completely supported, but here's what I did. You can use a custom view for your action bar (it will display between your icon and your action items). I'm using a custom view and I have the native title disabled. All of my activities inherit from a single activity, which has this code in onCreate:

this.getActionBar().setDisplayShowCustomEnabled(true);this.getActionBar().setDisplayShowTitleEnabled(false);LayoutInflater inflator = LayoutInflater.from(this);View v = inflator.inflate(R.layout.titleview, null);//if you need to customize anything else about the text, do it here.//I'm using a custom TextView with a custom font in my layout xml so all I need to do is set title((TextView)v.findViewById(R.id.title)).setText(this.getTitle());//assign the view to the actionbarthis.getActionBar().setCustomView(v);

And my layout xml (R.layout.titleview in the code above) looks like this:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@android:color/transparent" ><com.your.package.CustomTextView        android:id="@+id/title"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerVertical="true"            android:layout_marginLeft="10dp"            android:textSize="20dp"            android:maxLines="1"            android:ellipsize="end"            android:text="" /></RelativeLayout>

int titleId = getResources().getIdentifier("action_bar_title", "id",            "android");    TextView yourTextView = (TextView) findViewById(titleId);    yourTextView.setTextColor(getResources().getColor(R.color.black));    yourTextView.setTypeface(face);